internal/build: parse buildbot tag better

internal/build: clarify term refspec
build: enable archives on buildbot-testing
2022-05-20 19:59:26 +02:00 · 2022-05-20 19:45:45 +02:00 · 2022-05-20 19:12:42 +02:00 · 2022-05-20 18:55:01 +02:00 · 2022-05-20 17:25:17 +02:00 · 2022-05-20 17:19:22 +02:00
895 changed files with 185205 additions and 168810 deletions
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -10,11 +10,12 @@ consensus                       @karalabe
 core/                           @karalabe @holiman @rjl493456442
 eth/                            @karalabe @holiman @rjl493456442
 eth/catalyst/                   @gballet
-graphql/                        @gballet
+eth/tracers/                    @s1na
+graphql/                        @gballet @s1na
 les/                            @zsfelfoldi @rjl493456442
 light/                          @zsfelfoldi @rjl493456442
 mobile/                         @karalabe @ligi
-node/                           @fjl @renaynay
+node/                           @fjl
 p2p/                            @fjl @zsfelfoldi
 rpc/                            @fjl @holiman
 p2p/simulations                 @fjl
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,8 @@
 [submodule "tests"]
 	path = tests/testdata
 	url = https://github.com/ethereum/tests
+	shallow = true
+[submodule "evm-benchmarks"]
+	path = tests/evm-benchmarks
+	url = https://github.com/ipsilon/evm-benchmarks
+	shallow = true
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -1,7 +1,7 @@
 # This file configures github.com/golangci/golangci-lint.

 run:
-  timeout: 3m
+  timeout: 20m
  tests: true
  # default is true. Enables skipping of directories:
  #   vendor$, third_party$, testdata$, examples$, Godeps$, builtin$
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ jobs:
  allow_failures:
    - stage: build
      os: osx
-      go: 1.15.x
+      go: 1.17.x
      env:
        - azure-osx
        - azure-ios
@@ -16,7 +16,7 @@ jobs:
    - stage: lint
      os: linux
      dist: bionic
-      go: 1.16.x
+      go: 1.18.x
      env:
        - lint
      git:
@@ -24,12 +24,48 @@ jobs:
      script:
        - go run build/ci.go lint

+    # These builders create the Docker sub-images for multi-arch push and each
+    # will attempt to push the multi-arch image if they are the last builder
+    - stage: build
+      if: type = push
+      os: linux
+      arch: amd64
+      dist: bionic
+      go: 1.18.x
+      env:
+        - docker
+      services:
+        - docker
+      git:
+        submodules: false # avoid cloning ethereum/tests
+      before_install:
+        - export DOCKER_CLI_EXPERIMENTAL=enabled
+      script:
+        - go run build/ci.go docker -image -manifest amd64,arm64 -upload ethereum/client-go
+
+    - stage: build
+      if: type = push
+      os: linux
+      arch: arm64
+      dist: bionic
+      go: 1.18.x
+      env:
+        - docker
+      services:
+        - docker
+      git:
+        submodules: false # avoid cloning ethereum/tests
+      before_install:
+        - export DOCKER_CLI_EXPERIMENTAL=enabled
+      script:
+        - go run build/ci.go docker -image -manifest amd64,arm64 -upload ethereum/client-go
+
    # This builder does the Ubuntu PPA upload
    - stage: build
      if: type = push
      os: linux
      dist: bionic
-      go: 1.16.x
+      go: 1.18.x
      env:
        - ubuntu-ppa
        - GO111MODULE=on
@@ -54,7 +90,7 @@ jobs:
      os: linux
      dist: bionic
      sudo: required
-      go: 1.16.x
+      go: 1.18.x
      env:
        - azure-linux
        - GO111MODULE=on
@@ -84,36 +120,6 @@ jobs:
        - go run build/ci.go install -dlgo -arch arm64 -cc aarch64-linux-gnu-gcc
        - go run build/ci.go archive -arch arm64 -type tar -signer LINUX_SIGNING_KEY -signify SIGNIFY_KEY -upload gethstore/builds

-    # This builder does the Linux Azure MIPS xgo uploads
-    - stage: build
-      if: type = push
-      os: linux
-      dist: bionic
-      services:
-        - docker
-      go: 1.16.x
-      env:
-        - azure-linux-mips
-        - GO111MODULE=on
-      git:
-        submodules: false # avoid cloning ethereum/tests
-      script:
-        - go run build/ci.go xgo --alltools -- --targets=linux/mips --ldflags '-extldflags "-static"' -v
-        - for bin in build/bin/*-linux-mips; do mv -f "${bin}" "${bin/-linux-mips/}"; done
-        - go run build/ci.go archive -arch mips -type tar -signer LINUX_SIGNING_KEY -signify SIGNIFY_KEY -upload gethstore/builds
-
-        - go run build/ci.go xgo --alltools -- --targets=linux/mipsle --ldflags '-extldflags "-static"' -v
-        - for bin in build/bin/*-linux-mipsle; do mv -f "${bin}" "${bin/-linux-mipsle/}"; done
-        - go run build/ci.go archive -arch mipsle -type tar -signer LINUX_SIGNING_KEY -signify SIGNIFY_KEY -upload gethstore/builds
-
-        - go run build/ci.go xgo --alltools -- --targets=linux/mips64 --ldflags '-extldflags "-static"' -v
-        - for bin in build/bin/*-linux-mips64; do mv -f "${bin}" "${bin/-linux-mips64/}"; done
-        - go run build/ci.go archive -arch mips64 -type tar -signer LINUX_SIGNING_KEY signify SIGNIFY_KEY -upload gethstore/builds
-
-        - go run build/ci.go xgo --alltools -- --targets=linux/mips64le --ldflags '-extldflags "-static"' -v
-        - for bin in build/bin/*-linux-mips64le; do mv -f "${bin}" "${bin/-linux-mips64le/}"; done
-        - go run build/ci.go archive -arch mips64le -type tar -signer LINUX_SIGNING_KEY -signify SIGNIFY_KEY -upload gethstore/builds
-
    # This builder does the Android Maven and Azure uploads
    - stage: build
      if: type = push
@@ -142,7 +148,7 @@ jobs:
        - sdkmanager "platform-tools" "platforms;android-15" "platforms;android-19" "platforms;android-24" "ndk-bundle"

        # Install Go to allow building with
-        - curl https://dl.google.com/go/go1.16.linux-amd64.tar.gz | tar -xz
+        - curl https://dl.google.com/go/go1.18.linux-amd64.tar.gz | tar -xz
        - export PATH=`pwd`/go/bin:$PATH
        - export GOROOT=`pwd`/go
        - export GOPATH=$HOME/go
@@ -156,7 +162,7 @@ jobs:
    - stage: build
      if: type = push
      os: osx
-      go: 1.16.x
+      go: 1.18.x
      env:
        - azure-osx
        - azure-ios
@@ -188,7 +194,7 @@ jobs:
      os: linux
      arch: amd64
      dist: bionic
-      go: 1.16.x
+      go: 1.18.x
      env:
        - GO111MODULE=on
      script:
@@ -199,7 +205,7 @@ jobs:
      os: linux
      arch: arm64
      dist: bionic
-      go: 1.16.x
+      go: 1.18.x
      env:
        - GO111MODULE=on
      script:
@@ -208,7 +214,7 @@ jobs:
    - stage: build
      os: linux
      dist: bionic
-      go: 1.15.x
+      go: 1.17.x
      env:
        - GO111MODULE=on
      script:
@@ -219,7 +225,7 @@ jobs:
      if: type = cron
      os: linux
      dist: bionic
-      go: 1.16.x
+      go: 1.18.x
      env:
        - azure-purge
        - GO111MODULE=on
@@ -227,3 +233,15 @@ jobs:
        submodules: false # avoid cloning ethereum/tests
      script:
        - go run build/ci.go purge -store gethstore/builds -days 14
+
+    # This builder executes race tests
+    - stage: build
+      if: type = cron
+      os: linux
+      dist: bionic
+      go: 1.18.x
+      env:
+        - GO111MODULE=on
+      script:
+        - go run build/ci.go test  -race -coverage $TEST_PACKAGES
+
--- a/25
+++ b/25
@@ -1,10 +1,20 @@
-# Build Geth in a stock Go builder container
-FROM golang:1.16-alpine as builder
+# Support setting various labels on the final image
+ARG COMMIT=""
+ARG VERSION=""
+ARG BUILDNUM=""

-RUN apk add --no-cache make gcc musl-dev linux-headers git
+# Build Geth in a stock Go builder container
+FROM golang:1.18-alpine as builder
+
+RUN apk add --no-cache gcc musl-dev linux-headers git
+
+# Get dependencies - will also be cached if we won't change go.mod/go.sum
+COPY go.mod /go-ethereum/
+COPY go.sum /go-ethereum/
+RUN cd /go-ethereum && go mod download

 ADD . /go-ethereum
-RUN cd /go-ethereum && make geth
+RUN cd /go-ethereum && go run build/ci.go install ./cmd/geth

 # Pull Geth into a second stage deploy alpine container
 FROM alpine:latest
@@ -14,3 +24,10 @@ COPY --from=builder /go-ethereum/build/bin/geth /usr/local/bin/

 EXPOSE 8545 8546 30303 30303/udp
 ENTRYPOINT ["geth"]
+
+# Add some metadata labels to help programatic image consumption
+ARG COMMIT=""
+ARG VERSION=""
+ARG BUILDNUM=""
+
+LABEL commit="$COMMIT" version="$VERSION" buildnum="$BUILDNUM"
--- a/Dockerfile.alltools
+++ b/Dockerfile.alltools
@@ -1,10 +1,20 @@
-# Build Geth in a stock Go builder container
-FROM golang:1.16-alpine as builder
+# Support setting various labels on the final image
+ARG COMMIT=""
+ARG VERSION=""
+ARG BUILDNUM=""

-RUN apk add --no-cache make gcc musl-dev linux-headers git
+# Build Geth in a stock Go builder container
+FROM golang:1.18-alpine as builder
+
+RUN apk add --no-cache gcc musl-dev linux-headers git
+
+# Get dependencies - will also be cached if we won't change go.mod/go.sum
+COPY go.mod /go-ethereum/
+COPY go.sum /go-ethereum/
+RUN cd /go-ethereum && go mod download

 ADD . /go-ethereum
-RUN cd /go-ethereum && make all
+RUN cd /go-ethereum && go run build/ci.go install

 # Pull all binaries into a second stage deploy alpine container
 FROM alpine:latest
@@ -13,3 +23,10 @@ RUN apk add --no-cache ca-certificates
 COPY --from=builder /go-ethereum/build/bin/* /usr/local/bin/

 EXPOSE 8545 8546 30303 30303/udp
+
+# Add some metadata labels to help programatic image consumption
+ARG COMMIT=""
+ARG VERSION=""
+ARG BUILDNUM=""
+
+LABEL commit="$COMMIT" version="$VERSION" buildnum="$BUILDNUM"
--- a/99
+++ b/99
@@ -2,11 +2,7 @@
 # with Go source code. If you know what GOPATH is then you probably
 # don't need to bother with make.

-.PHONY: geth android ios geth-cross evm all test clean
-.PHONY: geth-linux geth-linux-386 geth-linux-amd64 geth-linux-mips64 geth-linux-mips64le
-.PHONY: geth-linux-arm geth-linux-arm-5 geth-linux-arm-6 geth-linux-arm-7 geth-linux-arm64
-.PHONY: geth-darwin geth-darwin-386 geth-darwin-amd64
-.PHONY: geth-windows geth-windows-386 geth-windows-amd64
+.PHONY: geth android ios evm all test clean

 GOBIN = ./build/bin
 GO ?= latest
@@ -47,101 +43,8 @@ clean:

 devtools:
 	env GOBIN= go install golang.org/x/tools/cmd/stringer@latest
-	env GOBIN= go install github.com/kevinburke/go-bindata/go-bindata@latest
 	env GOBIN= go install github.com/fjl/gencodec@latest
 	env GOBIN= go install github.com/golang/protobuf/protoc-gen-go@latest
 	env GOBIN= go install ./cmd/abigen
 	@type "solc" 2> /dev/null || echo 'Please install solc'
 	@type "protoc" 2> /dev/null || echo 'Please install protoc'
-
-# Cross Compilation Targets (xgo)
-
-geth-cross: geth-linux geth-darwin geth-windows geth-android geth-ios
-	@echo "Full cross compilation done:"
-	@ls -ld $(GOBIN)/geth-*
-
-geth-linux: geth-linux-386 geth-linux-amd64 geth-linux-arm geth-linux-mips64 geth-linux-mips64le
-	@echo "Linux cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-*
-
-geth-linux-386:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/386 -v ./cmd/geth
-	@echo "Linux 386 cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-* | grep 386
-
-geth-linux-amd64:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/amd64 -v ./cmd/geth
-	@echo "Linux amd64 cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-* | grep amd64
-
-geth-linux-arm: geth-linux-arm-5 geth-linux-arm-6 geth-linux-arm-7 geth-linux-arm64
-	@echo "Linux ARM cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-* | grep arm
-
-geth-linux-arm-5:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-5 -v ./cmd/geth
-	@echo "Linux ARMv5 cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-* | grep arm-5
-
-geth-linux-arm-6:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-6 -v ./cmd/geth
-	@echo "Linux ARMv6 cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-* | grep arm-6
-
-geth-linux-arm-7:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-7 -v ./cmd/geth
-	@echo "Linux ARMv7 cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-* | grep arm-7
-
-geth-linux-arm64:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm64 -v ./cmd/geth
-	@echo "Linux ARM64 cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-* | grep arm64
-
-geth-linux-mips:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips --ldflags '-extldflags "-static"' -v ./cmd/geth
-	@echo "Linux MIPS cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-* | grep mips
-
-geth-linux-mipsle:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mipsle --ldflags '-extldflags "-static"' -v ./cmd/geth
-	@echo "Linux MIPSle cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-* | grep mipsle
-
-geth-linux-mips64:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips64 --ldflags '-extldflags "-static"' -v ./cmd/geth
-	@echo "Linux MIPS64 cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-* | grep mips64
-
-geth-linux-mips64le:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips64le --ldflags '-extldflags "-static"' -v ./cmd/geth
-	@echo "Linux MIPS64le cross compilation done:"
-	@ls -ld $(GOBIN)/geth-linux-* | grep mips64le
-
-geth-darwin: geth-darwin-386 geth-darwin-amd64
-	@echo "Darwin cross compilation done:"
-	@ls -ld $(GOBIN)/geth-darwin-*
-
-geth-darwin-386:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=darwin/386 -v ./cmd/geth
-	@echo "Darwin 386 cross compilation done:"
-	@ls -ld $(GOBIN)/geth-darwin-* | grep 386
-
-geth-darwin-amd64:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=darwin/amd64 -v ./cmd/geth
-	@echo "Darwin amd64 cross compilation done:"
-	@ls -ld $(GOBIN)/geth-darwin-* | grep amd64
-
-geth-windows: geth-windows-386 geth-windows-amd64
-	@echo "Windows cross compilation done:"
-	@ls -ld $(GOBIN)/geth-windows-*
-
-geth-windows-386:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=windows/386 -v ./cmd/geth
-	@echo "Windows 386 cross compilation done:"
-	@ls -ld $(GOBIN)/geth-windows-* | grep 386
-
-geth-windows-amd64:
-	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=windows/amd64 -v ./cmd/geth
-	@echo "Windows amd64 cross compilation done:"
-	@ls -ld $(GOBIN)/geth-windows-* | grep amd64
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ archives are published at https://geth.ethereum.org/downloads/.

 For prerequisites and detailed build instructions please read the [Installation Instructions](https://geth.ethereum.org/docs/install-and-build/installing-geth).

-Building `geth` requires both a Go (version 1.14 or later) and a C compiler. You can install
+Building `geth` requires both a Go (version 1.16 or later) and a C compiler. You can install
 them using your favourite package manager. Once the dependencies are installed, run

 ```shell
@@ -52,23 +52,39 @@ Going through all the possible command line flags is out of scope here (please c
 but we've enumerated a few common parameter combos to get you up to speed quickly
 on how you can run your own `geth` instance.

+### Hardware Requirements
+
+Minimum:
+
+* CPU with 2+ cores
+* 4GB RAM
+* 1TB free storage space to sync the Mainnet
+* 8 MBit/sec download Internet service
+
+Recommended:
+
+* Fast CPU with 4+ cores
+* 16GB+ RAM
+* High Performance SSD with at least 1TB free space
+* 25+ MBit/sec download Internet service
+
 ### Full node on the main Ethereum network

 By far the most common scenario is people wanting to simply interact with the Ethereum
 network: create accounts; transfer funds; deploy and interact with contracts. For this
 particular use-case the user doesn't care about years-old historical data, so we can
-fast-sync quickly to the current state of the network. To do so:
+sync quickly to the current state of the network. To do so:

 ```shell
 $ geth console
 ```

 This command will:
- * Start `geth` in fast sync mode (default, can be changed with the `--syncmode` flag),
+ * Start `geth` in snap sync mode (default, can be changed with the `--syncmode` flag),
   causing it to download more data in exchange for avoiding processing the entire history
   of the Ethereum network, which is very CPU intensive.
 * Start up `geth`'s built-in interactive [JavaScript console](https://geth.ethereum.org/docs/interface/javascript-console),
-   (via the trailing `console` subcommand) through which you can interact using [`web3` methods](https://web3js.readthedocs.io/en/) 
+   (via the trailing `console` subcommand) through which you can interact using [`web3` methods](https://github.com/ChainSafe/web3.js/blob/0.20.7/DOCUMENTATION.md) 
   (note: the `web3` version bundled within `geth` is very old, and not up to date with official docs),
   as well as `geth`'s own [management APIs](https://geth.ethereum.org/docs/rpc/server).
   This tool is optional and if you leave it out you can always attach to an already running
@@ -159,13 +175,13 @@ docker run -d --name ethereum-node -v /Users/alice/ethereum:/root \
           ethereum/client-go
 ```

-This will start `geth` in fast-sync mode with a DB memory allowance of 1GB just as the
+This will start `geth` in snap-sync mode with a DB memory allowance of 1GB just as the
 above command does.  It will also create a persistent volume in your home directory for
 saving your blockchain as well as map the default ports. There is also an `alpine` tag
 available for a slim version of the image.

 Do not forget `--http.addr 0.0.0.0`, if you want to access RPC from other containers
-and/or hosts. By default, `geth` binds to the local interface and RPC endpoints is not
+and/or hosts. By default, `geth` binds to the local interface and RPC endpoints are not
 accessible from the outside.

 ### Programmatically interfacing `geth` nodes
@@ -231,7 +247,8 @@ aware of and agree upon. This consists of a small JSON file (e.g. call it `genes
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0,
-    "berlinBlock": 0
+    "berlinBlock": 0,
+    "londonBlock": 0
  },
  "alloc": {},
  "coinbase": "0x0000000000000000000000000000000000000000",
@@ -332,7 +349,7 @@ from anyone on the internet, and are grateful for even the smallest of fixes!

 If you'd like to contribute to go-ethereum, please fork, fix, commit and send a pull request
 for the maintainers to review and merge into the main code base. If you wish to submit
-more complex changes though, please check up with the core devs first on [our gitter channel](https://gitter.im/ethereum/go-ethereum)
+more complex changes though, please check up with the core devs first on [our Discord Server](https://discord.gg/invite/nthXNEv)
 to ensure those changes are in line with the general philosophy of the project and/or get
 some early feedback which can make both your efforts much lighter as well as our review
 and merge procedures quick and simple.
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -12,12 +12,14 @@ Audit reports are published in the `docs` folder: https://github.com/ethereum/go
 | ------- | ------- | ----------- |
 | `geth` | 20170425 | [pdf](https://github.com/ethereum/go-ethereum/blob/master/docs/audits/2017-04-25_Geth-audit_Truesec.pdf) |
 | `clef` | 20180914 | [pdf](https://github.com/ethereum/go-ethereum/blob/master/docs/audits/2018-09-14_Clef-audit_NCC.pdf) |
+| `Discv5` | 20191015 | [pdf](https://github.com/ethereum/go-ethereum/blob/master/docs/audits/2019-10-15_Discv5_audit_LeastAuthority.pdf) |
+| `Discv5` | 20200124 | [pdf](https://github.com/ethereum/go-ethereum/blob/master/docs/audits/2020-01-24_DiscV5_audit_Cure53.pdf) |

 ## Reporting a Vulnerability

 **Please do not file a public ticket** mentioning the vulnerability.

-To find out how to disclose a vulnerability in Ethereum visit [https://bounty.ethereum.org](https://bounty.ethereum.org) or email bounty@ethereum.org. Please read the [disclosure page](https://github.com/ethereum/go-ethereum/security/advisories?state=published) for more information about publically disclosed security vulnerabilities.
+To find out how to disclose a vulnerability in Ethereum visit [https://bounty.ethereum.org](https://bounty.ethereum.org) or email bounty@ethereum.org. Please read the [disclosure page](https://github.com/ethereum/go-ethereum/security/advisories?state=published) for more information about publicly disclosed security vulnerabilities.

 Use the built-in `geth version-check` feature to check whether the software is affected by any known vulnerability. This command will fetch the latest [`vulnerabilities.json`](https://geth.ethereum.org/docs/vulnerabilities/vulnerabilities.json) file which contains known security vulnerabilities concerning `geth`, and cross-check the data against its own version number.

@@ -27,92 +29,147 @@ Fingerprint: `AE96 ED96 9E47 9B00 84F3 E17F E88D 3334 FA5F 6A0A`

 ```
 -----BEGIN PGP PUBLIC KEY BLOCK-----
-Version: GnuPG v1
+Version: SKS 1.1.6
+Comment: Hostname: pgp.mit.edu

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+=arte
+-----END PGP PUBLIC KEY BLOCK------
 ```
--- a/accounts/abi/abi.go
+++ b/accounts/abi/abi.go
@@ -34,6 +34,7 @@ type ABI struct {
 	Constructor Method
 	Methods     map[string]Method
 	Events      map[string]Event
+	Errors      map[string]Error

 	// Additional "special" functions introduced in solidity v0.6.0.
 	// It's separated from the original default fallback. Each contract
@@ -157,12 +158,13 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
 	}
 	abi.Methods = make(map[string]Method)
 	abi.Events = make(map[string]Event)
+	abi.Errors = make(map[string]Error)
 	for _, field := range fields {
 		switch field.Type {
 		case "constructor":
 			abi.Constructor = NewMethod("", "", Constructor, field.StateMutability, field.Constant, field.Payable, field.Inputs, nil)
 		case "function":
-			name := abi.overloadedMethodName(field.Name)
+			name := overloadedName(field.Name, func(s string) bool { _, ok := abi.Methods[s]; return ok })
 			abi.Methods[name] = NewMethod(name, field.Name, Function, field.StateMutability, field.Constant, field.Payable, field.Inputs, field.Outputs)
 		case "fallback":
 			// New introduced function type in v0.6.0, check more detail
@@ -182,8 +184,10 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
 			}
 			abi.Receive = NewMethod("", "", Receive, field.StateMutability, field.Constant, field.Payable, nil, nil)
 		case "event":
-			name := abi.overloadedEventName(field.Name)
+			name := overloadedName(field.Name, func(s string) bool { _, ok := abi.Events[s]; return ok })
 			abi.Events[name] = NewEvent(name, field.Name, field.Anonymous, field.Inputs)
+		case "error":
+			abi.Errors[field.Name] = NewError(field.Name, field.Inputs)
 		default:
 			return fmt.Errorf("abi: could not recognize type %v of field %v", field.Type, field.Name)
 		}
@@ -191,36 +195,6 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
 	return nil
 }

-// overloadedMethodName returns the next available name for a given function.
-// Needed since solidity allows for function overload.
-//
-// e.g. if the abi contains Methods send, send1
-// overloadedMethodName would return send2 for input send.
-func (abi *ABI) overloadedMethodName(rawName string) string {
-	name := rawName
-	_, ok := abi.Methods[name]
-	for idx := 0; ok; idx++ {
-		name = fmt.Sprintf("%s%d", rawName, idx)
-		_, ok = abi.Methods[name]
-	}
-	return name
-}
-
-// overloadedEventName returns the next available name for a given event.
-// Needed since solidity allows for event overload.
-//
-// e.g. if the abi contains events received, received1
-// overloadedEventName would return received2 for input received.
-func (abi *ABI) overloadedEventName(rawName string) string {
-	name := rawName
-	_, ok := abi.Events[name]
-	for idx := 0; ok; idx++ {
-		name = fmt.Sprintf("%s%d", rawName, idx)
-		_, ok = abi.Events[name]
-	}
-	return name
-}
-
 // MethodById looks up a method by the 4-byte id,
 // returns nil if none found.
 func (abi *ABI) MethodById(sigdata []byte) (*Method, error) {
@@ -277,3 +251,20 @@ func UnpackRevert(data []byte) (string, error) {
 	}
 	return unpacked[0].(string), nil
 }
+
+// overloadedName returns the next available name for a given thing.
+// Needed since solidity allows for overloading.
+//
+// e.g. if the abi contains Methods send, send1
+// overloadedName would return send2 for input send.
+//
+// overloadedName works for methods, events and errors.
+func overloadedName(rawName string, isAvail func(string) bool) string {
+	name := rawName
+	ok := isAvail(name)
+	for idx := 0; ok; idx++ {
+		name = fmt.Sprintf("%s%d", rawName, idx)
+		ok = isAvail(name)
+	}
+	return name
+}
--- a/accounts/abi/abi_test.go
+++ b/accounts/abi/abi_test.go
@@ -295,6 +295,20 @@ func TestOverloadedMethodSignature(t *testing.T) {
 	check("bar0", "bar(uint256,uint256)", false)
 }

+func TestCustomErrors(t *testing.T) {
+	json := `[{ "inputs": [	{ "internalType": "uint256", "name": "", "type": "uint256" } ],"name": "MyError", "type": "error"} ]`
+	abi, err := JSON(strings.NewReader(json))
+	if err != nil {
+		t.Fatal(err)
+	}
+	check := func(name string, expect string) {
+		if abi.Errors[name].Sig != expect {
+			t.Fatalf("The signature of overloaded method mismatch, want %s, have %s", expect, abi.Methods[name].Sig)
+		}
+	}
+	check("MyError", "MyError(uint256)")
+}
+
 func TestMultiPack(t *testing.T) {
 	abi, err := JSON(strings.NewReader(jsondata))
 	if err != nil {
--- a/accounts/abi/argument.go
+++ b/accounts/abi/argument.go
@@ -78,16 +78,10 @@ func (arguments Arguments) isTuple() bool {
 // Unpack performs the operation hexdata -> Go format.
 func (arguments Arguments) Unpack(data []byte) ([]interface{}, error) {
 	if len(data) == 0 {
-		if len(arguments) != 0 {
+		if len(arguments.NonIndexed()) != 0 {
 			return nil, fmt.Errorf("abi: attempting to unmarshall an empty string while arguments are expected")
 		}
-		// Nothing to unmarshal, return default variables
-		nonIndexedArgs := arguments.NonIndexed()
-		defaultVars := make([]interface{}, len(nonIndexedArgs))
-		for index, arg := range nonIndexedArgs {
-			defaultVars[index] = reflect.New(arg.Type.GetType())
-		}
-		return defaultVars, nil
+		return make([]interface{}, 0), nil
 	}
 	return arguments.UnpackValues(data)
 }
@@ -99,7 +93,7 @@ func (arguments Arguments) UnpackIntoMap(v map[string]interface{}, data []byte)
 		return fmt.Errorf("abi: cannot unpack into a nil map")
 	}
 	if len(data) == 0 {
-		if len(arguments) != 0 {
+		if len(arguments.NonIndexed()) != 0 {
 			return fmt.Errorf("abi: attempting to unmarshall an empty string while arguments are expected")
 		}
 		return nil // Nothing to unmarshal, return
@@ -121,8 +115,8 @@ func (arguments Arguments) Copy(v interface{}, values []interface{}) error {
 		return fmt.Errorf("abi: Unpack(non-pointer %T)", v)
 	}
 	if len(values) == 0 {
-		if len(arguments) != 0 {
-			return fmt.Errorf("abi: attempting to copy no values while %d arguments are expected", len(arguments))
+		if len(arguments.NonIndexed()) != 0 {
+			return fmt.Errorf("abi: attempting to copy no values while arguments are expected")
 		}
 		return nil // Nothing to copy, return
 	}
@@ -137,7 +131,7 @@ func (arguments Arguments) copyAtomic(v interface{}, marshalledValues interface{
 	dst := reflect.ValueOf(v).Elem()
 	src := reflect.ValueOf(marshalledValues)

-	if dst.Kind() == reflect.Struct && src.Kind() != reflect.Struct {
+	if dst.Kind() == reflect.Struct {
 		return set(dst.Field(0), src)
 	}
 	return set(dst, src)
--- a/accounts/abi/bind/auth.go
+++ b/accounts/abi/bind/auth.go
@@ -17,10 +17,10 @@
 package bind

 import (
+	"context"
 	"crypto/ecdsa"
 	"errors"
 	"io"
-	"io/ioutil"
 	"math/big"

 	"github.com/ethereum/go-ethereum/accounts"
@@ -44,7 +44,7 @@ var ErrNotAuthorized = errors.New("not authorized to sign this account")
 // Deprecated: Use NewTransactorWithChainID instead.
 func NewTransactor(keyin io.Reader, passphrase string) (*TransactOpts, error) {
 	log.Warn("WARNING: NewTransactor has been deprecated in favour of NewTransactorWithChainID")
-	json, err := ioutil.ReadAll(keyin)
+	json, err := io.ReadAll(keyin)
 	if err != nil {
 		return nil, err
 	}
@@ -74,6 +74,7 @@ func NewKeyStoreTransactor(keystore *keystore.KeyStore, account accounts.Account
 			}
 			return tx.WithSignature(signer, signature)
 		},
+		Context: context.Background(),
 	}, nil
 }

@@ -97,13 +98,14 @@ func NewKeyedTransactor(key *ecdsa.PrivateKey) *TransactOpts {
 			}
 			return tx.WithSignature(signer, signature)
 		},
+		Context: context.Background(),
 	}
 }

 // NewTransactorWithChainID is a utility method to easily create a transaction signer from
 // an encrypted json key stream and the associated passphrase.
 func NewTransactorWithChainID(keyin io.Reader, passphrase string, chainID *big.Int) (*TransactOpts, error) {
-	json, err := ioutil.ReadAll(keyin)
+	json, err := io.ReadAll(keyin)
 	if err != nil {
 		return nil, err
 	}
@@ -133,6 +135,7 @@ func NewKeyStoreTransactorWithChainID(keystore *keystore.KeyStore, account accou
 			}
 			return tx.WithSignature(signer, signature)
 		},
+		Context: context.Background(),
 	}, nil
 }

@@ -156,6 +159,7 @@ func NewKeyedTransactorWithChainID(key *ecdsa.PrivateKey, chainID *big.Int) (*Tr
 			}
 			return tx.WithSignature(signer, signature)
 		},
+		Context: context.Background(),
 	}, nil
 }

@@ -170,5 +174,6 @@ func NewClefTransactor(clef *external.ExternalSigner, account accounts.Account)
 			}
 			return clef.SignTx(account, transaction, nil) // Clef enforces its own chain id
 		},
+		Context: context.Background(),
 	}
 }
--- a/accounts/abi/bind/backend.go
+++ b/accounts/abi/bind/backend.go
@@ -32,12 +32,12 @@ var (
 	// have any code associated with it (i.e. suicided).
 	ErrNoCode = errors.New("no contract code at given address")

-	// This error is raised when attempting to perform a pending state action
+	// ErrNoPendingState is raised when attempting to perform a pending state action
 	// on a backend that doesn't implement PendingContractCaller.
 	ErrNoPendingState = errors.New("backend does not support pending state")

-	// This error is returned by WaitDeployed if contract creation leaves an
-	// empty contract behind.
+	// ErrNoCodeAfterDeploy is returned by WaitDeployed if contract creation leaves
+	// an empty contract behind.
 	ErrNoCodeAfterDeploy = errors.New("no contract code after deployment")
 )

@@ -47,7 +47,8 @@ type ContractCaller interface {
 	// CodeAt returns the code of the given account. This is needed to differentiate
 	// between contract internal errors and the local chain being out of sync.
 	CodeAt(ctx context.Context, contract common.Address, blockNumber *big.Int) ([]byte, error)
-	// ContractCall executes an Ethereum contract call with the specified data as the
+
+	// CallContract executes an Ethereum contract call with the specified data as the
 	// input.
 	CallContract(ctx context.Context, call ethereum.CallMsg, blockNumber *big.Int) ([]byte, error)
 }
@@ -58,6 +59,7 @@ type ContractCaller interface {
 type PendingContractCaller interface {
 	// PendingCodeAt returns the code of the given account in the pending state.
 	PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error)
+
 	// PendingCallContract executes an Ethereum contract call against the pending state.
 	PendingCallContract(ctx context.Context, call ethereum.CallMsg) ([]byte, error)
 }
@@ -67,19 +69,31 @@ type PendingContractCaller interface {
 // used when the user does not provide some needed values, but rather leaves it up
 // to the transactor to decide.
 type ContractTransactor interface {
+	// HeaderByNumber returns a block header from the current canonical chain. If
+	// number is nil, the latest known header is returned.
+	HeaderByNumber(ctx context.Context, number *big.Int) (*types.Header, error)
+
 	// PendingCodeAt returns the code of the given account in the pending state.
 	PendingCodeAt(ctx context.Context, account common.Address) ([]byte, error)
+
 	// PendingNonceAt retrieves the current pending nonce associated with an account.
 	PendingNonceAt(ctx context.Context, account common.Address) (uint64, error)
+
 	// SuggestGasPrice retrieves the currently suggested gas price to allow a timely
 	// execution of a transaction.
 	SuggestGasPrice(ctx context.Context) (*big.Int, error)
+
+	// SuggestGasTipCap retrieves the currently suggested 1559 priority fee to allow
+	// a timely execution of a transaction.
+	SuggestGasTipCap(ctx context.Context) (*big.Int, error)
+
 	// EstimateGas tries to estimate the gas needed to execute a specific
 	// transaction based on the current pending state of the backend blockchain.
 	// There is no guarantee that this is the true gas limit requirement as other
 	// transactions may be added or removed by miners, but it should provide a basis
 	// for setting a reasonable default.
 	EstimateGas(ctx context.Context, call ethereum.CallMsg) (gas uint64, err error)
+
 	// SendTransaction injects the transaction into the pending pool for execution.
 	SendTransaction(ctx context.Context, tx *types.Transaction) error
 }
--- a/accounts/abi/bind/backends/simulated.go
+++ b/accounts/abi/bind/backends/simulated.go
@@ -86,7 +86,7 @@ func NewSimulatedBackendWithDatabase(database ethdb.Database, alloc core.Genesis
 		config:     genesis.Config,
 		events:     filters.NewEventSystem(&filterBackend{database, blockchain}, false),
 	}
-	backend.rollback()
+	backend.rollback(blockchain.CurrentBlock())
 	return backend
 }

@@ -112,7 +112,9 @@ func (b *SimulatedBackend) Commit() {
 	if _, err := b.blockchain.InsertChain([]*types.Block{b.pendingBlock}); err != nil {
 		panic(err) // This cannot happen unless the simulator is wrong, fail in that case
 	}
-	b.rollback()
+	// Using the last inserted block here makes it possible to build on a side
+	// chain after a fork.
+	b.rollback(b.pendingBlock)
 }

 // Rollback aborts all pending transactions, reverting to the last committed state.
@@ -120,22 +122,49 @@ func (b *SimulatedBackend) Rollback() {
 	b.mu.Lock()
 	defer b.mu.Unlock()

-	b.rollback()
+	b.rollback(b.blockchain.CurrentBlock())
 }

-func (b *SimulatedBackend) rollback() {
-	blocks, _ := core.GenerateChain(b.config, b.blockchain.CurrentBlock(), ethash.NewFaker(), b.database, 1, func(int, *core.BlockGen) {})
+func (b *SimulatedBackend) rollback(parent *types.Block) {
+	blocks, _ := core.GenerateChain(b.config, parent, ethash.NewFaker(), b.database, 1, func(int, *core.BlockGen) {})

 	b.pendingBlock = blocks[0]
 	b.pendingState, _ = state.New(b.pendingBlock.Root(), b.blockchain.StateCache(), nil)
 }

+// Fork creates a side-chain that can be used to simulate reorgs.
+//
+// This function should be called with the ancestor block where the new side
+// chain should be started. Transactions (old and new) can then be applied on
+// top and Commit-ed.
+//
+// Note, the side-chain will only become canonical (and trigger the events) when
+// it becomes longer. Until then CallContract will still operate on the current
+// canonical chain.
+//
+// There is a % chance that the side chain becomes canonical at the same length
+// to simulate live network behavior.
+func (b *SimulatedBackend) Fork(ctx context.Context, parent common.Hash) error {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	if len(b.pendingBlock.Transactions()) != 0 {
+		return errors.New("pending block dirty")
+	}
+	block, err := b.blockByHash(ctx, parent)
+	if err != nil {
+		return err
+	}
+	b.rollback(block)
+	return nil
+}
+
 // stateByBlockNumber retrieves a state by a given blocknumber.
 func (b *SimulatedBackend) stateByBlockNumber(ctx context.Context, blockNumber *big.Int) (*state.StateDB, error) {
 	if blockNumber == nil || blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) == 0 {
 		return b.blockchain.State()
 	}
-	block, err := b.blockByNumberNoLock(ctx, blockNumber)
+	block, err := b.blockByNumber(ctx, blockNumber)
 	if err != nil {
 		return nil, err
 	}
@@ -201,6 +230,9 @@ func (b *SimulatedBackend) TransactionReceipt(ctx context.Context, txHash common
 	defer b.mu.Unlock()

 	receipt, _, _, _ := rawdb.ReadReceipt(b.database, txHash, b.config)
+	if receipt == nil {
+		return nil, ethereum.NotFound
+	}
 	return receipt, nil
 }

@@ -228,6 +260,11 @@ func (b *SimulatedBackend) BlockByHash(ctx context.Context, hash common.Hash) (*
 	b.mu.Lock()
 	defer b.mu.Unlock()

+	return b.blockByHash(ctx, hash)
+}
+
+// blockByHash retrieves a block based on the block hash without Locking.
+func (b *SimulatedBackend) blockByHash(ctx context.Context, hash common.Hash) (*types.Block, error) {
 	if hash == b.pendingBlock.Hash() {
 		return b.pendingBlock, nil
 	}
@@ -246,12 +283,12 @@ func (b *SimulatedBackend) BlockByNumber(ctx context.Context, number *big.Int) (
 	b.mu.Lock()
 	defer b.mu.Unlock()

-	return b.blockByNumberNoLock(ctx, number)
+	return b.blockByNumber(ctx, number)
 }

-// blockByNumberNoLock retrieves a block from the database by number, caching it
+// blockByNumber retrieves a block from the database by number, caching it
 // (associated with its hash) if found without Lock.
-func (b *SimulatedBackend) blockByNumberNoLock(ctx context.Context, number *big.Int) (*types.Block, error) {
+func (b *SimulatedBackend) blockByNumber(ctx context.Context, number *big.Int) (*types.Block, error) {
 	if number == nil || number.Cmp(b.pendingBlock.Number()) == 0 {
 		return b.blockchain.CurrentBlock(), nil
 	}
@@ -428,6 +465,18 @@ func (b *SimulatedBackend) PendingNonceAt(ctx context.Context, account common.Ad
 // SuggestGasPrice implements ContractTransactor.SuggestGasPrice. Since the simulated
 // chain doesn't have miners, we just return a gas price of 1 for any call.
 func (b *SimulatedBackend) SuggestGasPrice(ctx context.Context) (*big.Int, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	if b.pendingBlock.Header().BaseFee != nil {
+		return b.pendingBlock.Header().BaseFee, nil
+	}
+	return big.NewInt(1), nil
+}
+
+// SuggestGasTipCap implements ContractTransactor.SuggestGasTipCap. Since the simulated
+// chain doesn't have miners, we just return a gas tip of 1 for any call.
+func (b *SimulatedBackend) SuggestGasTipCap(ctx context.Context) (*big.Int, error) {
 	return big.NewInt(1), nil
 }

@@ -448,8 +497,19 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
 	} else {
 		hi = b.pendingBlock.GasLimit()
 	}
+	// Normalize the max fee per gas the call is willing to spend.
+	var feeCap *big.Int
+	if call.GasPrice != nil && (call.GasFeeCap != nil || call.GasTipCap != nil) {
+		return 0, errors.New("both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified")
+	} else if call.GasPrice != nil {
+		feeCap = call.GasPrice
+	} else if call.GasFeeCap != nil {
+		feeCap = call.GasFeeCap
+	} else {
+		feeCap = common.Big0
+	}
 	// Recap the highest gas allowance with account's balance.
-	if call.GasPrice != nil && call.GasPrice.BitLen() != 0 {
+	if feeCap.BitLen() != 0 {
 		balance := b.pendingState.GetBalance(call.From) // from can't be nil
 		available := new(big.Int).Set(balance)
 		if call.Value != nil {
@@ -458,14 +518,14 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
 			}
 			available.Sub(available, call.Value)
 		}
-		allowance := new(big.Int).Div(available, call.GasPrice)
+		allowance := new(big.Int).Div(available, feeCap)
 		if allowance.IsUint64() && hi > allowance.Uint64() {
 			transfer := call.Value
 			if transfer == nil {
 				transfer = new(big.Int)
 			}
 			log.Warn("Gas estimation capped by limited funds", "original", hi, "balance", balance,
-				"sent", transfer, "gasprice", call.GasPrice, "fundable", allowance)
+				"sent", transfer, "feecap", feeCap, "fundable", allowance)
 			hi = allowance.Uint64()
 		}
 	}
@@ -527,10 +587,38 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
 // callContract implements common code between normal and pending contract calls.
 // state is modified during execution, make sure to copy it if necessary.
 func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallMsg, block *types.Block, stateDB *state.StateDB) (*core.ExecutionResult, error) {
-	// Ensure message is initialized properly.
-	if call.GasPrice == nil {
-		call.GasPrice = big.NewInt(1)
+	// Gas prices post 1559 need to be initialized
+	if call.GasPrice != nil && (call.GasFeeCap != nil || call.GasTipCap != nil) {
+		return nil, errors.New("both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified")
 	}
+	head := b.blockchain.CurrentHeader()
+	if !b.blockchain.Config().IsLondon(head.Number) {
+		// If there's no basefee, then it must be a non-1559 execution
+		if call.GasPrice == nil {
+			call.GasPrice = new(big.Int)
+		}
+		call.GasFeeCap, call.GasTipCap = call.GasPrice, call.GasPrice
+	} else {
+		// A basefee is provided, necessitating 1559-type execution
+		if call.GasPrice != nil {
+			// User specified the legacy gas field, convert to 1559 gas typing
+			call.GasFeeCap, call.GasTipCap = call.GasPrice, call.GasPrice
+		} else {
+			// User specified 1559 gas feilds (or none), use those
+			if call.GasFeeCap == nil {
+				call.GasFeeCap = new(big.Int)
+			}
+			if call.GasTipCap == nil {
+				call.GasTipCap = new(big.Int)
+			}
+			// Backfill the legacy gasPrice for EVM execution, unless we're all zeroes
+			call.GasPrice = new(big.Int)
+			if call.GasFeeCap.BitLen() > 0 || call.GasTipCap.BitLen() > 0 {
+				call.GasPrice = math.BigMin(new(big.Int).Add(call.GasTipCap, head.BaseFee), call.GasFeeCap)
+			}
+		}
+	}
+	// Ensure message is initialized properly.
 	if call.Gas == 0 {
 		call.Gas = 50000000
 	}
@@ -547,31 +635,33 @@ func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallM
 	evmContext := core.NewEVMBlockContext(block.Header(), b.blockchain, nil)
 	// Create a new environment which holds all relevant information
 	// about the transaction and calling mechanisms.
-	vmEnv := vm.NewEVM(evmContext, txContext, stateDB, b.config, vm.Config{})
+	vmEnv := vm.NewEVM(evmContext, txContext, stateDB, b.config, vm.Config{NoBaseFee: true})
 	gasPool := new(core.GasPool).AddGas(math.MaxUint64)

 	return core.NewStateTransition(vmEnv, msg, gasPool).TransitionDb()
 }

 // SendTransaction updates the pending block to include the given transaction.
-// It panics if the transaction is invalid.
 func (b *SimulatedBackend) SendTransaction(ctx context.Context, tx *types.Transaction) error {
 	b.mu.Lock()
 	defer b.mu.Unlock()

-	// Check transaction validity.
-	block := b.blockchain.CurrentBlock()
+	// Get the last block
+	block, err := b.blockByHash(ctx, b.pendingBlock.ParentHash())
+	if err != nil {
+		return fmt.Errorf("could not fetch parent")
+	}
+	// Check transaction validity
 	signer := types.MakeSigner(b.blockchain.Config(), block.Number())
 	sender, err := types.Sender(signer, tx)
 	if err != nil {
-		panic(fmt.Errorf("invalid transaction: %v", err))
+		return fmt.Errorf("invalid transaction: %v", err)
 	}
 	nonce := b.pendingState.GetNonce(sender)
 	if tx.Nonce() != nonce {
-		panic(fmt.Errorf("invalid transaction nonce: got %d, want %d", tx.Nonce(), nonce))
+		return fmt.Errorf("invalid transaction nonce: got %d, want %d", tx.Nonce(), nonce)
 	}
-
-	// Include tx in chain.
+	// Include tx in chain
 	blocks, _ := core.GenerateChain(b.config, block, ethash.NewFaker(), b.database, 1, func(number int, block *core.BlockGen) {
 		for _, tx := range b.pendingBlock.Transactions() {
 			block.AddTxWithChain(b.blockchain, tx)
@@ -713,9 +803,11 @@ type callMsg struct {

 func (m callMsg) From() common.Address         { return m.CallMsg.From }
 func (m callMsg) Nonce() uint64                { return 0 }
-func (m callMsg) CheckNonce() bool             { return false }
+func (m callMsg) IsFake() bool                 { return true }
 func (m callMsg) To() *common.Address          { return m.CallMsg.To }
 func (m callMsg) GasPrice() *big.Int           { return m.CallMsg.GasPrice }
+func (m callMsg) GasFeeCap() *big.Int          { return m.CallMsg.GasFeeCap }
+func (m callMsg) GasTipCap() *big.Int          { return m.CallMsg.GasTipCap }
 func (m callMsg) Gas() uint64                  { return m.CallMsg.Gas }
 func (m callMsg) Value() *big.Int              { return m.CallMsg.Value }
 func (m callMsg) Data() []byte                 { return m.CallMsg.Data }
--- a/accounts/abi/bind/backends/simulated_test.go
+++ b/accounts/abi/bind/backends/simulated_test.go
@@ -21,6 +21,7 @@ import (
 	"context"
 	"errors"
 	"math/big"
+	"math/rand"
 	"reflect"
 	"strings"
 	"testing"
@@ -58,9 +59,12 @@ func TestSimulatedBackend(t *testing.T) {
 	}

 	// generate a transaction and confirm you can retrieve it
+	head, _ := sim.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
 	code := `6060604052600a8060106000396000f360606040526008565b00`
 	var gas uint64 = 3000000
-	tx := types.NewContractCreation(0, big.NewInt(0), gas, big.NewInt(1), common.FromHex(code))
+	tx := types.NewContractCreation(0, big.NewInt(0), gas, gasPrice, common.FromHex(code))
 	tx, _ = types.SignTx(tx, types.HomesteadSigner{}, key)

 	err = sim.SendTransaction(context.Background(), tx)
@@ -110,14 +114,14 @@ var expectedReturn = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
 func simTestBackend(testAddr common.Address) *SimulatedBackend {
 	return NewSimulatedBackend(
 		core.GenesisAlloc{
-			testAddr: {Balance: big.NewInt(10000000000)},
+			testAddr: {Balance: big.NewInt(10000000000000000)},
 		}, 10000000,
 	)
 }

 func TestNewSimulatedBackend(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)
-	expectedBal := big.NewInt(10000000000)
+	expectedBal := big.NewInt(10000000000000000)
 	sim := simTestBackend(testAddr)
 	defer sim.Close()

@@ -136,7 +140,7 @@ func TestNewSimulatedBackend(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_AdjustTime(t *testing.T) {
+func TestAdjustTime(t *testing.T) {
 	sim := NewSimulatedBackend(
 		core.GenesisAlloc{}, 10000000,
 	)
@@ -153,11 +157,15 @@ func TestSimulatedBackend_AdjustTime(t *testing.T) {
 	}
 }

-func TestNewSimulatedBackend_AdjustTimeFail(t *testing.T) {
+func TestNewAdjustTimeFail(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)
 	sim := simTestBackend(testAddr)
+
 	// Create tx and send
-	tx := types.NewTransaction(0, testAddr, big.NewInt(1000), params.TxGas, big.NewInt(1), nil)
+	head, _ := sim.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
+	tx := types.NewTransaction(0, testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
 	signedTx, err := types.SignTx(tx, types.HomesteadSigner{}, testKey)
 	if err != nil {
 		t.Errorf("could not sign tx: %v", err)
@@ -178,7 +186,7 @@ func TestNewSimulatedBackend_AdjustTimeFail(t *testing.T) {
 		t.Errorf("adjusted time not equal to a minute. prev: %v, new: %v", prevTime, newTime)
 	}
 	// Put a transaction after adjusting time
-	tx2 := types.NewTransaction(1, testAddr, big.NewInt(1000), params.TxGas, big.NewInt(1), nil)
+	tx2 := types.NewTransaction(1, testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
 	signedTx2, err := types.SignTx(tx2, types.HomesteadSigner{}, testKey)
 	if err != nil {
 		t.Errorf("could not sign tx: %v", err)
@@ -191,9 +199,9 @@ func TestNewSimulatedBackend_AdjustTimeFail(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_BalanceAt(t *testing.T) {
+func TestBalanceAt(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)
-	expectedBal := big.NewInt(10000000000)
+	expectedBal := big.NewInt(10000000000000000)
 	sim := simTestBackend(testAddr)
 	defer sim.Close()
 	bgCtx := context.Background()
@@ -208,7 +216,7 @@ func TestSimulatedBackend_BalanceAt(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_BlockByHash(t *testing.T) {
+func TestBlockByHash(t *testing.T) {
 	sim := NewSimulatedBackend(
 		core.GenesisAlloc{}, 10000000,
 	)
@@ -229,7 +237,7 @@ func TestSimulatedBackend_BlockByHash(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_BlockByNumber(t *testing.T) {
+func TestBlockByNumber(t *testing.T) {
 	sim := NewSimulatedBackend(
 		core.GenesisAlloc{}, 10000000,
 	)
@@ -264,7 +272,7 @@ func TestSimulatedBackend_BlockByNumber(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_NonceAt(t *testing.T) {
+func TestNonceAt(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)

 	sim := simTestBackend(testAddr)
@@ -281,7 +289,10 @@ func TestSimulatedBackend_NonceAt(t *testing.T) {
 	}

 	// create a signed transaction to send
-	tx := types.NewTransaction(nonce, testAddr, big.NewInt(1000), params.TxGas, big.NewInt(1), nil)
+	head, _ := sim.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
+	tx := types.NewTransaction(nonce, testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
 	signedTx, err := types.SignTx(tx, types.HomesteadSigner{}, testKey)
 	if err != nil {
 		t.Errorf("could not sign tx: %v", err)
@@ -314,7 +325,7 @@ func TestSimulatedBackend_NonceAt(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_SendTransaction(t *testing.T) {
+func TestSendTransaction(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)

 	sim := simTestBackend(testAddr)
@@ -322,7 +333,10 @@ func TestSimulatedBackend_SendTransaction(t *testing.T) {
 	bgCtx := context.Background()

 	// create a signed transaction to send
-	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, big.NewInt(1), nil)
+	head, _ := sim.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
+	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
 	signedTx, err := types.SignTx(tx, types.HomesteadSigner{}, testKey)
 	if err != nil {
 		t.Errorf("could not sign tx: %v", err)
@@ -345,19 +359,22 @@ func TestSimulatedBackend_SendTransaction(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_TransactionByHash(t *testing.T) {
+func TestTransactionByHash(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)

 	sim := NewSimulatedBackend(
 		core.GenesisAlloc{
-			testAddr: {Balance: big.NewInt(10000000000)},
+			testAddr: {Balance: big.NewInt(10000000000000000)},
 		}, 10000000,
 	)
 	defer sim.Close()
 	bgCtx := context.Background()

 	// create a signed transaction to send
-	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, big.NewInt(1), nil)
+	head, _ := sim.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
+	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
 	signedTx, err := types.SignTx(tx, types.HomesteadSigner{}, testKey)
 	if err != nil {
 		t.Errorf("could not sign tx: %v", err)
@@ -396,7 +413,7 @@ func TestSimulatedBackend_TransactionByHash(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_EstimateGas(t *testing.T) {
+func TestEstimateGas(t *testing.T) {
 	/*
 		pragma solidity ^0.6.4;
 		contract GasEstimation {
@@ -479,7 +496,7 @@ func TestSimulatedBackend_EstimateGas(t *testing.T) {
 			GasPrice: big.NewInt(0),
 			Value:    nil,
 			Data:     common.Hex2Bytes("b9b046f9"),
-		}, 0, errors.New("invalid opcode: opcode 0xfe not defined"), nil},
+		}, 0, errors.New("invalid opcode: INVALID"), nil},

 		{"Valid", ethereum.CallMsg{
 			From:     addr,
@@ -514,7 +531,7 @@ func TestSimulatedBackend_EstimateGas(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_EstimateGasWithPrice(t *testing.T) {
+func TestEstimateGasWithPrice(t *testing.T) {
 	key, _ := crypto.GenerateKey()
 	addr := crypto.PubkeyToAddress(key.PublicKey)

@@ -533,7 +550,7 @@ func TestSimulatedBackend_EstimateGasWithPrice(t *testing.T) {
 			To:       &recipient,
 			Gas:      0,
 			GasPrice: big.NewInt(0),
-			Value:    big.NewInt(1000),
+			Value:    big.NewInt(100000000000),
 			Data:     nil,
 		}, 21000, nil},

@@ -541,8 +558,8 @@ func TestSimulatedBackend_EstimateGasWithPrice(t *testing.T) {
 			From:     addr,
 			To:       &recipient,
 			Gas:      0,
-			GasPrice: big.NewInt(1000),
-			Value:    big.NewInt(1000),
+			GasPrice: big.NewInt(100000000000),
+			Value:    big.NewInt(100000000000),
 			Data:     nil,
 		}, 21000, nil},

@@ -560,28 +577,51 @@ func TestSimulatedBackend_EstimateGasWithPrice(t *testing.T) {
 			To:       &recipient,
 			Gas:      0,
 			GasPrice: big.NewInt(2e14), // gascost = 4.2ether
-			Value:    big.NewInt(1000),
+			Value:    big.NewInt(100000000000),
 			Data:     nil,
 		}, 21000, errors.New("gas required exceeds allowance (10999)")}, // 10999=(2.2ether-1000wei)/(2e14)
+
+		{"EstimateEIP1559WithHighFees", ethereum.CallMsg{
+			From:      addr,
+			To:        &addr,
+			Gas:       0,
+			GasFeeCap: big.NewInt(1e14), // maxgascost = 2.1ether
+			GasTipCap: big.NewInt(1),
+			Value:     big.NewInt(1e17), // the remaining balance for fee is 2.1ether
+			Data:      nil,
+		}, params.TxGas, nil},
+
+		{"EstimateEIP1559WithSuperHighFees", ethereum.CallMsg{
+			From:      addr,
+			To:        &addr,
+			Gas:       0,
+			GasFeeCap: big.NewInt(1e14), // maxgascost = 2.1ether
+			GasTipCap: big.NewInt(1),
+			Value:     big.NewInt(1e17 + 1), // the remaining balance for fee is 2.1ether
+			Data:      nil,
+		}, params.TxGas, errors.New("gas required exceeds allowance (20999)")}, // 20999=(2.2ether-0.1ether-1wei)/(1e14)
 	}
-	for _, c := range cases {
+	for i, c := range cases {
 		got, err := sim.EstimateGas(context.Background(), c.message)
 		if c.expectError != nil {
 			if err == nil {
-				t.Fatalf("Expect error, got nil")
+				t.Fatalf("test %d: expect error, got nil", i)
 			}
 			if c.expectError.Error() != err.Error() {
-				t.Fatalf("Expect error, want %v, got %v", c.expectError, err)
+				t.Fatalf("test %d: expect error, want %v, got %v", i, c.expectError, err)
 			}
 			continue
 		}
+		if c.expectError == nil && err != nil {
+			t.Fatalf("test %d: didn't expect error, got %v", i, err)
+		}
 		if got != c.expect {
-			t.Fatalf("Gas estimation mismatch, want %d, got %d", c.expect, got)
+			t.Fatalf("test %d: gas estimation mismatch, want %d, got %d", i, c.expect, got)
 		}
 	}
 }

-func TestSimulatedBackend_HeaderByHash(t *testing.T) {
+func TestHeaderByHash(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)

 	sim := simTestBackend(testAddr)
@@ -602,7 +642,7 @@ func TestSimulatedBackend_HeaderByHash(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_HeaderByNumber(t *testing.T) {
+func TestHeaderByNumber(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)

 	sim := simTestBackend(testAddr)
@@ -649,7 +689,7 @@ func TestSimulatedBackend_HeaderByNumber(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_TransactionCount(t *testing.T) {
+func TestTransactionCount(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)

 	sim := simTestBackend(testAddr)
@@ -668,9 +708,11 @@ func TestSimulatedBackend_TransactionCount(t *testing.T) {
 	if count != 0 {
 		t.Errorf("expected transaction count of %v does not match actual count of %v", 0, count)
 	}
-
 	// create a signed transaction to send
-	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, big.NewInt(1), nil)
+	head, _ := sim.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
+	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
 	signedTx, err := types.SignTx(tx, types.HomesteadSigner{}, testKey)
 	if err != nil {
 		t.Errorf("could not sign tx: %v", err)
@@ -699,7 +741,7 @@ func TestSimulatedBackend_TransactionCount(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_TransactionInBlock(t *testing.T) {
+func TestTransactionInBlock(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)

 	sim := simTestBackend(testAddr)
@@ -723,9 +765,11 @@ func TestSimulatedBackend_TransactionInBlock(t *testing.T) {
 	if pendingNonce != uint64(0) {
 		t.Errorf("expected pending nonce of 0 got %v", pendingNonce)
 	}
-
 	// create a signed transaction to send
-	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, big.NewInt(1), nil)
+	head, _ := sim.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
+	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
 	signedTx, err := types.SignTx(tx, types.HomesteadSigner{}, testKey)
 	if err != nil {
 		t.Errorf("could not sign tx: %v", err)
@@ -762,7 +806,7 @@ func TestSimulatedBackend_TransactionInBlock(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_PendingNonceAt(t *testing.T) {
+func TestPendingNonceAt(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)

 	sim := simTestBackend(testAddr)
@@ -780,7 +824,10 @@ func TestSimulatedBackend_PendingNonceAt(t *testing.T) {
 	}

 	// create a signed transaction to send
-	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, big.NewInt(1), nil)
+	head, _ := sim.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
+	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
 	signedTx, err := types.SignTx(tx, types.HomesteadSigner{}, testKey)
 	if err != nil {
 		t.Errorf("could not sign tx: %v", err)
@@ -803,7 +850,7 @@ func TestSimulatedBackend_PendingNonceAt(t *testing.T) {
 	}

 	// make a new transaction with a nonce of 1
-	tx = types.NewTransaction(uint64(1), testAddr, big.NewInt(1000), params.TxGas, big.NewInt(1), nil)
+	tx = types.NewTransaction(uint64(1), testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
 	signedTx, err = types.SignTx(tx, types.HomesteadSigner{}, testKey)
 	if err != nil {
 		t.Errorf("could not sign tx: %v", err)
@@ -824,7 +871,7 @@ func TestSimulatedBackend_PendingNonceAt(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_TransactionReceipt(t *testing.T) {
+func TestTransactionReceipt(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)

 	sim := simTestBackend(testAddr)
@@ -832,7 +879,10 @@ func TestSimulatedBackend_TransactionReceipt(t *testing.T) {
 	bgCtx := context.Background()

 	// create a signed transaction to send
-	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, big.NewInt(1), nil)
+	head, _ := sim.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
+	tx := types.NewTransaction(uint64(0), testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
 	signedTx, err := types.SignTx(tx, types.HomesteadSigner{}, testKey)
 	if err != nil {
 		t.Errorf("could not sign tx: %v", err)
@@ -855,7 +905,7 @@ func TestSimulatedBackend_TransactionReceipt(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_SuggestGasPrice(t *testing.T) {
+func TestSuggestGasPrice(t *testing.T) {
 	sim := NewSimulatedBackend(
 		core.GenesisAlloc{},
 		10000000,
@@ -866,12 +916,12 @@ func TestSimulatedBackend_SuggestGasPrice(t *testing.T) {
 	if err != nil {
 		t.Errorf("could not get gas price: %v", err)
 	}
-	if gasPrice.Uint64() != uint64(1) {
-		t.Errorf("gas price was not expected value of 1. actual: %v", gasPrice.Uint64())
+	if gasPrice.Uint64() != sim.pendingBlock.Header().BaseFee.Uint64() {
+		t.Errorf("gas price was not expected value of %v. actual: %v", sim.pendingBlock.Header().BaseFee.Uint64(), gasPrice.Uint64())
 	}
 }

-func TestSimulatedBackend_PendingCodeAt(t *testing.T) {
+func TestPendingCodeAt(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)
 	sim := simTestBackend(testAddr)
 	defer sim.Close()
@@ -907,7 +957,7 @@ func TestSimulatedBackend_PendingCodeAt(t *testing.T) {
 	}
 }

-func TestSimulatedBackend_CodeAt(t *testing.T) {
+func TestCodeAt(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)
 	sim := simTestBackend(testAddr)
 	defer sim.Close()
@@ -946,7 +996,7 @@ func TestSimulatedBackend_CodeAt(t *testing.T) {

 // When receive("X") is called with sender 0x00... and value 1, it produces this tx receipt:
 //   receipt{status=1 cgas=23949 bloom=00000000004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000040200000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 logs=[log: b6818c8064f645cd82d99b59a1a267d6d61117ef [75fd880d39c1daf53b6547ab6cb59451fc6452d27caa90e5b6649dd8293b9eed] 000000000000000000000000376c47978271565f56deb45495afa69e59c16ab200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000000158 9ae378b6d4409eada347a5dc0c180f186cb62dc68fcc0f043425eb917335aa28 0 95d429d309bb9d753954195fe2d69bd140b4ae731b9b5b605c34323de162cf00 0]}
-func TestSimulatedBackend_PendingAndCallContract(t *testing.T) {
+func TestPendingAndCallContract(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)
 	sim := simTestBackend(testAddr)
 	defer sim.Close()
@@ -1030,7 +1080,7 @@ contract Reverter {
        }
    }
 }*/
-func TestSimulatedBackend_CallContractRevert(t *testing.T) {
+func TestCallContractRevert(t *testing.T) {
 	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)
 	sim := simTestBackend(testAddr)
 	defer sim.Close()
@@ -1114,3 +1164,175 @@ func TestSimulatedBackend_CallContractRevert(t *testing.T) {
 		sim.Commit()
 	}
 }
+
+// TestFork check that the chain length after a reorg is correct.
+// Steps:
+//  1. Save the current block which will serve as parent for the fork.
+//  2. Mine n blocks with n ∈ [0, 20].
+//  3. Assert that the chain length is n.
+//  4. Fork by using the parent block as ancestor.
+//  5. Mine n+1 blocks which should trigger a reorg.
+//  6. Assert that the chain length is n+1.
+//     Since Commit() was called 2n+1 times in total,
+//     having a chain length of just n+1 means that a reorg occurred.
+func TestFork(t *testing.T) {
+	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)
+	sim := simTestBackend(testAddr)
+	defer sim.Close()
+	// 1.
+	parent := sim.blockchain.CurrentBlock()
+	// 2.
+	n := int(rand.Int31n(21))
+	for i := 0; i < n; i++ {
+		sim.Commit()
+	}
+	// 3.
+	if sim.blockchain.CurrentBlock().NumberU64() != uint64(n) {
+		t.Error("wrong chain length")
+	}
+	// 4.
+	sim.Fork(context.Background(), parent.Hash())
+	// 5.
+	for i := 0; i < n+1; i++ {
+		sim.Commit()
+	}
+	// 6.
+	if sim.blockchain.CurrentBlock().NumberU64() != uint64(n+1) {
+		t.Error("wrong chain length")
+	}
+}
+
+/*
+Example contract to test event emission:
+
+pragma solidity >=0.7.0 <0.9.0;
+contract Callable {
+    event Called();
+    function Call() public { emit Called(); }
+}
+*/
+const callableAbi = "[{\"anonymous\":false,\"inputs\":[],\"name\":\"Called\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"Call\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]"
+
+const callableBin = "6080604052348015600f57600080fd5b5060998061001e6000396000f3fe6080604052348015600f57600080fd5b506004361060285760003560e01c806334e2292114602d575b600080fd5b60336035565b005b7f81fab7a4a0aa961db47eefc81f143a5220e8c8495260dd65b1356f1d19d3c7b860405160405180910390a156fea2646970667358221220029436d24f3ac598ceca41d4d712e13ced6d70727f4cdc580667de66d2f51d8b64736f6c63430008010033"
+
+// TestForkLogsReborn check that the simulated reorgs
+// correctly remove and reborn logs.
+// Steps:
+//  1. Deploy the Callable contract.
+//  2. Set up an event subscription.
+//  3. Save the current block which will serve as parent for the fork.
+//  4. Send a transaction.
+//  5. Check that the event was included.
+//  6. Fork by using the parent block as ancestor.
+//  7. Mine two blocks to trigger a reorg.
+//  8. Check that the event was removed.
+//  9. Re-send the transaction and mine a block.
+// 10. Check that the event was reborn.
+func TestForkLogsReborn(t *testing.T) {
+	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)
+	sim := simTestBackend(testAddr)
+	defer sim.Close()
+	// 1.
+	parsed, _ := abi.JSON(strings.NewReader(callableAbi))
+	auth, _ := bind.NewKeyedTransactorWithChainID(testKey, big.NewInt(1337))
+	_, _, contract, err := bind.DeployContract(auth, parsed, common.FromHex(callableBin), sim)
+	if err != nil {
+		t.Errorf("deploying contract: %v", err)
+	}
+	sim.Commit()
+	// 2.
+	logs, sub, err := contract.WatchLogs(nil, "Called")
+	if err != nil {
+		t.Errorf("watching logs: %v", err)
+	}
+	defer sub.Unsubscribe()
+	// 3.
+	parent := sim.blockchain.CurrentBlock()
+	// 4.
+	tx, err := contract.Transact(auth, "Call")
+	if err != nil {
+		t.Errorf("transacting: %v", err)
+	}
+	sim.Commit()
+	// 5.
+	log := <-logs
+	if log.TxHash != tx.Hash() {
+		t.Error("wrong event tx hash")
+	}
+	if log.Removed {
+		t.Error("Event should be included")
+	}
+	// 6.
+	if err := sim.Fork(context.Background(), parent.Hash()); err != nil {
+		t.Errorf("forking: %v", err)
+	}
+	// 7.
+	sim.Commit()
+	sim.Commit()
+	// 8.
+	log = <-logs
+	if log.TxHash != tx.Hash() {
+		t.Error("wrong event tx hash")
+	}
+	if !log.Removed {
+		t.Error("Event should be removed")
+	}
+	// 9.
+	if err := sim.SendTransaction(context.Background(), tx); err != nil {
+		t.Errorf("sending transaction: %v", err)
+	}
+	sim.Commit()
+	// 10.
+	log = <-logs
+	if log.TxHash != tx.Hash() {
+		t.Error("wrong event tx hash")
+	}
+	if log.Removed {
+		t.Error("Event should be included")
+	}
+}
+
+// TestForkResendTx checks that re-sending a TX after a fork
+// is possible and does not cause a "nonce mismatch" panic.
+// Steps:
+//  1. Save the current block which will serve as parent for the fork.
+//  2. Send a transaction.
+//  3. Check that the TX is included in block 1.
+//  4. Fork by using the parent block as ancestor.
+//  5. Mine a block, Re-send the transaction and mine another one.
+//  6. Check that the TX is now included in block 2.
+func TestForkResendTx(t *testing.T) {
+	testAddr := crypto.PubkeyToAddress(testKey.PublicKey)
+	sim := simTestBackend(testAddr)
+	defer sim.Close()
+	// 1.
+	parent := sim.blockchain.CurrentBlock()
+	// 2.
+	head, _ := sim.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
+	_tx := types.NewTransaction(0, testAddr, big.NewInt(1000), params.TxGas, gasPrice, nil)
+	tx, _ := types.SignTx(_tx, types.HomesteadSigner{}, testKey)
+	sim.SendTransaction(context.Background(), tx)
+	sim.Commit()
+	// 3.
+	receipt, _ := sim.TransactionReceipt(context.Background(), tx.Hash())
+	if h := receipt.BlockNumber.Uint64(); h != 1 {
+		t.Errorf("TX included in wrong block: %d", h)
+	}
+	// 4.
+	if err := sim.Fork(context.Background(), parent.Hash()); err != nil {
+		t.Errorf("forking: %v", err)
+	}
+	// 5.
+	sim.Commit()
+	if err := sim.SendTransaction(context.Background(), tx); err != nil {
+		t.Errorf("sending transaction: %v", err)
+	}
+	sim.Commit()
+	// 6.
+	receipt, _ = sim.TransactionReceipt(context.Background(), tx.Hash())
+	if h := receipt.BlockNumber.Uint64(); h != 2 {
+		t.Errorf("TX included in wrong block: %d", h)
+	}
+}
--- a/accounts/abi/bind/base.go
+++ b/accounts/abi/bind/base.go
@@ -21,6 +21,8 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
+	"strings"
+	"sync"

 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts/abi"
@@ -49,9 +51,11 @@ type TransactOpts struct {
 	Nonce  *big.Int       // Nonce to use for the transaction execution (nil = use pending state)
 	Signer SignerFn       // Method to use for signing the transaction (mandatory)

-	Value    *big.Int // Funds to transfer along the transaction (nil = 0 = no funds)
-	GasPrice *big.Int // Gas price to use for the transaction execution (nil = gas price oracle)
-	GasLimit uint64   // Gas limit to set for the transaction execution (0 = estimate)
+	Value     *big.Int // Funds to transfer along the transaction (nil = 0 = no funds)
+	GasPrice  *big.Int // Gas price to use for the transaction execution (nil = gas price oracle)
+	GasFeeCap *big.Int // Gas fee cap to use for the 1559 transaction execution (nil = gas price oracle)
+	GasTipCap *big.Int // Gas priority fee cap to use for the 1559 transaction execution (nil = gas price oracle)
+	GasLimit  uint64   // Gas limit to set for the transaction execution (0 = estimate)

 	Context context.Context // Network context to support cancellation and timeouts (nil = no timeout)

@@ -74,6 +78,29 @@ type WatchOpts struct {
 	Context context.Context // Network context to support cancellation and timeouts (nil = no timeout)
 }

+// MetaData collects all metadata for a bound contract.
+type MetaData struct {
+	mu   sync.Mutex
+	Sigs map[string]string
+	Bin  string
+	ABI  string
+	ab   *abi.ABI
+}
+
+func (m *MetaData) GetAbi() (*abi.ABI, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.ab != nil {
+		return m.ab, nil
+	}
+	if parsed, err := abi.JSON(strings.NewReader(m.ABI)); err != nil {
+		return nil, err
+	} else {
+		m.ab = &parsed
+	}
+	return m.ab, nil
+}
+
 // BoundContract is the base wrapper object that reflects a contract on the
 // Ethereum network. It contains a collection of methods that are used by the
 // higher level contract bindings to operate.
@@ -144,7 +171,10 @@ func (c *BoundContract) Call(opts *CallOpts, results *[]interface{}, method stri
 			return ErrNoPendingState
 		}
 		output, err = pb.PendingCallContract(ctx, msg)
-		if err == nil && len(output) == 0 {
+		if err != nil {
+			return err
+		}
+		if len(output) == 0 {
 			// Make sure we have a contract to operate on, and bail out otherwise.
 			if code, err = pb.PendingCodeAt(ctx, c.address); err != nil {
 				return err
@@ -204,57 +234,158 @@ func (c *BoundContract) Transfer(opts *TransactOpts) (*types.Transaction, error)
 	return c.transact(opts, &c.address, nil)
 }

-// transact executes an actual transaction invocation, first deriving any missing
-// authorization fields, and then scheduling the transaction for execution.
-func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, input []byte) (*types.Transaction, error) {
-	var err error
-
-	// Ensure a valid value field and resolve the account nonce
+func (c *BoundContract) createDynamicTx(opts *TransactOpts, contract *common.Address, input []byte, head *types.Header) (*types.Transaction, error) {
+	// Normalize value
 	value := opts.Value
 	if value == nil {
 		value = new(big.Int)
 	}
-	var nonce uint64
-	if opts.Nonce == nil {
-		nonce, err = c.transactor.PendingNonceAt(ensureContext(opts.Context), opts.From)
+	// Estimate TipCap
+	gasTipCap := opts.GasTipCap
+	if gasTipCap == nil {
+		tip, err := c.transactor.SuggestGasTipCap(ensureContext(opts.Context))
 		if err != nil {
-			return nil, fmt.Errorf("failed to retrieve account nonce: %v", err)
+			return nil, err
 		}
-	} else {
-		nonce = opts.Nonce.Uint64()
+		gasTipCap = tip
 	}
-	// Figure out the gas allowance and gas price values
+	// Estimate FeeCap
+	gasFeeCap := opts.GasFeeCap
+	if gasFeeCap == nil {
+		gasFeeCap = new(big.Int).Add(
+			gasTipCap,
+			new(big.Int).Mul(head.BaseFee, big.NewInt(2)),
+		)
+	}
+	if gasFeeCap.Cmp(gasTipCap) < 0 {
+		return nil, fmt.Errorf("maxFeePerGas (%v) < maxPriorityFeePerGas (%v)", gasFeeCap, gasTipCap)
+	}
+	// Estimate GasLimit
+	gasLimit := opts.GasLimit
+	if opts.GasLimit == 0 {
+		var err error
+		gasLimit, err = c.estimateGasLimit(opts, contract, input, nil, gasTipCap, gasFeeCap, value)
+		if err != nil {
+			return nil, err
+		}
+	}
+	// create the transaction
+	nonce, err := c.getNonce(opts)
+	if err != nil {
+		return nil, err
+	}
+	baseTx := &types.DynamicFeeTx{
+		To:        contract,
+		Nonce:     nonce,
+		GasFeeCap: gasFeeCap,
+		GasTipCap: gasTipCap,
+		Gas:       gasLimit,
+		Value:     value,
+		Data:      input,
+	}
+	return types.NewTx(baseTx), nil
+}
+
+func (c *BoundContract) createLegacyTx(opts *TransactOpts, contract *common.Address, input []byte) (*types.Transaction, error) {
+	if opts.GasFeeCap != nil || opts.GasTipCap != nil {
+		return nil, errors.New("maxFeePerGas or maxPriorityFeePerGas specified but london is not active yet")
+	}
+	// Normalize value
+	value := opts.Value
+	if value == nil {
+		value = new(big.Int)
+	}
+	// Estimate GasPrice
 	gasPrice := opts.GasPrice
 	if gasPrice == nil {
-		gasPrice, err = c.transactor.SuggestGasPrice(ensureContext(opts.Context))
+		price, err := c.transactor.SuggestGasPrice(ensureContext(opts.Context))
 		if err != nil {
-			return nil, fmt.Errorf("failed to suggest gas price: %v", err)
+			return nil, err
 		}
+		gasPrice = price
 	}
+	// Estimate GasLimit
 	gasLimit := opts.GasLimit
-	if gasLimit == 0 {
-		// Gas estimation cannot succeed without code for method invocations
-		if contract != nil {
-			if code, err := c.transactor.PendingCodeAt(ensureContext(opts.Context), c.address); err != nil {
-				return nil, err
-			} else if len(code) == 0 {
-				return nil, ErrNoCode
-			}
-		}
-		// If the contract surely has code (or code is not needed), estimate the transaction
-		msg := ethereum.CallMsg{From: opts.From, To: contract, GasPrice: gasPrice, Value: value, Data: input}
-		gasLimit, err = c.transactor.EstimateGas(ensureContext(opts.Context), msg)
+	if opts.GasLimit == 0 {
+		var err error
+		gasLimit, err = c.estimateGasLimit(opts, contract, input, gasPrice, nil, nil, value)
 		if err != nil {
-			return nil, fmt.Errorf("failed to estimate gas needed: %v", err)
+			return nil, err
 		}
 	}
-	// Create the transaction, sign it and schedule it for execution
-	var rawTx *types.Transaction
-	if contract == nil {
-		rawTx = types.NewContractCreation(nonce, value, gasLimit, gasPrice, input)
-	} else {
-		rawTx = types.NewTransaction(nonce, c.address, value, gasLimit, gasPrice, input)
+	// create the transaction
+	nonce, err := c.getNonce(opts)
+	if err != nil {
+		return nil, err
 	}
+	baseTx := &types.LegacyTx{
+		To:       contract,
+		Nonce:    nonce,
+		GasPrice: gasPrice,
+		Gas:      gasLimit,
+		Value:    value,
+		Data:     input,
+	}
+	return types.NewTx(baseTx), nil
+}
+
+func (c *BoundContract) estimateGasLimit(opts *TransactOpts, contract *common.Address, input []byte, gasPrice, gasTipCap, gasFeeCap, value *big.Int) (uint64, error) {
+	if contract != nil {
+		// Gas estimation cannot succeed without code for method invocations.
+		if code, err := c.transactor.PendingCodeAt(ensureContext(opts.Context), c.address); err != nil {
+			return 0, err
+		} else if len(code) == 0 {
+			return 0, ErrNoCode
+		}
+	}
+	msg := ethereum.CallMsg{
+		From:      opts.From,
+		To:        contract,
+		GasPrice:  gasPrice,
+		GasTipCap: gasTipCap,
+		GasFeeCap: gasFeeCap,
+		Value:     value,
+		Data:      input,
+	}
+	return c.transactor.EstimateGas(ensureContext(opts.Context), msg)
+}
+
+func (c *BoundContract) getNonce(opts *TransactOpts) (uint64, error) {
+	if opts.Nonce == nil {
+		return c.transactor.PendingNonceAt(ensureContext(opts.Context), opts.From)
+	} else {
+		return opts.Nonce.Uint64(), nil
+	}
+}
+
+// transact executes an actual transaction invocation, first deriving any missing
+// authorization fields, and then scheduling the transaction for execution.
+func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, input []byte) (*types.Transaction, error) {
+	if opts.GasPrice != nil && (opts.GasFeeCap != nil || opts.GasTipCap != nil) {
+		return nil, errors.New("both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified")
+	}
+	// Create the transaction
+	var (
+		rawTx *types.Transaction
+		err   error
+	)
+	if opts.GasPrice != nil {
+		rawTx, err = c.createLegacyTx(opts, contract, input)
+	} else {
+		// Only query for basefee if gasPrice not specified
+		if head, errHead := c.transactor.HeaderByNumber(ensureContext(opts.Context), nil); errHead != nil {
+			return nil, errHead
+		} else if head.BaseFee != nil {
+			rawTx, err = c.createDynamicTx(opts, contract, input, head)
+		} else {
+			// Chain is not London ready -> use legacy transaction
+			rawTx, err = c.createLegacyTx(opts, contract, input)
+		}
+	}
+	if err != nil {
+		return nil, err
+	}
+	// Sign the transaction and schedule it for execution
 	if opts.Signer == nil {
 		return nil, errors.New("no signer to authorize the transaction with")
 	}
@@ -353,6 +484,9 @@ func (c *BoundContract) WatchLogs(opts *WatchOpts, name string, query ...[]inter

 // UnpackLog unpacks a retrieved log into the provided output structure.
 func (c *BoundContract) UnpackLog(out interface{}, event string, log types.Log) error {
+	if log.Topics[0] != c.abi.Events[event].ID {
+		return fmt.Errorf("event signature mismatch")
+	}
 	if len(log.Data) > 0 {
 		if err := c.abi.UnpackIntoInterface(out, event, log.Data); err != nil {
 			return err
@@ -369,6 +503,9 @@ func (c *BoundContract) UnpackLog(out interface{}, event string, log types.Log)

 // UnpackLogIntoMap unpacks a retrieved log into the provided map.
 func (c *BoundContract) UnpackLogIntoMap(out map[string]interface{}, event string, log types.Log) error {
+	if log.Topics[0] != c.abi.Events[event].ID {
+		return fmt.Errorf("event signature mismatch")
+	}
 	if len(log.Data) > 0 {
 		if err := c.abi.UnpackIntoMap(out, event, log.Data); err != nil {
 			return err
@@ -387,7 +524,7 @@ func (c *BoundContract) UnpackLogIntoMap(out map[string]interface{}, event strin
 // user specified it as such.
 func ensureContext(ctx context.Context) context.Context {
 	if ctx == nil {
-		return context.TODO()
+		return context.Background()
 	}
 	return ctx
 }
--- a/accounts/abi/bind/base_test.go
+++ b/accounts/abi/bind/base_test.go
@@ -18,6 +18,7 @@ package bind_test

 import (
 	"context"
+	"errors"
 	"math/big"
 	"reflect"
 	"strings"
@@ -31,37 +32,95 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/rlp"
+	"github.com/stretchr/testify/assert"
 )

+func mockSign(addr common.Address, tx *types.Transaction) (*types.Transaction, error) { return tx, nil }
+
+type mockTransactor struct {
+	baseFee                *big.Int
+	gasTipCap              *big.Int
+	gasPrice               *big.Int
+	suggestGasTipCapCalled bool
+	suggestGasPriceCalled  bool
+}
+
+func (mt *mockTransactor) HeaderByNumber(ctx context.Context, number *big.Int) (*types.Header, error) {
+	return &types.Header{BaseFee: mt.baseFee}, nil
+}
+
+func (mt *mockTransactor) PendingCodeAt(ctx context.Context, account common.Address) ([]byte, error) {
+	return []byte{1}, nil
+}
+
+func (mt *mockTransactor) PendingNonceAt(ctx context.Context, account common.Address) (uint64, error) {
+	return 0, nil
+}
+
+func (mt *mockTransactor) SuggestGasPrice(ctx context.Context) (*big.Int, error) {
+	mt.suggestGasPriceCalled = true
+	return mt.gasPrice, nil
+}
+
+func (mt *mockTransactor) SuggestGasTipCap(ctx context.Context) (*big.Int, error) {
+	mt.suggestGasTipCapCalled = true
+	return mt.gasTipCap, nil
+}
+
+func (mt *mockTransactor) EstimateGas(ctx context.Context, call ethereum.CallMsg) (gas uint64, err error) {
+	return 0, nil
+}
+
+func (mt *mockTransactor) SendTransaction(ctx context.Context, tx *types.Transaction) error {
+	return nil
+}
+
 type mockCaller struct {
-	codeAtBlockNumber         *big.Int
-	callContractBlockNumber   *big.Int
-	pendingCodeAtCalled       bool
-	pendingCallContractCalled bool
+	codeAtBlockNumber       *big.Int
+	callContractBlockNumber *big.Int
+	callContractBytes       []byte
+	callContractErr         error
+	codeAtBytes             []byte
+	codeAtErr               error
 }

 func (mc *mockCaller) CodeAt(ctx context.Context, contract common.Address, blockNumber *big.Int) ([]byte, error) {
 	mc.codeAtBlockNumber = blockNumber
-	return []byte{1, 2, 3}, nil
+	return mc.codeAtBytes, mc.codeAtErr
 }

 func (mc *mockCaller) CallContract(ctx context.Context, call ethereum.CallMsg, blockNumber *big.Int) ([]byte, error) {
 	mc.callContractBlockNumber = blockNumber
-	return nil, nil
+	return mc.callContractBytes, mc.callContractErr
 }

-func (mc *mockCaller) PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error) {
+type mockPendingCaller struct {
+	*mockCaller
+	pendingCodeAtBytes        []byte
+	pendingCodeAtErr          error
+	pendingCodeAtCalled       bool
+	pendingCallContractCalled bool
+	pendingCallContractBytes  []byte
+	pendingCallContractErr    error
+}
+
+func (mc *mockPendingCaller) PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error) {
 	mc.pendingCodeAtCalled = true
-	return nil, nil
+	return mc.pendingCodeAtBytes, mc.pendingCodeAtErr
 }

-func (mc *mockCaller) PendingCallContract(ctx context.Context, call ethereum.CallMsg) ([]byte, error) {
+func (mc *mockPendingCaller) PendingCallContract(ctx context.Context, call ethereum.CallMsg) ([]byte, error) {
 	mc.pendingCallContractCalled = true
-	return nil, nil
+	return mc.pendingCallContractBytes, mc.pendingCallContractErr
 }
+
 func TestPassingBlockNumber(t *testing.T) {

-	mc := &mockCaller{}
+	mc := &mockPendingCaller{
+		mockCaller: &mockCaller{
+			codeAtBytes: []byte{1, 2, 3},
+		},
+	}

 	bc := bind.NewBoundContract(common.HexToAddress("0x0"), abi.ABI{
 		Methods: map[string]abi.Method{
@@ -110,7 +169,7 @@ const hexData = "0x000000000000000000000000376c47978271565f56deb45495afa69e59c16
 func TestUnpackIndexedStringTyLogIntoMap(t *testing.T) {
 	hash := crypto.Keccak256Hash([]byte("testName"))
 	topics := []common.Hash{
-		common.HexToHash("0x0"),
+		crypto.Keccak256Hash([]byte("received(string,address,uint256,bytes)")),
 		hash,
 	}
 	mockLog := newMockLog(topics, common.HexToHash("0x0"))
@@ -135,7 +194,7 @@ func TestUnpackIndexedSliceTyLogIntoMap(t *testing.T) {
 	}
 	hash := crypto.Keccak256Hash(sliceBytes)
 	topics := []common.Hash{
-		common.HexToHash("0x0"),
+		crypto.Keccak256Hash([]byte("received(string[],address,uint256,bytes)")),
 		hash,
 	}
 	mockLog := newMockLog(topics, common.HexToHash("0x0"))
@@ -160,7 +219,7 @@ func TestUnpackIndexedArrayTyLogIntoMap(t *testing.T) {
 	}
 	hash := crypto.Keccak256Hash(arrBytes)
 	topics := []common.Hash{
-		common.HexToHash("0x0"),
+		crypto.Keccak256Hash([]byte("received(address[2],address,uint256,bytes)")),
 		hash,
 	}
 	mockLog := newMockLog(topics, common.HexToHash("0x0"))
@@ -187,7 +246,7 @@ func TestUnpackIndexedFuncTyLogIntoMap(t *testing.T) {
 	var functionTy [24]byte
 	copy(functionTy[:], functionTyBytes[0:24])
 	topics := []common.Hash{
-		common.HexToHash("0x99b5620489b6ef926d4518936cfec15d305452712b88bd59da2d9c10fb0953e8"),
+		crypto.Keccak256Hash([]byte("received(function,address,uint256,bytes)")),
 		common.BytesToHash(functionTyBytes),
 	}
 	mockLog := newMockLog(topics, common.HexToHash("0x5c698f13940a2153440c6d19660878bc90219d9298fdcf37365aa8d88d40fc42"))
@@ -208,7 +267,7 @@ func TestUnpackIndexedBytesTyLogIntoMap(t *testing.T) {
 	bytes := []byte{1, 2, 3, 4, 5}
 	hash := crypto.Keccak256Hash(bytes)
 	topics := []common.Hash{
-		common.HexToHash("0x99b5620489b6ef926d4518936cfec15d305452712b88bd59da2d9c10fb0953e8"),
+		crypto.Keccak256Hash([]byte("received(bytes,address,uint256,bytes)")),
 		hash,
 	}
 	mockLog := newMockLog(topics, common.HexToHash("0x5c698f13940a2153440c6d19660878bc90219d9298fdcf37365aa8d88d40fc42"))
@@ -226,6 +285,51 @@ func TestUnpackIndexedBytesTyLogIntoMap(t *testing.T) {
 	unpackAndCheck(t, bc, expectedReceivedMap, mockLog)
 }

+func TestTransactGasFee(t *testing.T) {
+	assert := assert.New(t)
+
+	// GasTipCap and GasFeeCap
+	// When opts.GasTipCap and opts.GasFeeCap are nil
+	mt := &mockTransactor{baseFee: big.NewInt(100), gasTipCap: big.NewInt(5)}
+	bc := bind.NewBoundContract(common.Address{}, abi.ABI{}, nil, mt, nil)
+	opts := &bind.TransactOpts{Signer: mockSign}
+	tx, err := bc.Transact(opts, "")
+	assert.Nil(err)
+	assert.Equal(big.NewInt(5), tx.GasTipCap())
+	assert.Equal(big.NewInt(205), tx.GasFeeCap())
+	assert.Nil(opts.GasTipCap)
+	assert.Nil(opts.GasFeeCap)
+	assert.True(mt.suggestGasTipCapCalled)
+
+	// Second call to Transact should use latest suggested GasTipCap
+	mt.gasTipCap = big.NewInt(6)
+	mt.suggestGasTipCapCalled = false
+	tx, err = bc.Transact(opts, "")
+	assert.Nil(err)
+	assert.Equal(big.NewInt(6), tx.GasTipCap())
+	assert.Equal(big.NewInt(206), tx.GasFeeCap())
+	assert.True(mt.suggestGasTipCapCalled)
+
+	// GasPrice
+	// When opts.GasPrice is nil
+	mt = &mockTransactor{gasPrice: big.NewInt(5)}
+	bc = bind.NewBoundContract(common.Address{}, abi.ABI{}, nil, mt, nil)
+	opts = &bind.TransactOpts{Signer: mockSign}
+	tx, err = bc.Transact(opts, "")
+	assert.Nil(err)
+	assert.Equal(big.NewInt(5), tx.GasPrice())
+	assert.Nil(opts.GasPrice)
+	assert.True(mt.suggestGasPriceCalled)
+
+	// Second call to Transact should use latest suggested GasPrice
+	mt.gasPrice = big.NewInt(6)
+	mt.suggestGasPriceCalled = false
+	tx, err = bc.Transact(opts, "")
+	assert.Nil(err)
+	assert.Equal(big.NewInt(6), tx.GasPrice())
+	assert.True(mt.suggestGasPriceCalled)
+}
+
 func unpackAndCheck(t *testing.T, bc *bind.BoundContract, expected map[string]interface{}, mockLog types.Log) {
 	received := make(map[string]interface{})
 	if err := bc.UnpackLogIntoMap(received, "received", mockLog); err != nil {
@@ -255,3 +359,132 @@ func newMockLog(topics []common.Hash, txHash common.Hash) types.Log {
 		Removed:     false,
 	}
 }
+
+func TestCall(t *testing.T) {
+	var method, methodWithArg = "something", "somethingArrrrg"
+	tests := []struct {
+		name, method string
+		opts         *bind.CallOpts
+		mc           bind.ContractCaller
+		results      *[]interface{}
+		wantErr      bool
+		wantErrExact error
+	}{{
+		name: "ok not pending",
+		mc: &mockCaller{
+			codeAtBytes: []byte{0},
+		},
+		method: method,
+	}, {
+		name: "ok pending",
+		mc: &mockPendingCaller{
+			pendingCodeAtBytes: []byte{0},
+		},
+		opts: &bind.CallOpts{
+			Pending: true,
+		},
+		method: method,
+	}, {
+		name:    "pack error, no method",
+		mc:      new(mockCaller),
+		method:  "else",
+		wantErr: true,
+	}, {
+		name: "interface error, pending but not a PendingContractCaller",
+		mc:   new(mockCaller),
+		opts: &bind.CallOpts{
+			Pending: true,
+		},
+		method:       method,
+		wantErrExact: bind.ErrNoPendingState,
+	}, {
+		name: "pending call canceled",
+		mc: &mockPendingCaller{
+			pendingCallContractErr: context.DeadlineExceeded,
+		},
+		opts: &bind.CallOpts{
+			Pending: true,
+		},
+		method:       method,
+		wantErrExact: context.DeadlineExceeded,
+	}, {
+		name: "pending code at error",
+		mc: &mockPendingCaller{
+			pendingCodeAtErr: errors.New(""),
+		},
+		opts: &bind.CallOpts{
+			Pending: true,
+		},
+		method:  method,
+		wantErr: true,
+	}, {
+		name: "no pending code at",
+		mc:   new(mockPendingCaller),
+		opts: &bind.CallOpts{
+			Pending: true,
+		},
+		method:       method,
+		wantErrExact: bind.ErrNoCode,
+	}, {
+		name: "call contract error",
+		mc: &mockCaller{
+			callContractErr: context.DeadlineExceeded,
+		},
+		method:       method,
+		wantErrExact: context.DeadlineExceeded,
+	}, {
+		name: "code at error",
+		mc: &mockCaller{
+			codeAtErr: errors.New(""),
+		},
+		method:  method,
+		wantErr: true,
+	}, {
+		name:         "no code at",
+		mc:           new(mockCaller),
+		method:       method,
+		wantErrExact: bind.ErrNoCode,
+	}, {
+		name: "unpack error missing arg",
+		mc: &mockCaller{
+			codeAtBytes: []byte{0},
+		},
+		method:  methodWithArg,
+		wantErr: true,
+	}, {
+		name: "interface unpack error",
+		mc: &mockCaller{
+			codeAtBytes: []byte{0},
+		},
+		method:  method,
+		results: &[]interface{}{0},
+		wantErr: true,
+	}}
+	for _, test := range tests {
+		bc := bind.NewBoundContract(common.HexToAddress("0x0"), abi.ABI{
+			Methods: map[string]abi.Method{
+				method: {
+					Name:    method,
+					Outputs: abi.Arguments{},
+				},
+				methodWithArg: {
+					Name:    methodWithArg,
+					Outputs: abi.Arguments{abi.Argument{}},
+				},
+			},
+		}, test.mc, nil, nil)
+		err := bc.Call(test.opts, test.results, test.method)
+		if test.wantErr || test.wantErrExact != nil {
+			if err == nil {
+				t.Fatalf("%q expected error", test.name)
+			}
+			if test.wantErrExact != nil && !errors.Is(err, test.wantErrExact) {
+				t.Fatalf("%q expected error %q but got %q", test.name, test.wantErrExact, err)
+			}
+			continue
+		}
+		if err != nil {
+			t.Fatalf("%q unexpected error: %v", test.name, err)
+		}
+	}
+}
--- a/accounts/abi/bind/bind.go
+++ b/accounts/abi/bind/bind.go
@@ -88,6 +88,13 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 			transactIdentifiers = make(map[string]bool)
 			eventIdentifiers    = make(map[string]bool)
 		)
+
+		for _, input := range evmABI.Constructor.Inputs {
+			if hasStruct(input.Type) {
+				bindStructType[lang](input.Type, structs)
+			}
+		}
+
 		for _, original := range evmABI.Methods {
 			// Normalize the method for capital cases and non-anonymous inputs/outputs
 			normalized := original
@@ -172,7 +179,7 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]

 		contracts[types[i]] = &tmplContract{
 			Type:        capitalise(types[i]),
-			InputABI:    strings.Replace(strippedABI, "\"", "\\\"", -1),
+			InputABI:    strings.ReplaceAll(strippedABI, "\"", "\\\""),
 			InputBin:    strings.TrimPrefix(strings.TrimSpace(bytecodes[i]), "0x"),
 			Constructor: evmABI.Constructor,
 			Calls:       calls,
--- a/accounts/abi/bind/bind_test.go
+++ b/accounts/abi/bind/bind_test.go
@@ -18,7 +18,6 @@ package bind

 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -298,7 +297,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			// Deploy an interaction tester contract and call a transaction on it
@@ -353,7 +352,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			// Deploy a tuple tester contract and execute a structured call on it
@@ -399,7 +398,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			// Deploy a tuple tester contract and execute a structured call on it
@@ -457,7 +456,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			// Deploy a slice tester contract and execute a n array call on it
@@ -505,7 +504,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			// Deploy a default method invoker contract and execute its default method
@@ -571,7 +570,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
 		
-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()
 		
 			// Deploy a structs method invoker contract and execute its default method
@@ -703,7 +702,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			// Deploy a funky gas pattern contract
@@ -753,7 +752,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			// Deploy a sender tester contract and execute a structured call on it
@@ -828,7 +827,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			// Deploy a underscorer tester contract and execute a structured call on it
@@ -922,7 +921,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			// Deploy an eventer contract
@@ -1112,7 +1111,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			//deploy the test contract
@@ -1247,7 +1246,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			_, _, contract, err := DeployTuple(auth, sim)
@@ -1389,7 +1388,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			//deploy the test contract
@@ -1454,7 +1453,7 @@ var bindTests = []struct {
 		// Initialize test accounts
 		key, _ := crypto.GenerateKey()
 		auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
-		sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+		sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 		defer sim.Close()

 		// deploy the test contract
@@ -1544,7 +1543,7 @@ var bindTests = []struct {
 		addr := crypto.PubkeyToAddress(key.PublicKey)

 		// Deploy registrar contract
-		sim := backends.NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(1000000000)}}, 10000000)
+		sim := backends.NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 		defer sim.Close()

 		transactOpts, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
@@ -1606,7 +1605,7 @@ var bindTests = []struct {
 		addr := crypto.PubkeyToAddress(key.PublicKey)

 		// Deploy registrar contract
-		sim := backends.NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(1000000000)}}, 10000000)
+		sim := backends.NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 		defer sim.Close()

 		transactOpts, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
@@ -1668,7 +1667,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000000000)}}, 10000000)
 			defer sim.Close()

 			// Deploy a tester contract and execute a structured call on it
@@ -1728,7 +1727,7 @@ var bindTests = []struct {
 			key, _ := crypto.GenerateKey()
 			addr := crypto.PubkeyToAddress(key.PublicKey)
 	
-			sim := backends.NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(1000000000)}}, 1000000)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(10000000000000000)}}, 1000000)
 			defer sim.Close()
 	
 			opts, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
@@ -1785,6 +1784,176 @@ var bindTests = []struct {
 		nil,
 		nil,
 	},
+	// Test resolving single struct argument
+	{
+		`NewSingleStructArgument`,
+		`
+		 pragma solidity ^0.8.0;
+
+		 contract NewSingleStructArgument {
+			 struct MyStruct{
+				 uint256 a;
+				 uint256 b;
+			 }
+			 event StructEvent(MyStruct s);
+			 function TestEvent() public {
+				 emit StructEvent(MyStruct({a: 1, b: 2}));
+			 }
+		 }
+	   `,
+		[]string{"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"},
+		[]string{`[{"anonymous":false,"inputs":[{"components":[{"internalType":"uint256","name":"a","type":"uint256"},{"internalType":"uint256","name":"b","type":"uint256"}],"indexed":false,"internalType":"struct Test.MyStruct","name":"s","type":"tuple"}],"name":"StructEvent","type":"event"},{"inputs":[],"name":"TestEvent","outputs":[],"stateMutability":"nonpayable","type":"function"}]`},
+		`
+			"math/big"
+
+			"github.com/ethereum/go-ethereum/accounts/abi/bind"
+			"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
+			"github.com/ethereum/go-ethereum/core"
+			"github.com/ethereum/go-ethereum/crypto"
+			"github.com/ethereum/go-ethereum/eth/ethconfig"
+	   `,
+		`
+			var (
+				key, _  = crypto.GenerateKey()
+				user, _ = bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
+				sim     = backends.NewSimulatedBackend(core.GenesisAlloc{user.From: {Balance: big.NewInt(1000000000000000000)}}, ethconfig.Defaults.Miner.GasCeil)
+			)
+			defer sim.Close()
+
+			_, _, d, err := DeployNewSingleStructArgument(user, sim)
+			if err != nil {
+				t.Fatalf("Failed to deploy contract %v", err)
+			}
+			sim.Commit()
+
+			_, err = d.TestEvent(user)
+			if err != nil {
+				t.Fatalf("Failed to call contract %v", err)
+			}
+			sim.Commit()
+
+			it, err := d.FilterStructEvent(nil)
+			if err != nil {
+				t.Fatalf("Failed to filter contract event %v", err)
+			}
+			var count int
+			for it.Next() {
+				if it.Event.S.A.Cmp(big.NewInt(1)) != 0 {
+					t.Fatal("Unexpected contract event")
+				}
+				if it.Event.S.B.Cmp(big.NewInt(2)) != 0 {
+					t.Fatal("Unexpected contract event")
+				}
+				count += 1
+			}
+			if count != 1 {
+				t.Fatal("Unexpected contract event number")
+			}
+			`,
+		nil,
+		nil,
+		nil,
+		nil,
+	},
+	// Test errors introduced in v0.8.4
+	{
+		`NewErrors`,
+		`
+		pragma solidity >0.8.4;
+	
+		contract NewErrors {
+			error MyError(uint256);
+			error MyError1(uint256);
+			error MyError2(uint256, uint256);
+			error MyError3(uint256 a, uint256 b, uint256 c);
+			function Error() public pure {
+				revert MyError3(1,2,3);
+			}
+		}
+	   `,
+		[]string{"0x6080604052348015600f57600080fd5b5060998061001e6000396000f3fe6080604052348015600f57600080fd5b506004361060285760003560e01c8063726c638214602d575b600080fd5b60336035565b005b60405163024876cd60e61b815260016004820152600260248201526003604482015260640160405180910390fdfea264697066735822122093f786a1bc60216540cd999fbb4a6109e0fef20abcff6e9107fb2817ca968f3c64736f6c63430008070033"},
+		[]string{`[{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"MyError","type":"error"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"MyError1","type":"error"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"MyError2","type":"error"},{"inputs":[{"internalType":"uint256","name":"a","type":"uint256"},{"internalType":"uint256","name":"b","type":"uint256"},{"internalType":"uint256","name":"c","type":"uint256"}],"name":"MyError3","type":"error"},{"inputs":[],"name":"Error","outputs":[],"stateMutability":"pure","type":"function"}]`},
+		`
+			"math/big"
+	
+			"github.com/ethereum/go-ethereum/accounts/abi/bind"
+			"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
+			"github.com/ethereum/go-ethereum/core"
+			"github.com/ethereum/go-ethereum/crypto"
+			"github.com/ethereum/go-ethereum/eth/ethconfig"
+	   `,
+		`
+			var (
+				key, _  = crypto.GenerateKey()
+				user, _ = bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
+				sim     = backends.NewSimulatedBackend(core.GenesisAlloc{user.From: {Balance: big.NewInt(1000000000000000000)}}, ethconfig.Defaults.Miner.GasCeil)
+			)
+			defer sim.Close()
+	
+			_, tx, contract, err := DeployNewErrors(user, sim)
+			if err != nil {
+				t.Fatal(err)
+			}
+			sim.Commit()
+			_, err = bind.WaitDeployed(nil, sim, tx)
+			if err != nil {
+				t.Error(err)
+			}
+			if err := contract.Error(new(bind.CallOpts)); err == nil {
+				t.Fatalf("expected contract to throw error")
+			}
+			// TODO (MariusVanDerWijden unpack error using abigen
+			// once that is implemented
+	   `,
+		nil,
+		nil,
+		nil,
+		nil,
+	},
+	{
+		name: `ConstructorWithStructParam`,
+		contract: `
+		pragma solidity >=0.8.0 <0.9.0;
+		
+		contract ConstructorWithStructParam {
+			struct StructType {
+				uint256 field;
+			}
+		
+			constructor(StructType memory st) {}
+		}
+		`,
+		bytecode: []string{`0x608060405234801561001057600080fd5b506040516101c43803806101c48339818101604052810190610032919061014a565b50610177565b6000604051905090565b600080fd5b600080fd5b6000601f19601f8301169050919050565b7f4e487b7100000000000000000000000000000000000000000000000000000000600052604160045260246000fd5b6100958261004c565b810181811067ffffffffffffffff821117156100b4576100b361005d565b5b80604052505050565b60006100c7610038565b90506100d3828261008c565b919050565b6000819050919050565b6100eb816100d8565b81146100f657600080fd5b50565b600081519050610108816100e2565b92915050565b60006020828403121561012457610123610047565b5b61012e60206100bd565b9050600061013e848285016100f9565b60008301525092915050565b6000602082840312156101605761015f610042565b5b600061016e8482850161010e565b91505092915050565b603f806101856000396000f3fe6080604052600080fdfea2646970667358221220cdffa667affecefac5561f65f4a4ba914204a8d4eb859d8cd426fb306e5c12a364736f6c634300080a0033`},
+		abi:      []string{`[{"inputs":[{"components":[{"internalType":"uint256","name":"field","type":"uint256"}],"internalType":"struct ConstructorWithStructParam.StructType","name":"st","type":"tuple"}],"stateMutability":"nonpayable","type":"constructor"}]`},
+		imports: `
+			"math/big"
+
+			"github.com/ethereum/go-ethereum/accounts/abi/bind"
+			"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
+			"github.com/ethereum/go-ethereum/core"
+			"github.com/ethereum/go-ethereum/crypto"
+			"github.com/ethereum/go-ethereum/eth/ethconfig"
+		`,
+		tester: `
+			var (
+				key, _  = crypto.GenerateKey()
+				user, _ = bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
+				sim     = backends.NewSimulatedBackend(core.GenesisAlloc{user.From: {Balance: big.NewInt(1000000000000000000)}}, ethconfig.Defaults.Miner.GasCeil)
+			)
+			defer sim.Close()
+
+			_, tx, _, err := DeployConstructorWithStructParam(user, sim, ConstructorWithStructParamStructType{Field: big.NewInt(42)})
+			if err != nil {
+				t.Fatalf("DeployConstructorWithStructParam() got err %v; want nil err", err)
+			}
+			sim.Commit()
+			
+			if _, err = bind.WaitDeployed(nil, sim, tx); err != nil {
+				t.Logf("Deployment tx: %+v", tx)
+				t.Errorf("bind.WaitDeployed(nil, %T, <deployment tx>) got err %v; want nil err", sim, err)
+			}
+		`,
+	},
 }

 // Tests that packages generated by the binder can be successfully compiled and
@@ -1796,34 +1965,31 @@ func TestGolangBindings(t *testing.T) {
 		t.Skip("go sdk not found for testing")
 	}
 	// Create a temporary workspace for the test suite
-	ws, err := ioutil.TempDir("", "binding-test")
-	if err != nil {
-		t.Fatalf("failed to create temporary workspace: %v", err)
-	}
-	//defer os.RemoveAll(ws)
+	ws := t.TempDir()

 	pkg := filepath.Join(ws, "bindtest")
-	if err = os.MkdirAll(pkg, 0700); err != nil {
+	if err := os.MkdirAll(pkg, 0700); err != nil {
 		t.Fatalf("failed to create package: %v", err)
 	}
 	// Generate the test suite for all the contracts
 	for i, tt := range bindTests {
-		var types []string
-		if tt.types != nil {
-			types = tt.types
-		} else {
-			types = []string{tt.name}
-		}
-		// Generate the binding and create a Go source file in the workspace
-		bind, err := Bind(types, tt.abi, tt.bytecode, tt.fsigs, "bindtest", LangGo, tt.libs, tt.aliases)
-		if err != nil {
-			t.Fatalf("test %d: failed to generate binding: %v", i, err)
-		}
-		if err = ioutil.WriteFile(filepath.Join(pkg, strings.ToLower(tt.name)+".go"), []byte(bind), 0600); err != nil {
-			t.Fatalf("test %d: failed to write binding: %v", i, err)
-		}
-		// Generate the test file with the injected test code
-		code := fmt.Sprintf(`
+		t.Run(tt.name, func(t *testing.T) {
+			var types []string
+			if tt.types != nil {
+				types = tt.types
+			} else {
+				types = []string{tt.name}
+			}
+			// Generate the binding and create a Go source file in the workspace
+			bind, err := Bind(types, tt.abi, tt.bytecode, tt.fsigs, "bindtest", LangGo, tt.libs, tt.aliases)
+			if err != nil {
+				t.Fatalf("test %d: failed to generate binding: %v", i, err)
+			}
+			if err = os.WriteFile(filepath.Join(pkg, strings.ToLower(tt.name)+".go"), []byte(bind), 0600); err != nil {
+				t.Fatalf("test %d: failed to write binding: %v", i, err)
+			}
+			// Generate the test file with the injected test code
+			code := fmt.Sprintf(`
 			package bindtest

 			import (
@@ -1835,9 +2001,10 @@ func TestGolangBindings(t *testing.T) {
 				%s
 			}
 		`, tt.imports, tt.name, tt.tester)
-		if err := ioutil.WriteFile(filepath.Join(pkg, strings.ToLower(tt.name)+"_test.go"), []byte(code), 0600); err != nil {
-			t.Fatalf("test %d: failed to write tests: %v", i, err)
-		}
+			if err := os.WriteFile(filepath.Join(pkg, strings.ToLower(tt.name)+"_test.go"), []byte(code), 0600); err != nil {
+				t.Fatalf("test %d: failed to write tests: %v", i, err)
+			}
+		})
 	}
 	// Convert the package to go modules and use the current source for go-ethereum
 	moder := exec.Command(gocmd, "mod", "init", "bindtest")
--- a/accounts/abi/bind/template.go
+++ b/accounts/abi/bind/template.go
@@ -90,6 +90,7 @@ package {{.Package}}
 import (
 	"math/big"
 	"strings"
+	"errors"

 	ethereum "github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts/abi"
@@ -101,6 +102,7 @@ import (

 // Reference imports to suppress errors if they are not otherwise used.
 var (
+	_ = errors.New
 	_ = big.NewInt
 	_ = strings.NewReader
 	_ = ethereum.NotFound
@@ -120,32 +122,48 @@ var (
 {{end}}

 {{range $contract := .Contracts}}
-	// {{.Type}}ABI is the input ABI used to generate the binding from.
-	const {{.Type}}ABI = "{{.InputABI}}"
-
-	{{if $contract.FuncSigs}}
-		// {{.Type}}FuncSigs maps the 4-byte function signature to its string representation.
-		var {{.Type}}FuncSigs = map[string]string{
+	// {{.Type}}MetaData contains all meta data concerning the {{.Type}} contract.
+	var {{.Type}}MetaData = &bind.MetaData{
+		ABI: "{{.InputABI}}",
+		{{if $contract.FuncSigs -}}
+		Sigs: map[string]string{
 			{{range $strsig, $binsig := .FuncSigs}}"{{$binsig}}": "{{$strsig}}",
 			{{end}}
-		}
+		},
+		{{end -}}
+		{{if .InputBin -}}
+		Bin: "0x{{.InputBin}}",
+		{{end}}
+	}
+	// {{.Type}}ABI is the input ABI used to generate the binding from.
+	// Deprecated: Use {{.Type}}MetaData.ABI instead.
+	var {{.Type}}ABI = {{.Type}}MetaData.ABI
+
+	{{if $contract.FuncSigs}}
+		// Deprecated: Use {{.Type}}MetaData.Sigs instead.
+		// {{.Type}}FuncSigs maps the 4-byte function signature to its string representation.
+		var {{.Type}}FuncSigs = {{.Type}}MetaData.Sigs
 	{{end}}

 	{{if .InputBin}}
 		// {{.Type}}Bin is the compiled bytecode used for deploying new contracts.
-		var {{.Type}}Bin = "0x{{.InputBin}}"
+		// Deprecated: Use {{.Type}}MetaData.Bin instead.
+		var {{.Type}}Bin = {{.Type}}MetaData.Bin

 		// Deploy{{.Type}} deploys a new Ethereum contract, binding an instance of {{.Type}} to it.
 		func Deploy{{.Type}}(auth *bind.TransactOpts, backend bind.ContractBackend {{range .Constructor.Inputs}}, {{.Name}} {{bindtype .Type $structs}}{{end}}) (common.Address, *types.Transaction, *{{.Type}}, error) {
-		  parsed, err := abi.JSON(strings.NewReader({{.Type}}ABI))
+		  parsed, err := {{.Type}}MetaData.GetAbi()
 		  if err != nil {
 		    return common.Address{}, nil, nil, err
 		  }
+		  if parsed == nil {
+			return common.Address{}, nil, nil, errors.New("GetABI returned nil")
+		  }
 		  {{range $pattern, $name := .Libraries}}
 			{{decapitalise $name}}Addr, _, _, _ := Deploy{{capitalise $name}}(auth, backend)
-			{{$contract.Type}}Bin = strings.Replace({{$contract.Type}}Bin, "__${{$pattern}}$__", {{decapitalise $name}}Addr.String()[2:], -1)
+			{{$contract.Type}}Bin = strings.ReplaceAll({{$contract.Type}}Bin, "__${{$pattern}}$__", {{decapitalise $name}}Addr.String()[2:])
 		  {{end}}
-		  address, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex({{.Type}}Bin), backend {{range .Constructor.Inputs}}, {{.Name}}{{end}})
+		  address, tx, contract, err := bind.DeployContract(auth, *parsed, common.FromHex({{.Type}}Bin), backend {{range .Constructor.Inputs}}, {{.Name}}{{end}})
 		  if err != nil {
 		    return common.Address{}, nil, nil, err
 		  }
--- a/accounts/abi/bind/util.go
+++ b/accounts/abi/bind/util.go
@@ -21,6 +21,7 @@ import (
 	"errors"
 	"time"

+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/log"
@@ -35,14 +36,16 @@ func WaitMined(ctx context.Context, b DeployBackend, tx *types.Transaction) (*ty
 	logger := log.New("hash", tx.Hash())
 	for {
 		receipt, err := b.TransactionReceipt(ctx, tx.Hash())
-		if receipt != nil {
+		if err == nil {
 			return receipt, nil
 		}
-		if err != nil {
-			logger.Trace("Receipt retrieval failed", "err", err)
-		} else {
+
+		if errors.Is(err, ethereum.NotFound) {
 			logger.Trace("Transaction not yet mined")
+		} else {
+			logger.Trace("Receipt retrieval failed", "err", err)
 		}
+
 		// Wait for the next round.
 		select {
 		case <-ctx.Done():
--- a/accounts/abi/bind/util_test.go
+++ b/accounts/abi/bind/util_test.go
@@ -56,14 +56,17 @@ func TestWaitDeployed(t *testing.T) {
 	for name, test := range waitDeployedTests {
 		backend := backends.NewSimulatedBackend(
 			core.GenesisAlloc{
-				crypto.PubkeyToAddress(testKey.PublicKey): {Balance: big.NewInt(10000000000)},
+				crypto.PubkeyToAddress(testKey.PublicKey): {Balance: big.NewInt(10000000000000000)},
 			},
 			10000000,
 		)
 		defer backend.Close()

-		// Create the transaction.
-		tx := types.NewContractCreation(0, big.NewInt(0), test.gas, big.NewInt(1), common.FromHex(test.code))
+		// Create the transaction
+		head, _ := backend.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+		gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
+		tx := types.NewContractCreation(0, big.NewInt(0), test.gas, gasPrice, common.FromHex(test.code))
 		tx, _ = types.SignTx(tx, types.HomesteadSigner{}, testKey)

 		// Wait for it to get mined in the background.
@@ -99,15 +102,18 @@ func TestWaitDeployed(t *testing.T) {
 func TestWaitDeployedCornerCases(t *testing.T) {
 	backend := backends.NewSimulatedBackend(
 		core.GenesisAlloc{
-			crypto.PubkeyToAddress(testKey.PublicKey): {Balance: big.NewInt(10000000000)},
+			crypto.PubkeyToAddress(testKey.PublicKey): {Balance: big.NewInt(10000000000000000)},
 		},
 		10000000,
 	)
 	defer backend.Close()

+	head, _ := backend.HeaderByNumber(context.Background(), nil) // Should be child's, good enough
+	gasPrice := new(big.Int).Add(head.BaseFee, big.NewInt(1))
+
 	// Create a transaction to an account.
 	code := "6060604052600a8060106000396000f360606040526008565b00"
-	tx := types.NewTransaction(0, common.HexToAddress("0x01"), big.NewInt(0), 3000000, big.NewInt(1), common.FromHex(code))
+	tx := types.NewTransaction(0, common.HexToAddress("0x01"), big.NewInt(0), 3000000, gasPrice, common.FromHex(code))
 	tx, _ = types.SignTx(tx, types.HomesteadSigner{}, testKey)
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -119,7 +125,7 @@ func TestWaitDeployedCornerCases(t *testing.T) {
 	}

 	// Create a transaction that is not mined.
-	tx = types.NewContractCreation(1, big.NewInt(0), 3000000, big.NewInt(1), common.FromHex(code))
+	tx = types.NewContractCreation(1, big.NewInt(0), 3000000, gasPrice, common.FromHex(code))
 	tx, _ = types.SignTx(tx, types.HomesteadSigner{}, testKey)

 	go func() {
--- a/accounts/abi/error.go
+++ b/accounts/abi/error.go
@@ -1,4 +1,4 @@
-// Copyright 2016 The go-ethereum Authors
+// Copyright 2021 The go-ethereum Authors
 // This file is part of the go-ethereum library.
 //
 // The go-ethereum library is free software: you can redistribute it and/or modify
@@ -17,66 +17,75 @@
 package abi

 import (
+	"bytes"
 	"errors"
 	"fmt"
-	"reflect"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
 )

-var (
-	errBadBool = errors.New("abi: improperly encoded boolean value")
-)
-
-// formatSliceString formats the reflection kind with the given slice size
-// and returns a formatted string representation.
-func formatSliceString(kind reflect.Kind, sliceSize int) string {
-	if sliceSize == -1 {
-		return fmt.Sprintf("[]%v", kind)
-	}
-	return fmt.Sprintf("[%d]%v", sliceSize, kind)
+type Error struct {
+	Name   string
+	Inputs Arguments
+	str    string
+	// Sig contains the string signature according to the ABI spec.
+	// e.g.	 event foo(uint32 a, int b) = "foo(uint32,int256)"
+	// Please note that "int" is substitute for its canonical representation "int256"
+	Sig string
+	// ID returns the canonical representation of the event's signature used by the
+	// abi definition to identify event names and types.
+	ID common.Hash
 }

-// sliceTypeCheck checks that the given slice can by assigned to the reflection
-// type in t.
-func sliceTypeCheck(t Type, val reflect.Value) error {
-	if val.Kind() != reflect.Slice && val.Kind() != reflect.Array {
-		return typeErr(formatSliceString(t.GetType().Kind(), t.Size), val.Type())
-	}
-
-	if t.T == ArrayTy && val.Len() != t.Size {
-		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), formatSliceString(val.Type().Elem().Kind(), val.Len()))
-	}
-
-	if t.Elem.T == SliceTy || t.Elem.T == ArrayTy {
-		if val.Len() > 0 {
-			return sliceTypeCheck(*t.Elem, val.Index(0))
+func NewError(name string, inputs Arguments) Error {
+	// sanitize inputs to remove inputs without names
+	// and precompute string and sig representation.
+	names := make([]string, len(inputs))
+	types := make([]string, len(inputs))
+	for i, input := range inputs {
+		if input.Name == "" {
+			inputs[i] = Argument{
+				Name:    fmt.Sprintf("arg%d", i),
+				Indexed: input.Indexed,
+				Type:    input.Type,
+			}
+		} else {
+			inputs[i] = input
 		}
+		// string representation
+		names[i] = fmt.Sprintf("%v %v", input.Type, inputs[i].Name)
+		if input.Indexed {
+			names[i] = fmt.Sprintf("%v indexed %v", input.Type, inputs[i].Name)
+		}
+		// sig representation
+		types[i] = input.Type.String()
 	}

-	if val.Type().Elem().Kind() != t.Elem.GetType().Kind() {
-		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), val.Type())
+	str := fmt.Sprintf("error %v(%v)", name, strings.Join(names, ", "))
+	sig := fmt.Sprintf("%v(%v)", name, strings.Join(types, ","))
+	id := common.BytesToHash(crypto.Keccak256([]byte(sig)))
+
+	return Error{
+		Name:   name,
+		Inputs: inputs,
+		str:    str,
+		Sig:    sig,
+		ID:     id,
 	}
-	return nil
 }

-// typeCheck checks that the given reflection value can be assigned to the reflection
-// type in t.
-func typeCheck(t Type, value reflect.Value) error {
-	if t.T == SliceTy || t.T == ArrayTy {
-		return sliceTypeCheck(t, value)
-	}
-
-	// Check base type validity. Element types will be checked later on.
-	if t.GetType().Kind() != value.Kind() {
-		return typeErr(t.GetType().Kind(), value.Kind())
-	} else if t.T == FixedBytesTy && t.Size != value.Len() {
-		return typeErr(t.GetType(), value.Type())
-	} else {
-		return nil
-	}
-
+func (e *Error) String() string {
+	return e.str
 }

-// typeErr returns a formatted type casting error.
-func typeErr(expected, got interface{}) error {
-	return fmt.Errorf("abi: cannot use %v as type %v as argument", got, expected)
+func (e *Error) Unpack(data []byte) (interface{}, error) {
+	if len(data) < 4 {
+		return "", errors.New("invalid data for unpacking")
+	}
+	if !bytes.Equal(data[:4], e.ID[:4]) {
+		return "", errors.New("invalid data for unpacking")
+	}
+	return e.Inputs.Unpack(data[4:])
 }
--- a/accounts/abi/error_handling.go
+++ b/accounts/abi/error_handling.go
@@ -0,0 +1,82 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package abi
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+)
+
+var (
+	errBadBool = errors.New("abi: improperly encoded boolean value")
+)
+
+// formatSliceString formats the reflection kind with the given slice size
+// and returns a formatted string representation.
+func formatSliceString(kind reflect.Kind, sliceSize int) string {
+	if sliceSize == -1 {
+		return fmt.Sprintf("[]%v", kind)
+	}
+	return fmt.Sprintf("[%d]%v", sliceSize, kind)
+}
+
+// sliceTypeCheck checks that the given slice can by assigned to the reflection
+// type in t.
+func sliceTypeCheck(t Type, val reflect.Value) error {
+	if val.Kind() != reflect.Slice && val.Kind() != reflect.Array {
+		return typeErr(formatSliceString(t.GetType().Kind(), t.Size), val.Type())
+	}
+
+	if t.T == ArrayTy && val.Len() != t.Size {
+		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), formatSliceString(val.Type().Elem().Kind(), val.Len()))
+	}
+
+	if t.Elem.T == SliceTy || t.Elem.T == ArrayTy {
+		if val.Len() > 0 {
+			return sliceTypeCheck(*t.Elem, val.Index(0))
+		}
+	}
+
+	if val.Type().Elem().Kind() != t.Elem.GetType().Kind() {
+		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), val.Type())
+	}
+	return nil
+}
+
+// typeCheck checks that the given reflection value can be assigned to the reflection
+// type in t.
+func typeCheck(t Type, value reflect.Value) error {
+	if t.T == SliceTy || t.T == ArrayTy {
+		return sliceTypeCheck(t, value)
+	}
+
+	// Check base type validity. Element types will be checked later on.
+	if t.GetType().Kind() != value.Kind() {
+		return typeErr(t.GetType().Kind(), value.Kind())
+	} else if t.T == FixedBytesTy && t.Size != value.Len() {
+		return typeErr(t.GetType(), value.Type())
+	} else {
+		return nil
+	}
+
+}
+
+// typeErr returns a formatted type casting error.
+func typeErr(expected, got interface{}) error {
+	return fmt.Errorf("abi: cannot use %v as type %v as argument", got, expected)
+}
--- a/accounts/abi/reflect.go
+++ b/accounts/abi/reflect.go
@@ -123,15 +123,8 @@ func set(dst, src reflect.Value) error {
 func setSlice(dst, src reflect.Value) error {
 	slice := reflect.MakeSlice(dst.Type(), src.Len(), src.Len())
 	for i := 0; i < src.Len(); i++ {
-		if src.Index(i).Kind() == reflect.Struct {
-			if err := set(slice.Index(i), src.Index(i)); err != nil {
-				return err
-			}
-		} else {
-			// e.g. [][32]uint8 to []common.Hash
-			if err := set(slice.Index(i), src.Index(i)); err != nil {
-				return err
-			}
+		if err := set(slice.Index(i), src.Index(i)); err != nil {
+			return err
 		}
 	}
 	if dst.CanSet() {
--- a/accounts/abi/selector_parser.go
+++ b/accounts/abi/selector_parser.go
@@ -0,0 +1,160 @@
+package abi
+
+import (
+	"fmt"
+)
+
+type SelectorMarshaling struct {
+	Name   string               `json:"name"`
+	Type   string               `json:"type"`
+	Inputs []ArgumentMarshaling `json:"inputs"`
+}
+
+func isDigit(c byte) bool {
+	return c >= '0' && c <= '9'
+}
+
+func isAlpha(c byte) bool {
+	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
+}
+
+func isIdentifierSymbol(c byte) bool {
+	return c == '$' || c == '_'
+}
+
+func parseToken(unescapedSelector string, isIdent bool) (string, string, error) {
+	if len(unescapedSelector) == 0 {
+		return "", "", fmt.Errorf("empty token")
+	}
+	firstChar := unescapedSelector[0]
+	position := 1
+	if !(isAlpha(firstChar) || (isIdent && isIdentifierSymbol(firstChar))) {
+		return "", "", fmt.Errorf("invalid token start: %c", firstChar)
+	}
+	for position < len(unescapedSelector) {
+		char := unescapedSelector[position]
+		if !(isAlpha(char) || isDigit(char) || (isIdent && isIdentifierSymbol(char))) {
+			break
+		}
+		position++
+	}
+	return unescapedSelector[:position], unescapedSelector[position:], nil
+}
+
+func parseIdentifier(unescapedSelector string) (string, string, error) {
+	return parseToken(unescapedSelector, true)
+}
+
+func parseElementaryType(unescapedSelector string) (string, string, error) {
+	parsedType, rest, err := parseToken(unescapedSelector, false)
+	if err != nil {
+		return "", "", fmt.Errorf("failed to parse elementary type: %v", err)
+	}
+	// handle arrays
+	for len(rest) > 0 && rest[0] == '[' {
+		parsedType = parsedType + string(rest[0])
+		rest = rest[1:]
+		for len(rest) > 0 && isDigit(rest[0]) {
+			parsedType = parsedType + string(rest[0])
+			rest = rest[1:]
+		}
+		if len(rest) == 0 || rest[0] != ']' {
+			return "", "", fmt.Errorf("failed to parse array: expected ']', got %c", unescapedSelector[0])
+		}
+		parsedType = parsedType + string(rest[0])
+		rest = rest[1:]
+	}
+	return parsedType, rest, nil
+}
+
+func parseCompositeType(unescapedSelector string) ([]interface{}, string, error) {
+	if len(unescapedSelector) == 0 || unescapedSelector[0] != '(' {
+		return nil, "", fmt.Errorf("expected '(', got %c", unescapedSelector[0])
+	}
+	parsedType, rest, err := parseType(unescapedSelector[1:])
+	if err != nil {
+		return nil, "", fmt.Errorf("failed to parse type: %v", err)
+	}
+	result := []interface{}{parsedType}
+	for len(rest) > 0 && rest[0] != ')' {
+		parsedType, rest, err = parseType(rest[1:])
+		if err != nil {
+			return nil, "", fmt.Errorf("failed to parse type: %v", err)
+		}
+		result = append(result, parsedType)
+	}
+	if len(rest) == 0 || rest[0] != ')' {
+		return nil, "", fmt.Errorf("expected ')', got '%s'", rest)
+	}
+	if len(rest) >= 3 && rest[1] == '[' && rest[2] == ']' {
+		return append(result, "[]"), rest[3:], nil
+	}
+	return result, rest[1:], nil
+}
+
+func parseType(unescapedSelector string) (interface{}, string, error) {
+	if len(unescapedSelector) == 0 {
+		return nil, "", fmt.Errorf("empty type")
+	}
+	if unescapedSelector[0] == '(' {
+		return parseCompositeType(unescapedSelector)
+	} else {
+		return parseElementaryType(unescapedSelector)
+	}
+}
+
+func assembleArgs(args []interface{}) ([]ArgumentMarshaling, error) {
+	arguments := make([]ArgumentMarshaling, 0)
+	for i, arg := range args {
+		// generate dummy name to avoid unmarshal issues
+		name := fmt.Sprintf("name%d", i)
+		if s, ok := arg.(string); ok {
+			arguments = append(arguments, ArgumentMarshaling{name, s, s, nil, false})
+		} else if components, ok := arg.([]interface{}); ok {
+			subArgs, err := assembleArgs(components)
+			if err != nil {
+				return nil, fmt.Errorf("failed to assemble components: %v", err)
+			}
+			tupleType := "tuple"
+			if len(subArgs) != 0 && subArgs[len(subArgs)-1].Type == "[]" {
+				subArgs = subArgs[:len(subArgs)-1]
+				tupleType = "tuple[]"
+			}
+			arguments = append(arguments, ArgumentMarshaling{name, tupleType, tupleType, subArgs, false})
+		} else {
+			return nil, fmt.Errorf("failed to assemble args: unexpected type %T", arg)
+		}
+	}
+	return arguments, nil
+}
+
+// ParseSelector converts a method selector into a struct that can be JSON encoded
+// and consumed by other functions in this package.
+// Note, although uppercase letters are not part of the ABI spec, this function
+// still accepts it as the general format is valid.
+func ParseSelector(unescapedSelector string) (SelectorMarshaling, error) {
+	name, rest, err := parseIdentifier(unescapedSelector)
+	if err != nil {
+		return SelectorMarshaling{}, fmt.Errorf("failed to parse selector '%s': %v", unescapedSelector, err)
+	}
+	args := []interface{}{}
+	if len(rest) >= 2 && rest[0] == '(' && rest[1] == ')' {
+		rest = rest[2:]
+	} else {
+		args, rest, err = parseCompositeType(rest)
+		if err != nil {
+			return SelectorMarshaling{}, fmt.Errorf("failed to parse selector '%s': %v", unescapedSelector, err)
+		}
+	}
+	if len(rest) > 0 {
+		return SelectorMarshaling{}, fmt.Errorf("failed to parse selector '%s': unexpected string '%s'", unescapedSelector, rest)
+	}
+
+	// Reassemble the fake ABI and constuct the JSON
+	fakeArgs, err := assembleArgs(args)
+	if err != nil {
+		return SelectorMarshaling{}, fmt.Errorf("failed to parse selector: %v", err)
+	}
+
+	return SelectorMarshaling{name, "function", fakeArgs}, nil
+}
--- a/accounts/abi/selector_parser_test.go
+++ b/accounts/abi/selector_parser_test.go
@@ -0,0 +1,63 @@
+package abi
+
+import (
+	"fmt"
+	"log"
+	"reflect"
+	"testing"
+)
+
+func TestParseSelector(t *testing.T) {
+	mkType := func(types ...interface{}) []ArgumentMarshaling {
+		var result []ArgumentMarshaling
+		for i, typeOrComponents := range types {
+			name := fmt.Sprintf("name%d", i)
+			if typeName, ok := typeOrComponents.(string); ok {
+				result = append(result, ArgumentMarshaling{name, typeName, typeName, nil, false})
+			} else if components, ok := typeOrComponents.([]ArgumentMarshaling); ok {
+				result = append(result, ArgumentMarshaling{name, "tuple", "tuple", components, false})
+			} else if components, ok := typeOrComponents.([][]ArgumentMarshaling); ok {
+				result = append(result, ArgumentMarshaling{name, "tuple[]", "tuple[]", components[0], false})
+			} else {
+				log.Fatalf("unexpected type %T", typeOrComponents)
+			}
+		}
+		return result
+	}
+	tests := []struct {
+		input string
+		name  string
+		args  []ArgumentMarshaling
+	}{
+		{"noargs()", "noargs", []ArgumentMarshaling{}},
+		{"simple(uint256,uint256,uint256)", "simple", mkType("uint256", "uint256", "uint256")},
+		{"other(uint256,address)", "other", mkType("uint256", "address")},
+		{"withArray(uint256[],address[2],uint8[4][][5])", "withArray", mkType("uint256[]", "address[2]", "uint8[4][][5]")},
+		{"singleNest(bytes32,uint8,(uint256,uint256),address)", "singleNest", mkType("bytes32", "uint8", mkType("uint256", "uint256"), "address")},
+		{"multiNest(address,(uint256[],uint256),((address,bytes32),uint256))", "multiNest",
+			mkType("address", mkType("uint256[]", "uint256"), mkType(mkType("address", "bytes32"), "uint256"))},
+		{"arrayNest((uint256,uint256)[],bytes32)", "arrayNest", mkType([][]ArgumentMarshaling{mkType("uint256", "uint256")}, "bytes32")},
+		{"multiArrayNest((uint256,uint256)[],(uint256,uint256)[])", "multiArrayNest",
+			mkType([][]ArgumentMarshaling{mkType("uint256", "uint256")}, [][]ArgumentMarshaling{mkType("uint256", "uint256")})},
+		{"singleArrayNestAndArray((uint256,uint256)[],bytes32[])", "singleArrayNestAndArray",
+			mkType([][]ArgumentMarshaling{mkType("uint256", "uint256")}, "bytes32[]")},
+		{"singleArrayNestWithArrayAndArray((uint256[],address[2],uint8[4][][5])[],bytes32[])", "singleArrayNestWithArrayAndArray",
+			mkType([][]ArgumentMarshaling{mkType("uint256[]", "address[2]", "uint8[4][][5]")}, "bytes32[]")},
+	}
+	for i, tt := range tests {
+		selector, err := ParseSelector(tt.input)
+		if err != nil {
+			t.Errorf("test %d: failed to parse selector '%v': %v", i, tt.input, err)
+		}
+		if selector.Name != tt.name {
+			t.Errorf("test %d: unexpected function name: '%s' != '%s'", i, selector.Name, tt.name)
+		}
+
+		if selector.Type != "function" {
+			t.Errorf("test %d: unexpected type: '%s' != '%s'", i, selector.Type, "function")
+		}
+		if !reflect.DeepEqual(selector.Inputs, tt.args) {
+			t.Errorf("test %d: unexpected args: '%v' != '%v'", i, selector.Inputs, tt.args)
+		}
+	}
+}
--- a/accounts/abi/type.go
+++ b/accounts/abi/type.go
@@ -201,7 +201,7 @@ func NewType(t string, internalType string, components []ArgumentMarshaling) (ty
 		if internalType != "" && strings.HasPrefix(internalType, structPrefix) {
 			// Foo.Bar type definition is not allowed in golang,
 			// convert the format to FooBar
-			typ.TupleRawName = strings.Replace(internalType[len(structPrefix):], ".", "", -1)
+			typ.TupleRawName = strings.ReplaceAll(internalType[len(structPrefix):], ".", "")
 		}

 	case "function":
--- a/accounts/abi/unpack.go
+++ b/accounts/abi/unpack.go
@@ -290,7 +290,7 @@ func tuplePointsTo(index int, output []byte) (start int, err error) {
 	offset := big.NewInt(0).SetBytes(output[index : index+32])
 	outputLen := big.NewInt(int64(len(output)))

-	if offset.Cmp(big.NewInt(int64(len(output)))) > 0 {
+	if offset.Cmp(outputLen) > 0 {
 		return 0, fmt.Errorf("abi: cannot marshal in to go slice: offset %v would go over slice boundary (len=%v)", offset, outputLen)
 	}
 	if offset.BitLen() > 63 {
--- a/accounts/abi/unpack_test.go
+++ b/accounts/abi/unpack_test.go
@@ -201,6 +201,23 @@ var unpackTests = []unpackTest{
 			IntOne *big.Int
 		}{big.NewInt(1)},
 	},
+	{
+		def:  `[{"type":"bool"}]`,
+		enc:  "",
+		want: false,
+		err:  "abi: attempting to unmarshall an empty string while arguments are expected",
+	},
+	{
+		def:  `[{"type":"bytes32","indexed":true},{"type":"uint256","indexed":false}]`,
+		enc:  "",
+		want: false,
+		err:  "abi: attempting to unmarshall an empty string while arguments are expected",
+	},
+	{
+		def:  `[{"type":"bool","indexed":true},{"type":"uint64","indexed":true}]`,
+		enc:  "",
+		want: false,
+	},
 }

 // TestLocalUnpackTests runs test specially designed only for unpacking.
@@ -762,20 +779,24 @@ func TestUnpackTuple(t *testing.T) {
 	buff.Write(common.Hex2Bytes("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")) // ret[b] = -1

 	// If the result is single tuple, use struct as return value container directly.
-	v := struct {
+	type v struct {
 		A *big.Int
 		B *big.Int
-	}{new(big.Int), new(big.Int)}
+	}
+	type r struct {
+		Result v
+	}
+	var ret0 = new(r)
+	err = abi.UnpackIntoInterface(ret0, "tuple", buff.Bytes())

-	err = abi.UnpackIntoInterface(&v, "tuple", buff.Bytes())
 	if err != nil {
 		t.Error(err)
 	} else {
-		if v.A.Cmp(big.NewInt(1)) != 0 {
-			t.Errorf("unexpected value unpacked: want %x, got %x", 1, v.A)
+		if ret0.Result.A.Cmp(big.NewInt(1)) != 0 {
+			t.Errorf("unexpected value unpacked: want %x, got %x", 1, ret0.Result.A)
 		}
-		if v.B.Cmp(big.NewInt(-1)) != 0 {
-			t.Errorf("unexpected value unpacked: want %x, got %x", -1, v.B)
+		if ret0.Result.B.Cmp(big.NewInt(-1)) != 0 {
+			t.Errorf("unexpected value unpacked: want %x, got %x", -1, ret0.Result.B)
 		}
 	}

--- a/accounts/accounts.go
+++ b/accounts/accounts.go
@@ -46,7 +46,7 @@ const (
 // accounts (derived from the same seed).
 type Wallet interface {
 	// URL retrieves the canonical path under which this wallet is reachable. It is
-	// user by upper layers to define a sorting order over all wallets from multiple
+	// used by upper layers to define a sorting order over all wallets from multiple
 	// backends.
 	URL() URL

@@ -89,7 +89,7 @@ type Wallet interface {
 	// accounts.
 	//
 	// Note, self derivation will increment the last component of the specified path
-	// opposed to decending into a child path to allow discovering accounts starting
+	// opposed to descending into a child path to allow discovering accounts starting
 	// from non zero components.
 	//
 	// Some hardware wallets switched derivation paths through their evolution, so
@@ -105,7 +105,7 @@ type Wallet interface {
 	// or optionally with the aid of any location metadata from the embedded URL field.
 	//
 	// If the wallet requires additional authentication to sign the request (e.g.
-	// a password to decrypt the account, or a PIN code o verify the transaction),
+	// a password to decrypt the account, or a PIN code to verify the transaction),
 	// an AuthNeededError instance will be returned, containing infos for the user
 	// about which fields or actions are needed. The user may retry by providing
 	// the needed details via SignDataWithPassphrase, or by other means (e.g. unlock
@@ -124,13 +124,13 @@ type Wallet interface {
 	// or optionally with the aid of any location metadata from the embedded URL field.
 	//
 	// If the wallet requires additional authentication to sign the request (e.g.
-	// a password to decrypt the account, or a PIN code o verify the transaction),
+	// a password to decrypt the account, or a PIN code to verify the transaction),
 	// an AuthNeededError instance will be returned, containing infos for the user
 	// about which fields or actions are needed. The user may retry by providing
 	// the needed details via SignTextWithPassphrase, or by other means (e.g. unlock
 	// the account in a keystore).
 	//
-	// This method should return the signature in 'canonical' format, with v 0 or 1
+	// This method should return the signature in 'canonical' format, with v 0 or 1.
 	SignText(account Account, text []byte) ([]byte, error)

 	// SignTextWithPassphrase is identical to Signtext, but also takes a password
@@ -176,7 +176,7 @@ type Backend interface {
 // TextHash is a helper function that calculates a hash for the given message that can be
 // safely used to calculate a signature from.
 //
-// The hash is calulcated as
+// The hash is calculated as
 //   keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
 //
 // This gives context to the signed message and prevents signing of transactions.
@@ -188,7 +188,7 @@ func TextHash(data []byte) []byte {
 // TextAndHash is a helper function that calculates a hash for the given message that can be
 // safely used to calculate a signature from.
 //
-// The hash is calulcated as
+// The hash is calculated as
 //   keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
 //
 // This gives context to the signed message and prevents signing of transactions.
--- a/accounts/errors.go
+++ b/accounts/errors.go
@@ -41,8 +41,7 @@ var ErrInvalidPassphrase = errors.New("invalid password")
 // second time.
 var ErrWalletAlreadyOpen = errors.New("wallet already open")

-// ErrWalletClosed is returned if a wallet is attempted to be opened the
-// secodn time.
+// ErrWalletClosed is returned if a wallet is offline.
 var ErrWalletClosed = errors.New("wallet closed")

 // AuthNeededError is returned by backends for signing requests where the user
--- a/accounts/external/backend.go
+++ b/accounts/external/backend.go
@@ -29,7 +29,7 @@ import (
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/rpc"
-	"github.com/ethereum/go-ethereum/signer/core"
+	"github.com/ethereum/go-ethereum/signer/core/apitypes"
 )

 type ExternalBackend struct {
@@ -196,6 +196,10 @@ type signTransactionResult struct {
 	Tx  *types.Transaction `json:"tx"`
 }

+// SignTx sends the transaction to the external signer.
+// If chainID is nil, or tx.ChainID is zero, the chain ID will be assigned
+// by the external signer. For non-legacy transactions, the chain ID of the
+// transaction overrides the chainID parameter.
 func (api *ExternalSigner) SignTx(account accounts.Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) {
 	data := hexutil.Bytes(tx.Data())
 	var to *common.MixedcaseAddress
@@ -203,26 +207,34 @@ func (api *ExternalSigner) SignTx(account accounts.Account, tx *types.Transactio
 		t := common.NewMixedcaseAddress(*tx.To())
 		to = &t
 	}
-	args := &core.SendTxArgs{
-		Data:     &data,
-		Nonce:    hexutil.Uint64(tx.Nonce()),
-		Value:    hexutil.Big(*tx.Value()),
-		Gas:      hexutil.Uint64(tx.Gas()),
-		GasPrice: hexutil.Big(*tx.GasPrice()),
-		To:       to,
-		From:     common.NewMixedcaseAddress(account.Address),
+	args := &apitypes.SendTxArgs{
+		Data:  &data,
+		Nonce: hexutil.Uint64(tx.Nonce()),
+		Value: hexutil.Big(*tx.Value()),
+		Gas:   hexutil.Uint64(tx.Gas()),
+		To:    to,
+		From:  common.NewMixedcaseAddress(account.Address),
+	}
+	switch tx.Type() {
+	case types.LegacyTxType, types.AccessListTxType:
+		args.GasPrice = (*hexutil.Big)(tx.GasPrice())
+	case types.DynamicFeeTxType:
+		args.MaxFeePerGas = (*hexutil.Big)(tx.GasFeeCap())
+		args.MaxPriorityFeePerGas = (*hexutil.Big)(tx.GasTipCap())
+	default:
+		return nil, fmt.Errorf("unsupported tx type %d", tx.Type())
 	}
 	// We should request the default chain id that we're operating with
 	// (the chain we're executing on)
-	if chainID != nil {
+	if chainID != nil && chainID.Sign() != 0 {
 		args.ChainID = (*hexutil.Big)(chainID)
 	}
-	// However, if the user asked for a particular chain id, then we should
-	// use that instead.
-	if tx.Type() != types.LegacyTxType && tx.ChainId() != nil {
-		args.ChainID = (*hexutil.Big)(tx.ChainId())
-	}
-	if tx.Type() == types.AccessListTxType {
+	if tx.Type() != types.LegacyTxType {
+		// However, if the user asked for a particular chain id, then we should
+		// use that instead.
+		if tx.ChainId().Sign() != 0 {
+			args.ChainID = (*hexutil.Big)(tx.ChainId())
+		}
 		accessList := tx.AccessList()
 		args.AccessList = &accessList
 	}
--- a/accounts/hd.go
+++ b/accounts/hd.go
@@ -41,7 +41,7 @@ var DefaultBaseDerivationPath = DerivationPath{0x80000000 + 44, 0x80000000 + 60,
 var LegacyLedgerBaseDerivationPath = DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0}

 // DerivationPath represents the computer friendly version of a hierarchical
-// deterministic wallet account derivaion path.
+// deterministic wallet account derivation path.
 //
 // The BIP-32 spec https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
 // defines derivation paths to be of the form:
--- a/accounts/keystore/account_cache_test.go
+++ b/accounts/keystore/account_cache_test.go
@@ -18,7 +18,6 @@ package keystore

 import (
 	"fmt"
-	"io/ioutil"
 	"math/rand"
 	"os"
 	"path/filepath"
@@ -55,7 +54,6 @@ func TestWatchNewFile(t *testing.T) {
 	t.Parallel()

 	dir, ks := tmpKeyStore(t, false)
-	defer os.RemoveAll(dir)

 	// Ensure the watcher is started before adding any files.
 	ks.Accounts()
@@ -96,7 +94,7 @@ func TestWatchNoDir(t *testing.T) {

 	// Create ks but not the directory that it watches.
 	rand.Seed(time.Now().UnixNano())
-	dir := filepath.Join(os.TempDir(), fmt.Sprintf("eth-keystore-watch-test-%d-%d", os.Getpid(), rand.Int()))
+	dir := filepath.Join(os.TempDir(), fmt.Sprintf("eth-keystore-watchnodir-test-%d-%d", os.Getpid(), rand.Int()))
 	ks := NewKeyStore(dir, LightScryptN, LightScryptP)

 	list := ks.Accounts()
@@ -322,7 +320,7 @@ func TestUpdatedKeyfileContents(t *testing.T) {

 	// Create a temporary kesytore to test with
 	rand.Seed(time.Now().UnixNano())
-	dir := filepath.Join(os.TempDir(), fmt.Sprintf("eth-keystore-watch-test-%d-%d", os.Getpid(), rand.Int()))
+	dir := filepath.Join(os.TempDir(), fmt.Sprintf("eth-keystore-updatedkeyfilecontents-test-%d-%d", os.Getpid(), rand.Int()))
 	ks := NewKeyStore(dir, LightScryptN, LightScryptP)

 	list := ks.Accounts()
@@ -381,11 +379,11 @@ func TestUpdatedKeyfileContents(t *testing.T) {
 		return
 	}

-	// needed so that modTime of `file` is different to its current value after ioutil.WriteFile
+	// needed so that modTime of `file` is different to its current value after os.WriteFile
 	time.Sleep(1000 * time.Millisecond)

 	// Now replace file contents with crap
-	if err := ioutil.WriteFile(file, []byte("foo"), 0644); err != nil {
+	if err := os.WriteFile(file, []byte("foo"), 0644); err != nil {
 		t.Fatal(err)
 		return
 	}
@@ -398,9 +396,9 @@ func TestUpdatedKeyfileContents(t *testing.T) {

 // forceCopyFile is like cp.CopyFile, but doesn't complain if the destination exists.
 func forceCopyFile(dst, src string) error {
-	data, err := ioutil.ReadFile(src)
+	data, err := os.ReadFile(src)
 	if err != nil {
 		return err
 	}
-	return ioutil.WriteFile(dst, data, 0644)
+	return os.WriteFile(dst, data, 0644)
 }
--- a/accounts/keystore/file_cache.go
+++ b/accounts/keystore/file_cache.go
@@ -17,7 +17,6 @@
 package keystore

 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -41,7 +40,7 @@ func (fc *fileCache) scan(keyDir string) (mapset.Set, mapset.Set, mapset.Set, er
 	t0 := time.Now()

 	// List all the failes from the keystore folder
-	files, err := ioutil.ReadDir(keyDir)
+	files, err := os.ReadDir(keyDir)
 	if err != nil {
 		return nil, nil, nil, err
 	}
@@ -65,7 +64,11 @@ func (fc *fileCache) scan(keyDir string) (mapset.Set, mapset.Set, mapset.Set, er
 		// Gather the set of all and fresly modified files
 		all.Add(path)

-		modified := fi.ModTime()
+		info, err := fi.Info()
+		if err != nil {
+			return nil, nil, nil, err
+		}
+		modified := info.ModTime()
 		if modified.After(fc.lastMod) {
 			mods.Add(path)
 		}
@@ -89,13 +92,13 @@ func (fc *fileCache) scan(keyDir string) (mapset.Set, mapset.Set, mapset.Set, er
 }

 // nonKeyFile ignores editor backups, hidden files and folders/symlinks.
-func nonKeyFile(fi os.FileInfo) bool {
+func nonKeyFile(fi os.DirEntry) bool {
 	// Skip editor backups and UNIX-style hidden files.
 	if strings.HasSuffix(fi.Name(), "~") || strings.HasPrefix(fi.Name(), ".") {
 		return true
 	}
 	// Skip misc special files, directories (yes, symlinks too).
-	if fi.IsDir() || fi.Mode()&os.ModeType != 0 {
+	if fi.IsDir() || !fi.Type().IsRegular() {
 		return true
 	}
 	return false
--- a/accounts/keystore/key.go
+++ b/accounts/keystore/key.go
@@ -23,7 +23,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -197,7 +196,7 @@ func writeTemporaryKeyFile(file string, content []byte) (string, error) {
 	}
 	// Atomic write: create a temporary hidden file first
 	// then move it into place. TempFile assigns mode 0600.
-	f, err := ioutil.TempFile(filepath.Dir(file), "."+filepath.Base(file)+".tmp")
+	f, err := os.CreateTemp(filepath.Dir(file), "."+filepath.Base(file)+".tmp")
 	if err != nil {
 		return "", err
 	}
--- a/accounts/keystore/keystore_test.go
+++ b/accounts/keystore/keystore_test.go
@@ -17,7 +17,6 @@
 package keystore

 import (
-	"io/ioutil"
 	"math/rand"
 	"os"
 	"runtime"
@@ -38,7 +37,6 @@ var testSigData = make([]byte, 32)

 func TestKeyStore(t *testing.T) {
 	dir, ks := tmpKeyStore(t, true)
-	defer os.RemoveAll(dir)

 	a, err := ks.NewAccount("foo")
 	if err != nil {
@@ -72,8 +70,7 @@ func TestKeyStore(t *testing.T) {
 }

 func TestSign(t *testing.T) {
-	dir, ks := tmpKeyStore(t, true)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStore(t, true)

 	pass := "" // not used but required by API
 	a1, err := ks.NewAccount(pass)
@@ -89,8 +86,7 @@ func TestSign(t *testing.T) {
 }

 func TestSignWithPassphrase(t *testing.T) {
-	dir, ks := tmpKeyStore(t, true)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStore(t, true)

 	pass := "passwd"
 	acc, err := ks.NewAccount(pass)
@@ -117,8 +113,7 @@ func TestSignWithPassphrase(t *testing.T) {
 }

 func TestTimedUnlock(t *testing.T) {
-	dir, ks := tmpKeyStore(t, true)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStore(t, true)

 	pass := "foo"
 	a1, err := ks.NewAccount(pass)
@@ -152,8 +147,7 @@ func TestTimedUnlock(t *testing.T) {
 }

 func TestOverrideUnlock(t *testing.T) {
-	dir, ks := tmpKeyStore(t, false)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStore(t, false)

 	pass := "foo"
 	a1, err := ks.NewAccount(pass)
@@ -193,8 +187,7 @@ func TestOverrideUnlock(t *testing.T) {

 // This test should fail under -race if signing races the expiration goroutine.
 func TestSignRace(t *testing.T) {
-	dir, ks := tmpKeyStore(t, false)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStore(t, false)

 	// Create a test account.
 	a1, err := ks.NewAccount("")
@@ -222,8 +215,7 @@ func TestSignRace(t *testing.T) {
 // addition and removal of wallet event subscriptions.
 func TestWalletNotifierLifecycle(t *testing.T) {
 	// Create a temporary kesytore to test with
-	dir, ks := tmpKeyStore(t, false)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStore(t, false)

 	// Ensure that the notification updater is not running yet
 	time.Sleep(250 * time.Millisecond)
@@ -283,8 +275,7 @@ type walletEvent struct {
 // Tests that wallet notifications and correctly fired when accounts are added
 // or deleted from the keystore.
 func TestWalletNotifications(t *testing.T) {
-	dir, ks := tmpKeyStore(t, false)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStore(t, false)

 	// Subscribe to the wallet feed and collect events.
 	var (
@@ -345,8 +336,7 @@ func TestWalletNotifications(t *testing.T) {

 // TestImportExport tests the import functionality of a keystore.
 func TestImportECDSA(t *testing.T) {
-	dir, ks := tmpKeyStore(t, true)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStore(t, true)
 	key, err := crypto.GenerateKey()
 	if err != nil {
 		t.Fatalf("failed to generate key: %v", key)
@@ -364,8 +354,7 @@ func TestImportECDSA(t *testing.T) {

 // TestImportECDSA tests the import and export functionality of a keystore.
 func TestImportExport(t *testing.T) {
-	dir, ks := tmpKeyStore(t, true)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStore(t, true)
 	acc, err := ks.NewAccount("old")
 	if err != nil {
 		t.Fatalf("failed to create account: %v", acc)
@@ -374,8 +363,7 @@ func TestImportExport(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to export account: %v", acc)
 	}
-	dir2, ks2 := tmpKeyStore(t, true)
-	defer os.RemoveAll(dir2)
+	_, ks2 := tmpKeyStore(t, true)
 	if _, err = ks2.Import(json, "old", "old"); err == nil {
 		t.Errorf("importing with invalid password succeeded")
 	}
@@ -395,8 +383,7 @@ func TestImportExport(t *testing.T) {
 // TestImportRace tests the keystore on races.
 // This test should fail under -race if importing races.
 func TestImportRace(t *testing.T) {
-	dir, ks := tmpKeyStore(t, true)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStore(t, true)
 	acc, err := ks.NewAccount("old")
 	if err != nil {
 		t.Fatalf("failed to create account: %v", acc)
@@ -405,8 +392,7 @@ func TestImportRace(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to export account: %v", acc)
 	}
-	dir2, ks2 := tmpKeyStore(t, true)
-	defer os.RemoveAll(dir2)
+	_, ks2 := tmpKeyStore(t, true)
 	var atom uint32
 	var wg sync.WaitGroup
 	wg.Add(2)
@@ -462,10 +448,7 @@ func checkEvents(t *testing.T, want []walletEvent, have []walletEvent) {
 }

 func tmpKeyStore(t *testing.T, encrypted bool) (string, *KeyStore) {
-	d, err := ioutil.TempDir("", "eth-keystore-test")
-	if err != nil {
-		t.Fatal(err)
-	}
+	d := t.TempDir()
 	newKs := NewPlaintextKeyStore
 	if encrypted {
 		newKs = func(kd string) *KeyStore { return NewKeyStore(kd, veryLightScryptN, veryLightScryptP) }
--- a/accounts/keystore/passphrase.go
+++ b/accounts/keystore/passphrase.go
@@ -34,7 +34,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"

@@ -82,7 +81,7 @@ type keyStorePassphrase struct {

 func (ks keyStorePassphrase) GetKey(addr common.Address, filename, auth string) (*Key, error) {
 	// Load the key from the keystore and decrypt its contents
-	keyjson, err := ioutil.ReadFile(filename)
+	keyjson, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}
--- a/accounts/keystore/passphrase_test.go
+++ b/accounts/keystore/passphrase_test.go
@@ -17,7 +17,7 @@
 package keystore

 import (
-	"io/ioutil"
+	"os"
 	"testing"

 	"github.com/ethereum/go-ethereum/common"
@@ -30,7 +30,7 @@ const (

 // Tests that a json key file can be decrypted and encrypted in multiple rounds.
 func TestKeyEncryptDecrypt(t *testing.T) {
-	keyjson, err := ioutil.ReadFile("testdata/very-light-scrypt.json")
+	keyjson, err := os.ReadFile("testdata/very-light-scrypt.json")
 	if err != nil {
 		t.Fatal(err)
 	}
--- a/accounts/keystore/plain_test.go
+++ b/accounts/keystore/plain_test.go
@@ -20,8 +20,6 @@ import (
 	"crypto/rand"
 	"encoding/hex"
 	"fmt"
-	"io/ioutil"
-	"os"
 	"path/filepath"
 	"reflect"
 	"strings"
@@ -32,10 +30,7 @@ import (
 )

 func tmpKeyStoreIface(t *testing.T, encrypted bool) (dir string, ks keyStore) {
-	d, err := ioutil.TempDir("", "geth-keystore-test")
-	if err != nil {
-		t.Fatal(err)
-	}
+	d := t.TempDir()
 	if encrypted {
 		ks = &keyStorePassphrase{d, veryLightScryptN, veryLightScryptP, true}
 	} else {
@@ -45,8 +40,7 @@ func tmpKeyStoreIface(t *testing.T, encrypted bool) (dir string, ks keyStore) {
 }

 func TestKeyStorePlain(t *testing.T) {
-	dir, ks := tmpKeyStoreIface(t, false)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStoreIface(t, false)

 	pass := "" // not used but required by API
 	k1, account, err := storeNewKey(ks, rand.Reader, pass)
@@ -66,8 +60,7 @@ func TestKeyStorePlain(t *testing.T) {
 }

 func TestKeyStorePassphrase(t *testing.T) {
-	dir, ks := tmpKeyStoreIface(t, true)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStoreIface(t, true)

 	pass := "foo"
 	k1, account, err := storeNewKey(ks, rand.Reader, pass)
@@ -87,8 +80,7 @@ func TestKeyStorePassphrase(t *testing.T) {
 }

 func TestKeyStorePassphraseDecryptionFail(t *testing.T) {
-	dir, ks := tmpKeyStoreIface(t, true)
-	defer os.RemoveAll(dir)
+	_, ks := tmpKeyStoreIface(t, true)

 	pass := "foo"
 	k1, account, err := storeNewKey(ks, rand.Reader, pass)
@@ -102,7 +94,6 @@ func TestKeyStorePassphraseDecryptionFail(t *testing.T) {

 func TestImportPreSaleKey(t *testing.T) {
 	dir, ks := tmpKeyStoreIface(t, true)
-	defer os.RemoveAll(dir)

 	// file content of a presale key file generated with:
 	// python pyethsaletool.py genwallet
--- a/accounts/keystore/watch.go
+++ b/accounts/keystore/watch.go
@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

+//go:build (darwin && !ios && cgo) || freebsd || (linux && !arm64) || netbsd || solaris
 // +build darwin,!ios,cgo freebsd linux,!arm64 netbsd solaris

 package keystore
--- a/accounts/keystore/watch_fallback.go
+++ b/accounts/keystore/watch_fallback.go
@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

+//go:build (darwin && !cgo) || ios || (linux && arm64) || windows || (!darwin && !freebsd && !linux && !netbsd && !solaris)
 // +build darwin,!cgo ios linux,arm64 windows !darwin,!freebsd,!linux,!netbsd,!solaris

 // This is the fallback implementation of directory watching.
--- a/accounts/manager.go
+++ b/accounts/manager.go
@@ -25,6 +25,10 @@ import (
 	"github.com/ethereum/go-ethereum/event"
 )

+// managerSubBufferSize determines how many incoming wallet events
+// the manager will buffer in its channel.
+const managerSubBufferSize = 50
+
 // Config contains the settings of the global account manager.
 //
 // TODO(rjl493456442, karalabe, holiman): Get rid of this when account management
@@ -33,18 +37,27 @@ type Config struct {
 	InsecureUnlockAllowed bool // Whether account unlocking in insecure environment is allowed
 }

+// newBackendEvent lets the manager know it should
+// track the given backend for wallet updates.
+type newBackendEvent struct {
+	backend   Backend
+	processed chan struct{} // Informs event emitter that backend has been integrated
+}
+
 // Manager is an overarching account manager that can communicate with various
 // backends for signing transactions.
 type Manager struct {
-	config   *Config                    // Global account manager configurations
-	backends map[reflect.Type][]Backend // Index of backends currently registered
-	updaters []event.Subscription       // Wallet update subscriptions for all backends
-	updates  chan WalletEvent           // Subscription sink for backend wallet changes
-	wallets  []Wallet                   // Cache of all wallets from all registered backends
+	config      *Config                    // Global account manager configurations
+	backends    map[reflect.Type][]Backend // Index of backends currently registered
+	updaters    []event.Subscription       // Wallet update subscriptions for all backends
+	updates     chan WalletEvent           // Subscription sink for backend wallet changes
+	newBackends chan newBackendEvent       // Incoming backends to be tracked by the manager
+	wallets     []Wallet                   // Cache of all wallets from all registered backends

 	feed event.Feed // Wallet feed notifying of arrivals/departures

 	quit chan chan error
+	term chan struct{} // Channel is closed upon termination of the update loop
 	lock sync.RWMutex
 }

@@ -57,7 +70,7 @@ func NewManager(config *Config, backends ...Backend) *Manager {
 		wallets = merge(wallets, backend.Wallets()...)
 	}
 	// Subscribe to wallet notifications from all backends
-	updates := make(chan WalletEvent, 4*len(backends))
+	updates := make(chan WalletEvent, managerSubBufferSize)

 	subs := make([]event.Subscription, len(backends))
 	for i, backend := range backends {
@@ -65,12 +78,14 @@ func NewManager(config *Config, backends ...Backend) *Manager {
 	}
 	// Assemble the account manager and return
 	am := &Manager{
-		config:   config,
-		backends: make(map[reflect.Type][]Backend),
-		updaters: subs,
-		updates:  updates,
-		wallets:  wallets,
-		quit:     make(chan chan error),
+		config:      config,
+		backends:    make(map[reflect.Type][]Backend),
+		updaters:    subs,
+		updates:     updates,
+		newBackends: make(chan newBackendEvent),
+		wallets:     wallets,
+		quit:        make(chan chan error),
+		term:        make(chan struct{}),
 	}
 	for _, backend := range backends {
 		kind := reflect.TypeOf(backend)
@@ -93,6 +108,14 @@ func (am *Manager) Config() *Config {
 	return am.config
 }

+// AddBackend starts the tracking of an additional backend for wallet updates.
+// cmd/geth assumes once this func returns the backends have been already integrated.
+func (am *Manager) AddBackend(backend Backend) {
+	done := make(chan struct{})
+	am.newBackends <- newBackendEvent{backend, done}
+	<-done
+}
+
 // update is the wallet event loop listening for notifications from the backends
 // and updating the cache of wallets.
 func (am *Manager) update() {
@@ -122,10 +145,22 @@ func (am *Manager) update() {

 			// Notify any listeners of the event
 			am.feed.Send(event)
-
+		case event := <-am.newBackends:
+			am.lock.Lock()
+			// Update caches
+			backend := event.backend
+			am.wallets = merge(am.wallets, backend.Wallets()...)
+			am.updaters = append(am.updaters, backend.Subscribe(am.updates))
+			kind := reflect.TypeOf(backend)
+			am.backends[kind] = append(am.backends[kind], backend)
+			am.lock.Unlock()
+			close(event.processed)
 		case errc := <-am.quit:
 			// Manager terminating, return
 			errc <- nil
+			// Signals event emitters the loop is not receiving values
+			// to prevent them from getting stuck.
+			close(am.term)
 			return
 		}
 	}
@@ -133,6 +168,9 @@ func (am *Manager) update() {

 // Backends retrieves the backend(s) with the given type from the account manager.
 func (am *Manager) Backends(kind reflect.Type) []Backend {
+	am.lock.RLock()
+	defer am.lock.RUnlock()
+
 	return am.backends[kind]
 }

--- a/accounts/scwallet/hub.go
+++ b/accounts/scwallet/hub.go
@@ -34,7 +34,7 @@ package scwallet

 import (
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"os"
 	"path/filepath"
 	"sort"
@@ -96,7 +96,7 @@ func (hub *Hub) readPairings() error {
 		return err
 	}

-	pairingData, err := ioutil.ReadAll(pairingFile)
+	pairingData, err := io.ReadAll(pairingFile)
 	if err != nil {
 		return err
 	}
--- a/accounts/scwallet/wallet.go
+++ b/accounts/scwallet/wallet.go
@@ -638,7 +638,7 @@ func (w *Wallet) Derive(path accounts.DerivationPath, pin bool) (accounts.Accoun
 // accounts.
 //
 // Note, self derivation will increment the last component of the specified path
-// opposed to decending into a child path to allow discovering accounts starting
+// opposed to descending into a child path to allow discovering accounts starting
 // from non zero components.
 //
 // Some hardware wallets switched derivation paths through their evolution, so
--- a/accounts/usbwallet/wallet.go
+++ b/accounts/usbwallet/wallet.go
@@ -496,7 +496,7 @@ func (w *wallet) Derive(path accounts.DerivationPath, pin bool) (accounts.Accoun
 // accounts.
 //
 // Note, self derivation will increment the last component of the specified path
-// opposed to decending into a child path to allow discovering accounts starting
+// opposed to descending into a child path to allow discovering accounts starting
 // from non zero components.
 //
 // Some hardware wallets switched derivation paths through their evolution, so
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,29 +1,57 @@
-os: Visual Studio 2019
 clone_depth: 5
 version: "{branch}.{build}"
+
+image:
+  - Ubuntu
+  - Visual Studio 2019
+
 environment:
  matrix:
-    # We use gcc from MSYS2 because it is the most recent compiler version available on
-    # AppVeyor. Note: gcc.exe only works properly if the corresponding bin/ directory is
-    # contained in PATH.
    - GETH_ARCH: amd64
-      GETH_CC: C:\msys64\mingw64\bin\gcc.exe
-      PATH: C:\msys64\mingw64\bin;C:\Program Files (x86)\NSIS\;%PATH%
+      GETH_MINGW: 'C:\msys64\mingw64'
    - GETH_ARCH: 386
-      GETH_CC: C:\msys64\mingw32\bin\gcc.exe
-      PATH: C:\msys64\mingw32\bin;C:\Program Files (x86)\NSIS\;%PATH%
+      GETH_MINGW: 'C:\msys64\mingw32'

 install:
-  - git submodule update --init --depth 1
+  - git submodule update --init --depth 1 --recursive
  - go version
-  - "%GETH_CC% --version"

-build_script:
-  - go run build\ci.go install -dlgo -arch %GETH_ARCH% -cc %GETH_CC%
+for:
+  # Linux has its own script without -arch and -cc.
+  # The linux builder also runs lint.
+  - matrix:
+      only:
+        - image: Ubuntu
+    build_script:
+      - go run build/ci.go lint
+      - go run build/ci.go install -dlgo
+    test_script:
+      - go run build/ci.go test -dlgo -coverage

-after_build:
-  - go run build\ci.go archive -arch %GETH_ARCH% -type zip -signer WINDOWS_SIGNING_KEY -upload gethstore/builds
-  - go run build\ci.go nsis -arch %GETH_ARCH% -signer WINDOWS_SIGNING_KEY -upload gethstore/builds
+  # linux/386 is disabled.
+  - matrix:
+      exclude:
+        - image: Ubuntu
+          GETH_ARCH: 386

-test_script:
-  - go run build\ci.go test -dlgo -arch %GETH_ARCH% -cc %GETH_CC% -coverage
+  # Windows builds for amd64 + 386.
+  - matrix:
+      only:
+        - image: Visual Studio 2019
+    environment:
+      # We use gcc from MSYS2 because it is the most recent compiler version available on
+      # AppVeyor. Note: gcc.exe only works properly if the corresponding bin/ directory is
+      # contained in PATH.
+      GETH_CC: '%GETH_MINGW%\bin\gcc.exe'
+      PATH: '%GETH_MINGW%\bin;C:\Program Files (x86)\NSIS\;%PATH%'
+    build_script:
+      - 'echo %GETH_ARCH%'
+      - 'echo %GETH_CC%'
+      - '%GETH_CC% --version'
+      - go run build/ci.go install -dlgo -arch %GETH_ARCH% -cc %GETH_CC%
+    after_build:
+      # Upload builds. Note that ci.go makes this a no-op PR builds.
+      - go run build/ci.go archive -arch %GETH_ARCH% -type zip -signer WINDOWS_SIGNING_KEY -upload gethstore/builds
+      - go run build/ci.go nsis -arch %GETH_ARCH% -signer WINDOWS_SIGNING_KEY -upload gethstore/builds
+    test_script:
+      - go run build/ci.go test -dlgo -arch %GETH_ARCH% -cc %GETH_CC% -coverage
--- a/build/bot/macos-build.sh
+++ b/build/bot/macos-build.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -e -x
+
+# -- Check XCode version
+xcodebuild -version
+# xcrun simctl list
+
+# -- Build for macOS and upload to Azure
+go run build/ci.go install -dlgo
+go run build/ci.go archive -type tar # -signer OSX_SIGNING_KEY -upload gethstore/builds
+
+# # -- CocoaPods
+# gem uninstall cocoapods -a -x
+# gem install cocoapods
+# mv ~/.cocoapods/repos/master ~/.cocoapods/repos/master.bak
+# sed -i '.bak' 's/repo.join/!repo.join/g' $(dirname `gem which cocoapods`)/cocoapods/sources_manager.rb
+# git clone --depth=1 https://github.com/CocoaPods/Specs.git ~/.cocoapods/repos/master
+# pod setup --verbose
+
+# # -- Build for iOS and upload to Azure
+# go run build/ci.go xcode -signer IOS_SIGNING_KEY -upload gethstore/builds
--- a/build/bot/ppa-build.sh
+++ b/build/bot/ppa-build.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -e -x
+
+# Note: this script is meant to be run in a Debian/Ubuntu docker container,
+# as user 'root'.
+
+# Install the required tools for creating source packages.
+apt-get -yq --no-install-suggests --no-install-recommends install\
+     devscripts debhelper dput fakeroot
+
+# Add the SSH key of ppa.launchpad.net to known_hosts.
+mkdir -p ~/.ssh
+echo '|1|7SiYPr9xl3uctzovOTj4gMwAC1M=|t6ReES75Bo/PxlOPJ6/GsGbTrM0= ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA0aKz5UTUndYgIGG7dQBV+HaeuEZJ2xPHo2DS2iSKvUL4xNMSAY4UguNW+pX56nAQmZKIZZ8MaEvSj6zMEDiq6HFfn5JcTlM80UwlnyKe8B8p7Nk06PPQLrnmQt5fh0HmEcZx+JU9TZsfCHPnX7MNz4ELfZE6cFsclClrKim3BHUIGq//t93DllB+h4O9LHjEUsQ1Sr63irDLSutkLJD6RXchjROXkNirlcNVHH/jwLWR5RcYilNX7S5bIkK8NlWPjsn/8Ua5O7I9/YoE97PpO6i73DTGLh5H9JN/SITwCKBkgSDWUt61uPK3Y11Gty7o2lWsBjhBUm2Y38CBsoGmBw==' >> ~/.ssh/known_hosts
+
+# Build the source package and upload.
+go run build/ci.go debsrc -upload ethereum/ethereum -sftp-user geth-ci -signer "Go Ethereum Linux Builder <geth-ci@ethereum.org>"
--- a/build/checksums.txt
+++ b/build/checksums.txt
@@ -1,33 +1,58 @@
 # This file contains sha256 checksums of optional build dependencies.

-b298d29de9236ca47a023e382313bcc2d2eed31dfa706b60a04103ce83a71a25  go1.16.3.src.tar.gz
-6bb1cf421f8abc2a9a4e39140b7397cdae6aca3e8d36dcff39a1a77f4f1170ac  go1.16.3.darwin-amd64.tar.gz
-f4e96bbcd5d2d1942f5b55d9e4ab19564da4fad192012f6d7b0b9b055ba4208f  go1.16.3.darwin-arm64.tar.gz
-48b2d1481db756c88c18b1f064dbfc3e265ce4a775a23177ca17e25d13a24c5d  go1.16.3.linux-386.tar.gz
-951a3c7c6ce4e56ad883f97d9db74d3d6d80d5fec77455c6ada6c1f7ac4776d2  go1.16.3.linux-amd64.tar.gz
-566b1d6f17d2bc4ad5f81486f0df44f3088c3ed47a3bec4099d8ed9939e90d5d  go1.16.3.linux-arm64.tar.gz
-0dae30385e3564a557dac7f12a63eedc73543e6da0f6017990e214ce8cc8797c  go1.16.3.linux-armv6l.tar.gz
-a3c16e1531bf9726f47911c4a9ed7cb665a6207a51c44f10ebad4db63b4bcc5a  go1.16.3.windows-386.zip
-a4400345135b36cb7942e52bbaf978b66814738b855eeff8de879a09fd99de7f  go1.16.3.windows-amd64.zip
-31ecd11d497684fa8b0f01ba784590c4c760943665fdc4fe0adaa1405c71736c  go1.16.3.freebsd-386.tar.gz
-ffbd920b309e62e807457b11d80e8c17fefe3ef6de423aaba4b1e270b2ca4c3d  go1.16.3.freebsd-amd64.tar.gz
-5eb046bbbbc7fe2591846a4303884cb5a01abb903e3e61e33459affe7874e811  go1.16.3.linux-ppc64le.tar.gz
-3e8bd7bde533a73fd6fa75b5288678ef397e76c198cfb26b8ae086035383b1cf  go1.16.3.linux-s390x.tar.gz
+efd43e0f1402e083b73a03d444b7b6576bb4c539ac46208b63a916b69aca4088  go1.18.1.src.tar.gz
+3703e9a0db1000f18c0c7b524f3d378aac71219b4715a6a4c5683eb639f41a4d  go1.18.1.darwin-amd64.tar.gz
+6d5641a06edba8cd6d425fb0adad06bad80e2afe0fa91b4aa0e5aed1bc78f58e  go1.18.1.darwin-arm64.tar.gz
+b9a9063d4265d8ccc046c9b314194d6eadc47e56d0d637db81e98e68aad45035  go1.18.1.freebsd-386.tar.gz
+2bc1c138d645e37dbbc63517dd1cf1bf33fc4cb95f442a6384df0418b5134e9f  go1.18.1.freebsd-amd64.tar.gz
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+b3b815f47ababac13810fc6021eb73d65478e0b2db4b09d348eefad9581a2334  go1.18.1.linux-amd64.tar.gz
+56a91851c97fb4697077abbca38860f735c32b38993ff79b088dac46e4735633  go1.18.1.linux-arm64.tar.gz
+9edc01c8e7db64e9ceeffc8258359e027812886ceca3444e83c4eb96ddb068ee  go1.18.1.linux-armv6l.tar.gz
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+49ae65551acbfaa57b52fbefa0350b2072512ae3103b8cf1a919a02626dbc743  go1.18.1.windows-386.zip
+c30bc3f1f7314a953fe208bd9cd5e24bd9403392a6c556ced3677f9f70f71fe1  go1.18.1.windows-amd64.zip
+2c4a8265030eac37f906634f5c13c22c3d0ea725f2488e1bca005c6b981653d7  go1.18.1.windows-arm64.zip

-7e9a47ab540aa3e8472fbf8120d28bed3b9d9cf625b955818e8bc69628d7187c  golangci-lint-1.39.0-darwin-amd64.tar.gz
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+ef7002a2229f5ff5ba201a715fcf877664ea88decbe58e69d163293913024955  golangci-lint-1.45.2-linux-s390x.tar.gz
+f13ecbd09228632e6bbe91a8324bd675c406eed22eb6d2c1e8192eed9ec4f914  golangci-lint-1.45.2-linux-386.tar.gz
+f4cd9cfb09252f51699407277512263cae8409b665dd764f55a34738d0e89edc  golangci-lint-1.45.2-linux-riscv64.rpm
+fb1945dc59d37c9d14bf0a4aea11ea8651fa0e1d582ea80c4c44d0a536c08893  golangci-lint-1.45.2-linux-mips64.tar.gz
+fe542c22738010f453c735a3c410decfd3784d1bd394b395c298ee298fc4c606  golangci-lint-1.45.2-linux-mips64le.rpm
--- a/build/ci.go
+++ b/build/ci.go
@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

+//go:build none
 // +build none

 /*
@@ -32,7 +33,6 @@ Available commands are:
   nsis                                                                                        -- creates a Windows NSIS installer
   aar        [ -local ] [ -sign key-id ] [-deploy repo] [ -upload dest ]                      -- creates an Android archive
   xcode      [ -local ] [ -sign key-id ] [-deploy repo] [ -upload dest ]                      -- creates an iOS XCode framework
-   xgo        [ -alltools ] [ options ]                                                        -- cross builds according to options
   purge      [ -store blobstore ] [ -days threshold ]                                         -- purges old archives from the blobstore

 For all commands, -n prevents execution of external programs (dry run mode).
@@ -46,7 +46,6 @@ import (
 	"encoding/base64"
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -54,10 +53,12 @@ import (
 	"path/filepath"
 	"regexp"
 	"runtime"
+	"strconv"
 	"strings"
 	"time"

 	"github.com/cespare/cp"
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto/signify"
 	"github.com/ethereum/go-ethereum/internal/build"
 	"github.com/ethereum/go-ethereum/params"
@@ -128,20 +129,16 @@ var (

 	// Distros for which packages are created.
 	// Note: vivid is unsupported because there is no golang-1.6 package for it.
-	// Note: wily is unsupported because it was officially deprecated on Launchpad.
-	// Note: yakkety is unsupported because it was officially deprecated on Launchpad.
-	// Note: zesty is unsupported because it was officially deprecated on Launchpad.
-	// Note: artful is unsupported because it was officially deprecated on Launchpad.
-	// Note: cosmic is unsupported because it was officially deprecated on Launchpad.
-	// Note: disco is unsupported because it was officially deprecated on Launchpad.
-	// Note: eoan is unsupported because it was officially deprecated on Launchpad.
+	// Note: the following Ubuntu releases have been officially deprecated on Launchpad:
+	//   wily, yakkety, zesty, artful, cosmic, disco, eoan, groovy, hirsuite
 	debDistroGoBoots = map[string]string{
-		"trusty":  "golang-1.11",
-		"xenial":  "golang-go",
-		"bionic":  "golang-go",
-		"focal":   "golang-go",
-		"groovy":  "golang-go",
-		"hirsute": "golang-go",
+		"trusty": "golang-1.11", // EOL: 04/2024
+		"xenial": "golang-go",   // EOL: 04/2026
+		"bionic": "golang-go",   // EOL: 04/2028
+		"focal":  "golang-go",   // EOL: 04/2030
+		"impish": "golang-go",   // EOL: 07/2022
+		"jammy":  "golang-go",   // EOL: 04/2032
+		//"kinetic": "golang-go",   //  EOL: 07/2023
 	}

 	debGoBootPaths = map[string]string{
@@ -152,7 +149,7 @@ var (
 	// This is the version of go that will be downloaded by
 	//
 	//     go run ci.go install -dlgo
-	dlgoVersion = "1.16.3"
+	dlgoVersion = "1.18.1"
 )

 var GOBIN, _ = filepath.Abs(filepath.Join("build", "bin"))
@@ -167,7 +164,7 @@ func executablePath(name string) string {
 func main() {
 	log.SetFlags(log.Lshortfile)

-	if _, err := os.Stat(filepath.Join("build", "ci.go")); os.IsNotExist(err) {
+	if !common.FileExist(filepath.Join("build", "ci.go")) {
 		log.Fatal("this script must be run from the root of the repository")
 	}
 	if len(os.Args) < 2 {
@@ -182,6 +179,8 @@ func main() {
 		doLint(os.Args[2:])
 	case "archive":
 		doArchive(os.Args[2:])
+	case "docker":
+		doDocker(os.Args[2:])
 	case "debsrc":
 		doDebianSource(os.Args[2:])
 	case "nsis":
@@ -190,8 +189,6 @@ func main() {
 		doAndroidArchive(os.Args[2:])
 	case "xcode":
 		doXCodeFramework(os.Args[2:])
-	case "xgo":
-		doXgo(os.Args[2:])
 	case "purge":
 		doPurge(os.Args[2:])
 	default:
@@ -262,6 +259,11 @@ func buildFlags(env build.Environment) (flags []string) {
 	if runtime.GOOS == "darwin" {
 		ld = append(ld, "-s")
 	}
+	// Enforce the stacksize to 8M, which is the case on most platforms apart from
+	// alpine Linux.
+	if runtime.GOOS == "linux" {
+		ld = append(ld, "-extldflags", "-Wl,-z,stack-size=0x800000")
+	}
 	if len(ld) > 0 {
 		flags = append(flags, "-ldflags", strings.Join(ld, " "))
 	}
@@ -279,6 +281,7 @@ func doTest(cmdline []string) {
 		cc       = flag.String("cc", "", "Sets C compiler binary")
 		coverage = flag.Bool("coverage", false, "Whether to record code coverage")
 		verbose  = flag.Bool("v", false, "Whether to log verbosely")
+		race     = flag.Bool("race", false, "Execute the race detector")
 	)
 	flag.CommandLine.Parse(cmdline)

@@ -299,6 +302,9 @@ func doTest(cmdline []string) {
 	if *verbose {
 		gotest.Args = append(gotest.Args, "-v")
 	}
+	if *race {
+		gotest.Args = append(gotest.Args, "-race")
+	}

 	packages := []string{"./..."}
 	if len(flag.CommandLine.Args()) > 0 {
@@ -327,12 +333,21 @@ func doLint(cmdline []string) {

 // downloadLinter downloads and unpacks golangci-lint.
 func downloadLinter(cachedir string) string {
-	const version = "1.39.0"
+	const version = "1.45.2"

 	csdb := build.MustLoadChecksums("build/checksums.txt")
-	base := fmt.Sprintf("golangci-lint-%s-%s-%s", version, runtime.GOOS, runtime.GOARCH)
-	url := fmt.Sprintf("https://github.com/golangci/golangci-lint/releases/download/v%s/%s.tar.gz", version, base)
-	archivePath := filepath.Join(cachedir, base+".tar.gz")
+	arch := runtime.GOARCH
+	ext := ".tar.gz"
+
+	if runtime.GOOS == "windows" {
+		ext = ".zip"
+	}
+	if arch == "arm" {
+		arch += "v" + os.Getenv("GOARM")
+	}
+	base := fmt.Sprintf("golangci-lint-%s-%s-%s", version, runtime.GOOS, arch)
+	url := fmt.Sprintf("https://github.com/golangci/golangci-lint/releases/download/v%s/%s%s", version, base, ext)
+	archivePath := filepath.Join(cachedir, base+ext)
 	if err := csdb.DownloadFile(url, archivePath); err != nil {
 		log.Fatal(err)
 	}
@@ -446,12 +461,178 @@ func maybeSkipArchive(env build.Environment) {
 		log.Printf("skipping archive creation because this is a cron job")
 		os.Exit(0)
 	}
-	if env.Branch != "master" && !strings.HasPrefix(env.Tag, "v1.") {
-		log.Printf("skipping archive creation because branch %q, tag %q is not on the whitelist", env.Branch, env.Tag)
+	if env.Branch != "master" && env.Branch != "buildbot-testing" && !strings.HasPrefix(env.Tag, "v1.") {
+		log.Printf("skipping archive creation because branch %q, tag %q is not on the inclusion list", env.Branch, env.Tag)
 		os.Exit(0)
 	}
 }

+// Builds the docker images and optionally uploads them to Docker Hub.
+func doDocker(cmdline []string) {
+	var (
+		image    = flag.Bool("image", false, `Whether to build and push an arch specific docker image`)
+		manifest = flag.String("manifest", "", `Push a multi-arch docker image for the specified architectures (usually "amd64,arm64")`)
+		upload   = flag.String("upload", "", `Where to upload the docker image (usually "ethereum/client-go")`)
+	)
+	flag.CommandLine.Parse(cmdline)
+
+	// Skip building and pushing docker images for PR builds
+	env := build.Env()
+	maybeSkipArchive(env)
+
+	// Retrieve the upload credentials and authenticate
+	user := getenvBase64("DOCKER_HUB_USERNAME")
+	pass := getenvBase64("DOCKER_HUB_PASSWORD")
+
+	if len(user) > 0 && len(pass) > 0 {
+		auther := exec.Command("docker", "login", "-u", string(user), "--password-stdin")
+		auther.Stdin = bytes.NewReader(pass)
+		build.MustRun(auther)
+	}
+	// Retrieve the version infos to build and push to the following paths:
+	//  - ethereum/client-go:latest                            - Pushes to the master branch, Geth only
+	//  - ethereum/client-go:stable                            - Version tag publish on GitHub, Geth only
+	//  - ethereum/client-go:alltools-latest                   - Pushes to the master branch, Geth & tools
+	//  - ethereum/client-go:alltools-stable                   - Version tag publish on GitHub, Geth & tools
+	//  - ethereum/client-go:release-<major>.<minor>           - Version tag publish on GitHub, Geth only
+	//  - ethereum/client-go:alltools-release-<major>.<minor>  - Version tag publish on GitHub, Geth & tools
+	//  - ethereum/client-go:v<major>.<minor>.<patch>          - Version tag publish on GitHub, Geth only
+	//  - ethereum/client-go:alltools-v<major>.<minor>.<patch> - Version tag publish on GitHub, Geth & tools
+	var tags []string
+
+	switch {
+	case env.Branch == "master":
+		tags = []string{"latest"}
+	case strings.HasPrefix(env.Tag, "v1."):
+		tags = []string{"stable", fmt.Sprintf("release-1.%d", params.VersionMinor), "v" + params.Version}
+	}
+	// If architecture specific image builds are requested, build and push them
+	if *image {
+		build.MustRunCommand("docker", "build", "--build-arg", "COMMIT="+env.Commit, "--build-arg", "VERSION="+params.VersionWithMeta, "--build-arg", "BUILDNUM="+env.Buildnum, "--tag", fmt.Sprintf("%s:TAG", *upload), ".")
+		build.MustRunCommand("docker", "build", "--build-arg", "COMMIT="+env.Commit, "--build-arg", "VERSION="+params.VersionWithMeta, "--build-arg", "BUILDNUM="+env.Buildnum, "--tag", fmt.Sprintf("%s:alltools-TAG", *upload), "-f", "Dockerfile.alltools", ".")
+
+		// Tag and upload the images to Docker Hub
+		for _, tag := range tags {
+			gethImage := fmt.Sprintf("%s:%s-%s", *upload, tag, runtime.GOARCH)
+			toolImage := fmt.Sprintf("%s:alltools-%s-%s", *upload, tag, runtime.GOARCH)
+
+			// If the image already exists (non version tag), check the build
+			// number to prevent overwriting a newer commit if concurrent builds
+			// are running. This is still a tiny bit racey if two published are
+			// done at the same time, but that's extremely unlikely even on the
+			// master branch.
+			for _, img := range []string{gethImage, toolImage} {
+				if exec.Command("docker", "pull", img).Run() != nil {
+					continue // Generally the only failure is a missing image, which is good
+				}
+				buildnum, err := exec.Command("docker", "inspect", "--format", "{{index .Config.Labels \"buildnum\"}}", img).CombinedOutput()
+				if err != nil {
+					log.Fatalf("Failed to inspect container: %v\nOutput: %s", err, string(buildnum))
+				}
+				buildnum = bytes.TrimSpace(buildnum)
+
+				if len(buildnum) > 0 && len(env.Buildnum) > 0 {
+					oldnum, err := strconv.Atoi(string(buildnum))
+					if err != nil {
+						log.Fatalf("Failed to parse old image build number: %v", err)
+					}
+					newnum, err := strconv.Atoi(env.Buildnum)
+					if err != nil {
+						log.Fatalf("Failed to parse current build number: %v", err)
+					}
+					if oldnum > newnum {
+						log.Fatalf("Current build number %d not newer than existing %d", newnum, oldnum)
+					} else {
+						log.Printf("Updating %s from build %d to %d", img, oldnum, newnum)
+					}
+				}
+			}
+			build.MustRunCommand("docker", "image", "tag", fmt.Sprintf("%s:TAG", *upload), gethImage)
+			build.MustRunCommand("docker", "image", "tag", fmt.Sprintf("%s:alltools-TAG", *upload), toolImage)
+			build.MustRunCommand("docker", "push", gethImage)
+			build.MustRunCommand("docker", "push", toolImage)
+		}
+	}
+	// If multi-arch image manifest push is requested, assemble it
+	if len(*manifest) != 0 {
+		// Since different architectures are pushed by different builders, wait
+		// until all required images are updated.
+		var mismatch bool
+		for i := 0; i < 2; i++ { // 2 attempts, second is race check
+			mismatch = false // hope there's no mismatch now
+
+			for _, tag := range tags {
+				for _, arch := range strings.Split(*manifest, ",") {
+					gethImage := fmt.Sprintf("%s:%s-%s", *upload, tag, arch)
+					toolImage := fmt.Sprintf("%s:alltools-%s-%s", *upload, tag, arch)
+
+					for _, img := range []string{gethImage, toolImage} {
+						if out, err := exec.Command("docker", "pull", img).CombinedOutput(); err != nil {
+							log.Printf("Required image %s unavailable: %v\nOutput: %s", img, err, out)
+							mismatch = true
+							break
+						}
+						buildnum, err := exec.Command("docker", "inspect", "--format", "{{index .Config.Labels \"buildnum\"}}", img).CombinedOutput()
+						if err != nil {
+							log.Fatalf("Failed to inspect container: %v\nOutput: %s", err, string(buildnum))
+						}
+						buildnum = bytes.TrimSpace(buildnum)
+
+						if string(buildnum) != env.Buildnum {
+							log.Printf("Build number mismatch on %s: want %s, have %s", img, env.Buildnum, buildnum)
+							mismatch = true
+							break
+						}
+					}
+					if mismatch {
+						break
+					}
+				}
+				if mismatch {
+					break
+				}
+			}
+			if mismatch {
+				// Build numbers mismatching, retry in a short time to
+				// avoid concurrent failes in both publisher images. If
+				// however the retry failed too, it means the concurrent
+				// builder is still crunching, let that do the publish.
+				if i == 0 {
+					time.Sleep(30 * time.Second)
+				}
+				continue
+			}
+			break
+		}
+		if mismatch {
+			log.Println("Relinquishing publish to other builder")
+			return
+		}
+		// Assemble and push the Geth manifest image
+		for _, tag := range tags {
+			gethImage := fmt.Sprintf("%s:%s", *upload, tag)
+
+			var gethSubImages []string
+			for _, arch := range strings.Split(*manifest, ",") {
+				gethSubImages = append(gethSubImages, gethImage+"-"+arch)
+			}
+			build.MustRunCommand("docker", append([]string{"manifest", "create", gethImage}, gethSubImages...)...)
+			build.MustRunCommand("docker", "manifest", "push", gethImage)
+		}
+		// Assemble and push the alltools manifest image
+		for _, tag := range tags {
+			toolImage := fmt.Sprintf("%s:alltools-%s", *upload, tag)
+
+			var toolSubImages []string
+			for _, arch := range strings.Split(*manifest, ",") {
+				toolSubImages = append(toolSubImages, toolImage+"-"+arch)
+			}
+			build.MustRunCommand("docker", append([]string{"manifest", "create", toolImage}, toolSubImages...)...)
+			build.MustRunCommand("docker", "manifest", "push", toolImage)
+		}
+	}
+}
+
 // Debian Packaging
 func doDebianSource(cmdline []string) {
 	var (
@@ -553,8 +734,8 @@ func ppaUpload(workdir, ppa, sshUser string, files []string) {
 	var idfile string
 	if sshkey := getenvBase64("PPA_SSH_KEY"); len(sshkey) > 0 {
 		idfile = filepath.Join(workdir, "sshkey")
-		if _, err := os.Stat(idfile); os.IsNotExist(err) {
-			ioutil.WriteFile(idfile, sshkey, 0600)
+		if !common.FileExist(idfile) {
+			os.WriteFile(idfile, sshkey, 0600)
 		}
 	}
 	// Upload
@@ -577,7 +758,7 @@ func makeWorkdir(wdflag string) string {
 	if wdflag != "" {
 		err = os.MkdirAll(wdflag, 0744)
 	} else {
-		wdflag, err = ioutil.TempDir("", "geth-build-")
+		wdflag, err = os.MkdirTemp("", "geth-build-")
 	}
 	if err != nil {
 		log.Fatal(err)
@@ -775,10 +956,10 @@ func doWindowsInstaller(cmdline []string) {
 	build.Render("build/nsis.pathupdate.nsh", filepath.Join(*workdir, "PathUpdate.nsh"), 0644, nil)
 	build.Render("build/nsis.envvarupdate.nsh", filepath.Join(*workdir, "EnvVarUpdate.nsh"), 0644, nil)
 	if err := cp.CopyFile(filepath.Join(*workdir, "SimpleFC.dll"), "build/nsis.simplefc.dll"); err != nil {
-		log.Fatal("Failed to copy SimpleFC.dll: %v", err)
+		log.Fatalf("Failed to copy SimpleFC.dll: %v", err)
 	}
 	if err := cp.CopyFile(filepath.Join(*workdir, "COPYING"), "COPYING"); err != nil {
-		log.Fatal("Failed to copy copyright note: %v", err)
+		log.Fatalf("Failed to copy copyright note: %v", err)
 	}
 	// Build the installer. This assumes that all the needed files have been previously
 	// built (don't mix building and packaging to keep cross compilation complexity to a
@@ -953,11 +1134,7 @@ func doXCodeFramework(cmdline []string) {
 	tc := new(build.GoToolchain)

 	// Build gomobile.
-	build.MustRun(tc.Install(GOBIN, "golang.org/x/mobile/cmd/gomobile@latest", "golang.org/x/mobile/cmd/gobind@latest"))
-
-	// Ensure all dependencies are available. This is required to make
-	// gomobile bind work because it expects go.sum to contain all checksums.
-	build.MustRun(tc.Go("mod", "download"))
+	build.MustRun(tc.Install(GOBIN, "golang.org/x/mobile/cmd/gomobile", "golang.org/x/mobile/cmd/gobind"))

 	// Build the iOS XCode framework
 	bind := gomobileTool("bind", "-ldflags", "-s -w", "--target", "ios", "-v", "github.com/ethereum/go-ethereum/mobile")
@@ -1036,48 +1213,6 @@ func newPodMetadata(env build.Environment, archive string) podMetadata {
 	}
 }

-// Cross compilation
-
-func doXgo(cmdline []string) {
-	var (
-		alltools = flag.Bool("alltools", false, `Flag whether we're building all known tools, or only on in particular`)
-	)
-	flag.CommandLine.Parse(cmdline)
-	env := build.Env()
-	var tc build.GoToolchain
-
-	// Make sure xgo is available for cross compilation
-	build.MustRun(tc.Install(GOBIN, "github.com/karalabe/xgo@latest"))
-
-	// If all tools building is requested, build everything the builder wants
-	args := append(buildFlags(env), flag.Args()...)
-
-	if *alltools {
-		args = append(args, []string{"--dest", GOBIN}...)
-		for _, res := range allToolsArchiveFiles {
-			if strings.HasPrefix(res, GOBIN) {
-				// Binary tool found, cross build it explicitly
-				args = append(args, "./"+filepath.Join("cmd", filepath.Base(res)))
-				build.MustRun(xgoTool(args))
-				args = args[:len(args)-1]
-			}
-		}
-		return
-	}
-
-	// Otherwise execute the explicit cross compilation
-	path := args[len(args)-1]
-	args = append(args[:len(args)-1], []string{"--dest", GOBIN, path}...)
-	build.MustRun(xgoTool(args))
-}
-
-func xgoTool(args []string) *exec.Cmd {
-	cmd := exec.Command(filepath.Join(GOBIN, "xgo"), args...)
-	cmd.Env = os.Environ()
-	cmd.Env = append(cmd.Env, []string{"GOBIN=" + GOBIN}...)
-	return cmd
-}
-
 // Binary distribution cleanups

 func doPurge(cmdline []string) {
@@ -1105,21 +1240,21 @@ func doPurge(cmdline []string) {

 	// Iterate over the blobs, collect and sort all unstable builds
 	for i := 0; i < len(blobs); i++ {
-		if !strings.Contains(blobs[i].Name, "unstable") {
+		if !strings.Contains(*blobs[i].Name, "unstable") {
 			blobs = append(blobs[:i], blobs[i+1:]...)
 			i--
 		}
 	}
 	for i := 0; i < len(blobs); i++ {
 		for j := i + 1; j < len(blobs); j++ {
-			if blobs[i].Properties.LastModified.After(blobs[j].Properties.LastModified) {
+			if blobs[i].Properties.LastModified.After(*blobs[j].Properties.LastModified) {
 				blobs[i], blobs[j] = blobs[j], blobs[i]
 			}
 		}
 	}
 	// Filter out all archives more recent that the given threshold
 	for i, blob := range blobs {
-		if time.Since(blob.Properties.LastModified) < time.Duration(*limit)*24*time.Hour {
+		if time.Since(*blob.Properties.LastModified) < time.Duration(*limit)*24*time.Hour {
 			blobs = blobs[:i]
 			break
 		}
--- a/build/deb/ethereum/deb.control
+++ b/build/deb/ethereum/deb.control
@@ -5,7 +5,7 @@ Maintainer: {{.Author}}
 Build-Depends: debhelper (>= 8.0.0), {{.GoBootPackage}}
 Standards-Version: 3.9.5
 Homepage: https://ethereum.org
-Vcs-Git: git://github.com/ethereum/go-ethereum.git
+Vcs-Git: https://github.com/ethereum/go-ethereum.git
 Vcs-Browser: https://github.com/ethereum/go-ethereum

 Package: {{.Name}}
--- a/build/tools/tools.go
+++ b/build/tools/tools.go
@@ -0,0 +1,31 @@
+// Copyright 2019 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+//go:build tools
+// +build tools
+
+package tools
+
+import (
+	// Tool imports for go:generate.
+	_ "github.com/fjl/gencodec"
+	_ "github.com/golang/protobuf/protoc-gen-go"
+	_ "golang.org/x/tools/cmd/stringer"
+
+	// Tool imports for mobile build.
+	_ "golang.org/x/mobile/cmd/gobind"
+	_ "golang.org/x/mobile/cmd/gomobile"
+)
--- a/build/update-license.go
+++ b/build/update-license.go
@@ -39,7 +39,6 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -241,7 +240,7 @@ func gitAuthors(files []string) []string {
 }

 func readAuthors() []string {
-	content, err := ioutil.ReadFile("AUTHORS")
+	content, err := os.ReadFile("AUTHORS")
 	if err != nil && !os.IsNotExist(err) {
 		log.Fatalln("error reading AUTHORS:", err)
 	}
@@ -305,7 +304,7 @@ func writeAuthors(files []string) {
 		content.WriteString("\n")
 	}
 	fmt.Println("writing AUTHORS")
-	if err := ioutil.WriteFile("AUTHORS", content.Bytes(), 0644); err != nil {
+	if err := os.WriteFile("AUTHORS", content.Bytes(), 0644); err != nil {
 		log.Fatalln(err)
 	}
 }
@@ -381,7 +380,7 @@ func writeLicense(info *info) {
 	if err != nil {
 		log.Fatalf("error stat'ing %s: %v\n", info.file, err)
 	}
-	content, err := ioutil.ReadFile(info.file)
+	content, err := os.ReadFile(info.file)
 	if err != nil {
 		log.Fatalf("error reading %s: %v\n", info.file, err)
 	}
@@ -400,7 +399,7 @@ func writeLicense(info *info) {
 		return
 	}
 	fmt.Println("writing", info.ShortLicense(), info.file)
-	if err := ioutil.WriteFile(info.file, buf.Bytes(), fi.Mode()); err != nil {
+	if err := os.WriteFile(info.file, buf.Bytes(), fi.Mode()); err != nil {
 		log.Fatalf("error writing %s: %v", info.file, err)
 	}
 }
--- a/cmd/abidump/main.go
+++ b/cmd/abidump/main.go
@@ -23,7 +23,7 @@ import (
 	"os"
 	"strings"

-	"github.com/ethereum/go-ethereum/signer/core"
+	"github.com/ethereum/go-ethereum/signer/core/apitypes"
 	"github.com/ethereum/go-ethereum/signer/fourbyte"
 )

@@ -41,7 +41,7 @@ func parse(data []byte) {
 	if err != nil {
 		die(err)
 	}
-	messages := core.ValidationMessages{}
+	messages := apitypes.ValidationMessages{}
 	db.ValidateCallData(nil, data, &messages)
 	for _, m := range messages.Messages {
 		fmt.Printf("%v: %v\n", m.Typ, m.Message)
--- a/cmd/abigen/main.go
+++ b/cmd/abigen/main.go
@@ -19,7 +19,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -155,9 +155,9 @@ func abigen(c *cli.Context) error {
 		)
 		input := c.GlobalString(abiFlag.Name)
 		if input == "-" {
-			abi, err = ioutil.ReadAll(os.Stdin)
+			abi, err = io.ReadAll(os.Stdin)
 		} else {
-			abi, err = ioutil.ReadFile(input)
+			abi, err = os.ReadFile(input)
 		}
 		if err != nil {
 			utils.Fatalf("Failed to read input ABI: %v", err)
@@ -166,7 +166,7 @@ func abigen(c *cli.Context) error {

 		var bin []byte
 		if binFile := c.GlobalString(binFlag.Name); binFile != "" {
-			if bin, err = ioutil.ReadFile(binFile); err != nil {
+			if bin, err = os.ReadFile(binFile); err != nil {
 				utils.Fatalf("Failed to read input bytecode: %v", err)
 			}
 			if strings.Contains(string(bin), "//") {
@@ -213,7 +213,7 @@ func abigen(c *cli.Context) error {
 			}

 		case c.GlobalIsSet(jsonFlag.Name):
-			jsonOutput, err := ioutil.ReadFile(c.GlobalString(jsonFlag.Name))
+			jsonOutput, err := os.ReadFile(c.GlobalString(jsonFlag.Name))
 			if err != nil {
 				utils.Fatalf("Failed to read combined-json from compiler: %v", err)
 			}
@@ -263,7 +263,7 @@ func abigen(c *cli.Context) error {
 		fmt.Printf("%s\n", code)
 		return nil
 	}
-	if err := ioutil.WriteFile(c.GlobalString(outFlag.Name), []byte(code), 0600); err != nil {
+	if err := os.WriteFile(c.GlobalString(outFlag.Name), []byte(code), 0600); err != nil {
 		utils.Fatalf("Failed to write ABI binding: %v", err)
 	}
 	return nil
--- a/cmd/clef/main.go
+++ b/cmd/clef/main.go
@@ -25,7 +25,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math/big"
 	"os"
 	"os/signal"
@@ -50,10 +49,10 @@ import (
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/ethereum/go-ethereum/signer/core"
+	"github.com/ethereum/go-ethereum/signer/core/apitypes"
 	"github.com/ethereum/go-ethereum/signer/fourbyte"
 	"github.com/ethereum/go-ethereum/signer/rules"
 	"github.com/ethereum/go-ethereum/signer/storage"
-
 	"github.com/mattn/go-colorable"
 	"github.com/mattn/go-isatty"
 	"gopkg.in/urfave/cli.v1"
@@ -374,7 +373,7 @@ func initializeSecrets(c *cli.Context) error {
 		return fmt.Errorf("master key %v already exists, will not overwrite", location)
 	}
 	// Write the file and print the usual warning message
-	if err = ioutil.WriteFile(location, cipherSeed, 0400); err != nil {
+	if err = os.WriteFile(location, cipherSeed, 0400); err != nil {
 		return err
 	}
 	fmt.Printf("A master seed has been generated into %s\n", location)
@@ -593,7 +592,7 @@ func signer(c *cli.Context) error {

 		// Do we have a rule-file?
 		if ruleFile := c.GlobalString(ruleFlag.Name); ruleFile != "" {
-			ruleJS, err := ioutil.ReadFile(ruleFile)
+			ruleJS, err := os.ReadFile(ruleFile)
 			if err != nil {
 				log.Warn("Could not load rules, disabling", "file", ruleFile, "err", err)
 			} else {
@@ -657,11 +656,11 @@ func signer(c *cli.Context) error {
 		cors := utils.SplitAndTrim(c.GlobalString(utils.HTTPCORSDomainFlag.Name))

 		srv := rpc.NewServer()
-		err := node.RegisterApisFromWhitelist(rpcAPI, []string{"account"}, srv, false)
+		err := node.RegisterApis(rpcAPI, []string{"account"}, srv, false)
 		if err != nil {
 			utils.Fatalf("Could not register API: %w", err)
 		}
-		handler := node.NewHTTPHandlerStack(srv, cors, vhosts)
+		handler := node.NewHTTPHandlerStack(srv, cors, vhosts, nil)

 		// set port
 		port := c.Int(rpcPortFlag.Name)
@@ -751,7 +750,7 @@ func readMasterKey(ctx *cli.Context, ui core.UIClientAPI) ([]byte, error) {
 	if err := checkFile(file); err != nil {
 		return nil, err
 	}
-	cipherKey, err := ioutil.ReadFile(file)
+	cipherKey, err := os.ReadFile(file)
 	if err != nil {
 		return nil, err
 	}
@@ -898,7 +897,7 @@ func testExternalUI(api *core.SignerAPI) {
 		addr, _ := common.NewMixedcaseAddressFromString("0x0011223344556677889900112233445566778899")
 		data := `{"types":{"EIP712Domain":[{"name":"name","type":"string"},{"name":"version","type":"string"},{"name":"chainId","type":"uint256"},{"name":"verifyingContract","type":"address"}],"Person":[{"name":"name","type":"string"},{"name":"test","type":"uint8"},{"name":"wallet","type":"address"}],"Mail":[{"name":"from","type":"Person"},{"name":"to","type":"Person"},{"name":"contents","type":"string"}]},"primaryType":"Mail","domain":{"name":"Ether Mail","version":"1","chainId":"1","verifyingContract":"0xCCCcccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"},"message":{"from":{"name":"Cow","test":"3","wallet":"0xcD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826"},"to":{"name":"Bob","wallet":"0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB","test":"2"},"contents":"Hello, Bob!"}}`
 		//_, err := api.SignData(ctx, accounts.MimetypeTypedData, *addr, hexutil.Encode([]byte(data)))
-		var typedData core.TypedData
+		var typedData apitypes.TypedData
 		json.Unmarshal([]byte(data), &typedData)
 		_, err := api.SignTypedData(ctx, *addr, typedData)
 		expectApprove("sign 712 typed data", err)
@@ -923,13 +922,13 @@ func testExternalUI(api *core.SignerAPI) {
 		time.Sleep(delay)
 		data := hexutil.Bytes([]byte{})
 		to := common.NewMixedcaseAddress(a)
-		tx := core.SendTxArgs{
+		tx := apitypes.SendTxArgs{
 			Data:     &data,
 			Nonce:    0x1,
 			Value:    hexutil.Big(*big.NewInt(6)),
 			From:     common.NewMixedcaseAddress(a),
 			To:       &to,
-			GasPrice: hexutil.Big(*big.NewInt(5)),
+			GasPrice: (*hexutil.Big)(big.NewInt(5)),
 			Gas:      1000,
 			Input:    nil,
 		}
@@ -1025,7 +1024,7 @@ func GenDoc(ctx *cli.Context) {
 			"of the work in canonicalizing and making sense of the data, and it's up to the UI to present" +
 			"the user with the contents of the `message`"
 		sighash, msg := accounts.TextAndHash([]byte("hello world"))
-		messages := []*core.NameValueType{{Name: "message", Value: msg, Typ: accounts.MimetypeTextPlain}}
+		messages := []*apitypes.NameValueType{{Name: "message", Value: msg, Typ: accounts.MimetypeTextPlain}}

 		add("SignDataRequest", desc, &core.SignDataRequest{
 			Address:     common.NewMixedcaseAddress(a),
@@ -1055,17 +1054,17 @@ func GenDoc(ctx *cli.Context) {
 		data := hexutil.Bytes([]byte{0x01, 0x02, 0x03, 0x04})
 		add("SignTxRequest", desc, &core.SignTxRequest{
 			Meta: meta,
-			Callinfo: []core.ValidationInfo{
+			Callinfo: []apitypes.ValidationInfo{
 				{Typ: "Warning", Message: "Something looks odd, show this message as a warning"},
 				{Typ: "Info", Message: "User should see this as well"},
 			},
-			Transaction: core.SendTxArgs{
+			Transaction: apitypes.SendTxArgs{
 				Data:     &data,
 				Nonce:    0x1,
 				Value:    hexutil.Big(*big.NewInt(6)),
 				From:     common.NewMixedcaseAddress(a),
 				To:       nil,
-				GasPrice: hexutil.Big(*big.NewInt(5)),
+				GasPrice: (*hexutil.Big)(big.NewInt(5)),
 				Gas:      1000,
 				Input:    nil,
 			}})
@@ -1075,13 +1074,13 @@ func GenDoc(ctx *cli.Context) {
 		add("SignTxResponse - approve", "Response to request to sign a transaction. This response needs to contain the `transaction`"+
 			", because the UI is free to make modifications to the transaction.",
 			&core.SignTxResponse{Approved: true,
-				Transaction: core.SendTxArgs{
+				Transaction: apitypes.SendTxArgs{
 					Data:     &data,
 					Nonce:    0x4,
 					Value:    hexutil.Big(*big.NewInt(6)),
 					From:     common.NewMixedcaseAddress(a),
 					To:       nil,
-					GasPrice: hexutil.Big(*big.NewInt(5)),
+					GasPrice: (*hexutil.Big)(big.NewInt(5)),
 					Gas:      1000,
 					Input:    nil,
 				}})
--- a/cmd/clef/pythonsigner.py
+++ b/cmd/clef/pythonsigner.py
@@ -1,177 +1,315 @@
-import os,sys, subprocess
+import sys
+import subprocess
+
 from tinyrpc.transports import ServerTransport
 from tinyrpc.protocols.jsonrpc import JSONRPCProtocol
-from tinyrpc.dispatch import public,RPCDispatcher
+from tinyrpc.dispatch import public, RPCDispatcher
 from tinyrpc.server import RPCServer

-""" This is a POC example of how to write a custom UI for Clef. The UI starts the
-clef process with the '--stdio-ui' option, and communicates with clef using standard input / output.
+"""
+This is a POC example of how to write a custom UI for Clef.
+The UI starts the clef process with the '--stdio-ui' option
+and communicates with clef using standard input / output.

-The standard input/output is a relatively secure way to communicate, as it does not require opening any ports
-or IPC files. Needless to say, it does not protect against memory inspection mechanisms where an attacker
-can access process memory."""
+The standard input/output is a relatively secure way to communicate,
+as it does not require opening any ports or IPC files. Needless to say,
+it does not protect against memory inspection mechanisms
+where an attacker can access process memory.
+
+To make this work install all the requirements:
+
+  pip install -r requirements.txt
+"""

 try:
    import urllib.parse as urlparse
 except ImportError:
    import urllib as urlparse

+
 class StdIOTransport(ServerTransport):
-    """ Uses std input/output for RPC """
+    """Uses std input/output for RPC"""
+
    def receive_message(self):
        return None, urlparse.unquote(sys.stdin.readline())

    def send_reply(self, context, reply):
        print(reply)

-class PipeTransport(ServerTransport):
-    """ Uses std a pipe for RPC """

-    def __init__(self,input, output):
+class PipeTransport(ServerTransport):
+    """Uses std a pipe for RPC"""
+
+    def __init__(self, input, output):
        self.input = input
        self.output = output

    def receive_message(self):
        data = self.input.readline()
-        print(">> {}".format( data))
+        print(">> {}".format(data))
        return None, urlparse.unquote(data)

    def send_reply(self, context, reply):
-        print("<< {}".format( reply))
-        self.output.write(reply)
-        self.output.write("\n")
+        reply = str(reply, "utf-8")
+        print("<< {}".format(reply))
+        self.output.write("{}\n".format(reply))

-class StdIOHandler():
+
+def sanitize(txt, limit=100):
+    return txt[:limit].encode("unicode_escape").decode("utf-8")
+
+
+def metaString(meta):
+    """
+    "meta":{"remote":"clef binary","local":"main","scheme":"in-proc","User-Agent":"","Origin":""}
+    """  # noqa: E501
+    message = (
+        "\tRequest context:\n"
+        "\t\t{remote} -> {scheme} -> {local}\n"
+        "\tAdditional HTTP header data, provided by the external caller:\n"
+        "\t\tUser-Agent: {user_agent}\n"
+        "\t\tOrigin: {origin}\n"
+    )
+    return message.format(
+        remote=meta.get("remote", "<missing>"),
+        scheme=meta.get("scheme", "<missing>"),
+        local=meta.get("local", "<missing>"),
+        user_agent=sanitize(meta.get("User-Agent"), 200),
+        origin=sanitize(meta.get("Origin"), 100),
+    )
+
+
+class StdIOHandler:
    def __init__(self):
        pass

    @public
-    def ApproveTx(self,req):
+    def approveTx(self, req):
        """
        Example request:
-        {
-            "jsonrpc": "2.0",
-            "method": "ApproveTx",
-            "params": [{
-                "transaction": {
-                    "to": "0xae967917c465db8578ca9024c205720b1a3651A9",
-                    "gas": "0x333",
-                    "gasPrice": "0x123",
-                    "value": "0x10",
-                    "data": "0xd7a5865800000000000000000000000000000000000000000000000000000000000000ff",
-                    "nonce": "0x0"
-                },
-                "from": "0xAe967917c465db8578ca9024c205720b1a3651A9",
-                "call_info": "Warning! Could not validate ABI-data against calldata\nSupplied ABI spec does not contain method signature in data: 0xd7a58658",
-                "meta": {
-                    "remote": "127.0.0.1:34572",
-                    "local": "localhost:8550",
-                    "scheme": "HTTP/1.1"
-                }
-            }],
-            "id": 1
-        }
+
+        {"jsonrpc":"2.0","id":20,"method":"ui_approveTx","params":[{"transaction":{"from":"0xDEADbEeF000000000000000000000000DeaDbeEf","to":"0xDEADbEeF000000000000000000000000DeaDbeEf","gas":"0x3e8","gasPrice":"0x5","maxFeePerGas":null,"maxPriorityFeePerGas":null,"value":"0x6","nonce":"0x1","data":"0x"},"call_info":null,"meta":{"remote":"clef binary","local":"main","scheme":"in-proc","User-Agent":"","Origin":""}}]}

        :param transaction: transaction info
        :param call_info: info abou the call, e.g. if ABI info could not be
        :param meta: metadata about the request, e.g. where the call comes from
        :return:
-        """
-        transaction = req.get('transaction')
-        _from       = req.get('from')
-        call_info   = req.get('call_info')
-        meta        = req.get('meta')
-
+        """  # noqa: E501
+        message = (
+            "Sign transaction request:\n"
+            "\t{meta_string}\n"
+            "\n"
+            "\tFrom: {from_}\n"
+            "\tTo: {to}\n"
+            "\n"
+            "\tAuto-rejecting request"
+        )
+        meta = req.get("meta", {})
+        transaction = req.get("transaction")
+        sys.stdout.write(
+            message.format(
+                meta_string=metaString(meta),
+                from_=transaction.get("from", "<missing>"),
+                to=transaction.get("to", "<missing>"),
+            )
+        )
        return {
-            "approved" : False,
-            #"transaction" : transaction,
-  #          "from" : _from,
-#            "password" : None,
+            "approved": False,
        }

    @public
-    def ApproveSignData(self, req):
-        """ Example request
-
-        """
-        return {"approved": False, "password" : None}
-
-    @public
-    def ApproveExport(self, req):
-        """ Example request
-
-        """
-        return {"approved" : False}
-
-    @public
-    def ApproveImport(self, req):
-        """ Example request
-
-        """
-        return { "approved" : False, "old_password": "", "new_password": ""}
-
-    @public
-    def ApproveListing(self, req):
-        """ Example request
-
-        """
-        return {'accounts': []}
-
-    @public
-    def ApproveNewAccount(self, req):
-        """
-        Example request
-
-        :return:
-        """
-        return {"approved": False,
-                #"password": ""
-                }
-
-    @public
-    def ShowError(self,message = {}):
+    def approveSignData(self, req):
        """
        Example request:

-        {"jsonrpc":"2.0","method":"ShowInfo","params":{"message":"Testing 'ShowError'"},"id":1}
+        {"jsonrpc":"2.0","id":8,"method":"ui_approveSignData","params":[{"content_type":"application/x-clique-header","address":"0x0011223344556677889900112233445566778899","raw_data":"+QIRoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAlAAAAAAAAAAAAAAAAAAAAAAAAAAAoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAuQEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIIFOYIFOYIFOoIFOoIFOppFeHRyYSBkYXRhIEV4dHJhIGRhdGEgRXh0cqAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIgAAAAAAAAAAA==","messages":[{"name":"Clique header","value":"clique header 1337 [0x44381ab449d77774874aca34634cb53bc21bd22aef2d3d4cf40e51176cb585ec]","type":"clique"}],"call_info":null,"hash":"0xa47ab61438a12a06c81420e308c2b7aae44e9cd837a5df70dd021421c0f58643","meta":{"remote":"clef binary","local":"main","scheme":"in-proc","User-Agent":"","Origin":""}}]}
+        """  # noqa: E501
+        message = (
+            "Sign data request:\n"
+            "\t{meta_string}\n"
+            "\n"
+            "\tContent-type: {content_type}\n"
+            "\tAddress: {address}\n"
+            "\tHash: {hash_}\n"
+            "\n"
+            "\tAuto-rejecting request\n"
+        )
+        meta = req.get("meta", {})
+        sys.stdout.write(
+            message.format(
+                meta_string=metaString(meta),
+                content_type=req.get("content_type"),
+                address=req.get("address"),
+                hash_=req.get("hash"),
+            )
+        )

-        :param message: to show
-        :return: nothing
-        """
-        if 'text' in message.keys():
-            sys.stderr.write("Error: {}\n".format( message['text']))
-        return
+        return {
+            "approved": False,
+            "password": None,
+        }

    @public
-    def ShowInfo(self,message = {}):
+    def approveNewAccount(self, req):
        """
-        Example request
-        {"jsonrpc":"2.0","method":"ShowInfo","params":{"message":"Testing 'ShowInfo'"},"id":0}
+        Example request:
+
+        {"jsonrpc":"2.0","id":25,"method":"ui_approveNewAccount","params":[{"meta":{"remote":"clef binary","local":"main","scheme":"in-proc","User-Agent":"","Origin":""}}]}
+        """  # noqa: E501
+        message = (
+            "Create new account request:\n"
+            "\t{meta_string}\n"
+            "\n"
+            "\tAuto-rejecting request\n"
+        )
+        meta = req.get("meta", {})
+        sys.stdout.write(message.format(meta_string=metaString(meta)))
+        return {
+            "approved": False,
+        }
+
+    @public
+    def showError(self, req):
+        """
+        Example request:
+
+        {"jsonrpc":"2.0","method":"ui_showError","params":[{"text":"If you see this message, enter 'yes' to the next question"}]}

        :param message: to display
        :return:nothing
-        """
-
-        if 'text' in message.keys():
-            sys.stdout.write("Error: {}\n".format( message['text']))
+        """  # noqa: E501
+        message = (
+            "## Error\n{text}\n"
+            "Press enter to continue\n"
+        )
+        text = req.get("text")
+        sys.stdout.write(message.format(text=text))
+        input()
        return

+    @public
+    def showInfo(self, req):
+        """
+        Example request:
+
+        {"jsonrpc":"2.0","method":"ui_showInfo","params":[{"text":"If you see this message, enter 'yes' to next question"}]}
+
+        :param message: to display
+        :return:nothing
+        """  # noqa: E501
+        message = (
+            "## Info\n{text}\n"
+            "Press enter to continue\n"
+        )
+        text = req.get("text")
+        sys.stdout.write(message.format(text=text))
+        input()
+        return
+
+    @public
+    def onSignerStartup(self, req):
+        """
+        Example request:
+
+        {"jsonrpc":"2.0", "method":"ui_onSignerStartup", "params":[{"info":{"extapi_http":"n/a","extapi_ipc":"/home/user/.clef/clef.ipc","extapi_version":"6.1.0","intapi_version":"7.0.1"}}]}
+        """  # noqa: E501
+        message = (
+            "\n"
+            "\t\tExt api url: {extapi_http}\n"
+            "\t\tInt api ipc: {extapi_ipc}\n"
+            "\t\tExt api ver: {extapi_version}\n"
+            "\t\tInt api ver: {intapi_version}\n"
+        )
+        info = req.get("info")
+        sys.stdout.write(
+            message.format(
+                extapi_http=info.get("extapi_http"),
+                extapi_ipc=info.get("extapi_ipc"),
+                extapi_version=info.get("extapi_version"),
+                intapi_version=info.get("intapi_version"),
+            )
+        )
+
+    @public
+    def approveListing(self, req):
+        """
+        Example request:
+
+        {"jsonrpc":"2.0","id":23,"method":"ui_approveListing","params":[{"accounts":[{"address":...
+        """  # noqa: E501
+        message = (
+            "\n"
+            "## Account listing request\n"
+            "\t{meta_string}\n"
+            "\tDo you want to allow listing the following accounts?\n"
+            "\t-{addrs}\n"
+            "\n"
+            "->Auto-answering No\n"
+        )
+        meta = req.get("meta", {})
+        accounts = req.get("accounts", [])
+        addrs = [x.get("address") for x in accounts]
+        sys.stdout.write(
+            message.format(
+                addrs="\n\t-".join(addrs),
+                meta_string=metaString(meta)
+            )
+        )
+        return {}
+
+    @public
+    def onInputRequired(self, req):
+        """
+        Example request:
+
+        {"jsonrpc":"2.0","id":1,"method":"ui_onInputRequired","params":[{"title":"Master Password","prompt":"Please enter the password to decrypt the master seed","isPassword":true}]}
+
+        :param message: to display
+        :return:nothing
+        """  # noqa: E501
+        message = (
+            "\n"
+            "## {title}\n"
+            "\t{prompt}\n"
+            "\n"
+            "> "
+        )
+        sys.stdout.write(
+            message.format(
+                title=req.get("title"),
+                prompt=req.get("prompt")
+            )
+        )
+        isPassword = req.get("isPassword")
+        if not isPassword:
+            return {"text": input()}
+
+        return ""
+
+
 def main(args):
    cmd = ["clef", "--stdio-ui"]
    if len(args) > 0 and args[0] == "test":
        cmd.extend(["--stdio-ui-test"])
    print("cmd: {}".format(" ".join(cmd)))
+
    dispatcher = RPCDispatcher()
-    dispatcher.register_instance(StdIOHandler(), '')
+    dispatcher.register_instance(StdIOHandler(), "ui_")
+
    # line buffered
-    p = subprocess.Popen(cmd, bufsize=1, universal_newlines=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+    p = subprocess.Popen(
+        cmd,
+        bufsize=1,
+        universal_newlines=True,
+        stdin=subprocess.PIPE,
+        stdout=subprocess.PIPE,
+    )

    rpc_server = RPCServer(
-        PipeTransport(p.stdout, p.stdin),
-        JSONRPCProtocol(),
-        dispatcher
+        PipeTransport(p.stdout, p.stdin), JSONRPCProtocol(), dispatcher
    )
    rpc_server.serve_forever()

-if __name__ == '__main__':
+
+if __name__ == "__main__":
    main(sys.argv[1:])
--- a/cmd/clef/requirements.txt
+++ b/cmd/clef/requirements.txt
@@ -0,0 +1 @@
+tinyrpc==1.1.4
--- a/cmd/clef/testdata/sign_1559_missing_field_exp_fail.json
+++ b/cmd/clef/testdata/sign_1559_missing_field_exp_fail.json
@@ -0,0 +1,16 @@
+{
+  "jsonrpc": "2.0",
+  "method": "account_signTransaction",
+  "params": [
+    {
+      "from": "0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192",
+      "to": "0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192",
+      "gas": "0x333",
+      "maxFeePerGas": "0x123",
+      "nonce": "0x0",
+      "value": "0x10",
+      "data": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"
+    }
+  ],
+  "id": 67
+}
--- a/cmd/clef/testdata/sign_1559_missing_maxfeepergas_exp_fail.json
+++ b/cmd/clef/testdata/sign_1559_missing_maxfeepergas_exp_fail.json
@@ -0,0 +1,16 @@
+{
+  "jsonrpc": "2.0",
+  "method": "account_signTransaction",
+  "params": [
+    {
+      "from": "0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192",
+      "to": "0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192",
+      "gas": "0x333",
+      "maxPriorityFeePerGas": "0x123",
+      "nonce": "0x0",
+      "value": "0x10",
+      "data": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"
+    }
+  ],
+  "id": 67
+}
--- a/cmd/clef/testdata/sign_1559_tx.json
+++ b/cmd/clef/testdata/sign_1559_tx.json
@@ -0,0 +1,17 @@
+{
+  "jsonrpc": "2.0",
+  "method": "account_signTransaction",
+  "params": [
+    {
+      "from": "0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192",
+      "to": "0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192",
+      "gas": "0x333",
+      "maxPriorityFeePerGas": "0x123",
+      "maxFeePerGas": "0x123",
+      "nonce": "0x0",
+      "value": "0x10",
+      "data": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"
+    }
+  ],
+  "id": 67
+}
--- a/cmd/clef/testdata/sign_bad_checksum_exp_fail.json
+++ b/cmd/clef/testdata/sign_bad_checksum_exp_fail.json
@@ -0,0 +1,17 @@
+{
+  "jsonrpc": "2.0",
+  "method": "account_signTransaction",
+  "params": [
+    {
+	"from":"0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192",
+	"to":"0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192",
+      "gas": "0x333",
+      "gasPrice": "0x123",
+      "nonce": "0x0",
+      "value": "0x10",
+      "data":
+        "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"
+    }
+  ],
+  "id": 67
+}
--- a/cmd/clef/testdata/sign_normal_exp_ok.json
+++ b/cmd/clef/testdata/sign_normal_exp_ok.json
@@ -0,0 +1,17 @@
+{
+  "jsonrpc": "2.0",
+  "method": "account_signTransaction",
+  "params": [
+    {
+	"from":"0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192",
+	"to":"0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192",
+      "gas": "0x333",
+      "gasPrice": "0x123",
+      "nonce": "0x0",
+      "value": "0x10",
+      "data":
+        "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"
+    }
+  ],
+  "id": 67
+}
--- a/cmd/devp2p/dns_cloudflare.go
+++ b/cmd/devp2p/dns_cloudflare.go
@@ -133,7 +133,8 @@ func (c *cloudflareClient) uploadRecords(name string, records map[string]string)
 			log.Info(fmt.Sprintf("Creating %s = %q", path, val))
 			ttl := rootTTL
 			if path != name {
-				ttl = treeNodeTTL // Max TTL permitted by Cloudflare
+				ttl = treeNodeTTLCloudflare // Max TTL permitted by Cloudflare
+
 			}
 			record := cloudflare.DNSRecord{Type: "TXT", Name: path, Content: val, TTL: ttl}
 			_, err = c.CreateDNSRecord(context.Background(), c.zoneID, record)
--- a/cmd/devp2p/dnscmd.go
+++ b/cmd/devp2p/dnscmd.go
@@ -20,7 +20,6 @@ import (
 	"crypto/ecdsa"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"time"
@@ -115,8 +114,9 @@ var (
 )

 const (
-	rootTTL     = 30 * 60              // 30 min
-	treeNodeTTL = 4 * 7 * 24 * 60 * 60 // 4 weeks
+	rootTTL               = 30 * 60              // 30 min
+	treeNodeTTL           = 4 * 7 * 24 * 60 * 60 // 4 weeks
+	treeNodeTTLCloudflare = 24 * 60 * 60         // 1 day
 )

 // dnsSync performs dnsSyncCommand.
@@ -252,7 +252,7 @@ func dnsNukeRoute53(ctx *cli.Context) error {

 // loadSigningKey loads a private key in Ethereum keystore format.
 func loadSigningKey(keyfile string) *ecdsa.PrivateKey {
-	keyjson, err := ioutil.ReadFile(keyfile)
+	keyjson, err := os.ReadFile(keyfile)
 	if err != nil {
 		exit(fmt.Errorf("failed to read the keyfile at '%s': %v", keyfile, err))
 	}
@@ -381,7 +381,7 @@ func writeTreeMetadata(directory string, def *dnsDefinition) {
 		exit(err)
 	}
 	metaFile, _ := treeDefinitionFiles(directory)
-	if err := ioutil.WriteFile(metaFile, metaJSON, 0644); err != nil {
+	if err := os.WriteFile(metaFile, metaJSON, 0644); err != nil {
 		exit(err)
 	}
 }
@@ -410,7 +410,7 @@ func writeTXTJSON(file string, txt map[string]string) {
 		fmt.Println()
 		return
 	}
-	if err := ioutil.WriteFile(file, txtJSON, 0644); err != nil {
+	if err := os.WriteFile(file, txtJSON, 0644); err != nil {
 		exit(err)
 	}
 }
--- a/cmd/devp2p/enrcmd.go
+++ b/cmd/devp2p/enrcmd.go
@@ -22,7 +22,6 @@ import (
 	"encoding/hex"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net"
 	"os"
 	"strconv"
@@ -34,27 +33,29 @@ import (
 	"gopkg.in/urfave/cli.v1"
 )

+var fileFlag = cli.StringFlag{Name: "file"}
+
 var enrdumpCommand = cli.Command{
 	Name:   "enrdump",
 	Usage:  "Pretty-prints node records",
 	Action: enrdump,
 	Flags: []cli.Flag{
-		cli.StringFlag{Name: "file"},
+		fileFlag,
 	},
 }

 func enrdump(ctx *cli.Context) error {
 	var source string
-	if file := ctx.String("file"); file != "" {
+	if file := ctx.String(fileFlag.Name); file != "" {
 		if ctx.NArg() != 0 {
 			return fmt.Errorf("can't dump record from command-line argument in -file mode")
 		}
 		var b []byte
 		var err error
 		if file == "-" {
-			b, err = ioutil.ReadAll(os.Stdin)
+			b, err = io.ReadAll(os.Stdin)
 		} else {
-			b, err = ioutil.ReadFile(file)
+			b, err = os.ReadFile(file)
 		}
 		if err != nil {
 			return err
--- a/cmd/devp2p/internal/ethtest/chain.go
+++ b/cmd/devp2p/internal/ethtest/chain.go
@@ -21,11 +21,11 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math/big"
 	"os"
 	"strings"

+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/forkid"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -39,30 +39,41 @@ type Chain struct {
 	chainConfig *params.ChainConfig
 }

-func (c *Chain) WriteTo(writer io.Writer) error {
-	for _, block := range c.blocks {
-		if err := rlp.Encode(writer, block); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
 // Len returns the length of the chain.
 func (c *Chain) Len() int {
 	return len(c.blocks)
 }

-// TD calculates the total difficulty of the chain.
-func (c *Chain) TD(height int) *big.Int { // TODO later on channge scheme so that the height is included in range
+// TD calculates the total difficulty of the chain at the
+// chain head.
+func (c *Chain) TD() *big.Int {
 	sum := big.NewInt(0)
-	for _, block := range c.blocks[:height] {
+	for _, block := range c.blocks[:c.Len()] {
 		sum.Add(sum, block.Difficulty())
 	}
 	return sum
 }

+// TotalDifficultyAt calculates the total difficulty of the chain
+// at the given block height.
+func (c *Chain) TotalDifficultyAt(height int) *big.Int {
+	sum := big.NewInt(0)
+	if height >= c.Len() {
+		return sum
+	}
+	for _, block := range c.blocks[:height+1] {
+		sum.Add(sum, block.Difficulty())
+	}
+	return sum
+}
+
+func (c *Chain) RootAt(height int) common.Hash {
+	if height < c.Len() {
+		return c.blocks[height].Root()
+	}
+	return common.Hash{}
+}
+
 // ForkID gets the fork id of the chain.
 func (c *Chain) ForkID() forkid.ID {
 	return forkid.NewID(c.chainConfig, c.blocks[0].Hash(), uint64(c.Len()))
@@ -141,7 +152,7 @@ func loadChain(chainfile string, genesis string) (*Chain, error) {
 }

 func loadGenesis(genesisFile string) (core.Genesis, error) {
-	chainConfig, err := ioutil.ReadFile(genesisFile)
+	chainConfig, err := os.ReadFile(genesisFile)
 	if err != nil {
 		return core.Genesis{}, err
 	}
--- a/cmd/devp2p/internal/ethtest/eth66_suite.go
+++ b/cmd/devp2p/internal/ethtest/eth66_suite.go
@@ -1,521 +0,0 @@
-// Copyright 2021 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package ethtest
-
-import (
-	"time"
-
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/ethereum/go-ethereum/eth/protocols/eth"
-	"github.com/ethereum/go-ethereum/internal/utesting"
-	"github.com/ethereum/go-ethereum/p2p"
-)
-
-// Is_66 checks if the node supports the eth66 protocol version,
-// and if not, exists the test suite
-func (s *Suite) Is_66(t *utesting.T) {
-	conn := s.dial66(t)
-	conn.handshake(t)
-	if conn.negotiatedProtoVersion < 66 {
-		t.Fail()
-	}
-}
-
-// TestStatus_66 attempts to connect to the given node and exchange
-// a status message with it on the eth66 protocol, and then check to
-// make sure the chain head is correct.
-func (s *Suite) TestStatus_66(t *utesting.T) {
-	conn := s.dial66(t)
-	defer conn.Close()
-	// get protoHandshake
-	conn.handshake(t)
-	// get status
-	switch msg := conn.statusExchange66(t, s.chain).(type) {
-	case *Status:
-		status := *msg
-		if status.ProtocolVersion != uint32(66) {
-			t.Fatalf("mismatch in version: wanted 66, got %d", status.ProtocolVersion)
-		}
-		t.Logf("got status message: %s", pretty.Sdump(msg))
-	default:
-		t.Fatalf("unexpected: %s", pretty.Sdump(msg))
-	}
-}
-
-// TestGetBlockHeaders_66 tests whether the given node can respond to
-// an eth66 `GetBlockHeaders` request and that the response is accurate.
-func (s *Suite) TestGetBlockHeaders_66(t *utesting.T) {
-	conn := s.setupConnection66(t)
-	defer conn.Close()
-	// get block headers
-	req := &eth.GetBlockHeadersPacket66{
-		RequestId: 3,
-		GetBlockHeadersPacket: &eth.GetBlockHeadersPacket{
-			Origin: eth.HashOrNumber{
-				Hash: s.chain.blocks[1].Hash(),
-			},
-			Amount:  2,
-			Skip:    1,
-			Reverse: false,
-		},
-	}
-	// write message
-	headers, err := s.getBlockHeaders66(conn, req, req.RequestId)
-	if err != nil {
-		t.Fatalf("could not get block headers: %v", err)
-	}
-	// check for correct headers
-	if !headersMatch(t, s.chain, headers) {
-		t.Fatal("received wrong header(s)")
-	}
-}
-
-// TestSimultaneousRequests_66 sends two simultaneous `GetBlockHeader` requests
-// with different request IDs and checks to make sure the node responds with the correct
-// headers per request.
-func (s *Suite) TestSimultaneousRequests_66(t *utesting.T) {
-	// create two connections
-	conn := s.setupConnection66(t)
-	defer conn.Close()
-	// create two requests
-	req1 := &eth.GetBlockHeadersPacket66{
-		RequestId: 111,
-		GetBlockHeadersPacket: &eth.GetBlockHeadersPacket{
-			Origin: eth.HashOrNumber{
-				Hash: s.chain.blocks[1].Hash(),
-			},
-			Amount:  2,
-			Skip:    1,
-			Reverse: false,
-		},
-	}
-	req2 := &eth.GetBlockHeadersPacket66{
-		RequestId: 222,
-		GetBlockHeadersPacket: &eth.GetBlockHeadersPacket{
-			Origin: eth.HashOrNumber{
-				Hash: s.chain.blocks[1].Hash(),
-			},
-			Amount:  4,
-			Skip:    1,
-			Reverse: false,
-		},
-	}
-	// write first request
-	if err := conn.write66(req1, GetBlockHeaders{}.Code()); err != nil {
-		t.Fatalf("failed to write to connection: %v", err)
-	}
-	// write second request
-	if err := conn.write66(req2, GetBlockHeaders{}.Code()); err != nil {
-		t.Fatalf("failed to write to connection: %v", err)
-	}
-	// wait for responses
-	headers1, err := s.waitForBlockHeadersResponse66(conn, req1.RequestId)
-	if err != nil {
-		t.Fatalf("error while waiting for block headers: %v", err)
-	}
-	headers2, err := s.waitForBlockHeadersResponse66(conn, req2.RequestId)
-	if err != nil {
-		t.Fatalf("error while waiting for block headers: %v", err)
-	}
-	// check headers of both responses
-	if !headersMatch(t, s.chain, headers1) {
-		t.Fatalf("wrong header(s) in response to req1: got %v", headers1)
-	}
-	if !headersMatch(t, s.chain, headers2) {
-		t.Fatalf("wrong header(s) in response to req2: got %v", headers2)
-	}
-}
-
-// TestBroadcast_66 tests whether a block announcement is correctly
-// propagated to the given node's peer(s) on the eth66 protocol.
-func (s *Suite) TestBroadcast_66(t *utesting.T) {
-	s.sendNextBlock66(t)
-}
-
-// TestGetBlockBodies_66 tests whether the given node can respond to
-// a `GetBlockBodies` request and that the response is accurate over
-// the eth66 protocol.
-func (s *Suite) TestGetBlockBodies_66(t *utesting.T) {
-	conn := s.setupConnection66(t)
-	defer conn.Close()
-	// create block bodies request
-	id := uint64(55)
-	req := &eth.GetBlockBodiesPacket66{
-		RequestId: id,
-		GetBlockBodiesPacket: eth.GetBlockBodiesPacket{
-			s.chain.blocks[54].Hash(),
-			s.chain.blocks[75].Hash(),
-		},
-	}
-	if err := conn.write66(req, GetBlockBodies{}.Code()); err != nil {
-		t.Fatalf("could not write to connection: %v", err)
-	}
-
-	reqID, msg := conn.readAndServe66(s.chain, timeout)
-	switch msg := msg.(type) {
-	case BlockBodies:
-		if reqID != req.RequestId {
-			t.Fatalf("request ID mismatch: wanted %d, got %d", req.RequestId, reqID)
-		}
-		t.Logf("received %d block bodies", len(msg))
-	default:
-		t.Fatalf("unexpected: %s", pretty.Sdump(msg))
-	}
-}
-
-// TestLargeAnnounce_66 tests the announcement mechanism with a large block.
-func (s *Suite) TestLargeAnnounce_66(t *utesting.T) {
-	nextBlock := len(s.chain.blocks)
-	blocks := []*NewBlock{
-		{
-			Block: largeBlock(),
-			TD:    s.fullChain.TD(nextBlock + 1),
-		},
-		{
-			Block: s.fullChain.blocks[nextBlock],
-			TD:    largeNumber(2),
-		},
-		{
-			Block: largeBlock(),
-			TD:    largeNumber(2),
-		},
-		{
-			Block: s.fullChain.blocks[nextBlock],
-			TD:    s.fullChain.TD(nextBlock + 1),
-		},
-	}
-
-	for i, blockAnnouncement := range blocks[0:3] {
-		t.Logf("Testing malicious announcement: %v\n", i)
-		sendConn := s.setupConnection66(t)
-		if err := sendConn.Write(blockAnnouncement); err != nil {
-			t.Fatalf("could not write to connection: %v", err)
-		}
-		// Invalid announcement, check that peer disconnected
-		switch msg := sendConn.ReadAndServe(s.chain, time.Second*8).(type) {
-		case *Disconnect:
-		case *Error:
-			break
-		default:
-			t.Fatalf("unexpected: %s wanted disconnect", pretty.Sdump(msg))
-		}
-		sendConn.Close()
-	}
-	// Test the last block as a valid block
-	s.sendNextBlock66(t)
-}
-
-func (s *Suite) TestOldAnnounce_66(t *utesting.T) {
-	sendConn, recvConn := s.setupConnection66(t), s.setupConnection66(t)
-	defer sendConn.Close()
-	defer recvConn.Close()
-
-	s.oldAnnounce(t, sendConn, recvConn)
-}
-
-// TestMaliciousHandshake_66 tries to send malicious data during the handshake.
-func (s *Suite) TestMaliciousHandshake_66(t *utesting.T) {
-	conn := s.dial66(t)
-	defer conn.Close()
-	// write hello to client
-	pub0 := crypto.FromECDSAPub(&conn.ourKey.PublicKey)[1:]
-	handshakes := []*Hello{
-		{
-			Version: 5,
-			Caps: []p2p.Cap{
-				{Name: largeString(2), Version: 66},
-			},
-			ID: pub0,
-		},
-		{
-			Version: 5,
-			Caps: []p2p.Cap{
-				{Name: "eth", Version: 64},
-				{Name: "eth", Version: 65},
-				{Name: "eth", Version: 66},
-			},
-			ID: append(pub0, byte(0)),
-		},
-		{
-			Version: 5,
-			Caps: []p2p.Cap{
-				{Name: "eth", Version: 64},
-				{Name: "eth", Version: 65},
-				{Name: "eth", Version: 66},
-			},
-			ID: append(pub0, pub0...),
-		},
-		{
-			Version: 5,
-			Caps: []p2p.Cap{
-				{Name: "eth", Version: 64},
-				{Name: "eth", Version: 65},
-				{Name: "eth", Version: 66},
-			},
-			ID: largeBuffer(2),
-		},
-		{
-			Version: 5,
-			Caps: []p2p.Cap{
-				{Name: largeString(2), Version: 66},
-			},
-			ID: largeBuffer(2),
-		},
-	}
-	for i, handshake := range handshakes {
-		t.Logf("Testing malicious handshake %v\n", i)
-		// Init the handshake
-		if err := conn.Write(handshake); err != nil {
-			t.Fatalf("could not write to connection: %v", err)
-		}
-		// check that the peer disconnected
-		timeout := 20 * time.Second
-		// Discard one hello
-		for i := 0; i < 2; i++ {
-			switch msg := conn.ReadAndServe(s.chain, timeout).(type) {
-			case *Disconnect:
-			case *Error:
-			case *Hello:
-				// Hello's are sent concurrently, so ignore them
-				continue
-			default:
-				t.Fatalf("unexpected: %s", pretty.Sdump(msg))
-			}
-		}
-		// Dial for the next round
-		conn = s.dial66(t)
-	}
-}
-
-// TestMaliciousStatus_66 sends a status package with a large total difficulty.
-func (s *Suite) TestMaliciousStatus_66(t *utesting.T) {
-	conn := s.dial66(t)
-	defer conn.Close()
-	// get protoHandshake
-	conn.handshake(t)
-	status := &Status{
-		ProtocolVersion: uint32(66),
-		NetworkID:       s.chain.chainConfig.ChainID.Uint64(),
-		TD:              largeNumber(2),
-		Head:            s.chain.blocks[s.chain.Len()-1].Hash(),
-		Genesis:         s.chain.blocks[0].Hash(),
-		ForkID:          s.chain.ForkID(),
-	}
-	// get status
-	switch msg := conn.statusExchange(t, s.chain, status).(type) {
-	case *Status:
-		t.Logf("%+v\n", msg)
-	default:
-		t.Fatalf("expected status, got: %#v ", msg)
-	}
-	// wait for disconnect
-	switch msg := conn.ReadAndServe(s.chain, timeout).(type) {
-	case *Disconnect:
-	case *Error:
-		return
-	default:
-		t.Fatalf("expected disconnect, got: %s", pretty.Sdump(msg))
-	}
-}
-
-func (s *Suite) TestTransaction_66(t *utesting.T) {
-	tests := []*types.Transaction{
-		getNextTxFromChain(t, s),
-		unknownTx(t, s),
-	}
-	for i, tx := range tests {
-		t.Logf("Testing tx propagation: %v\n", i)
-		sendSuccessfulTx66(t, s, tx)
-	}
-}
-
-func (s *Suite) TestMaliciousTx_66(t *utesting.T) {
-	badTxs := []*types.Transaction{
-		getOldTxFromChain(t, s),
-		invalidNonceTx(t, s),
-		hugeAmount(t, s),
-		hugeGasPrice(t, s),
-		hugeData(t, s),
-	}
-	sendConn := s.setupConnection66(t)
-	defer sendConn.Close()
-	// set up receiving connection before sending txs to make sure
-	// no announcements are missed
-	recvConn := s.setupConnection66(t)
-	defer recvConn.Close()
-
-	for i, tx := range badTxs {
-		t.Logf("Testing malicious tx propagation: %v\n", i)
-		if err := sendConn.Write(&Transactions{tx}); err != nil {
-			t.Fatalf("could not write to connection: %v", err)
-		}
-
-	}
-	// check to make sure bad txs aren't propagated
-	waitForTxPropagation(t, s, badTxs, recvConn)
-}
-
-// TestZeroRequestID_66 checks that a request ID of zero is still handled
-// by the node.
-func (s *Suite) TestZeroRequestID_66(t *utesting.T) {
-	conn := s.setupConnection66(t)
-	defer conn.Close()
-
-	req := &eth.GetBlockHeadersPacket66{
-		RequestId: 0,
-		GetBlockHeadersPacket: &eth.GetBlockHeadersPacket{
-			Origin: eth.HashOrNumber{
-				Number: 0,
-			},
-			Amount: 2,
-		},
-	}
-	headers, err := s.getBlockHeaders66(conn, req, req.RequestId)
-	if err != nil {
-		t.Fatalf("could not get block headers: %v", err)
-	}
-	if !headersMatch(t, s.chain, headers) {
-		t.Fatal("received wrong header(s)")
-	}
-}
-
-// TestSameRequestID_66 sends two requests with the same request ID
-// concurrently to a single node.
-func (s *Suite) TestSameRequestID_66(t *utesting.T) {
-	conn := s.setupConnection66(t)
-	// create two requests with the same request ID
-	reqID := uint64(1234)
-	request1 := &eth.GetBlockHeadersPacket66{
-		RequestId: reqID,
-		GetBlockHeadersPacket: &eth.GetBlockHeadersPacket{
-			Origin: eth.HashOrNumber{
-				Number: 1,
-			},
-			Amount: 2,
-		},
-	}
-	request2 := &eth.GetBlockHeadersPacket66{
-		RequestId: reqID,
-		GetBlockHeadersPacket: &eth.GetBlockHeadersPacket{
-			Origin: eth.HashOrNumber{
-				Number: 33,
-			},
-			Amount: 2,
-		},
-	}
-	// write the first request
-	err := conn.write66(request1, GetBlockHeaders{}.Code())
-	if err != nil {
-		t.Fatalf("could not write to connection: %v", err)
-	}
-	// perform second request
-	headers2, err := s.getBlockHeaders66(conn, request2, reqID)
-	if err != nil {
-		t.Fatalf("could not get block headers: %v", err)
-		return
-	}
-	// wait for response to first request
-	headers1, err := s.waitForBlockHeadersResponse66(conn, reqID)
-	if err != nil {
-		t.Fatalf("could not get BlockHeaders response: %v", err)
-	}
-	// check if headers match
-	if !headersMatch(t, s.chain, headers1) || !headersMatch(t, s.chain, headers2) {
-		t.Fatal("received wrong header(s)")
-	}
-}
-
-// TestLargeTxRequest_66 tests whether a node can fulfill a large GetPooledTransactions
-// request.
-func (s *Suite) TestLargeTxRequest_66(t *utesting.T) {
-	// send the next block to ensure the node is no longer syncing and is able to accept
-	// txs
-	s.sendNextBlock66(t)
-	// send 2000 transactions to the node
-	hashMap, txs := generateTxs(t, s, 2000)
-	sendConn := s.setupConnection66(t)
-	defer sendConn.Close()
-
-	sendMultipleSuccessfulTxs(t, s, sendConn, txs)
-	// set up connection to receive to ensure node is peered with the receiving connection
-	// before tx request is sent
-	recvConn := s.setupConnection66(t)
-	defer recvConn.Close()
-	// create and send pooled tx request
-	hashes := make([]common.Hash, 0)
-	for _, hash := range hashMap {
-		hashes = append(hashes, hash)
-	}
-	getTxReq := &eth.GetPooledTransactionsPacket66{
-		RequestId:                   1234,
-		GetPooledTransactionsPacket: hashes,
-	}
-	if err := recvConn.write66(getTxReq, GetPooledTransactions{}.Code()); err != nil {
-		t.Fatalf("could not write to conn: %v", err)
-	}
-	// check that all received transactions match those that were sent to node
-	switch msg := recvConn.waitForResponse(s.chain, timeout, getTxReq.RequestId).(type) {
-	case PooledTransactions:
-		for _, gotTx := range msg {
-			if _, exists := hashMap[gotTx.Hash()]; !exists {
-				t.Fatalf("unexpected tx received: %v", gotTx.Hash())
-			}
-		}
-	default:
-		t.Fatalf("unexpected %s", pretty.Sdump(msg))
-	}
-}
-
-// TestNewPooledTxs_66 tests whether a node will do a GetPooledTransactions
-// request upon receiving a NewPooledTransactionHashes announcement.
-func (s *Suite) TestNewPooledTxs_66(t *utesting.T) {
-	// send the next block to ensure the node is no longer syncing and is able to accept
-	// txs
-	s.sendNextBlock66(t)
-	// generate 50 txs
-	hashMap, _ := generateTxs(t, s, 50)
-	// create new pooled tx hashes announcement
-	hashes := make([]common.Hash, 0)
-	for _, hash := range hashMap {
-		hashes = append(hashes, hash)
-	}
-	announce := NewPooledTransactionHashes(hashes)
-	// send announcement
-	conn := s.setupConnection66(t)
-	defer conn.Close()
-	if err := conn.Write(announce); err != nil {
-		t.Fatalf("could not write to connection: %v", err)
-	}
-	// wait for GetPooledTxs request
-	for {
-		_, msg := conn.readAndServe66(s.chain, timeout)
-		switch msg := msg.(type) {
-		case GetPooledTransactions:
-			if len(msg) != len(hashes) {
-				t.Fatalf("unexpected number of txs requested: wanted %d, got %d", len(hashes), len(msg))
-			}
-			return
-		case *NewPooledTransactionHashes, *NewBlock, *NewBlockHashes:
-			// ignore propagated txs and blocks from old tests
-			continue
-		default:
-			t.Fatalf("unexpected %s", pretty.Sdump(msg))
-		}
-	}
-}
--- a/cmd/devp2p/internal/ethtest/eth66_suiteHelpers.go
+++ b/cmd/devp2p/internal/ethtest/eth66_suiteHelpers.go
@@ -1,333 +0,0 @@
-// Copyright 2021 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package ethtest
-
-import (
-	"fmt"
-	"reflect"
-	"time"
-
-	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/eth/protocols/eth"
-	"github.com/ethereum/go-ethereum/internal/utesting"
-	"github.com/ethereum/go-ethereum/p2p"
-	"github.com/ethereum/go-ethereum/rlp"
-	"github.com/stretchr/testify/assert"
-)
-
-func (c *Conn) statusExchange66(t *utesting.T, chain *Chain) Message {
-	status := &Status{
-		ProtocolVersion: uint32(66),
-		NetworkID:       chain.chainConfig.ChainID.Uint64(),
-		TD:              chain.TD(chain.Len()),
-		Head:            chain.blocks[chain.Len()-1].Hash(),
-		Genesis:         chain.blocks[0].Hash(),
-		ForkID:          chain.ForkID(),
-	}
-	return c.statusExchange(t, chain, status)
-}
-
-func (s *Suite) dial66(t *utesting.T) *Conn {
-	conn, err := s.dial()
-	if err != nil {
-		t.Fatalf("could not dial: %v", err)
-	}
-	conn.caps = append(conn.caps, p2p.Cap{Name: "eth", Version: 66})
-	conn.ourHighestProtoVersion = 66
-	return conn
-}
-
-func (c *Conn) write66(req eth.Packet, code int) error {
-	payload, err := rlp.EncodeToBytes(req)
-	if err != nil {
-		return err
-	}
-	_, err = c.Conn.Write(uint64(code), payload)
-	return err
-}
-
-func (c *Conn) read66() (uint64, Message) {
-	code, rawData, _, err := c.Conn.Read()
-	if err != nil {
-		return 0, errorf("could not read from connection: %v", err)
-	}
-
-	var msg Message
-
-	switch int(code) {
-	case (Hello{}).Code():
-		msg = new(Hello)
-
-	case (Ping{}).Code():
-		msg = new(Ping)
-	case (Pong{}).Code():
-		msg = new(Pong)
-	case (Disconnect{}).Code():
-		msg = new(Disconnect)
-	case (Status{}).Code():
-		msg = new(Status)
-	case (GetBlockHeaders{}).Code():
-		ethMsg := new(eth.GetBlockHeadersPacket66)
-		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
-			return 0, errorf("could not rlp decode message: %v", err)
-		}
-		return ethMsg.RequestId, GetBlockHeaders(*ethMsg.GetBlockHeadersPacket)
-	case (BlockHeaders{}).Code():
-		ethMsg := new(eth.BlockHeadersPacket66)
-		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
-			return 0, errorf("could not rlp decode message: %v", err)
-		}
-		return ethMsg.RequestId, BlockHeaders(ethMsg.BlockHeadersPacket)
-	case (GetBlockBodies{}).Code():
-		ethMsg := new(eth.GetBlockBodiesPacket66)
-		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
-			return 0, errorf("could not rlp decode message: %v", err)
-		}
-		return ethMsg.RequestId, GetBlockBodies(ethMsg.GetBlockBodiesPacket)
-	case (BlockBodies{}).Code():
-		ethMsg := new(eth.BlockBodiesPacket66)
-		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
-			return 0, errorf("could not rlp decode message: %v", err)
-		}
-		return ethMsg.RequestId, BlockBodies(ethMsg.BlockBodiesPacket)
-	case (NewBlock{}).Code():
-		msg = new(NewBlock)
-	case (NewBlockHashes{}).Code():
-		msg = new(NewBlockHashes)
-	case (Transactions{}).Code():
-		msg = new(Transactions)
-	case (NewPooledTransactionHashes{}).Code():
-		msg = new(NewPooledTransactionHashes)
-	case (GetPooledTransactions{}.Code()):
-		ethMsg := new(eth.GetPooledTransactionsPacket66)
-		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
-			return 0, errorf("could not rlp decode message: %v", err)
-		}
-		return ethMsg.RequestId, GetPooledTransactions(ethMsg.GetPooledTransactionsPacket)
-	case (PooledTransactions{}.Code()):
-		ethMsg := new(eth.PooledTransactionsPacket66)
-		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
-			return 0, errorf("could not rlp decode message: %v", err)
-		}
-		return ethMsg.RequestId, PooledTransactions(ethMsg.PooledTransactionsPacket)
-	default:
-		msg = errorf("invalid message code: %d", code)
-	}
-
-	if msg != nil {
-		if err := rlp.DecodeBytes(rawData, msg); err != nil {
-			return 0, errorf("could not rlp decode message: %v", err)
-		}
-		return 0, msg
-	}
-	return 0, errorf("invalid message: %s", string(rawData))
-}
-
-func (c *Conn) waitForResponse(chain *Chain, timeout time.Duration, requestID uint64) Message {
-	for {
-		id, msg := c.readAndServe66(chain, timeout)
-		if id == requestID {
-			return msg
-		}
-	}
-}
-
-// ReadAndServe serves GetBlockHeaders requests while waiting
-// on another message from the node.
-func (c *Conn) readAndServe66(chain *Chain, timeout time.Duration) (uint64, Message) {
-	start := time.Now()
-	for time.Since(start) < timeout {
-		c.SetReadDeadline(time.Now().Add(10 * time.Second))
-
-		reqID, msg := c.read66()
-
-		switch msg := msg.(type) {
-		case *Ping:
-			c.Write(&Pong{})
-		case *GetBlockHeaders:
-			headers, err := chain.GetHeaders(*msg)
-			if err != nil {
-				return 0, errorf("could not get headers for inbound header request: %v", err)
-			}
-			resp := &eth.BlockHeadersPacket66{
-				RequestId:          reqID,
-				BlockHeadersPacket: eth.BlockHeadersPacket(headers),
-			}
-			if err := c.write66(resp, BlockHeaders{}.Code()); err != nil {
-				return 0, errorf("could not write to connection: %v", err)
-			}
-		default:
-			return reqID, msg
-		}
-	}
-	return 0, errorf("no message received within %v", timeout)
-}
-
-func (s *Suite) setupConnection66(t *utesting.T) *Conn {
-	// create conn
-	sendConn := s.dial66(t)
-	sendConn.handshake(t)
-	sendConn.statusExchange66(t, s.chain)
-	return sendConn
-}
-
-func (s *Suite) testAnnounce66(t *utesting.T, sendConn, receiveConn *Conn, blockAnnouncement *NewBlock) {
-	// Announce the block.
-	if err := sendConn.Write(blockAnnouncement); err != nil {
-		t.Fatalf("could not write to connection: %v", err)
-	}
-	s.waitAnnounce66(t, receiveConn, blockAnnouncement)
-}
-
-func (s *Suite) waitAnnounce66(t *utesting.T, conn *Conn, blockAnnouncement *NewBlock) {
-	for {
-		_, msg := conn.readAndServe66(s.chain, timeout)
-		switch msg := msg.(type) {
-		case *NewBlock:
-			t.Logf("received NewBlock message: %s", pretty.Sdump(msg.Block))
-			assert.Equal(t,
-				blockAnnouncement.Block.Header(), msg.Block.Header(),
-				"wrong block header in announcement",
-			)
-			assert.Equal(t,
-				blockAnnouncement.TD, msg.TD,
-				"wrong TD in announcement",
-			)
-			return
-		case *NewBlockHashes:
-			blockHashes := *msg
-			t.Logf("received NewBlockHashes message: %s", pretty.Sdump(blockHashes))
-			assert.Equal(t, blockAnnouncement.Block.Hash(), blockHashes[0].Hash,
-				"wrong block hash in announcement",
-			)
-			return
-		case *NewPooledTransactionHashes:
-			// ignore old txs being propagated
-			continue
-		default:
-			t.Fatalf("unexpected: %s", pretty.Sdump(msg))
-		}
-	}
-}
-
-// waitForBlock66 waits for confirmation from the client that it has
-// imported the given block.
-func (c *Conn) waitForBlock66(block *types.Block) error {
-	defer c.SetReadDeadline(time.Time{})
-
-	c.SetReadDeadline(time.Now().Add(20 * time.Second))
-	// note: if the node has not yet imported the block, it will respond
-	// to the GetBlockHeaders request with an empty BlockHeaders response,
-	// so the GetBlockHeaders request must be sent again until the BlockHeaders
-	// response contains the desired header.
-	for {
-		req := eth.GetBlockHeadersPacket66{
-			RequestId: 54,
-			GetBlockHeadersPacket: &eth.GetBlockHeadersPacket{
-				Origin: eth.HashOrNumber{
-					Hash: block.Hash(),
-				},
-				Amount: 1,
-			},
-		}
-		if err := c.write66(req, GetBlockHeaders{}.Code()); err != nil {
-			return err
-		}
-
-		reqID, msg := c.read66()
-		// check message
-		switch msg := msg.(type) {
-		case BlockHeaders:
-			// check request ID
-			if reqID != req.RequestId {
-				return fmt.Errorf("request ID mismatch: wanted %d, got %d", req.RequestId, reqID)
-			}
-			for _, header := range msg {
-				if header.Number.Uint64() == block.NumberU64() {
-					return nil
-				}
-			}
-			time.Sleep(100 * time.Millisecond)
-		case *NewPooledTransactionHashes:
-			// ignore old announcements
-			continue
-		default:
-			return fmt.Errorf("invalid message: %s", pretty.Sdump(msg))
-		}
-	}
-}
-
-func sendSuccessfulTx66(t *utesting.T, s *Suite, tx *types.Transaction) {
-	sendConn := s.setupConnection66(t)
-	defer sendConn.Close()
-	sendSuccessfulTxWithConn(t, s, tx, sendConn)
-}
-
-// waitForBlockHeadersResponse66 waits for a BlockHeaders message with the given expected request ID
-func (s *Suite) waitForBlockHeadersResponse66(conn *Conn, expectedID uint64) (BlockHeaders, error) {
-	reqID, msg := conn.readAndServe66(s.chain, timeout)
-	switch msg := msg.(type) {
-	case BlockHeaders:
-		if reqID != expectedID {
-			return nil, fmt.Errorf("request ID mismatch: wanted %d, got %d", expectedID, reqID)
-		}
-		return msg, nil
-	default:
-		return nil, fmt.Errorf("unexpected: %s", pretty.Sdump(msg))
-	}
-}
-
-func (s *Suite) getBlockHeaders66(conn *Conn, req eth.Packet, expectedID uint64) (BlockHeaders, error) {
-	if err := conn.write66(req, GetBlockHeaders{}.Code()); err != nil {
-		return nil, fmt.Errorf("could not write to connection: %v", err)
-	}
-	return s.waitForBlockHeadersResponse66(conn, expectedID)
-}
-
-func headersMatch(t *utesting.T, chain *Chain, headers BlockHeaders) bool {
-	mismatched := 0
-	for _, header := range headers {
-		num := header.Number.Uint64()
-		t.Logf("received header (%d): %s", num, pretty.Sdump(header.Hash()))
-		if !reflect.DeepEqual(chain.blocks[int(num)].Header(), header) {
-			mismatched += 1
-			t.Logf("received wrong header: %v", pretty.Sdump(header))
-		}
-	}
-	return mismatched == 0
-}
-
-func (s *Suite) sendNextBlock66(t *utesting.T) {
-	sendConn, receiveConn := s.setupConnection66(t), s.setupConnection66(t)
-	defer sendConn.Close()
-	defer receiveConn.Close()
-
-	// create new block announcement
-	nextBlock := len(s.chain.blocks)
-	blockAnnouncement := &NewBlock{
-		Block: s.fullChain.blocks[nextBlock],
-		TD:    s.fullChain.TD(nextBlock + 1),
-	}
-	// send announcement and wait for node to request the header
-	s.testAnnounce66(t, sendConn, receiveConn, blockAnnouncement)
-	// wait for client to update its chain
-	if err := receiveConn.waitForBlock66(s.fullChain.blocks[nextBlock]); err != nil {
-		t.Fatal(err)
-	}
-	// update test suite chain
-	s.chain.blocks = append(s.chain.blocks, s.fullChain.blocks[nextBlock])
-}
--- a/cmd/devp2p/internal/ethtest/helpers.go
+++ b/cmd/devp2p/internal/ethtest/helpers.go
@@ -0,0 +1,789 @@
+// Copyright 2020 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package ethtest
+
+import (
+	"fmt"
+	"net"
+	"reflect"
+	"strings"
+	"time"
+
+	"github.com/davecgh/go-spew/spew"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/eth/protocols/eth"
+	"github.com/ethereum/go-ethereum/internal/utesting"
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/p2p/rlpx"
+)
+
+var (
+	pretty = spew.ConfigState{
+		Indent:                  "  ",
+		DisableCapacities:       true,
+		DisablePointerAddresses: true,
+		SortKeys:                true,
+	}
+	timeout = 20 * time.Second
+)
+
+// Is_66 checks if the node supports the eth66 protocol version,
+// and if not, exists the test suite
+func (s *Suite) Is_66(t *utesting.T) {
+	conn, err := s.dial66()
+	if err != nil {
+		t.Fatalf("dial failed: %v", err)
+	}
+	if err := conn.handshake(); err != nil {
+		t.Fatalf("handshake failed: %v", err)
+	}
+	if conn.negotiatedProtoVersion < 66 {
+		t.Fail()
+	}
+}
+
+// dial attempts to dial the given node and perform a handshake,
+// returning the created Conn if successful.
+func (s *Suite) dial() (*Conn, error) {
+	// dial
+	fd, err := net.Dial("tcp", fmt.Sprintf("%v:%d", s.Dest.IP(), s.Dest.TCP()))
+	if err != nil {
+		return nil, err
+	}
+	conn := Conn{Conn: rlpx.NewConn(fd, s.Dest.Pubkey())}
+	// do encHandshake
+	conn.ourKey, _ = crypto.GenerateKey()
+	_, err = conn.Handshake(conn.ourKey)
+	if err != nil {
+		conn.Close()
+		return nil, err
+	}
+	// set default p2p capabilities
+	conn.caps = []p2p.Cap{
+		{Name: "eth", Version: 64},
+		{Name: "eth", Version: 65},
+	}
+	conn.ourHighestProtoVersion = 65
+	return &conn, nil
+}
+
+// dial66 attempts to dial the given node and perform a handshake,
+// returning the created Conn with additional eth66 capabilities if
+// successful
+func (s *Suite) dial66() (*Conn, error) {
+	conn, err := s.dial()
+	if err != nil {
+		return nil, fmt.Errorf("dial failed: %v", err)
+	}
+	conn.caps = append(conn.caps, p2p.Cap{Name: "eth", Version: 66})
+	conn.ourHighestProtoVersion = 66
+	return conn, nil
+}
+
+// dial66 attempts to dial the given node and perform a handshake,
+// returning the created Conn with additional snap/1 capabilities if
+// successful.
+func (s *Suite) dialSnap() (*Conn, error) {
+	conn, err := s.dial66()
+	if err != nil {
+		return nil, fmt.Errorf("dial failed: %v", err)
+	}
+	conn.caps = append(conn.caps, p2p.Cap{Name: "snap", Version: 1})
+	conn.ourHighestSnapProtoVersion = 1
+	return conn, nil
+}
+
+// peer performs both the protocol handshake and the status message
+// exchange with the node in order to peer with it.
+func (c *Conn) peer(chain *Chain, status *Status) error {
+	if err := c.handshake(); err != nil {
+		return fmt.Errorf("handshake failed: %v", err)
+	}
+	if _, err := c.statusExchange(chain, status); err != nil {
+		return fmt.Errorf("status exchange failed: %v", err)
+	}
+	return nil
+}
+
+// handshake performs a protocol handshake with the node.
+func (c *Conn) handshake() error {
+	defer c.SetDeadline(time.Time{})
+	c.SetDeadline(time.Now().Add(10 * time.Second))
+	// write hello to client
+	pub0 := crypto.FromECDSAPub(&c.ourKey.PublicKey)[1:]
+	ourHandshake := &Hello{
+		Version: 5,
+		Caps:    c.caps,
+		ID:      pub0,
+	}
+	if err := c.Write(ourHandshake); err != nil {
+		return fmt.Errorf("write to connection failed: %v", err)
+	}
+	// read hello from client
+	switch msg := c.Read().(type) {
+	case *Hello:
+		// set snappy if version is at least 5
+		if msg.Version >= 5 {
+			c.SetSnappy(true)
+		}
+		c.negotiateEthProtocol(msg.Caps)
+		if c.negotiatedProtoVersion == 0 {
+			return fmt.Errorf("could not negotiate eth protocol (remote caps: %v, local eth version: %v)", msg.Caps, c.ourHighestProtoVersion)
+		}
+		// If we require snap, verify that it was negotiated
+		if c.ourHighestSnapProtoVersion != c.negotiatedSnapProtoVersion {
+			return fmt.Errorf("could not negotiate snap protocol (remote caps: %v, local snap version: %v)", msg.Caps, c.ourHighestSnapProtoVersion)
+		}
+		return nil
+	default:
+		return fmt.Errorf("bad handshake: %#v", msg)
+	}
+}
+
+// negotiateEthProtocol sets the Conn's eth protocol version to highest
+// advertised capability from peer.
+func (c *Conn) negotiateEthProtocol(caps []p2p.Cap) {
+	var highestEthVersion uint
+	var highestSnapVersion uint
+	for _, capability := range caps {
+		switch capability.Name {
+		case "eth":
+			if capability.Version > highestEthVersion && capability.Version <= c.ourHighestProtoVersion {
+				highestEthVersion = capability.Version
+			}
+		case "snap":
+			if capability.Version > highestSnapVersion && capability.Version <= c.ourHighestSnapProtoVersion {
+				highestSnapVersion = capability.Version
+			}
+		}
+	}
+	c.negotiatedProtoVersion = highestEthVersion
+	c.negotiatedSnapProtoVersion = highestSnapVersion
+}
+
+// statusExchange performs a `Status` message exchange with the given node.
+func (c *Conn) statusExchange(chain *Chain, status *Status) (Message, error) {
+	defer c.SetDeadline(time.Time{})
+	c.SetDeadline(time.Now().Add(20 * time.Second))
+
+	// read status message from client
+	var message Message
+loop:
+	for {
+		switch msg := c.Read().(type) {
+		case *Status:
+			if have, want := msg.Head, chain.blocks[chain.Len()-1].Hash(); have != want {
+				return nil, fmt.Errorf("wrong head block in status, want:  %#x (block %d) have %#x",
+					want, chain.blocks[chain.Len()-1].NumberU64(), have)
+			}
+			if have, want := msg.TD.Cmp(chain.TD()), 0; have != want {
+				return nil, fmt.Errorf("wrong TD in status: have %v want %v", have, want)
+			}
+			if have, want := msg.ForkID, chain.ForkID(); !reflect.DeepEqual(have, want) {
+				return nil, fmt.Errorf("wrong fork ID in status: have %v, want %v", have, want)
+			}
+			if have, want := msg.ProtocolVersion, c.ourHighestProtoVersion; have != uint32(want) {
+				return nil, fmt.Errorf("wrong protocol version: have %v, want %v", have, want)
+			}
+			message = msg
+			break loop
+		case *Disconnect:
+			return nil, fmt.Errorf("disconnect received: %v", msg.Reason)
+		case *Ping:
+			c.Write(&Pong{}) // TODO (renaynay): in the future, this should be an error
+			// (PINGs should not be a response upon fresh connection)
+		default:
+			return nil, fmt.Errorf("bad status message: %s", pretty.Sdump(msg))
+		}
+	}
+	// make sure eth protocol version is set for negotiation
+	if c.negotiatedProtoVersion == 0 {
+		return nil, fmt.Errorf("eth protocol version must be set in Conn")
+	}
+	if status == nil {
+		// default status message
+		status = &Status{
+			ProtocolVersion: uint32(c.negotiatedProtoVersion),
+			NetworkID:       chain.chainConfig.ChainID.Uint64(),
+			TD:              chain.TD(),
+			Head:            chain.blocks[chain.Len()-1].Hash(),
+			Genesis:         chain.blocks[0].Hash(),
+			ForkID:          chain.ForkID(),
+		}
+	}
+	if err := c.Write(status); err != nil {
+		return nil, fmt.Errorf("write to connection failed: %v", err)
+	}
+	return message, nil
+}
+
+// createSendAndRecvConns creates two connections, one for sending messages to the
+// node, and one for receiving messages from the node.
+func (s *Suite) createSendAndRecvConns(isEth66 bool) (*Conn, *Conn, error) {
+	var (
+		sendConn *Conn
+		recvConn *Conn
+		err      error
+	)
+	if isEth66 {
+		sendConn, err = s.dial66()
+		if err != nil {
+			return nil, nil, fmt.Errorf("dial failed: %v", err)
+		}
+		recvConn, err = s.dial66()
+		if err != nil {
+			sendConn.Close()
+			return nil, nil, fmt.Errorf("dial failed: %v", err)
+		}
+	} else {
+		sendConn, err = s.dial()
+		if err != nil {
+			return nil, nil, fmt.Errorf("dial failed: %v", err)
+		}
+		recvConn, err = s.dial()
+		if err != nil {
+			sendConn.Close()
+			return nil, nil, fmt.Errorf("dial failed: %v", err)
+		}
+	}
+	return sendConn, recvConn, nil
+}
+
+func (c *Conn) readAndServe(chain *Chain, timeout time.Duration) Message {
+	if c.negotiatedProtoVersion == 66 {
+		_, msg := c.readAndServe66(chain, timeout)
+		return msg
+	}
+	return c.readAndServe65(chain, timeout)
+}
+
+// readAndServe serves GetBlockHeaders requests while waiting
+// on another message from the node.
+func (c *Conn) readAndServe65(chain *Chain, timeout time.Duration) Message {
+	start := time.Now()
+	for time.Since(start) < timeout {
+		c.SetReadDeadline(time.Now().Add(5 * time.Second))
+		switch msg := c.Read().(type) {
+		case *Ping:
+			c.Write(&Pong{})
+		case *GetBlockHeaders:
+			req := *msg
+			headers, err := chain.GetHeaders(req)
+			if err != nil {
+				return errorf("could not get headers for inbound header request: %v", err)
+			}
+			if err := c.Write(headers); err != nil {
+				return errorf("could not write to connection: %v", err)
+			}
+		default:
+			return msg
+		}
+	}
+	return errorf("no message received within %v", timeout)
+}
+
+// readAndServe66 serves eth66 GetBlockHeaders requests while waiting
+// on another message from the node.
+func (c *Conn) readAndServe66(chain *Chain, timeout time.Duration) (uint64, Message) {
+	start := time.Now()
+	for time.Since(start) < timeout {
+		c.SetReadDeadline(time.Now().Add(10 * time.Second))
+
+		reqID, msg := c.Read66()
+
+		switch msg := msg.(type) {
+		case *Ping:
+			c.Write(&Pong{})
+		case GetBlockHeaders:
+			headers, err := chain.GetHeaders(msg)
+			if err != nil {
+				return 0, errorf("could not get headers for inbound header request: %v", err)
+			}
+			resp := &eth.BlockHeadersPacket66{
+				RequestId:          reqID,
+				BlockHeadersPacket: eth.BlockHeadersPacket(headers),
+			}
+			if err := c.Write66(resp, BlockHeaders{}.Code()); err != nil {
+				return 0, errorf("could not write to connection: %v", err)
+			}
+		default:
+			return reqID, msg
+		}
+	}
+	return 0, errorf("no message received within %v", timeout)
+}
+
+// headersRequest executes the given `GetBlockHeaders` request.
+func (c *Conn) headersRequest(request *GetBlockHeaders, chain *Chain, isEth66 bool, reqID uint64) (BlockHeaders, error) {
+	defer c.SetReadDeadline(time.Time{})
+	c.SetReadDeadline(time.Now().Add(20 * time.Second))
+	// if on eth66 connection, perform eth66 GetBlockHeaders request
+	if isEth66 {
+		return getBlockHeaders66(chain, c, request, reqID)
+	}
+	if err := c.Write(request); err != nil {
+		return nil, err
+	}
+	switch msg := c.readAndServe(chain, timeout).(type) {
+	case *BlockHeaders:
+		return *msg, nil
+	default:
+		return nil, fmt.Errorf("invalid message: %s", pretty.Sdump(msg))
+	}
+}
+
+func (c *Conn) snapRequest(msg Message, id uint64, chain *Chain) (Message, error) {
+	defer c.SetReadDeadline(time.Time{})
+	c.SetReadDeadline(time.Now().Add(5 * time.Second))
+	if err := c.Write(msg); err != nil {
+		return nil, fmt.Errorf("could not write to connection: %v", err)
+	}
+	return c.ReadSnap(id)
+}
+
+// getBlockHeaders66 executes the given `GetBlockHeaders` request over the eth66 protocol.
+func getBlockHeaders66(chain *Chain, conn *Conn, request *GetBlockHeaders, id uint64) (BlockHeaders, error) {
+	// write request
+	packet := eth.GetBlockHeadersPacket(*request)
+	req := &eth.GetBlockHeadersPacket66{
+		RequestId:             id,
+		GetBlockHeadersPacket: &packet,
+	}
+	if err := conn.Write66(req, GetBlockHeaders{}.Code()); err != nil {
+		return nil, fmt.Errorf("could not write to connection: %v", err)
+	}
+	// wait for response
+	msg := conn.waitForResponse(chain, timeout, req.RequestId)
+	headers, ok := msg.(BlockHeaders)
+	if !ok {
+		return nil, fmt.Errorf("unexpected message received: %s", pretty.Sdump(msg))
+	}
+	return headers, nil
+}
+
+// headersMatch returns whether the received headers match the given request
+func headersMatch(expected BlockHeaders, headers BlockHeaders) bool {
+	return reflect.DeepEqual(expected, headers)
+}
+
+// waitForResponse reads from the connection until a response with the expected
+// request ID is received.
+func (c *Conn) waitForResponse(chain *Chain, timeout time.Duration, requestID uint64) Message {
+	for {
+		id, msg := c.readAndServe66(chain, timeout)
+		if id == requestID {
+			return msg
+		}
+	}
+}
+
+// sendNextBlock broadcasts the next block in the chain and waits
+// for the node to propagate the block and import it into its chain.
+func (s *Suite) sendNextBlock(isEth66 bool) error {
+	// set up sending and receiving connections
+	sendConn, recvConn, err := s.createSendAndRecvConns(isEth66)
+	if err != nil {
+		return err
+	}
+	defer sendConn.Close()
+	defer recvConn.Close()
+	if err = sendConn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
+	}
+	if err = recvConn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
+	}
+	// create new block announcement
+	nextBlock := s.fullChain.blocks[s.chain.Len()]
+	blockAnnouncement := &NewBlock{
+		Block: nextBlock,
+		TD:    s.fullChain.TotalDifficultyAt(s.chain.Len()),
+	}
+	// send announcement and wait for node to request the header
+	if err = s.testAnnounce(sendConn, recvConn, blockAnnouncement); err != nil {
+		return fmt.Errorf("failed to announce block: %v", err)
+	}
+	// wait for client to update its chain
+	if err = s.waitForBlockImport(recvConn, nextBlock, isEth66); err != nil {
+		return fmt.Errorf("failed to receive confirmation of block import: %v", err)
+	}
+	// update test suite chain
+	s.chain.blocks = append(s.chain.blocks, nextBlock)
+	return nil
+}
+
+// testAnnounce writes a block announcement to the node and waits for the node
+// to propagate it.
+func (s *Suite) testAnnounce(sendConn, receiveConn *Conn, blockAnnouncement *NewBlock) error {
+	if err := sendConn.Write(blockAnnouncement); err != nil {
+		return fmt.Errorf("could not write to connection: %v", err)
+	}
+	return s.waitAnnounce(receiveConn, blockAnnouncement)
+}
+
+// waitAnnounce waits for a NewBlock or NewBlockHashes announcement from the node.
+func (s *Suite) waitAnnounce(conn *Conn, blockAnnouncement *NewBlock) error {
+	for {
+		switch msg := conn.readAndServe(s.chain, timeout).(type) {
+		case *NewBlock:
+			if !reflect.DeepEqual(blockAnnouncement.Block.Header(), msg.Block.Header()) {
+				return fmt.Errorf("wrong header in block announcement: \nexpected %v "+
+					"\ngot %v", blockAnnouncement.Block.Header(), msg.Block.Header())
+			}
+			if !reflect.DeepEqual(blockAnnouncement.TD, msg.TD) {
+				return fmt.Errorf("wrong TD in announcement: expected %v, got %v", blockAnnouncement.TD, msg.TD)
+			}
+			return nil
+		case *NewBlockHashes:
+			hashes := *msg
+			if blockAnnouncement.Block.Hash() != hashes[0].Hash {
+				return fmt.Errorf("wrong block hash in announcement: expected %v, got %v", blockAnnouncement.Block.Hash(), hashes[0].Hash)
+			}
+			return nil
+		case *NewPooledTransactionHashes:
+			// ignore tx announcements from previous tests
+			continue
+		default:
+			return fmt.Errorf("unexpected: %s", pretty.Sdump(msg))
+		}
+	}
+}
+
+func (s *Suite) waitForBlockImport(conn *Conn, block *types.Block, isEth66 bool) error {
+	defer conn.SetReadDeadline(time.Time{})
+	conn.SetReadDeadline(time.Now().Add(20 * time.Second))
+	// create request
+	req := &GetBlockHeaders{
+		Origin: eth.HashOrNumber{
+			Hash: block.Hash(),
+		},
+		Amount: 1,
+	}
+	// loop until BlockHeaders response contains desired block, confirming the
+	// node imported the block
+	for {
+		var (
+			headers BlockHeaders
+			err     error
+		)
+		if isEth66 {
+			requestID := uint64(54)
+			headers, err = conn.headersRequest(req, s.chain, eth66, requestID)
+		} else {
+			headers, err = conn.headersRequest(req, s.chain, eth65, 0)
+		}
+		if err != nil {
+			return fmt.Errorf("GetBlockHeader request failed: %v", err)
+		}
+		// if headers response is empty, node hasn't imported block yet, try again
+		if len(headers) == 0 {
+			time.Sleep(100 * time.Millisecond)
+			continue
+		}
+		if !reflect.DeepEqual(block.Header(), headers[0]) {
+			return fmt.Errorf("wrong header returned: wanted %v, got %v", block.Header(), headers[0])
+		}
+		return nil
+	}
+}
+
+func (s *Suite) oldAnnounce(isEth66 bool) error {
+	sendConn, receiveConn, err := s.createSendAndRecvConns(isEth66)
+	if err != nil {
+		return err
+	}
+	defer sendConn.Close()
+	defer receiveConn.Close()
+	if err := sendConn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
+	}
+	if err := receiveConn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
+	}
+	// create old block announcement
+	oldBlockAnnounce := &NewBlock{
+		Block: s.chain.blocks[len(s.chain.blocks)/2],
+		TD:    s.chain.blocks[len(s.chain.blocks)/2].Difficulty(),
+	}
+	if err := sendConn.Write(oldBlockAnnounce); err != nil {
+		return fmt.Errorf("could not write to connection: %v", err)
+	}
+	// wait to see if the announcement is propagated
+	switch msg := receiveConn.readAndServe(s.chain, time.Second*8).(type) {
+	case *NewBlock:
+		block := *msg
+		if block.Block.Hash() == oldBlockAnnounce.Block.Hash() {
+			return fmt.Errorf("unexpected: block propagated: %s", pretty.Sdump(msg))
+		}
+	case *NewBlockHashes:
+		hashes := *msg
+		for _, hash := range hashes {
+			if hash.Hash == oldBlockAnnounce.Block.Hash() {
+				return fmt.Errorf("unexpected: block announced: %s", pretty.Sdump(msg))
+			}
+		}
+	case *Error:
+		errMsg := *msg
+		// check to make sure error is timeout (propagation didn't come through == test successful)
+		if !strings.Contains(errMsg.String(), "timeout") {
+			return fmt.Errorf("unexpected error: %v", pretty.Sdump(msg))
+		}
+	default:
+		return fmt.Errorf("unexpected: %s", pretty.Sdump(msg))
+	}
+	return nil
+}
+
+func (s *Suite) maliciousHandshakes(t *utesting.T, isEth66 bool) error {
+	var (
+		conn *Conn
+		err  error
+	)
+	if isEth66 {
+		conn, err = s.dial66()
+		if err != nil {
+			return fmt.Errorf("dial failed: %v", err)
+		}
+	} else {
+		conn, err = s.dial()
+		if err != nil {
+			return fmt.Errorf("dial failed: %v", err)
+		}
+	}
+	defer conn.Close()
+	// write hello to client
+	pub0 := crypto.FromECDSAPub(&conn.ourKey.PublicKey)[1:]
+	handshakes := []*Hello{
+		{
+			Version: 5,
+			Caps: []p2p.Cap{
+				{Name: largeString(2), Version: 64},
+			},
+			ID: pub0,
+		},
+		{
+			Version: 5,
+			Caps: []p2p.Cap{
+				{Name: "eth", Version: 64},
+				{Name: "eth", Version: 65},
+			},
+			ID: append(pub0, byte(0)),
+		},
+		{
+			Version: 5,
+			Caps: []p2p.Cap{
+				{Name: "eth", Version: 64},
+				{Name: "eth", Version: 65},
+			},
+			ID: append(pub0, pub0...),
+		},
+		{
+			Version: 5,
+			Caps: []p2p.Cap{
+				{Name: "eth", Version: 64},
+				{Name: "eth", Version: 65},
+			},
+			ID: largeBuffer(2),
+		},
+		{
+			Version: 5,
+			Caps: []p2p.Cap{
+				{Name: largeString(2), Version: 64},
+			},
+			ID: largeBuffer(2),
+		},
+	}
+	for i, handshake := range handshakes {
+		t.Logf("Testing malicious handshake %v\n", i)
+		if err := conn.Write(handshake); err != nil {
+			return fmt.Errorf("could not write to connection: %v", err)
+		}
+		// check that the peer disconnected
+		for i := 0; i < 2; i++ {
+			switch msg := conn.readAndServe(s.chain, 20*time.Second).(type) {
+			case *Disconnect:
+			case *Error:
+			case *Hello:
+				// Discard one hello as Hello's are sent concurrently
+				continue
+			default:
+				return fmt.Errorf("unexpected: %s", pretty.Sdump(msg))
+			}
+		}
+		// dial for the next round
+		if isEth66 {
+			conn, err = s.dial66()
+			if err != nil {
+				return fmt.Errorf("dial failed: %v", err)
+			}
+		} else {
+			conn, err = s.dial()
+			if err != nil {
+				return fmt.Errorf("dial failed: %v", err)
+			}
+		}
+	}
+	return nil
+}
+
+func (s *Suite) maliciousStatus(conn *Conn) error {
+	if err := conn.handshake(); err != nil {
+		return fmt.Errorf("handshake failed: %v", err)
+	}
+	status := &Status{
+		ProtocolVersion: uint32(conn.negotiatedProtoVersion),
+		NetworkID:       s.chain.chainConfig.ChainID.Uint64(),
+		TD:              largeNumber(2),
+		Head:            s.chain.blocks[s.chain.Len()-1].Hash(),
+		Genesis:         s.chain.blocks[0].Hash(),
+		ForkID:          s.chain.ForkID(),
+	}
+	// get status
+	msg, err := conn.statusExchange(s.chain, status)
+	if err != nil {
+		return fmt.Errorf("status exchange failed: %v", err)
+	}
+	switch msg := msg.(type) {
+	case *Status:
+	default:
+		return fmt.Errorf("expected status, got: %#v ", msg)
+	}
+	// wait for disconnect
+	switch msg := conn.readAndServe(s.chain, timeout).(type) {
+	case *Disconnect:
+		return nil
+	case *Error:
+		return nil
+	default:
+		return fmt.Errorf("expected disconnect, got: %s", pretty.Sdump(msg))
+	}
+}
+
+func (s *Suite) hashAnnounce(isEth66 bool) error {
+	// create connections
+	sendConn, recvConn, err := s.createSendAndRecvConns(isEth66)
+	if err != nil {
+		return fmt.Errorf("failed to create connections: %v", err)
+	}
+	defer sendConn.Close()
+	defer recvConn.Close()
+	if err := sendConn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
+	}
+	if err := recvConn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
+	}
+	// create NewBlockHashes announcement
+	type anno struct {
+		Hash   common.Hash // Hash of one particular block being announced
+		Number uint64      // Number of one particular block being announced
+	}
+	nextBlock := s.fullChain.blocks[s.chain.Len()]
+	announcement := anno{Hash: nextBlock.Hash(), Number: nextBlock.Number().Uint64()}
+	newBlockHash := &NewBlockHashes{announcement}
+	if err := sendConn.Write(newBlockHash); err != nil {
+		return fmt.Errorf("failed to write to connection: %v", err)
+	}
+	// Announcement sent, now wait for a header request
+	var (
+		id             uint64
+		msg            Message
+		blockHeaderReq GetBlockHeaders
+	)
+	if isEth66 {
+		id, msg = sendConn.Read66()
+		switch msg := msg.(type) {
+		case GetBlockHeaders:
+			blockHeaderReq = msg
+		default:
+			return fmt.Errorf("unexpected %s", pretty.Sdump(msg))
+		}
+		if blockHeaderReq.Amount != 1 {
+			return fmt.Errorf("unexpected number of block headers requested: %v", blockHeaderReq.Amount)
+		}
+		if blockHeaderReq.Origin.Hash != announcement.Hash {
+			return fmt.Errorf("unexpected block header requested. Announced:\n %v\n Remote request:\n%v",
+				pretty.Sdump(announcement),
+				pretty.Sdump(blockHeaderReq))
+		}
+		if err := sendConn.Write66(&eth.BlockHeadersPacket66{
+			RequestId: id,
+			BlockHeadersPacket: eth.BlockHeadersPacket{
+				nextBlock.Header(),
+			},
+		}, BlockHeaders{}.Code()); err != nil {
+			return fmt.Errorf("failed to write to connection: %v", err)
+		}
+	} else {
+		msg = sendConn.Read()
+		switch msg := msg.(type) {
+		case *GetBlockHeaders:
+			blockHeaderReq = *msg
+		default:
+			return fmt.Errorf("unexpected %s", pretty.Sdump(msg))
+		}
+		if blockHeaderReq.Amount != 1 {
+			return fmt.Errorf("unexpected number of block headers requested: %v", blockHeaderReq.Amount)
+		}
+		if blockHeaderReq.Origin.Hash != announcement.Hash {
+			return fmt.Errorf("unexpected block header requested. Announced:\n %v\n Remote request:\n%v",
+				pretty.Sdump(announcement),
+				pretty.Sdump(blockHeaderReq))
+		}
+		if err := sendConn.Write(&BlockHeaders{nextBlock.Header()}); err != nil {
+			return fmt.Errorf("failed to write to connection: %v", err)
+		}
+	}
+	// wait for block announcement
+	msg = recvConn.readAndServe(s.chain, timeout)
+	switch msg := msg.(type) {
+	case *NewBlockHashes:
+		hashes := *msg
+		if len(hashes) != 1 {
+			return fmt.Errorf("unexpected new block hash announcement: wanted 1 announcement, got %d", len(hashes))
+		}
+		if nextBlock.Hash() != hashes[0].Hash {
+			return fmt.Errorf("unexpected block hash announcement, wanted %v, got %v", nextBlock.Hash(),
+				hashes[0].Hash)
+		}
+	case *NewBlock:
+		// node should only propagate NewBlock without having requested the body if the body is empty
+		nextBlockBody := nextBlock.Body()
+		if len(nextBlockBody.Transactions) != 0 || len(nextBlockBody.Uncles) != 0 {
+			return fmt.Errorf("unexpected non-empty new block propagated: %s", pretty.Sdump(msg))
+		}
+		if msg.Block.Hash() != nextBlock.Hash() {
+			return fmt.Errorf("mismatched hash of propagated new block: wanted %v, got %v",
+				nextBlock.Hash(), msg.Block.Hash())
+		}
+		// check to make sure header matches header that was sent to the node
+		if !reflect.DeepEqual(nextBlock.Header(), msg.Block.Header()) {
+			return fmt.Errorf("incorrect header received: wanted %v, got %v", nextBlock.Header(), msg.Block.Header())
+		}
+	default:
+		return fmt.Errorf("unexpected: %s", pretty.Sdump(msg))
+	}
+	// confirm node imported block
+	if err := s.waitForBlockImport(recvConn, nextBlock, isEth66); err != nil {
+		return fmt.Errorf("error waiting for node to import new block: %v", err)
+	}
+	// update the chain
+	s.chain.blocks = append(s.chain.blocks, nextBlock)
+	return nil
+}
--- a/cmd/devp2p/internal/ethtest/snap.go
+++ b/cmd/devp2p/internal/ethtest/snap.go
@@ -0,0 +1,675 @@
+// Copyright 2014 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package ethtest
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"math/rand"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/eth/protocols/snap"
+	"github.com/ethereum/go-ethereum/internal/utesting"
+	"github.com/ethereum/go-ethereum/light"
+	"github.com/ethereum/go-ethereum/trie"
+	"golang.org/x/crypto/sha3"
+)
+
+func (s *Suite) TestSnapStatus(t *utesting.T) {
+	conn, err := s.dialSnap()
+	if err != nil {
+		t.Fatalf("dial failed: %v", err)
+	}
+	defer conn.Close()
+	if err := conn.peer(s.chain, nil); err != nil {
+		t.Fatalf("peering failed: %v", err)
+	}
+}
+
+type accRangeTest struct {
+	nBytes uint64
+	root   common.Hash
+	origin common.Hash
+	limit  common.Hash
+
+	expAccounts int
+	expFirst    common.Hash
+	expLast     common.Hash
+}
+
+// TestSnapGetAccountRange various forms of GetAccountRange requests.
+func (s *Suite) TestSnapGetAccountRange(t *utesting.T) {
+	var (
+		root           = s.chain.RootAt(999)
+		ffHash         = common.HexToHash("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")
+		zero           = common.Hash{}
+		firstKeyMinus1 = common.HexToHash("0x00bf49f440a1cd0527e4d06e2765654c0f56452257516d793a9b8d604dcfdf29")
+		firstKey       = common.HexToHash("0x00bf49f440a1cd0527e4d06e2765654c0f56452257516d793a9b8d604dcfdf2a")
+		firstKeyPlus1  = common.HexToHash("0x00bf49f440a1cd0527e4d06e2765654c0f56452257516d793a9b8d604dcfdf2b")
+		secondKey      = common.HexToHash("0x09e47cd5056a689e708f22fe1f932709a320518e444f5f7d8d46a3da523d6606")
+		storageRoot    = common.HexToHash("0xbe3d75a1729be157e79c3b77f00206db4d54e3ea14375a015451c88ec067c790")
+	)
+	for i, tc := range []accRangeTest{
+		// Tests decreasing the number of bytes
+		{4000, root, zero, ffHash, 76, firstKey, common.HexToHash("0xd2669dcf3858e7f1eecb8b5fedbf22fbea3e9433848a75035f79d68422c2dcda")},
+		{3000, root, zero, ffHash, 57, firstKey, common.HexToHash("0x9b63fa753ece5cb90657d02ecb15df4dc1508d8c1d187af1bf7f1a05e747d3c7")},
+		{2000, root, zero, ffHash, 38, firstKey, common.HexToHash("0x5e6140ecae4354a9e8f47559a8c6209c1e0e69cb077b067b528556c11698b91f")},
+		{1, root, zero, ffHash, 1, firstKey, firstKey},
+
+		// Tests variations of the range
+		//
+		// [00b to firstkey]: should return [firstkey, secondkey], where secondkey is out of bounds
+		{4000, root, common.HexToHash("0x00bf000000000000000000000000000000000000000000000000000000000000"), common.HexToHash("0x00bf49f440a1cd0527e4d06e2765654c0f56452257516d793a9b8d604dcfdf2b"), 2, firstKey, secondKey},
+		// [00b0 to 0bf0]: where both are before firstkey. Should return firstKey (even though it's out of bounds)
+		{4000, root, common.HexToHash("0x00b0000000000000000000000000000000000000000000000000000000000000"), common.HexToHash("0x00bf100000000000000000000000000000000000000000000000000000000000"), 1, firstKey, firstKey},
+		{4000, root, zero, zero, 1, firstKey, firstKey},
+		{4000, root, firstKey, ffHash, 76, firstKey, common.HexToHash("0xd2669dcf3858e7f1eecb8b5fedbf22fbea3e9433848a75035f79d68422c2dcda")},
+		{4000, root, firstKeyPlus1, ffHash, 76, secondKey, common.HexToHash("0xd28f55d3b994f16389f36944ad685b48e0fc3f8fbe86c3ca92ebecadf16a783f")},
+
+		// Test different root hashes
+		//
+		// A stateroot that does not exist
+		{4000, common.Hash{0x13, 37}, zero, ffHash, 0, zero, zero},
+		// The genesis stateroot (we expect it to not be served)
+		{4000, s.chain.RootAt(0), zero, ffHash, 0, zero, zero},
+		// A 127 block old stateroot, expected to be served
+		{4000, s.chain.RootAt(999 - 127), zero, ffHash, 77, firstKey, common.HexToHash("0xe4c6fdef5dd4e789a2612390806ee840b8ec0fe52548f8b4efe41abb20c37aac")},
+		// A root which is not actually an account root, but a storage orot
+		{4000, storageRoot, zero, ffHash, 0, zero, zero},
+
+		// And some non-sensical requests
+		//
+		// range from [0xFF to 0x00], wrong order. Expect not to be serviced
+		{4000, root, ffHash, zero, 0, zero, zero},
+		// range from [firstkey, firstkey-1], wrong order. Expect to get first key.
+		{4000, root, firstKey, firstKeyMinus1, 1, firstKey, firstKey},
+		// range from [firstkey, 0], wrong order. Expect to get first key.
+		{4000, root, firstKey, zero, 1, firstKey, firstKey},
+		// Max bytes: 0. Expect to deliver one account.
+		{0, root, zero, ffHash, 1, firstKey, firstKey},
+	} {
+		if err := s.snapGetAccountRange(t, &tc); err != nil {
+			t.Errorf("test %d \n root: %x\n range: %#x - %#x\n bytes: %d\nfailed: %v", i, tc.root, tc.origin, tc.limit, tc.nBytes, err)
+		}
+	}
+}
+
+type stRangesTest struct {
+	root     common.Hash
+	accounts []common.Hash
+	origin   []byte
+	limit    []byte
+	nBytes   uint64
+
+	expSlots int
+}
+
+// TestSnapGetStorageRange various forms of GetStorageRanges requests.
+func (s *Suite) TestSnapGetStorageRanges(t *utesting.T) {
+	var (
+		ffHash    = common.HexToHash("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")
+		zero      = common.Hash{}
+		firstKey  = common.HexToHash("0x00bf49f440a1cd0527e4d06e2765654c0f56452257516d793a9b8d604dcfdf2a")
+		secondKey = common.HexToHash("0x09e47cd5056a689e708f22fe1f932709a320518e444f5f7d8d46a3da523d6606")
+	)
+	for i, tc := range []stRangesTest{
+		{
+			root:     s.chain.RootAt(999),
+			accounts: []common.Hash{secondKey, firstKey},
+			origin:   zero[:],
+			limit:    ffHash[:],
+			nBytes:   500,
+			expSlots: 0,
+		},
+
+		/*
+			Some tests against this account:
+			{
+			  "balance": "0",
+			  "nonce": 1,
+			  "root": "0xbe3d75a1729be157e79c3b77f00206db4d54e3ea14375a015451c88ec067c790",
+			  "codeHash": "0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470",
+			  "storage": {
+			    "0x405787fa12a823e0f2b7631cc41b3ba8828b3321ca811111fa75cd3aa3bb5ace": "02",
+			    "0xb10e2d527612073b26eecdfd717e6a320cf44b4afac2b0732d9fcbe2b7fa0cf6": "01",
+			    "0xc2575a0e9e593c00f959f8c92f12db2869c3395a3b0502d05e2516446f71f85b": "03"
+			  },
+			  "key": "0xf493f79c43bd747129a226ad42529885a4b108aba6046b2d12071695a6627844"
+			}
+		*/
+		{ // [:] -> [slot1, slot2, slot3]
+			root:     s.chain.RootAt(999),
+			accounts: []common.Hash{common.HexToHash("0xf493f79c43bd747129a226ad42529885a4b108aba6046b2d12071695a6627844")},
+			origin:   zero[:],
+			limit:    ffHash[:],
+			nBytes:   500,
+			expSlots: 3,
+		},
+		{ // [slot1:] -> [slot1, slot2, slot3]
+			root:     s.chain.RootAt(999),
+			accounts: []common.Hash{common.HexToHash("0xf493f79c43bd747129a226ad42529885a4b108aba6046b2d12071695a6627844")},
+			origin:   common.FromHex("0x405787fa12a823e0f2b7631cc41b3ba8828b3321ca811111fa75cd3aa3bb5ace"),
+			limit:    ffHash[:],
+			nBytes:   500,
+			expSlots: 3,
+		},
+		{ // [slot1+ :] -> [slot2, slot3]
+			root:     s.chain.RootAt(999),
+			accounts: []common.Hash{common.HexToHash("0xf493f79c43bd747129a226ad42529885a4b108aba6046b2d12071695a6627844")},
+			origin:   common.FromHex("0x405787fa12a823e0f2b7631cc41b3ba8828b3321ca811111fa75cd3aa3bb5acf"),
+			limit:    ffHash[:],
+			nBytes:   500,
+			expSlots: 2,
+		},
+		{ // [slot1:slot2] -> [slot1, slot2]
+			root:     s.chain.RootAt(999),
+			accounts: []common.Hash{common.HexToHash("0xf493f79c43bd747129a226ad42529885a4b108aba6046b2d12071695a6627844")},
+			origin:   common.FromHex("0x405787fa12a823e0f2b7631cc41b3ba8828b3321ca811111fa75cd3aa3bb5ace"),
+			limit:    common.FromHex("0xb10e2d527612073b26eecdfd717e6a320cf44b4afac2b0732d9fcbe2b7fa0cf6"),
+			nBytes:   500,
+			expSlots: 2,
+		},
+		{ // [slot1+:slot2+] -> [slot2, slot3]
+			root:     s.chain.RootAt(999),
+			accounts: []common.Hash{common.HexToHash("0xf493f79c43bd747129a226ad42529885a4b108aba6046b2d12071695a6627844")},
+			origin:   common.FromHex("0x4fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"),
+			limit:    common.FromHex("0xb10e2d527612073b26eecdfd717e6a320cf44b4afac2b0732d9fcbe2b7fa0cf7"),
+			nBytes:   500,
+			expSlots: 2,
+		},
+	} {
+		if err := s.snapGetStorageRanges(t, &tc); err != nil {
+			t.Errorf("test %d \n root: %x\n range: %#x - %#x\n bytes: %d\n #accounts: %d\nfailed: %v",
+				i, tc.root, tc.origin, tc.limit, tc.nBytes, len(tc.accounts), err)
+		}
+	}
+}
+
+type byteCodesTest struct {
+	nBytes uint64
+	hashes []common.Hash
+
+	expHashes int
+}
+
+var (
+	// emptyRoot is the known root hash of an empty trie.
+	emptyRoot = common.HexToHash("56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421")
+	// emptyCode is the known hash of the empty EVM bytecode.
+	emptyCode = common.HexToHash("c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470")
+)
+
+// TestSnapGetByteCodes various forms of GetByteCodes requests.
+func (s *Suite) TestSnapGetByteCodes(t *utesting.T) {
+	// The halfchain import should yield these bytecodes
+	var hcBytecodes []common.Hash
+	for _, s := range []string{
+		"0x200c90460d8b0063210d5f5b9918e053c8f2c024485e0f1b48be8b1fc71b1317",
+		"0x20ba67ed4ac6aff626e0d1d4db623e2fada9593daeefc4a6eb4b70e6cff986f3",
+		"0x24b5b4902cb3d897c1cee9f16be8e897d8fa277c04c6dc8214f18295fca5de44",
+		"0x320b9d0a2be39b8a1c858f9f8cb96b1df0983071681de07ded3a7c0d05db5fd6",
+		"0x48cb0d5275936a24632babc7408339f9f7b051274809de565b8b0db76e97e03c",
+		"0x67c7a6f5cdaa43b4baa0e15b2be63346d1b9ce9f2c3d7e5804e0cacd44ee3b04",
+		"0x6d8418059bdc8c3fabf445e6bfc662af3b6a4ae45999b953996e42c7ead2ab49",
+		"0x7043422e5795d03f17ee0463a37235258e609fdd542247754895d72695e3e142",
+		"0x727f9e6f0c4bac1ff8d72c2972122d9c8d37ccb37e04edde2339e8da193546f1",
+		"0x86ccd5e23c78568a8334e0cebaf3e9f48c998307b0bfb1c378cee83b4bfb29cb",
+		"0x8fc89b00d6deafd4c4279531e743365626dbfa28845ec697919d305c2674302d",
+		"0x92cfc353bcb9746bb6f9996b6b9df779c88af2e9e0eeac44879ca19887c9b732",
+		"0x941b4872104f0995a4898fcf0f615ea6bf46bfbdfcf63ea8f2fd45b3f3286b77",
+		"0xa02fe8f41159bb39d2b704c633c3d6389cf4bfcb61a2539a9155f60786cf815f",
+		"0xa4b94e0afdffcb0af599677709dac067d3145489ea7aede57672bee43e3b7373",
+		"0xaf4e64edd3234c1205b725e42963becd1085f013590bd7ed93f8d711c5eb65fb",
+		"0xb69a18fa855b742031420081999086f6fb56c3930ae8840944e8b8ae9931c51e",
+		"0xc246c217bc73ce6666c93a93a94faa5250564f50a3fdc27ea74c231c07fe2ca6",
+		"0xcd6e4ab2c3034df2a8a1dfaaeb1c4baecd162a93d22de35e854ee2945cbe0c35",
+		"0xe24b692d09d6fc2f3d1a6028c400a27c37d7cbb11511907c013946d6ce263d3b",
+		"0xe440c5f0e8603fd1ed25976eee261ccee8038cf79d6a4c0eb31b2bf883be737f",
+		"0xe6eacbc509203d21ac814b350e72934fde686b7f673c19be8cf956b0c70078ce",
+		"0xe8530de4371467b5be7ea0e69e675ab36832c426d6c1ce9513817c0f0ae1486b",
+		"0xe85d487abbbc83bf3423cf9731360cf4f5a37220e18e5add54e72ee20861196a",
+		"0xf195ea389a5eea28db0be93660014275b158963dec44af1dfa7d4743019a9a49",
+	} {
+		hcBytecodes = append(hcBytecodes, common.HexToHash(s))
+	}
+
+	for i, tc := range []byteCodesTest{
+		// A few stateroots
+		{
+			nBytes: 10000, hashes: []common.Hash{s.chain.RootAt(0), s.chain.RootAt(999)},
+			expHashes: 0,
+		},
+		{
+			nBytes: 10000, hashes: []common.Hash{s.chain.RootAt(0), s.chain.RootAt(0)},
+			expHashes: 0,
+		},
+		// Empties
+		{
+			nBytes: 10000, hashes: []common.Hash{emptyRoot},
+			expHashes: 0,
+		},
+		{
+			nBytes: 10000, hashes: []common.Hash{emptyCode},
+			expHashes: 1,
+		},
+		{
+			nBytes: 10000, hashes: []common.Hash{emptyCode, emptyCode, emptyCode},
+			expHashes: 3,
+		},
+		// The existing bytecodes
+		{
+			nBytes: 10000, hashes: hcBytecodes,
+			expHashes: len(hcBytecodes),
+		},
+		// The existing, with limited byte arg
+		{
+			nBytes: 1, hashes: hcBytecodes,
+			expHashes: 1,
+		},
+		{
+			nBytes: 0, hashes: hcBytecodes,
+			expHashes: 1,
+		},
+		{
+			nBytes: 1000, hashes: []common.Hash{hcBytecodes[0], hcBytecodes[0], hcBytecodes[0], hcBytecodes[0]},
+			expHashes: 4,
+		},
+	} {
+		if err := s.snapGetByteCodes(t, &tc); err != nil {
+			t.Errorf("test %d \n bytes: %d\n #hashes: %d\nfailed: %v", i, tc.nBytes, len(tc.hashes), err)
+		}
+	}
+}
+
+type trieNodesTest struct {
+	root   common.Hash
+	paths  []snap.TrieNodePathSet
+	nBytes uint64
+
+	expHashes []common.Hash
+	expReject bool
+}
+
+func decodeNibbles(nibbles []byte, bytes []byte) {
+	for bi, ni := 0, 0; ni < len(nibbles); bi, ni = bi+1, ni+2 {
+		bytes[bi] = nibbles[ni]<<4 | nibbles[ni+1]
+	}
+}
+
+// hasTerm returns whether a hex key has the terminator flag.
+func hasTerm(s []byte) bool {
+	return len(s) > 0 && s[len(s)-1] == 16
+}
+
+func keybytesToHex(str []byte) []byte {
+	l := len(str)*2 + 1
+	var nibbles = make([]byte, l)
+	for i, b := range str {
+		nibbles[i*2] = b / 16
+		nibbles[i*2+1] = b % 16
+	}
+	nibbles[l-1] = 16
+	return nibbles
+}
+
+func hexToCompact(hex []byte) []byte {
+	terminator := byte(0)
+	if hasTerm(hex) {
+		terminator = 1
+		hex = hex[:len(hex)-1]
+	}
+	buf := make([]byte, len(hex)/2+1)
+	buf[0] = terminator << 5 // the flag byte
+	if len(hex)&1 == 1 {
+		buf[0] |= 1 << 4 // odd flag
+		buf[0] |= hex[0] // first nibble is contained in the first byte
+		hex = hex[1:]
+	}
+	decodeNibbles(hex, buf[1:])
+	return buf
+}
+
+// TestSnapTrieNodes various forms of GetTrieNodes requests.
+func (s *Suite) TestSnapTrieNodes(t *utesting.T) {
+
+	key := common.FromHex("0x00bf49f440a1cd0527e4d06e2765654c0f56452257516d793a9b8d604dcfdf2a")
+	// helper function to iterate the key, and generate the compact-encoded
+	// trie paths along the way.
+	pathTo := func(length int) snap.TrieNodePathSet {
+		hex := keybytesToHex(key)[:length]
+		hex[len(hex)-1] = 0 // remove term flag
+		hKey := hexToCompact(hex)
+		return snap.TrieNodePathSet{hKey}
+	}
+	var accPaths []snap.TrieNodePathSet
+	for i := 1; i <= 65; i++ {
+		accPaths = append(accPaths, pathTo(i))
+	}
+	empty := emptyCode
+	for i, tc := range []trieNodesTest{
+		{
+			root:      s.chain.RootAt(999),
+			paths:     nil,
+			nBytes:    500,
+			expHashes: nil,
+		},
+		{
+			root: s.chain.RootAt(999),
+			paths: []snap.TrieNodePathSet{
+				{}, // zero-length pathset should 'abort' and kick us off
+				{[]byte{0}},
+			},
+			nBytes:    5000,
+			expHashes: []common.Hash{},
+			expReject: true,
+		},
+		{
+			root: s.chain.RootAt(999),
+			paths: []snap.TrieNodePathSet{
+				{[]byte{0}},
+				{[]byte{1}, []byte{0}},
+			},
+			nBytes: 5000,
+			//0x6b3724a41b8c38b46d4d02fba2bb2074c47a507eb16a9a4b978f91d32e406faf
+			expHashes: []common.Hash{s.chain.RootAt(999)},
+		},
+		{ // nonsensically long path
+			root: s.chain.RootAt(999),
+			paths: []snap.TrieNodePathSet{
+				{[]byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 0, 1, 2, 3, 4, 5, 6, 7, 8, 0, 1, 2, 3, 4, 5, 6, 7, 8,
+					0, 1, 2, 3, 4, 5, 6, 7, 8, 0, 1, 2, 3, 4, 5, 6, 7, 8, 0, 1, 2, 3, 4, 5, 6, 7, 8}},
+			},
+			nBytes:    5000,
+			expHashes: []common.Hash{common.HexToHash("0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470")},
+		},
+		{
+			root: s.chain.RootAt(0),
+			paths: []snap.TrieNodePathSet{
+				{[]byte{0}},
+				{[]byte{1}, []byte{0}},
+			},
+			nBytes:    5000,
+			expHashes: []common.Hash{},
+		},
+		{
+			// The leaf is only a couple of levels down, so the continued trie traversal causes lookup failures.
+			root:   s.chain.RootAt(999),
+			paths:  accPaths,
+			nBytes: 5000,
+			expHashes: []common.Hash{
+				common.HexToHash("0xbcefee69b37cca1f5bf3a48aebe08b35f2ea1864fa958bb0723d909a0e0d28d8"),
+				common.HexToHash("0x4fb1e4e2391e4b4da471d59641319b8fa25d76c973d4bec594d7b00a69ae5135"),
+				empty, empty, empty, empty, empty, empty, empty, empty, empty, empty, empty, empty,
+				empty, empty, empty, empty, empty, empty, empty, empty, empty, empty, empty, empty,
+				empty, empty, empty, empty, empty, empty, empty, empty, empty, empty, empty, empty,
+				empty, empty, empty, empty, empty, empty, empty, empty, empty, empty, empty, empty,
+				empty, empty, empty, empty, empty, empty, empty, empty, empty, empty, empty, empty,
+				empty, empty, empty},
+		},
+		{
+			// Basically the same as above, with different ordering
+			root: s.chain.RootAt(999),
+			paths: []snap.TrieNodePathSet{
+				accPaths[10], accPaths[1], accPaths[0],
+			},
+			nBytes: 5000,
+			expHashes: []common.Hash{
+				empty,
+				common.HexToHash("0x4fb1e4e2391e4b4da471d59641319b8fa25d76c973d4bec594d7b00a69ae5135"),
+				common.HexToHash("0xbcefee69b37cca1f5bf3a48aebe08b35f2ea1864fa958bb0723d909a0e0d28d8"),
+			},
+		},
+	} {
+		if err := s.snapGetTrieNodes(t, &tc); err != nil {
+			t.Errorf("test %d \n #hashes %x\n root: %#x\n bytes: %d\nfailed: %v", i, len(tc.expHashes), tc.root, tc.nBytes, err)
+		}
+	}
+}
+
+func (s *Suite) snapGetAccountRange(t *utesting.T, tc *accRangeTest) error {
+	conn, err := s.dialSnap()
+	if err != nil {
+		t.Fatalf("dial failed: %v", err)
+	}
+	defer conn.Close()
+	if err = conn.peer(s.chain, nil); err != nil {
+		t.Fatalf("peering failed: %v", err)
+	}
+	// write request
+	req := &GetAccountRange{
+		ID:     uint64(rand.Int63()),
+		Root:   tc.root,
+		Origin: tc.origin,
+		Limit:  tc.limit,
+		Bytes:  tc.nBytes,
+	}
+	resp, err := conn.snapRequest(req, req.ID, s.chain)
+	if err != nil {
+		return fmt.Errorf("account range request failed: %v", err)
+	}
+	var res *snap.AccountRangePacket
+	if r, ok := resp.(*AccountRange); !ok {
+		return fmt.Errorf("account range response wrong: %T %v", resp, resp)
+	} else {
+		res = (*snap.AccountRangePacket)(r)
+	}
+	if exp, got := tc.expAccounts, len(res.Accounts); exp != got {
+		return fmt.Errorf("expected %d accounts, got %d", exp, got)
+	}
+	// Check that the encoding order is correct
+	for i := 1; i < len(res.Accounts); i++ {
+		if bytes.Compare(res.Accounts[i-1].Hash[:], res.Accounts[i].Hash[:]) >= 0 {
+			return fmt.Errorf("accounts not monotonically increasing: #%d [%x] vs #%d [%x]", i-1, res.Accounts[i-1].Hash[:], i, res.Accounts[i].Hash[:])
+		}
+	}
+	var (
+		hashes   []common.Hash
+		accounts [][]byte
+		proof    = res.Proof
+	)
+	hashes, accounts, err = res.Unpack()
+	if err != nil {
+		return err
+	}
+	if len(hashes) == 0 && len(accounts) == 0 && len(proof) == 0 {
+		return nil
+	}
+	if len(hashes) > 0 {
+		if exp, got := tc.expFirst, res.Accounts[0].Hash; exp != got {
+			return fmt.Errorf("expected first account 0x%x, got 0x%x", exp, got)
+		}
+		if exp, got := tc.expLast, res.Accounts[len(res.Accounts)-1].Hash; exp != got {
+			return fmt.Errorf("expected last account 0x%x, got 0x%x", exp, got)
+		}
+	}
+	// Reconstruct a partial trie from the response and verify it
+	keys := make([][]byte, len(hashes))
+	for i, key := range hashes {
+		keys[i] = common.CopyBytes(key[:])
+	}
+	nodes := make(light.NodeList, len(proof))
+	for i, node := range proof {
+		nodes[i] = node
+	}
+	proofdb := nodes.NodeSet()
+
+	var end []byte
+	if len(keys) > 0 {
+		end = keys[len(keys)-1]
+	}
+	_, err = trie.VerifyRangeProof(tc.root, tc.origin[:], end, keys, accounts, proofdb)
+	return err
+}
+
+func (s *Suite) snapGetStorageRanges(t *utesting.T, tc *stRangesTest) error {
+	conn, err := s.dialSnap()
+	if err != nil {
+		t.Fatalf("dial failed: %v", err)
+	}
+	defer conn.Close()
+	if err = conn.peer(s.chain, nil); err != nil {
+		t.Fatalf("peering failed: %v", err)
+	}
+	// write request
+	req := &GetStorageRanges{
+		ID:       uint64(rand.Int63()),
+		Root:     tc.root,
+		Accounts: tc.accounts,
+		Origin:   tc.origin,
+		Limit:    tc.limit,
+		Bytes:    tc.nBytes,
+	}
+	resp, err := conn.snapRequest(req, req.ID, s.chain)
+	if err != nil {
+		return fmt.Errorf("account range request failed: %v", err)
+	}
+	var res *snap.StorageRangesPacket
+	if r, ok := resp.(*StorageRanges); !ok {
+		return fmt.Errorf("account range response wrong: %T %v", resp, resp)
+	} else {
+		res = (*snap.StorageRangesPacket)(r)
+	}
+	gotSlots := 0
+	// Ensure the ranges are monotonically increasing
+	for i, slots := range res.Slots {
+		gotSlots += len(slots)
+		for j := 1; j < len(slots); j++ {
+			if bytes.Compare(slots[j-1].Hash[:], slots[j].Hash[:]) >= 0 {
+				return fmt.Errorf("storage slots not monotonically increasing for account #%d: #%d [%x] vs #%d [%x]", i, j-1, slots[j-1].Hash[:], j, slots[j].Hash[:])
+			}
+		}
+	}
+	if exp, got := tc.expSlots, gotSlots; exp != got {
+		return fmt.Errorf("expected %d slots, got %d", exp, got)
+	}
+	return nil
+}
+
+func (s *Suite) snapGetByteCodes(t *utesting.T, tc *byteCodesTest) error {
+	conn, err := s.dialSnap()
+	if err != nil {
+		t.Fatalf("dial failed: %v", err)
+	}
+	defer conn.Close()
+	if err = conn.peer(s.chain, nil); err != nil {
+		t.Fatalf("peering failed: %v", err)
+	}
+	// write request
+	req := &GetByteCodes{
+		ID:     uint64(rand.Int63()),
+		Hashes: tc.hashes,
+		Bytes:  tc.nBytes,
+	}
+	resp, err := conn.snapRequest(req, req.ID, s.chain)
+	if err != nil {
+		return fmt.Errorf("getBytecodes request failed: %v", err)
+	}
+	var res *snap.ByteCodesPacket
+	if r, ok := resp.(*ByteCodes); !ok {
+		return fmt.Errorf("bytecodes response wrong: %T %v", resp, resp)
+	} else {
+		res = (*snap.ByteCodesPacket)(r)
+	}
+	if exp, got := tc.expHashes, len(res.Codes); exp != got {
+		for i, c := range res.Codes {
+			fmt.Printf("%d. %#x\n", i, c)
+		}
+		return fmt.Errorf("expected %d bytecodes, got %d", exp, got)
+	}
+	// Cross reference the requested bytecodes with the response to find gaps
+	// that the serving node is missing
+	var (
+		bytecodes = res.Codes
+		hasher    = sha3.NewLegacyKeccak256().(crypto.KeccakState)
+		hash      = make([]byte, 32)
+		codes     = make([][]byte, len(req.Hashes))
+	)
+
+	for i, j := 0, 0; i < len(bytecodes); i++ {
+		// Find the next hash that we've been served, leaving misses with nils
+		hasher.Reset()
+		hasher.Write(bytecodes[i])
+		hasher.Read(hash)
+
+		for j < len(req.Hashes) && !bytes.Equal(hash, req.Hashes[j][:]) {
+			j++
+		}
+		if j < len(req.Hashes) {
+			codes[j] = bytecodes[i]
+			j++
+			continue
+		}
+		// We've either ran out of hashes, or got unrequested data
+		return errors.New("unexpected bytecode")
+	}
+
+	return nil
+}
+
+func (s *Suite) snapGetTrieNodes(t *utesting.T, tc *trieNodesTest) error {
+	conn, err := s.dialSnap()
+	if err != nil {
+		t.Fatalf("dial failed: %v", err)
+	}
+	defer conn.Close()
+	if err = conn.peer(s.chain, nil); err != nil {
+		t.Fatalf("peering failed: %v", err)
+	}
+	// write request
+	req := &GetTrieNodes{
+		ID:    uint64(rand.Int63()),
+		Root:  tc.root,
+		Paths: tc.paths,
+		Bytes: tc.nBytes,
+	}
+	resp, err := conn.snapRequest(req, req.ID, s.chain)
+	if err != nil {
+		if tc.expReject {
+			return nil
+		}
+		return fmt.Errorf("trienodes  request failed: %v", err)
+	}
+	var res *snap.TrieNodesPacket
+	if r, ok := resp.(*TrieNodes); !ok {
+		return fmt.Errorf("trienodes response wrong: %T %v", resp, resp)
+	} else {
+		res = (*snap.TrieNodesPacket)(r)
+	}
+
+	// Check the correctness
+
+	// Cross reference the requested trienodes with the response to find gaps
+	// that the serving node is missing
+	hasher := sha3.NewLegacyKeccak256().(crypto.KeccakState)
+	hash := make([]byte, 32)
+	trienodes := res.Nodes
+	if got, want := len(trienodes), len(tc.expHashes); got != want {
+		return fmt.Errorf("wrong trienode count, got %d, want %d\n", got, want)
+	}
+	for i, trienode := range trienodes {
+		hasher.Reset()
+		hasher.Write(trienode)
+		hasher.Read(hash)
+		if got, want := hash, tc.expHashes[i]; !bytes.Equal(got, want[:]) {
+			fmt.Printf("hash %d wrong, got %#x, want %#x\n", i, got, want)
+			err = fmt.Errorf("hash %d wrong, got %#x, want %#x", i, got, want)
+		}
+	}
+	return err
+}
--- a/cmd/devp2p/internal/ethtest/snapTypes.go
+++ b/cmd/devp2p/internal/ethtest/snapTypes.go
@@ -0,0 +1,36 @@
+package ethtest
+
+import "github.com/ethereum/go-ethereum/eth/protocols/snap"
+
+// GetAccountRange represents an account range query.
+type GetAccountRange snap.GetAccountRangePacket
+
+func (g GetAccountRange) Code() int { return 33 }
+
+type AccountRange snap.AccountRangePacket
+
+func (g AccountRange) Code() int { return 34 }
+
+type GetStorageRanges snap.GetStorageRangesPacket
+
+func (g GetStorageRanges) Code() int { return 35 }
+
+type StorageRanges snap.StorageRangesPacket
+
+func (g StorageRanges) Code() int { return 36 }
+
+type GetByteCodes snap.GetByteCodesPacket
+
+func (g GetByteCodes) Code() int { return 37 }
+
+type ByteCodes snap.ByteCodesPacket
+
+func (g ByteCodes) Code() int { return 38 }
+
+type GetTrieNodes snap.GetTrieNodesPacket
+
+func (g GetTrieNodes) Code() int { return 39 }
+
+type TrieNodes snap.TrieNodesPacket
+
+func (g TrieNodes) Code() int { return 40 }
--- a/cmd/devp2p/internal/ethtest/suite.go
+++ b/cmd/devp2p/internal/ethtest/suite.go
--- a/cmd/devp2p/internal/ethtest/suite_test.go
+++ b/cmd/devp2p/internal/ethtest/suite_test.go
@@ -45,7 +45,28 @@ func TestEthSuite(t *testing.T) {
 	if err != nil {
 		t.Fatalf("could not create new test suite: %v", err)
 	}
-	for _, test := range suite.AllEthTests() {
+	for _, test := range suite.Eth66Tests() {
+		t.Run(test.Name, func(t *testing.T) {
+			result := utesting.RunTAP([]utesting.Test{{Name: test.Name, Fn: test.Fn}}, os.Stdout)
+			if result[0].Failed {
+				t.Fatal()
+			}
+		})
+	}
+}
+
+func TestSnapSuite(t *testing.T) {
+	geth, err := runGeth()
+	if err != nil {
+		t.Fatalf("could not run geth: %v", err)
+	}
+	defer geth.Close()
+
+	suite, err := NewSuite(geth.Server().Self(), fullchainFile, genesisFile)
+	if err != nil {
+		t.Fatalf("could not create new test suite: %v", err)
+	}
+	for _, test := range suite.SnapTests() {
 		t.Run(test.Name, func(t *testing.T) {
 			result := utesting.RunTAP([]utesting.Test{{Name: test.Name, Fn: test.Fn}}, os.Stdout)
 			if result[0].Failed {
--- a/cmd/devp2p/internal/ethtest/transaction.go
+++ b/cmd/devp2p/internal/ethtest/transaction.go
@@ -17,6 +17,7 @@
 package ethtest

 import (
+	"fmt"
 	"math/big"
 	"strings"
 	"time"
@@ -31,58 +32,171 @@ import (
 //var faucetAddr = common.HexToAddress("0x71562b71999873DB5b286dF957af199Ec94617F7")
 var faucetKey, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")

-func sendSuccessfulTx(t *utesting.T, s *Suite, tx *types.Transaction) {
-	sendConn := s.setupConnection(t)
-	defer sendConn.Close()
-	sendSuccessfulTxWithConn(t, s, tx, sendConn)
+func (s *Suite) sendSuccessfulTxs(t *utesting.T, isEth66 bool) error {
+	tests := []*types.Transaction{
+		getNextTxFromChain(s),
+		unknownTx(s),
+	}
+	for i, tx := range tests {
+		if tx == nil {
+			return fmt.Errorf("could not find tx to send")
+		}
+		t.Logf("Testing tx propagation %d: sending tx %v %v %v\n", i, tx.Hash().String(), tx.GasPrice(), tx.Gas())
+		// get previous tx if exists for reference in case of old tx propagation
+		var prevTx *types.Transaction
+		if i != 0 {
+			prevTx = tests[i-1]
+		}
+		// write tx to connection
+		if err := sendSuccessfulTx(s, tx, prevTx, isEth66); err != nil {
+			return fmt.Errorf("send successful tx test failed: %v", err)
+		}
+	}
+	return nil
 }

-func sendSuccessfulTxWithConn(t *utesting.T, s *Suite, tx *types.Transaction, sendConn *Conn) {
-	t.Logf("sending tx: %v %v %v\n", tx.Hash().String(), tx.GasPrice(), tx.Gas())
+func sendSuccessfulTx(s *Suite, tx *types.Transaction, prevTx *types.Transaction, isEth66 bool) error {
+	sendConn, recvConn, err := s.createSendAndRecvConns(isEth66)
+	if err != nil {
+		return err
+	}
+	defer sendConn.Close()
+	defer recvConn.Close()
+	if err = sendConn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
+	}
 	// Send the transaction
-	if err := sendConn.Write(&Transactions{tx}); err != nil {
-		t.Fatal(err)
+	if err = sendConn.Write(&Transactions{tx}); err != nil {
+		return fmt.Errorf("failed to write to connection: %v", err)
+	}
+	// peer receiving connection to node
+	if err = recvConn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
 	}
 	// update last nonce seen
 	nonce = tx.Nonce()
-
-	recvConn := s.setupConnection(t)
 	// Wait for the transaction announcement
-	switch msg := recvConn.ReadAndServe(s.chain, timeout).(type) {
-	case *Transactions:
-		recTxs := *msg
-		for _, gotTx := range recTxs {
-			if gotTx.Hash() == tx.Hash() {
-				// Ok
-				return
+	for {
+		switch msg := recvConn.readAndServe(s.chain, timeout).(type) {
+		case *Transactions:
+			recTxs := *msg
+			// if you receive an old tx propagation, read from connection again
+			if len(recTxs) == 1 && prevTx != nil {
+				if recTxs[0] == prevTx {
+					continue
+				}
 			}
-		}
-		t.Fatalf("missing transaction: got %v missing %v", recTxs, tx.Hash())
-	case *NewPooledTransactionHashes:
-		txHashes := *msg
-		for _, gotHash := range txHashes {
-			if gotHash == tx.Hash() {
-				return
+			for _, gotTx := range recTxs {
+				if gotTx.Hash() == tx.Hash() {
+					// Ok
+					return nil
+				}
 			}
+			return fmt.Errorf("missing transaction: got %v missing %v", recTxs, tx.Hash())
+		case *NewPooledTransactionHashes:
+			txHashes := *msg
+			// if you receive an old tx propagation, read from connection again
+			if len(txHashes) == 1 && prevTx != nil {
+				if txHashes[0] == prevTx.Hash() {
+					continue
+				}
+			}
+			for _, gotHash := range txHashes {
+				if gotHash == tx.Hash() {
+					// Ok
+					return nil
+				}
+			}
+			return fmt.Errorf("missing transaction announcement: got %v missing %v", txHashes, tx.Hash())
+		default:
+			return fmt.Errorf("unexpected message in sendSuccessfulTx: %s", pretty.Sdump(msg))
 		}
-		t.Fatalf("missing transaction announcement: got %v missing %v", txHashes, tx.Hash())
-	default:
-		t.Fatalf("unexpected message in sendSuccessfulTx: %s", pretty.Sdump(msg))
 	}
 }

+func (s *Suite) sendMaliciousTxs(t *utesting.T, isEth66 bool) error {
+	badTxs := []*types.Transaction{
+		getOldTxFromChain(s),
+		invalidNonceTx(s),
+		hugeAmount(s),
+		hugeGasPrice(s),
+		hugeData(s),
+	}
+	// setup receiving connection before sending malicious txs
+	var (
+		recvConn *Conn
+		err      error
+	)
+	if isEth66 {
+		recvConn, err = s.dial66()
+	} else {
+		recvConn, err = s.dial()
+	}
+	if err != nil {
+		return fmt.Errorf("dial failed: %v", err)
+	}
+	defer recvConn.Close()
+	if err = recvConn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
+	}
+	for i, tx := range badTxs {
+		t.Logf("Testing malicious tx propagation: %v\n", i)
+		if err = sendMaliciousTx(s, tx, isEth66); err != nil {
+			return fmt.Errorf("malicious tx test failed:\ntx: %v\nerror: %v", tx, err)
+		}
+	}
+	// check to make sure bad txs aren't propagated
+	return checkMaliciousTxPropagation(s, badTxs, recvConn)
+}
+
+func sendMaliciousTx(s *Suite, tx *types.Transaction, isEth66 bool) error {
+	// setup connection
+	var (
+		conn *Conn
+		err  error
+	)
+	if isEth66 {
+		conn, err = s.dial66()
+	} else {
+		conn, err = s.dial()
+	}
+	if err != nil {
+		return fmt.Errorf("dial failed: %v", err)
+	}
+	defer conn.Close()
+	if err = conn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
+	}
+	// write malicious tx
+	if err = conn.Write(&Transactions{tx}); err != nil {
+		return fmt.Errorf("failed to write to connection: %v", err)
+	}
+	return nil
+}
+
 var nonce = uint64(99)

-func sendMultipleSuccessfulTxs(t *utesting.T, s *Suite, sendConn *Conn, txs []*types.Transaction) {
+// sendMultipleSuccessfulTxs sends the given transactions to the node and
+// expects the node to accept and propagate them.
+func sendMultipleSuccessfulTxs(t *utesting.T, s *Suite, txs []*types.Transaction) error {
 	txMsg := Transactions(txs)
 	t.Logf("sending %d txs\n", len(txs))

-	recvConn := s.setupConnection(t)
+	sendConn, recvConn, err := s.createSendAndRecvConns(true)
+	if err != nil {
+		return err
+	}
+	defer sendConn.Close()
 	defer recvConn.Close()
-
+	if err = sendConn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
+	}
+	if err = recvConn.peer(s.chain, nil); err != nil {
+		return fmt.Errorf("peering failed: %v", err)
+	}
 	// Send the transactions
-	if err := sendConn.Write(&txMsg); err != nil {
-		t.Fatal(err)
+	if err = sendConn.Write(&txMsg); err != nil {
+		return fmt.Errorf("failed to write message to connection: %v", err)
 	}
 	// update nonce
 	nonce = txs[len(txs)-1].Nonce()
@@ -90,7 +204,7 @@ func sendMultipleSuccessfulTxs(t *utesting.T, s *Suite, sendConn *Conn, txs []*t
 	recvHashes := make([]common.Hash, 0)
 	// all txs should be announced within 3 announcements
 	for i := 0; i < 3; i++ {
-		switch msg := recvConn.ReadAndServe(s.chain, timeout).(type) {
+		switch msg := recvConn.readAndServe(s.chain, timeout).(type) {
 		case *Transactions:
 			for _, tx := range *msg {
 				recvHashes = append(recvHashes, tx.Hash())
@@ -99,7 +213,7 @@ func sendMultipleSuccessfulTxs(t *utesting.T, s *Suite, sendConn *Conn, txs []*t
 			recvHashes = append(recvHashes, *msg...)
 		default:
 			if !strings.Contains(pretty.Sdump(msg), "i/o timeout") {
-				t.Fatalf("unexpected message while waiting to receive txs: %s", pretty.Sdump(msg))
+				return fmt.Errorf("unexpected message while waiting to receive txs: %s", pretty.Sdump(msg))
 			}
 		}
 		// break once all 2000 txs have been received
@@ -112,7 +226,7 @@ func sendMultipleSuccessfulTxs(t *utesting.T, s *Suite, sendConn *Conn, txs []*t
 				continue
 			} else {
 				t.Logf("successfully received all %d txs", len(txs))
-				return
+				return nil
 			}
 		}
 	}
@@ -121,13 +235,15 @@ func sendMultipleSuccessfulTxs(t *utesting.T, s *Suite, sendConn *Conn, txs []*t
 		for _, missing := range missingTxs {
 			t.Logf("missing tx: %v", missing.Hash())
 		}
-		t.Fatalf("missing %d txs", len(missingTxs))
+		return fmt.Errorf("missing %d txs", len(missingTxs))
 	}
+	return nil
 }

-func waitForTxPropagation(t *utesting.T, s *Suite, txs []*types.Transaction, recvConn *Conn) {
-	// Wait for another transaction announcement
-	switch msg := recvConn.ReadAndServe(s.chain, time.Second*8).(type) {
+// checkMaliciousTxPropagation checks whether the given malicious transactions were
+// propagated by the node.
+func checkMaliciousTxPropagation(s *Suite, txs []*types.Transaction, conn *Conn) error {
+	switch msg := conn.readAndServe(s.chain, time.Second*8).(type) {
 	case *Transactions:
 		// check to see if any of the failing txs were in the announcement
 		recvTxs := make([]common.Hash, len(*msg))
@@ -136,25 +252,20 @@ func waitForTxPropagation(t *utesting.T, s *Suite, txs []*types.Transaction, rec
 		}
 		badTxs, _ := compareReceivedTxs(recvTxs, txs)
 		if len(badTxs) > 0 {
-			for _, tx := range badTxs {
-				t.Logf("received bad tx: %v", tx)
-			}
-			t.Fatalf("received %d bad txs", len(badTxs))
+			return fmt.Errorf("received %d bad txs: \n%v", len(badTxs), badTxs)
 		}
 	case *NewPooledTransactionHashes:
 		badTxs, _ := compareReceivedTxs(*msg, txs)
 		if len(badTxs) > 0 {
-			for _, tx := range badTxs {
-				t.Logf("received bad tx: %v", tx)
-			}
-			t.Fatalf("received %d bad txs", len(badTxs))
+			return fmt.Errorf("received %d bad txs: \n%v", len(badTxs), badTxs)
 		}
 	case *Error:
 		// Transaction should not be announced -> wait for timeout
-		return
+		return nil
 	default:
-		t.Fatalf("unexpected message in sendFailingTx: %s", pretty.Sdump(msg))
+		return fmt.Errorf("unexpected message in sendFailingTx: %s", pretty.Sdump(msg))
 	}
+	return nil
 }

 // compareReceivedTxs compares the received set of txs against the given set of txs,
@@ -180,118 +291,129 @@ func compareReceivedTxs(recvTxs []common.Hash, txs []*types.Transaction) (presen
 	return present, missing
 }

-func unknownTx(t *utesting.T, s *Suite) *types.Transaction {
-	tx := getNextTxFromChain(t, s)
+func unknownTx(s *Suite) *types.Transaction {
+	tx := getNextTxFromChain(s)
+	if tx == nil {
+		return nil
+	}
 	var to common.Address
 	if tx.To() != nil {
 		to = *tx.To()
 	}
 	txNew := types.NewTransaction(tx.Nonce()+1, to, tx.Value(), tx.Gas(), tx.GasPrice(), tx.Data())
-	return signWithFaucet(t, s.chain.chainConfig, txNew)
+	return signWithFaucet(s.chain.chainConfig, txNew)
 }

-func getNextTxFromChain(t *utesting.T, s *Suite) *types.Transaction {
+func getNextTxFromChain(s *Suite) *types.Transaction {
 	// Get a new transaction
-	var tx *types.Transaction
 	for _, blocks := range s.fullChain.blocks[s.chain.Len():] {
 		txs := blocks.Transactions()
 		if txs.Len() != 0 {
-			tx = txs[0]
-			break
+			return txs[0]
 		}
 	}
-	if tx == nil {
-		t.Fatal("could not find transaction")
-	}
-	return tx
+	return nil
 }

-func generateTxs(t *utesting.T, s *Suite, numTxs int) (map[common.Hash]common.Hash, []*types.Transaction) {
+func generateTxs(s *Suite, numTxs int) (map[common.Hash]common.Hash, []*types.Transaction, error) {
 	txHashMap := make(map[common.Hash]common.Hash, numTxs)
 	txs := make([]*types.Transaction, numTxs)

-	nextTx := getNextTxFromChain(t, s)
+	nextTx := getNextTxFromChain(s)
+	if nextTx == nil {
+		return nil, nil, fmt.Errorf("failed to get the next transaction")
+	}
 	gas := nextTx.Gas()

 	nonce = nonce + 1
 	// generate txs
 	for i := 0; i < numTxs; i++ {
-		tx := generateTx(t, s.chain.chainConfig, nonce, gas)
+		tx := generateTx(s.chain.chainConfig, nonce, gas)
+		if tx == nil {
+			return nil, nil, fmt.Errorf("failed to get the next transaction")
+		}
 		txHashMap[tx.Hash()] = tx.Hash()
 		txs[i] = tx
 		nonce = nonce + 1
 	}
-	return txHashMap, txs
+	return txHashMap, txs, nil
 }

-func generateTx(t *utesting.T, chainConfig *params.ChainConfig, nonce uint64, gas uint64) *types.Transaction {
+func generateTx(chainConfig *params.ChainConfig, nonce uint64, gas uint64) *types.Transaction {
 	var to common.Address
 	tx := types.NewTransaction(nonce, to, big.NewInt(1), gas, big.NewInt(1), []byte{})
-	return signWithFaucet(t, chainConfig, tx)
+	return signWithFaucet(chainConfig, tx)
 }

-func getOldTxFromChain(t *utesting.T, s *Suite) *types.Transaction {
-	var tx *types.Transaction
+func getOldTxFromChain(s *Suite) *types.Transaction {
 	for _, blocks := range s.fullChain.blocks[:s.chain.Len()-1] {
 		txs := blocks.Transactions()
 		if txs.Len() != 0 {
-			tx = txs[0]
-			break
+			return txs[0]
 		}
 	}
-	if tx == nil {
-		t.Fatal("could not find transaction")
-	}
-	return tx
+	return nil
 }

-func invalidNonceTx(t *utesting.T, s *Suite) *types.Transaction {
-	tx := getNextTxFromChain(t, s)
+func invalidNonceTx(s *Suite) *types.Transaction {
+	tx := getNextTxFromChain(s)
+	if tx == nil {
+		return nil
+	}
 	var to common.Address
 	if tx.To() != nil {
 		to = *tx.To()
 	}
 	txNew := types.NewTransaction(tx.Nonce()-2, to, tx.Value(), tx.Gas(), tx.GasPrice(), tx.Data())
-	return signWithFaucet(t, s.chain.chainConfig, txNew)
+	return signWithFaucet(s.chain.chainConfig, txNew)
 }

-func hugeAmount(t *utesting.T, s *Suite) *types.Transaction {
-	tx := getNextTxFromChain(t, s)
+func hugeAmount(s *Suite) *types.Transaction {
+	tx := getNextTxFromChain(s)
+	if tx == nil {
+		return nil
+	}
 	amount := largeNumber(2)
 	var to common.Address
 	if tx.To() != nil {
 		to = *tx.To()
 	}
 	txNew := types.NewTransaction(tx.Nonce(), to, amount, tx.Gas(), tx.GasPrice(), tx.Data())
-	return signWithFaucet(t, s.chain.chainConfig, txNew)
+	return signWithFaucet(s.chain.chainConfig, txNew)
 }

-func hugeGasPrice(t *utesting.T, s *Suite) *types.Transaction {
-	tx := getNextTxFromChain(t, s)
+func hugeGasPrice(s *Suite) *types.Transaction {
+	tx := getNextTxFromChain(s)
+	if tx == nil {
+		return nil
+	}
 	gasPrice := largeNumber(2)
 	var to common.Address
 	if tx.To() != nil {
 		to = *tx.To()
 	}
 	txNew := types.NewTransaction(tx.Nonce(), to, tx.Value(), tx.Gas(), gasPrice, tx.Data())
-	return signWithFaucet(t, s.chain.chainConfig, txNew)
+	return signWithFaucet(s.chain.chainConfig, txNew)
 }

-func hugeData(t *utesting.T, s *Suite) *types.Transaction {
-	tx := getNextTxFromChain(t, s)
+func hugeData(s *Suite) *types.Transaction {
+	tx := getNextTxFromChain(s)
+	if tx == nil {
+		return nil
+	}
 	var to common.Address
 	if tx.To() != nil {
 		to = *tx.To()
 	}
 	txNew := types.NewTransaction(tx.Nonce(), to, tx.Value(), tx.Gas(), tx.GasPrice(), largeBuffer(2))
-	return signWithFaucet(t, s.chain.chainConfig, txNew)
+	return signWithFaucet(s.chain.chainConfig, txNew)
 }

-func signWithFaucet(t *utesting.T, chainConfig *params.ChainConfig, tx *types.Transaction) *types.Transaction {
+func signWithFaucet(chainConfig *params.ChainConfig, tx *types.Transaction) *types.Transaction {
 	signer := types.LatestSigner(chainConfig)
 	signedTx, err := types.SignTx(tx, signer, faucetKey)
 	if err != nil {
-		t.Fatalf("could not sign tx: %v\n", err)
+		return nil
 	}
 	return signedTx
 }
--- a/cmd/devp2p/internal/ethtest/types.go
+++ b/cmd/devp2p/internal/ethtest/types.go
@@ -19,13 +19,9 @@ package ethtest
 import (
 	"crypto/ecdsa"
 	"fmt"
-	"reflect"
 	"time"

-	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/eth/protocols/eth"
-	"github.com/ethereum/go-ethereum/internal/utesting"
 	"github.com/ethereum/go-ethereum/p2p"
 	"github.com/ethereum/go-ethereum/p2p/rlpx"
 	"github.com/ethereum/go-ethereum/rlp"
@@ -131,12 +127,15 @@ func (pt PooledTransactions) Code() int { return 26 }
 // Conn represents an individual connection with a peer
 type Conn struct {
 	*rlpx.Conn
-	ourKey                 *ecdsa.PrivateKey
-	negotiatedProtoVersion uint
-	ourHighestProtoVersion uint
-	caps                   []p2p.Cap
+	ourKey                     *ecdsa.PrivateKey
+	negotiatedProtoVersion     uint
+	negotiatedSnapProtoVersion uint
+	ourHighestProtoVersion     uint
+	ourHighestSnapProtoVersion uint
+	caps                       []p2p.Cap
 }

+// Read reads an eth packet from the connection.
 func (c *Conn) Read() Message {
 	code, rawData, _, err := c.Conn.Read()
 	if err != nil {
@@ -185,39 +184,85 @@ func (c *Conn) Read() Message {
 	return msg
 }

-// ReadAndServe serves GetBlockHeaders requests while waiting
-// on another message from the node.
-func (c *Conn) ReadAndServe(chain *Chain, timeout time.Duration) Message {
-	start := time.Now()
-	for time.Since(start) < timeout {
-		c.SetReadDeadline(time.Now().Add(5 * time.Second))
-		switch msg := c.Read().(type) {
-		case *Ping:
-			c.Write(&Pong{})
-		case *GetBlockHeaders:
-			req := *msg
-			headers, err := chain.GetHeaders(req)
-			if err != nil {
-				return errorf("could not get headers for inbound header request: %v", err)
-			}
-
-			if err := c.Write(headers); err != nil {
-				return errorf("could not write to connection: %v", err)
-			}
-		default:
-			return msg
-		}
+// Read66 reads an eth66 packet from the connection.
+func (c *Conn) Read66() (uint64, Message) {
+	code, rawData, _, err := c.Conn.Read()
+	if err != nil {
+		return 0, errorf("could not read from connection: %v", err)
 	}
-	return errorf("no message received within %v", timeout)
+
+	var msg Message
+	switch int(code) {
+	case (Hello{}).Code():
+		msg = new(Hello)
+	case (Ping{}).Code():
+		msg = new(Ping)
+	case (Pong{}).Code():
+		msg = new(Pong)
+	case (Disconnect{}).Code():
+		msg = new(Disconnect)
+	case (Status{}).Code():
+		msg = new(Status)
+	case (GetBlockHeaders{}).Code():
+		ethMsg := new(eth.GetBlockHeadersPacket66)
+		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
+			return 0, errorf("could not rlp decode message: %v", err)
+		}
+		return ethMsg.RequestId, GetBlockHeaders(*ethMsg.GetBlockHeadersPacket)
+	case (BlockHeaders{}).Code():
+		ethMsg := new(eth.BlockHeadersPacket66)
+		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
+			return 0, errorf("could not rlp decode message: %v", err)
+		}
+		return ethMsg.RequestId, BlockHeaders(ethMsg.BlockHeadersPacket)
+	case (GetBlockBodies{}).Code():
+		ethMsg := new(eth.GetBlockBodiesPacket66)
+		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
+			return 0, errorf("could not rlp decode message: %v", err)
+		}
+		return ethMsg.RequestId, GetBlockBodies(ethMsg.GetBlockBodiesPacket)
+	case (BlockBodies{}).Code():
+		ethMsg := new(eth.BlockBodiesPacket66)
+		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
+			return 0, errorf("could not rlp decode message: %v", err)
+		}
+		return ethMsg.RequestId, BlockBodies(ethMsg.BlockBodiesPacket)
+	case (NewBlock{}).Code():
+		msg = new(NewBlock)
+	case (NewBlockHashes{}).Code():
+		msg = new(NewBlockHashes)
+	case (Transactions{}).Code():
+		msg = new(Transactions)
+	case (NewPooledTransactionHashes{}).Code():
+		msg = new(NewPooledTransactionHashes)
+	case (GetPooledTransactions{}.Code()):
+		ethMsg := new(eth.GetPooledTransactionsPacket66)
+		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
+			return 0, errorf("could not rlp decode message: %v", err)
+		}
+		return ethMsg.RequestId, GetPooledTransactions(ethMsg.GetPooledTransactionsPacket)
+	case (PooledTransactions{}.Code()):
+		ethMsg := new(eth.PooledTransactionsPacket66)
+		if err := rlp.DecodeBytes(rawData, ethMsg); err != nil {
+			return 0, errorf("could not rlp decode message: %v", err)
+		}
+		return ethMsg.RequestId, PooledTransactions(ethMsg.PooledTransactionsPacket)
+	default:
+		msg = errorf("invalid message code: %d", code)
+	}
+
+	if msg != nil {
+		if err := rlp.DecodeBytes(rawData, msg); err != nil {
+			return 0, errorf("could not rlp decode message: %v", err)
+		}
+		return 0, msg
+	}
+	return 0, errorf("invalid message: %s", string(rawData))
 }

+// Write writes a eth packet to the connection.
 func (c *Conn) Write(msg Message) error {
-	// check if message is eth protocol message
-	var (
-		payload []byte
-		err     error
-	)
-	payload, err = rlp.EncodeToBytes(msg)
+	payload, err := rlp.EncodeToBytes(msg)
 	if err != nil {
 		return err
 	}
@@ -225,135 +270,52 @@ func (c *Conn) Write(msg Message) error {
 	return err
 }

-// handshake checks to make sure a `HELLO` is received.
-func (c *Conn) handshake(t *utesting.T) Message {
-	defer c.SetDeadline(time.Time{})
-	c.SetDeadline(time.Now().Add(10 * time.Second))
-
-	// write hello to client
-	pub0 := crypto.FromECDSAPub(&c.ourKey.PublicKey)[1:]
-	ourHandshake := &Hello{
-		Version: 5,
-		Caps:    c.caps,
-		ID:      pub0,
-	}
-	if err := c.Write(ourHandshake); err != nil {
-		t.Fatalf("could not write to connection: %v", err)
-	}
-	// read hello from client
-	switch msg := c.Read().(type) {
-	case *Hello:
-		// set snappy if version is at least 5
-		if msg.Version >= 5 {
-			c.SetSnappy(true)
-		}
-		c.negotiateEthProtocol(msg.Caps)
-		if c.negotiatedProtoVersion == 0 {
-			t.Fatalf("unexpected eth protocol version")
-		}
-		return msg
-	default:
-		t.Fatalf("bad handshake: %#v", msg)
-		return nil
+// Write66 writes an eth66 packet to the connection.
+func (c *Conn) Write66(req eth.Packet, code int) error {
+	payload, err := rlp.EncodeToBytes(req)
+	if err != nil {
+		return err
 	}
+	_, err = c.Conn.Write(uint64(code), payload)
+	return err
 }

-// negotiateEthProtocol sets the Conn's eth protocol version
-// to highest advertised capability from peer
-func (c *Conn) negotiateEthProtocol(caps []p2p.Cap) {
-	var highestEthVersion uint
-	for _, capability := range caps {
-		if capability.Name != "eth" {
+// ReadSnap reads a snap/1 response with the given id from the connection.
+func (c *Conn) ReadSnap(id uint64) (Message, error) {
+	respId := id + 1
+	start := time.Now()
+	for respId != id && time.Since(start) < timeout {
+		code, rawData, _, err := c.Conn.Read()
+		if err != nil {
+			return nil, fmt.Errorf("could not read from connection: %v", err)
+		}
+		var snpMsg interface{}
+		switch int(code) {
+		case (GetAccountRange{}).Code():
+			snpMsg = new(GetAccountRange)
+		case (AccountRange{}).Code():
+			snpMsg = new(AccountRange)
+		case (GetStorageRanges{}).Code():
+			snpMsg = new(GetStorageRanges)
+		case (StorageRanges{}).Code():
+			snpMsg = new(StorageRanges)
+		case (GetByteCodes{}).Code():
+			snpMsg = new(GetByteCodes)
+		case (ByteCodes{}).Code():
+			snpMsg = new(ByteCodes)
+		case (GetTrieNodes{}).Code():
+			snpMsg = new(GetTrieNodes)
+		case (TrieNodes{}).Code():
+			snpMsg = new(TrieNodes)
+		default:
+			//return nil, fmt.Errorf("invalid message code: %d", code)
 			continue
 		}
-		if capability.Version > highestEthVersion && capability.Version <= c.ourHighestProtoVersion {
-			highestEthVersion = capability.Version
-		}
-	}
-	c.negotiatedProtoVersion = highestEthVersion
-}
-
-// statusExchange performs a `Status` message exchange with the given
-// node.
-func (c *Conn) statusExchange(t *utesting.T, chain *Chain, status *Status) Message {
-	defer c.SetDeadline(time.Time{})
-	c.SetDeadline(time.Now().Add(20 * time.Second))
-
-	// read status message from client
-	var message Message
-loop:
-	for {
-		switch msg := c.Read().(type) {
-		case *Status:
-			if have, want := msg.Head, chain.blocks[chain.Len()-1].Hash(); have != want {
-				t.Fatalf("wrong head block in status, want:  %#x (block %d) have %#x",
-					want, chain.blocks[chain.Len()-1].NumberU64(), have)
-			}
-			if have, want := msg.TD.Cmp(chain.TD(chain.Len())), 0; have != want {
-				t.Fatalf("wrong TD in status: have %v want %v", have, want)
-			}
-			if have, want := msg.ForkID, chain.ForkID(); !reflect.DeepEqual(have, want) {
-				t.Fatalf("wrong fork ID in status: have %v, want %v", have, want)
-			}
-			message = msg
-			break loop
-		case *Disconnect:
-			t.Fatalf("disconnect received: %v", msg.Reason)
-		case *Ping:
-			c.Write(&Pong{}) // TODO (renaynay): in the future, this should be an error
-			// (PINGs should not be a response upon fresh connection)
-		default:
-			t.Fatalf("bad status message: %s", pretty.Sdump(msg))
-		}
-	}
-	// make sure eth protocol version is set for negotiation
-	if c.negotiatedProtoVersion == 0 {
-		t.Fatalf("eth protocol version must be set in Conn")
-	}
-	if status == nil {
-		// write status message to client
-		status = &Status{
-			ProtocolVersion: uint32(c.negotiatedProtoVersion),
-			NetworkID:       chain.chainConfig.ChainID.Uint64(),
-			TD:              chain.TD(chain.Len()),
-			Head:            chain.blocks[chain.Len()-1].Hash(),
-			Genesis:         chain.blocks[0].Hash(),
-			ForkID:          chain.ForkID(),
-		}
-	}
-
-	if err := c.Write(status); err != nil {
-		t.Fatalf("could not write to connection: %v", err)
-	}
-
-	return message
-}
-
-// waitForBlock waits for confirmation from the client that it has
-// imported the given block.
-func (c *Conn) waitForBlock(block *types.Block) error {
-	defer c.SetReadDeadline(time.Time{})
-
-	c.SetReadDeadline(time.Now().Add(20 * time.Second))
-	// note: if the node has not yet imported the block, it will respond
-	// to the GetBlockHeaders request with an empty BlockHeaders response,
-	// so the GetBlockHeaders request must be sent again until the BlockHeaders
-	// response contains the desired header.
-	for {
-		req := &GetBlockHeaders{Origin: eth.HashOrNumber{Hash: block.Hash()}, Amount: 1}
-		if err := c.Write(req); err != nil {
-			return err
-		}
-		switch msg := c.Read().(type) {
-		case *BlockHeaders:
-			for _, header := range *msg {
-				if header.Number.Uint64() == block.NumberU64() {
-					return nil
-				}
-			}
-			time.Sleep(100 * time.Millisecond)
-		default:
-			return fmt.Errorf("invalid message: %s", pretty.Sdump(msg))
+		if err := rlp.DecodeBytes(rawData, snpMsg); err != nil {
+			return nil, fmt.Errorf("could not rlp decode message: %v", err)
 		}
+		return snpMsg.(Message), nil
+
 	}
+	return nil, fmt.Errorf("request timed out")
 }
--- a/cmd/devp2p/internal/v4test/discv4tests.go
+++ b/cmd/devp2p/internal/v4test/discv4tests.go
@@ -21,7 +21,6 @@ import (
 	"crypto/rand"
 	"fmt"
 	"net"
-	"reflect"
 	"time"

 	"github.com/ethereum/go-ethereum/crypto"
@@ -80,25 +79,57 @@ func BasicPing(t *utesting.T) {
 		To:         te.remoteEndpoint(),
 		Expiration: futureExpiration(),
 	})
-
-	reply, _, _ := te.read(te.l1)
-	if err := te.checkPong(reply, pingHash); err != nil {
+	if err := te.checkPingPong(pingHash); err != nil {
 		t.Fatal(err)
 	}
 }

-// checkPong verifies that reply is a valid PONG matching the given ping hash.
+// checkPingPong verifies that the remote side sends both a PONG with the
+// correct hash, and a PING.
+// The two packets do not have to be in any particular order.
+func (te *testenv) checkPingPong(pingHash []byte) error {
+	var (
+		pings int
+		pongs int
+	)
+	for i := 0; i < 2; i++ {
+		reply, _, err := te.read(te.l1)
+		if err != nil {
+			return err
+		}
+		switch reply.Kind() {
+		case v4wire.PongPacket:
+			if err := te.checkPong(reply, pingHash); err != nil {
+				return err
+			}
+			pongs++
+		case v4wire.PingPacket:
+			pings++
+		default:
+			return fmt.Errorf("expected PING or PONG, got %v %v", reply.Name(), reply)
+		}
+	}
+	if pongs == 1 && pings == 1 {
+		return nil
+	}
+	return fmt.Errorf("expected 1 PING  (got %d) and 1 PONG (got %d)", pings, pongs)
+}
+
+// checkPong verifies that reply is a valid PONG matching the given ping hash,
+// and a PING. The two packets do not have to be in any particular order.
 func (te *testenv) checkPong(reply v4wire.Packet, pingHash []byte) error {
-	if reply == nil || reply.Kind() != v4wire.PongPacket {
-		return fmt.Errorf("expected PONG reply, got %v", reply)
+	if reply == nil {
+		return fmt.Errorf("expected PONG reply, got nil")
+	}
+	if reply.Kind() != v4wire.PongPacket {
+		return fmt.Errorf("expected PONG reply, got %v %v", reply.Name(), reply)
 	}
 	pong := reply.(*v4wire.Pong)
 	if !bytes.Equal(pong.ReplyTok, pingHash) {
 		return fmt.Errorf("PONG reply token mismatch: got %x, want %x", pong.ReplyTok, pingHash)
 	}
-	wantEndpoint := te.localEndpoint(te.l1)
-	if !reflect.DeepEqual(pong.To, wantEndpoint) {
-		return fmt.Errorf("PONG 'to' endpoint mismatch: got %+v, want %+v", pong.To, wantEndpoint)
+	if want := te.localEndpoint(te.l1); !want.IP.Equal(pong.To.IP) || want.UDP != pong.To.UDP {
+		return fmt.Errorf("PONG 'to' endpoint mismatch: got %+v, want %+v", pong.To, want)
 	}
 	if v4wire.Expired(pong.Expiration) {
 		return fmt.Errorf("PONG is expired (%v)", pong.Expiration)
@@ -118,9 +149,7 @@ func PingWrongTo(t *utesting.T) {
 		To:         wrongEndpoint,
 		Expiration: futureExpiration(),
 	})
-
-	reply, _, _ := te.read(te.l1)
-	if err := te.checkPong(reply, pingHash); err != nil {
+	if err := te.checkPingPong(pingHash); err != nil {
 		t.Fatal(err)
 	}
 }
@@ -138,8 +167,7 @@ func PingWrongFrom(t *utesting.T) {
 		Expiration: futureExpiration(),
 	})

-	reply, _, _ := te.read(te.l1)
-	if err := te.checkPong(reply, pingHash); err != nil {
+	if err := te.checkPingPong(pingHash); err != nil {
 		t.Fatal(err)
 	}
 }
@@ -160,8 +188,7 @@ func PingExtraData(t *utesting.T) {
 		JunkData2:  []byte{9, 8, 7, 6, 5, 4, 3, 2, 1},
 	})

-	reply, _, _ := te.read(te.l1)
-	if err := te.checkPong(reply, pingHash); err != nil {
+	if err := te.checkPingPong(pingHash); err != nil {
 		t.Fatal(err)
 	}
 }
@@ -182,8 +209,7 @@ func PingExtraDataWrongFrom(t *utesting.T) {
 		JunkData2:  []byte{9, 8, 7, 6, 5, 4, 3, 2, 1},
 	}
 	pingHash := te.send(te.l1, &req)
-	reply, _, _ := te.read(te.l1)
-	if err := te.checkPong(reply, pingHash); err != nil {
+	if err := te.checkPingPong(pingHash); err != nil {
 		t.Fatal(err)
 	}
 }
@@ -203,7 +229,7 @@ func PingPastExpiration(t *utesting.T) {

 	reply, _, _ := te.read(te.l1)
 	if reply != nil {
-		t.Fatal("Expected no reply, got", reply)
+		t.Fatalf("Expected no reply, got %v %v", reply.Name(), reply)
 	}
 }

@@ -221,7 +247,7 @@ func WrongPacketType(t *utesting.T) {

 	reply, _, _ := te.read(te.l1)
 	if reply != nil {
-		t.Fatal("Expected no reply, got", reply)
+		t.Fatalf("Expected no reply, got %v %v", reply.Name(), reply)
 	}
 }

@@ -239,9 +265,9 @@ func BondThenPingWithWrongFrom(t *utesting.T) {
 		To:         te.remoteEndpoint(),
 		Expiration: futureExpiration(),
 	})
-
-	reply, _, _ := te.read(te.l1)
-	if err := te.checkPong(reply, pingHash); err != nil {
+	if reply, _, err := te.read(te.l1); err != nil {
+		t.Fatal(err)
+	} else if err := te.checkPong(reply, pingHash); err != nil {
 		t.Fatal(err)
 	}
 }
@@ -256,9 +282,16 @@ func FindnodeWithoutEndpointProof(t *utesting.T) {
 	rand.Read(req.Target[:])
 	te.send(te.l1, &req)

-	reply, _, _ := te.read(te.l1)
-	if reply != nil {
-		t.Fatal("Expected no response, got", reply)
+	for {
+		reply, _, _ := te.read(te.l1)
+		if reply == nil {
+			// No response, all good
+			break
+		}
+		if reply.Kind() == v4wire.PingPacket {
+			continue // A ping is ok, just ignore it
+		}
+		t.Fatalf("Expected no reply, got %v %v", reply.Name(), reply)
 	}
 }

@@ -278,7 +311,7 @@ func BasicFindnode(t *utesting.T) {
 		t.Fatal("read find nodes", err)
 	}
 	if reply.Kind() != v4wire.NeighborsPacket {
-		t.Fatal("Expected neighbors, got", reply.Name())
+		t.Fatalf("Expected neighbors, got %v %v", reply.Name(), reply)
 	}
 }

@@ -315,7 +348,7 @@ func UnsolicitedNeighbors(t *utesting.T) {
 		t.Fatal("read find nodes", err)
 	}
 	if reply.Kind() != v4wire.NeighborsPacket {
-		t.Fatal("Expected neighbors, got", reply.Name())
+		t.Fatalf("Expected neighbors, got %v %v", reply.Name(), reply)
 	}
 	nodes := reply.(*v4wire.Neighbors).Nodes
 	if contains(nodes, encFakeKey) {
--- a/cmd/devp2p/nodeset.go
+++ b/cmd/devp2p/nodeset.go
@@ -20,7 +20,6 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"sort"
 	"time"
@@ -66,7 +65,7 @@ func writeNodesJSON(file string, nodes nodeSet) {
 		os.Stdout.Write(nodesJSON)
 		return
 	}
-	if err := ioutil.WriteFile(file, nodesJSON, 0644); err != nil {
+	if err := os.WriteFile(file, nodesJSON, 0644); err != nil {
 		exit(err)
 	}
 }
--- a/cmd/devp2p/nodesetcmd.go
+++ b/cmd/devp2p/nodesetcmd.go
@@ -235,6 +235,8 @@ func ethFilter(args []string) (nodeFilter, error) {
 		filter = forkid.NewStaticFilter(params.GoerliChainConfig, params.GoerliGenesisHash)
 	case "ropsten":
 		filter = forkid.NewStaticFilter(params.RopstenChainConfig, params.RopstenGenesisHash)
+	case "sepolia":
+		filter = forkid.NewStaticFilter(params.SepoliaChainConfig, params.SepoliaGenesisHash)
 	default:
 		return nil, fmt.Errorf("unknown network %q", args[0])
 	}
--- a/cmd/devp2p/rlpxcmd.go
+++ b/cmd/devp2p/rlpxcmd.go
@@ -36,6 +36,7 @@ var (
 		Subcommands: []cli.Command{
 			rlpxPingCommand,
 			rlpxEthTestCommand,
+			rlpxSnapTestCommand,
 		},
 	}
 	rlpxPingCommand = cli.Command{
@@ -53,6 +54,16 @@ var (
 			testTAPFlag,
 		},
 	}
+	rlpxSnapTestCommand = cli.Command{
+		Name:      "snap-test",
+		Usage:     "Runs tests against a node",
+		ArgsUsage: "<node> <chain.rlp> <genesis.json>",
+		Action:    rlpxSnapTest,
+		Flags: []cli.Flag{
+			testPatternFlag,
+			testTAPFlag,
+		},
+	}
 )

 func rlpxPing(ctx *cli.Context) error {
@@ -106,3 +117,15 @@ func rlpxEthTest(ctx *cli.Context) error {
 	}
 	return runTests(ctx, suite.AllEthTests())
 }
+
+// rlpxSnapTest runs the snap protocol test suite.
+func rlpxSnapTest(ctx *cli.Context) error {
+	if ctx.NArg() < 3 {
+		exit("missing path to chain.rlp as command-line argument")
+	}
+	suite, err := ethtest.NewSuite(getNodeArg(ctx), ctx.Args()[1], ctx.Args()[2])
+	if err != nil {
+		exit(err)
+	}
+	return runTests(ctx, suite.SnapTests())
+}
--- a/cmd/ethkey/changepassword.go
+++ b/cmd/ethkey/changepassword.go
@@ -18,7 +18,7 @@ package main

 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"

 	"github.com/ethereum/go-ethereum/accounts/keystore"
@@ -45,7 +45,7 @@ Change the password of a keyfile.`,
 		keyfilepath := ctx.Args().First()

 		// Read key from file.
-		keyjson, err := ioutil.ReadFile(keyfilepath)
+		keyjson, err := os.ReadFile(keyfilepath)
 		if err != nil {
 			utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
 		}
@@ -61,7 +61,7 @@ Change the password of a keyfile.`,
 		fmt.Println("Please provide a new password")
 		var newPhrase string
 		if passFile := ctx.String(newPassphraseFlag.Name); passFile != "" {
-			content, err := ioutil.ReadFile(passFile)
+			content, err := os.ReadFile(passFile)
 			if err != nil {
 				utils.Fatalf("Failed to read new password file '%s': %v", passFile, err)
 			}
@@ -77,7 +77,7 @@ Change the password of a keyfile.`,
 		}

 		// Then write the new keyfile in place of the old one.
-		if err := ioutil.WriteFile(keyfilepath, newJson, 0600); err != nil {
+		if err := os.WriteFile(keyfilepath, newJson, 0600); err != nil {
 			utils.Fatalf("Error writing new keyfile to disk: %v", err)
 		}

--- a/cmd/ethkey/generate.go
+++ b/cmd/ethkey/generate.go
@@ -19,7 +19,6 @@ package main
 import (
 	"crypto/ecdsa"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"

@@ -35,6 +34,17 @@ type outputGenerate struct {
 	AddressEIP55 string
 }

+var (
+	privateKeyFlag = cli.StringFlag{
+		Name:  "privatekey",
+		Usage: "file containing a raw private key to encrypt",
+	}
+	lightKDFFlag = cli.BoolFlag{
+		Name:  "lightkdf",
+		Usage: "use less secure scrypt parameters",
+	}
+)
+
 var commandGenerate = cli.Command{
 	Name:      "generate",
 	Usage:     "generate new keyfile",
@@ -48,14 +58,8 @@ If you want to encrypt an existing private key, it can be specified by setting
 	Flags: []cli.Flag{
 		passphraseFlag,
 		jsonFlag,
-		cli.StringFlag{
-			Name:  "privatekey",
-			Usage: "file containing a raw private key to encrypt",
-		},
-		cli.BoolFlag{
-			Name:  "lightkdf",
-			Usage: "use less secure scrypt parameters",
-		},
+		privateKeyFlag,
+		lightKDFFlag,
 	},
 	Action: func(ctx *cli.Context) error {
 		// Check if keyfile path given and make sure it doesn't already exist.
@@ -71,7 +75,7 @@ If you want to encrypt an existing private key, it can be specified by setting

 		var privateKey *ecdsa.PrivateKey
 		var err error
-		if file := ctx.String("privatekey"); file != "" {
+		if file := ctx.String(privateKeyFlag.Name); file != "" {
 			// Load private key from file.
 			privateKey, err = crypto.LoadECDSA(file)
 			if err != nil {
@@ -99,7 +103,7 @@ If you want to encrypt an existing private key, it can be specified by setting
 		// Encrypt key with passphrase.
 		passphrase := getPassphrase(ctx, true)
 		scryptN, scryptP := keystore.StandardScryptN, keystore.StandardScryptP
-		if ctx.Bool("lightkdf") {
+		if ctx.Bool(lightKDFFlag.Name) {
 			scryptN, scryptP = keystore.LightScryptN, keystore.LightScryptP
 		}
 		keyjson, err := keystore.EncryptKey(key, passphrase, scryptN, scryptP)
@@ -111,7 +115,7 @@ If you want to encrypt an existing private key, it can be specified by setting
 		if err := os.MkdirAll(filepath.Dir(keyfilepath), 0700); err != nil {
 			utils.Fatalf("Could not create directory %s", filepath.Dir(keyfilepath))
 		}
-		if err := ioutil.WriteFile(keyfilepath, keyjson, 0600); err != nil {
+		if err := os.WriteFile(keyfilepath, keyjson, 0600); err != nil {
 			utils.Fatalf("Failed to write keyfile to %s: %v", keyfilepath, err)
 		}

--- a/cmd/ethkey/inspect.go
+++ b/cmd/ethkey/inspect.go
@@ -19,7 +19,7 @@ package main
 import (
 	"encoding/hex"
 	"fmt"
-	"io/ioutil"
+	"os"

 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/cmd/utils"
@@ -33,6 +33,13 @@ type outputInspect struct {
 	PrivateKey string
 }

+var (
+	privateFlag = cli.BoolFlag{
+		Name:  "private",
+		Usage: "include the private key in the output",
+	}
+)
+
 var commandInspect = cli.Command{
 	Name:      "inspect",
 	Usage:     "inspect a keyfile",
@@ -45,16 +52,13 @@ make sure to use this feature with great caution!`,
 	Flags: []cli.Flag{
 		passphraseFlag,
 		jsonFlag,
-		cli.BoolFlag{
-			Name:  "private",
-			Usage: "include the private key in the output",
-		},
+		privateFlag,
 	},
 	Action: func(ctx *cli.Context) error {
 		keyfilepath := ctx.Args().First()

 		// Read key from file.
-		keyjson, err := ioutil.ReadFile(keyfilepath)
+		keyjson, err := os.ReadFile(keyfilepath)
 		if err != nil {
 			utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
 		}
@@ -67,7 +71,7 @@ make sure to use this feature with great caution!`,
 		}

 		// Output all relevant information we can retrieve.
-		showPrivate := ctx.Bool("private")
+		showPrivate := ctx.Bool(privateFlag.Name)
 		out := outputInspect{
 			Address: key.Address.Hex(),
 			PublicKey: hex.EncodeToString(
--- a/cmd/ethkey/message.go
+++ b/cmd/ethkey/message.go
@@ -19,7 +19,7 @@ package main
 import (
 	"encoding/hex"
 	"fmt"
-	"io/ioutil"
+	"os"

 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/cmd/utils"
@@ -56,7 +56,7 @@ To sign a message contained in a file, use the --msgfile flag.

 		// Load the keyfile.
 		keyfilepath := ctx.Args().First()
-		keyjson, err := ioutil.ReadFile(keyfilepath)
+		keyjson, err := os.ReadFile(keyfilepath)
 		if err != nil {
 			utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
 		}
@@ -142,11 +142,11 @@ It is possible to refer to a file containing the message.`,
 }

 func getMessage(ctx *cli.Context, msgarg int) []byte {
-	if file := ctx.String("msgfile"); file != "" {
+	if file := ctx.String(msgfileFlag.Name); file != "" {
 		if len(ctx.Args()) > msgarg {
 			utils.Fatalf("Can't use --msgfile and message argument at the same time.")
 		}
-		msg, err := ioutil.ReadFile(file)
+		msg, err := os.ReadFile(file)
 		if err != nil {
 			utils.Fatalf("Can't read message file: %v", err)
 		}
--- a/cmd/ethkey/message_test.go
+++ b/cmd/ethkey/message_test.go
@@ -17,18 +17,12 @@
 package main

 import (
-	"io/ioutil"
-	"os"
 	"path/filepath"
 	"testing"
 )

 func TestMessageSignVerify(t *testing.T) {
-	tmpdir, err := ioutil.TempDir("", "ethkey-test")
-	if err != nil {
-		t.Fatal("Can't create temporary directory:", err)
-	}
-	defer os.RemoveAll(tmpdir)
+	tmpdir := t.TempDir()

 	keyfile := filepath.Join(tmpdir, "the-keyfile")
 	message := "test message"
--- a/cmd/ethkey/utils.go
+++ b/cmd/ethkey/utils.go
@@ -19,7 +19,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"

 	"github.com/ethereum/go-ethereum/cmd/utils"
@@ -34,7 +34,7 @@ func getPassphrase(ctx *cli.Context, confirmation bool) string {
 	// Look for the --passwordfile flag.
 	passphraseFile := ctx.String(passphraseFlag.Name)
 	if passphraseFile != "" {
-		content, err := ioutil.ReadFile(passphraseFile)
+		content, err := os.ReadFile(passphraseFile)
 		if err != nil {
 			utils.Fatalf("Failed to read password file '%s': %v",
 				passphraseFile, err)
@@ -49,7 +49,7 @@ func getPassphrase(ctx *cli.Context, confirmation bool) string {
 // signHash is a helper function that calculates a hash for the given message
 // that can be safely used to calculate a signature from.
 //
-// The hash is calulcated as
+// The hash is calculated as
 //   keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
 //
 // This gives context to the signed message and prevents signing of transactions.
--- a/cmd/evm/README.md
+++ b/cmd/evm/README.md
@@ -4,15 +4,15 @@ The `evm t8n` tool is a stateless state transition utility. It is a utility
 which can

 1. Take a prestate, including
-  - Accounts,
-  - Block context information,
-  - Previous blockshashes (*optional)
+- Accounts,
+- Block context information,
+- Previous blockshashes (*optional)
 2. Apply a set of transactions,
 3. Apply a mining-reward (*optional),
 4. And generate a post-state, including
-  - State root, transaction root, receipt root,
-  - Information about rejected transactions,
-  - Optionally: a full or partial post-state dump
+- State root, transaction root, receipt root,
+- Information about rejected transactions,
+- Optionally: a full or partial post-state dump

 ## Specification

@@ -37,6 +37,8 @@ Command line params that has to be supported are
   --output.result result             Determines where to put the result (stateroot, txroot etc) of the post-state.
                                      `stdout` - into the stdout output
                                      `stderr` - into the stderr output
+   --output.body value                If set, the RLP of the transactions (block body) will be written to this file.
+   --input.txs stdin                  stdin or file name of where to find the transactions to apply. If the file prefix is '.rlp', then the data is interpreted as an RLP list of signed transactions.The '.rlp' format is identical to the output.body format. (default: "txs.json")
   --state.fork value                 Name of ruleset to use.
   --state.chainid value              ChainID to use (default: 1)
   --state.reward value               Mining reward. Set to -1 to disable (default: 0)
@@ -110,7 +112,10 @@ Two resulting files:
  }
 ],
 "rejected": [
-  1
+  {
+   "index": 1,
+   "error": "nonce too low: address 0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192, tx: 0 state: 1"
+  }
 ]
 }
 ```
@@ -156,7 +161,10 @@ Output:
   }
  ],
  "rejected": [
-   1
+   {
+    "index": 1,
+    "error": "nonce too low: address 0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192, tx: 0 state: 1"
+   }
  ]
 }
 }
@@ -168,9 +176,9 @@ Mining rewards and ommer rewards might need to be added. This is how those are a

 - `block_reward` is the block mining reward for the miner (`0xaa`), of a block at height `N`.
 - For each ommer (mined by `0xbb`), with blocknumber `N-delta`
-   - (where `delta` is the difference between the current block and the ommer)
-   - The account `0xbb` (ommer miner) is awarded `(8-delta)/ 8 * block_reward`
-   - The account `0xaa` (block miner) is awarded `block_reward / 32`
+  - (where `delta` is the difference between the current block and the ommer)
+  - The account `0xbb` (ommer miner) is awarded `(8-delta)/ 8 * block_reward`
+  - The account `0xaa` (block miner) is awarded `block_reward / 32`

 To make `state_t8n` apply these, the following inputs are required:

@@ -200,7 +208,7 @@ Example:
  ]
 }
 ```
-When applying this, using a reward of `0x08`
+When applying this, using a reward of `0x80`
 Output:
 ```json
 {
@@ -220,7 +228,7 @@ Output:
 ### Future EIPS

 It is also possible to experiment with future eips that are not yet defined in a hard fork.
-Example, putting EIP-1344 into Frontier: 
+Example, putting EIP-1344 into Frontier:
 ```
 ./evm t8n --state.fork=Frontier+1344 --input.pre=./testdata/1/pre.json --input.txs=./testdata/1/txs.json --input.env=/testdata/1/env.json
 ```
@@ -229,41 +237,102 @@ Example, putting EIP-1344 into Frontier:

 The `BLOCKHASH` opcode requires blockhashes to be provided by the caller, inside the `env`.
 If a required blockhash is not provided, the exit code should be `4`:
-Example where blockhashes are provided: 
+Example where blockhashes are provided:
 ```
-./evm t8n --input.alloc=./testdata/3/alloc.json --input.txs=./testdata/3/txs.json --input.env=./testdata/3/env.json --trace
+./evm --verbosity=1 t8n --input.alloc=./testdata/3/alloc.json --input.txs=./testdata/3/txs.json --input.env=./testdata/3/env.json  --trace
+INFO [07-27|11:53:40.960] Trie dumping started                     root=b7341d..857ea1
+INFO [07-27|11:53:40.960] Trie dumping complete                    accounts=3 elapsed="103.298µs"
+INFO [07-27|11:53:40.960] Wrote file                               file=alloc.json
+INFO [07-27|11:53:40.960] Wrote file                               file=result.json
+
 ```
+
 ```
 cat trace-0-0x72fadbef39cd251a437eea619cfeda752271a5faaaa2147df012e112159ffb81.jsonl | grep BLOCKHASH -C2
 ```
 ```
-{"pc":0,"op":96,"gas":"0x5f58ef8","gasCost":"0x3","memory":"0x","memSize":0,"stack":[],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"PUSH1","error":""}
-{"pc":2,"op":64,"gas":"0x5f58ef5","gasCost":"0x14","memory":"0x","memSize":0,"stack":["0x1"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"BLOCKHASH","error":""}
-{"pc":3,"op":0,"gas":"0x5f58ee1","gasCost":"0x0","memory":"0x","memSize":0,"stack":["0xdac58aa524e50956d0c0bae7f3f8bb9d35381365d07804dd5b48a5a297c06af4"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"STOP","error":""}
-{"output":"","gasUsed":"0x17","time":142709}
+{"pc":0,"op":96,"gas":"0x5f58ef8","gasCost":"0x3","memory":"0x","memSize":0,"stack":[],"returnData":"0x","depth":1,"refund":0,"opName":"PUSH1","error":""}
+{"pc":2,"op":64,"gas":"0x5f58ef5","gasCost":"0x14","memory":"0x","memSize":0,"stack":["0x1"],"returnData":"0x","depth":1,"refund":0,"opName":"BLOCKHASH","error":""}
+{"pc":3,"op":0,"gas":"0x5f58ee1","gasCost":"0x0","memory":"0x","memSize":0,"stack":["0xdac58aa524e50956d0c0bae7f3f8bb9d35381365d07804dd5b48a5a297c06af4"],"returnData":"0x","depth":1,"refund":0,"opName":"STOP","error":""}
+{"output":"","gasUsed":"0x17","time":156276}
 ```

 In this example, the caller has not provided the required blockhash:
 ```
 ./evm t8n --input.alloc=./testdata/4/alloc.json --input.txs=./testdata/4/txs.json --input.env=./testdata/4/env.json --trace
-```
-```
 ERROR(4): getHash(3) invoked, blockhash for that block not provided
 ```
 Error code: 4
+
 ### Chaining

 Another thing that can be done, is to chain invocations:
 ```
 ./evm t8n --input.alloc=./testdata/1/alloc.json --input.txs=./testdata/1/txs.json --input.env=./testdata/1/env.json --output.alloc=stdout | ./evm t8n --input.alloc=stdin --input.env=./testdata/1/env.json --input.txs=./testdata/1/txs.json
-INFO [01-21|22:41:22.963] rejected tx                              index=1 hash=0557ba..18d673 from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low: address 0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192, tx: 0 state: 1"
-INFO [01-21|22:41:22.966] rejected tx                              index=0 hash=0557ba..18d673 from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low: address 0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192, tx: 0 state: 1"
-INFO [01-21|22:41:22.967] rejected tx                              index=1 hash=0557ba..18d673 from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low: address 0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192, tx: 0 state: 1"
+INFO [07-27|11:53:41.049] rejected tx                              index=1 hash=0557ba..18d673 from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low: address 0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192, tx: 0 state: 1"
+INFO [07-27|11:53:41.050] Trie dumping started                     root=84208a..ae4e13
+INFO [07-27|11:53:41.050] Trie dumping complete                    accounts=3 elapsed="59.412µs"
+INFO [07-27|11:53:41.050] Wrote file                               file=result.json
+INFO [07-27|11:53:41.051] rejected tx                              index=0 hash=0557ba..18d673 from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low: address 0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192, tx: 0 state: 1"
+INFO [07-27|11:53:41.051] rejected tx                              index=1 hash=0557ba..18d673 from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low: address 0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192, tx: 0 state: 1"
+INFO [07-27|11:53:41.052] Trie dumping started                     root=84208a..ae4e13
+INFO [07-27|11:53:41.052] Trie dumping complete                    accounts=3 elapsed="45.734µs"
+INFO [07-27|11:53:41.052] Wrote file                               file=alloc.json
+INFO [07-27|11:53:41.052] Wrote file                               file=result.json

 ```
-What happened here, is that we first applied two identical transactions, so the second one was rejected. 
+What happened here, is that we first applied two identical transactions, so the second one was rejected.
 Then, taking the poststate alloc as the input for the next state, we tried again to include
 the same two transactions: this time, both failed due to too low nonce.

 In order to meaningfully chain invocations, one would need to provide meaningful new `env`, otherwise the
 actual blocknumber (exposed to the EVM) would not increase.
+
+### Transactions in RLP form
+
+It is possible to provide already-signed transactions as input to, using an `input.txs` which ends with the `rlp` suffix.
+The input format for RLP-form transactions is _identical_ to the _output_ format for block bodies. Therefore, it's fully possible
+to use the evm to go from `json` input to `rlp` input.
+
+The following command takes **json** the transactions in `./testdata/13/txs.json` and signs them. After execution, they are output to `signed_txs.rlp`.:
+```
+./evm t8n --state.fork=London --input.alloc=./testdata/13/alloc.json --input.txs=./testdata/13/txs.json --input.env=./testdata/13/env.json --output.result=alloc_jsontx.json --output.body=signed_txs.rlp
+INFO [07-27|11:53:41.124] Trie dumping started                     root=e4b924..6aef61
+INFO [07-27|11:53:41.124] Trie dumping complete                    accounts=3 elapsed="94.284µs"
+INFO [07-27|11:53:41.125] Wrote file                               file=alloc.json
+INFO [07-27|11:53:41.125] Wrote file                               file=alloc_jsontx.json
+INFO [07-27|11:53:41.125] Wrote file                               file=signed_txs.rlp
+
+```
+
+The `output.body` is the rlp-list of transactions, encoded in hex and placed in a string a'la `json` encoding rules:
+```
+cat signed_txs.rlp
+"0xf8d2b86702f864010180820fa08284d09411111111111111111111111111111111111111118080c001a0b7dfab36232379bb3d1497a4f91c1966b1f932eae3ade107bf5d723b9cb474e0a06261c359a10f2132f126d250485b90cf20f30340801244a08ef6142ab33d1904b86702f864010280820fa08284d09411111111111111111111111111111111111111118080c080a0d4ec563b6568cd42d998fc4134b36933c6568d01533b5adf08769270243c6c7fa072bf7c21eac6bbeae5143371eef26d5e279637f3bd73482b55979d76d935b1e9"
+```
+
+We can use `rlpdump` to check what the contents are:
+```
+rlpdump -hex $(cat signed_txs.rlp | jq -r )
+[
+  02f864010180820fa08284d09411111111111111111111111111111111111111118080c001a0b7dfab36232379bb3d1497a4f91c1966b1f932eae3ade107bf5d723b9cb474e0a06261c359a10f2132f126d250485b90cf20f30340801244a08ef6142ab33d1904,
+  02f864010280820fa08284d09411111111111111111111111111111111111111118080c080a0d4ec563b6568cd42d998fc4134b36933c6568d01533b5adf08769270243c6c7fa072bf7c21eac6bbeae5143371eef26d5e279637f3bd73482b55979d76d935b1e9,
+]
+```
+Now, we can now use those (or any other already signed transactions), as input, like so:
+```
+./evm t8n --state.fork=London --input.alloc=./testdata/13/alloc.json --input.txs=./signed_txs.rlp --input.env=./testdata/13/env.json --output.result=alloc_rlptx.json
+INFO [07-27|11:53:41.253] Trie dumping started                     root=e4b924..6aef61
+INFO [07-27|11:53:41.253] Trie dumping complete                    accounts=3 elapsed="128.445µs"
+INFO [07-27|11:53:41.253] Wrote file                               file=alloc.json
+INFO [07-27|11:53:41.255] Wrote file                               file=alloc_rlptx.json
+
+```
+
+You might have noticed that the results from these two invocations were stored in two separate files.
+And we can now finally check that they match.
+```
+cat alloc_jsontx.json | jq .stateRoot && cat alloc_rlptx.json | jq .stateRoot
+"0xe4b924a6adb5959fccf769d5b7bb2f6359e26d1e76a2443c5a91a36d826aef61"
+"0xe4b924a6adb5959fccf769d5b7bb2f6359e26d1e76a2443c5a91a36d826aef61"
+```
--- a/cmd/evm/compiler.go
+++ b/cmd/evm/compiler.go
@@ -19,7 +19,7 @@ package main
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"os"

 	"github.com/ethereum/go-ethereum/cmd/evm/internal/compiler"

@@ -41,7 +41,7 @@ func compileCmd(ctx *cli.Context) error {
 	}

 	fn := ctx.Args().First()
-	src, err := ioutil.ReadFile(fn)
+	src, err := os.ReadFile(fn)
 	if err != nil {
 		return err
 	}
--- a/cmd/evm/disasm.go
+++ b/cmd/evm/disasm.go
@@ -19,7 +19,7 @@ package main
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"

 	"github.com/ethereum/go-ethereum/core/asm"
@@ -38,7 +38,7 @@ func disasmCmd(ctx *cli.Context) error {
 	switch {
 	case len(ctx.Args().First()) > 0:
 		fn := ctx.Args().First()
-		input, err := ioutil.ReadFile(fn)
+		input, err := os.ReadFile(fn)
 		if err != nil {
 			return err
 		}
@@ -46,7 +46,7 @@ func disasmCmd(ctx *cli.Context) error {
 	case ctx.GlobalIsSet(InputFlag.Name):
 		in = ctx.GlobalString(InputFlag.Name)
 	default:
-		return errors.New("Missing filename or --input value")
+		return errors.New("missing filename or --input value")
 	}

 	code := strings.TrimSpace(in)
--- a/cmd/evm/internal/t8ntool/block.go
+++ b/cmd/evm/internal/t8ntool/block.go
@@ -0,0 +1,380 @@
+// Copyright 2021 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package t8ntool
+
+import (
+	"crypto/ecdsa"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"math/big"
+	"os"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/consensus/clique"
+	"github.com/ethereum/go-ethereum/consensus/ethash"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/rlp"
+	"gopkg.in/urfave/cli.v1"
+)
+
+//go:generate go run github.com/fjl/gencodec -type header -field-override headerMarshaling -out gen_header.go
+type header struct {
+	ParentHash  common.Hash       `json:"parentHash"`
+	OmmerHash   *common.Hash      `json:"sha3Uncles"`
+	Coinbase    *common.Address   `json:"miner"`
+	Root        common.Hash       `json:"stateRoot"        gencodec:"required"`
+	TxHash      *common.Hash      `json:"transactionsRoot"`
+	ReceiptHash *common.Hash      `json:"receiptsRoot"`
+	Bloom       types.Bloom       `json:"logsBloom"`
+	Difficulty  *big.Int          `json:"difficulty"`
+	Number      *big.Int          `json:"number"           gencodec:"required"`
+	GasLimit    uint64            `json:"gasLimit"         gencodec:"required"`
+	GasUsed     uint64            `json:"gasUsed"`
+	Time        uint64            `json:"timestamp"        gencodec:"required"`
+	Extra       []byte            `json:"extraData"`
+	MixDigest   common.Hash       `json:"mixHash"`
+	Nonce       *types.BlockNonce `json:"nonce"`
+	BaseFee     *big.Int          `json:"baseFeePerGas" rlp:"optional"`
+}
+
+type headerMarshaling struct {
+	Difficulty *math.HexOrDecimal256
+	Number     *math.HexOrDecimal256
+	GasLimit   math.HexOrDecimal64
+	GasUsed    math.HexOrDecimal64
+	Time       math.HexOrDecimal64
+	Extra      hexutil.Bytes
+	BaseFee    *math.HexOrDecimal256
+}
+
+type bbInput struct {
+	Header    *header      `json:"header,omitempty"`
+	OmmersRlp []string     `json:"ommers,omitempty"`
+	TxRlp     string       `json:"txs,omitempty"`
+	Clique    *cliqueInput `json:"clique,omitempty"`
+
+	Ethash    bool                 `json:"-"`
+	EthashDir string               `json:"-"`
+	PowMode   ethash.Mode          `json:"-"`
+	Txs       []*types.Transaction `json:"-"`
+	Ommers    []*types.Header      `json:"-"`
+}
+
+type cliqueInput struct {
+	Key       *ecdsa.PrivateKey
+	Voted     *common.Address
+	Authorize *bool
+	Vanity    common.Hash
+}
+
+// UnmarshalJSON implements json.Unmarshaler interface.
+func (c *cliqueInput) UnmarshalJSON(input []byte) error {
+	var x struct {
+		Key       *common.Hash    `json:"secretKey"`
+		Voted     *common.Address `json:"voted"`
+		Authorize *bool           `json:"authorize"`
+		Vanity    common.Hash     `json:"vanity"`
+	}
+	if err := json.Unmarshal(input, &x); err != nil {
+		return err
+	}
+	if x.Key == nil {
+		return errors.New("missing required field 'secretKey' for cliqueInput")
+	}
+	if ecdsaKey, err := crypto.ToECDSA(x.Key[:]); err != nil {
+		return err
+	} else {
+		c.Key = ecdsaKey
+	}
+	c.Voted = x.Voted
+	c.Authorize = x.Authorize
+	c.Vanity = x.Vanity
+	return nil
+}
+
+// ToBlock converts i into a *types.Block
+func (i *bbInput) ToBlock() *types.Block {
+	header := &types.Header{
+		ParentHash:  i.Header.ParentHash,
+		UncleHash:   types.EmptyUncleHash,
+		Coinbase:    common.Address{},
+		Root:        i.Header.Root,
+		TxHash:      types.EmptyRootHash,
+		ReceiptHash: types.EmptyRootHash,
+		Bloom:       i.Header.Bloom,
+		Difficulty:  common.Big0,
+		Number:      i.Header.Number,
+		GasLimit:    i.Header.GasLimit,
+		GasUsed:     i.Header.GasUsed,
+		Time:        i.Header.Time,
+		Extra:       i.Header.Extra,
+		MixDigest:   i.Header.MixDigest,
+		BaseFee:     i.Header.BaseFee,
+	}
+
+	// Fill optional values.
+	if i.Header.OmmerHash != nil {
+		header.UncleHash = *i.Header.OmmerHash
+	} else if len(i.Ommers) != 0 {
+		// Calculate the ommer hash if none is provided and there are ommers to hash
+		header.UncleHash = types.CalcUncleHash(i.Ommers)
+	}
+	if i.Header.Coinbase != nil {
+		header.Coinbase = *i.Header.Coinbase
+	}
+	if i.Header.TxHash != nil {
+		header.TxHash = *i.Header.TxHash
+	}
+	if i.Header.ReceiptHash != nil {
+		header.ReceiptHash = *i.Header.ReceiptHash
+	}
+	if i.Header.Nonce != nil {
+		header.Nonce = *i.Header.Nonce
+	}
+	if header.Difficulty != nil {
+		header.Difficulty = i.Header.Difficulty
+	}
+	return types.NewBlockWithHeader(header).WithBody(i.Txs, i.Ommers)
+}
+
+// SealBlock seals the given block using the configured engine.
+func (i *bbInput) SealBlock(block *types.Block) (*types.Block, error) {
+	switch {
+	case i.Ethash:
+		return i.sealEthash(block)
+	case i.Clique != nil:
+		return i.sealClique(block)
+	default:
+		return block, nil
+	}
+}
+
+// sealEthash seals the given block using ethash.
+func (i *bbInput) sealEthash(block *types.Block) (*types.Block, error) {
+	if i.Header.Nonce != nil {
+		return nil, NewError(ErrorConfig, fmt.Errorf("sealing with ethash will overwrite provided nonce"))
+	}
+	ethashConfig := ethash.Config{
+		PowMode:        i.PowMode,
+		DatasetDir:     i.EthashDir,
+		CacheDir:       i.EthashDir,
+		DatasetsInMem:  1,
+		DatasetsOnDisk: 2,
+		CachesInMem:    2,
+		CachesOnDisk:   3,
+	}
+	engine := ethash.New(ethashConfig, nil, true)
+	defer engine.Close()
+	// Use a buffered chan for results.
+	// If the testmode is used, the sealer will return quickly, and complain
+	// "Sealing result is not read by miner" if it cannot write the result.
+	results := make(chan *types.Block, 1)
+	if err := engine.Seal(nil, block, results, nil); err != nil {
+		panic(fmt.Sprintf("failed to seal block: %v", err))
+	}
+	found := <-results
+	return block.WithSeal(found.Header()), nil
+}
+
+// sealClique seals the given block using clique.
+func (i *bbInput) sealClique(block *types.Block) (*types.Block, error) {
+	// If any clique value overwrites an explicit header value, fail
+	// to avoid silently building a block with unexpected values.
+	if i.Header.Extra != nil {
+		return nil, NewError(ErrorConfig, fmt.Errorf("sealing with clique will overwrite provided extra data"))
+	}
+	header := block.Header()
+	if i.Clique.Voted != nil {
+		if i.Header.Coinbase != nil {
+			return nil, NewError(ErrorConfig, fmt.Errorf("sealing with clique and voting will overwrite provided coinbase"))
+		}
+		header.Coinbase = *i.Clique.Voted
+	}
+	if i.Clique.Authorize != nil {
+		if i.Header.Nonce != nil {
+			return nil, NewError(ErrorConfig, fmt.Errorf("sealing with clique and voting will overwrite provided nonce"))
+		}
+		if *i.Clique.Authorize {
+			header.Nonce = [8]byte{}
+		} else {
+			header.Nonce = [8]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
+		}
+	}
+	// Extra is fixed 32 byte vanity and 65 byte signature
+	header.Extra = make([]byte, 32+65)
+	copy(header.Extra[0:32], i.Clique.Vanity.Bytes()[:])
+
+	// Sign the seal hash and fill in the rest of the extra data
+	h := clique.SealHash(header)
+	sighash, err := crypto.Sign(h[:], i.Clique.Key)
+	if err != nil {
+		return nil, err
+	}
+	copy(header.Extra[32:], sighash)
+	block = block.WithSeal(header)
+	return block, nil
+}
+
+// BuildBlock constructs a block from the given inputs.
+func BuildBlock(ctx *cli.Context) error {
+	// Configure the go-ethereum logger
+	glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
+	glogger.Verbosity(log.Lvl(ctx.Int(VerbosityFlag.Name)))
+	log.Root().SetHandler(glogger)
+
+	baseDir, err := createBasedir(ctx)
+	if err != nil {
+		return NewError(ErrorIO, fmt.Errorf("failed creating output basedir: %v", err))
+	}
+	inputData, err := readInput(ctx)
+	if err != nil {
+		return err
+	}
+	block := inputData.ToBlock()
+	block, err = inputData.SealBlock(block)
+	if err != nil {
+		return err
+	}
+	return dispatchBlock(ctx, baseDir, block)
+}
+
+func readInput(ctx *cli.Context) (*bbInput, error) {
+	var (
+		headerStr  = ctx.String(InputHeaderFlag.Name)
+		ommersStr  = ctx.String(InputOmmersFlag.Name)
+		txsStr     = ctx.String(InputTxsRlpFlag.Name)
+		cliqueStr  = ctx.String(SealCliqueFlag.Name)
+		ethashOn   = ctx.Bool(SealEthashFlag.Name)
+		ethashDir  = ctx.String(SealEthashDirFlag.Name)
+		ethashMode = ctx.String(SealEthashModeFlag.Name)
+		inputData  = &bbInput{}
+	)
+	if ethashOn && cliqueStr != "" {
+		return nil, NewError(ErrorConfig, fmt.Errorf("both ethash and clique sealing specified, only one may be chosen"))
+	}
+	if ethashOn {
+		inputData.Ethash = ethashOn
+		inputData.EthashDir = ethashDir
+		switch ethashMode {
+		case "normal":
+			inputData.PowMode = ethash.ModeNormal
+		case "test":
+			inputData.PowMode = ethash.ModeTest
+		case "fake":
+			inputData.PowMode = ethash.ModeFake
+		default:
+			return nil, NewError(ErrorConfig, fmt.Errorf("unknown pow mode: %s, supported modes: test, fake, normal", ethashMode))
+		}
+	}
+	if headerStr == stdinSelector || ommersStr == stdinSelector || txsStr == stdinSelector || cliqueStr == stdinSelector {
+		decoder := json.NewDecoder(os.Stdin)
+		if err := decoder.Decode(inputData); err != nil {
+			return nil, NewError(ErrorJson, fmt.Errorf("failed unmarshaling stdin: %v", err))
+		}
+	}
+	if cliqueStr != stdinSelector && cliqueStr != "" {
+		var clique cliqueInput
+		if err := readFile(cliqueStr, "clique", &clique); err != nil {
+			return nil, err
+		}
+		inputData.Clique = &clique
+	}
+	if headerStr != stdinSelector {
+		var env header
+		if err := readFile(headerStr, "header", &env); err != nil {
+			return nil, err
+		}
+		inputData.Header = &env
+	}
+	if ommersStr != stdinSelector && ommersStr != "" {
+		var ommers []string
+		if err := readFile(ommersStr, "ommers", &ommers); err != nil {
+			return nil, err
+		}
+		inputData.OmmersRlp = ommers
+	}
+	if txsStr != stdinSelector {
+		var txs string
+		if err := readFile(txsStr, "txs", &txs); err != nil {
+			return nil, err
+		}
+		inputData.TxRlp = txs
+	}
+	// Deserialize rlp txs and ommers
+	var (
+		ommers = []*types.Header{}
+		txs    = []*types.Transaction{}
+	)
+	if inputData.TxRlp != "" {
+		if err := rlp.DecodeBytes(common.FromHex(inputData.TxRlp), &txs); err != nil {
+			return nil, NewError(ErrorRlp, fmt.Errorf("unable to decode transaction from rlp data: %v", err))
+		}
+		inputData.Txs = txs
+	}
+	for _, str := range inputData.OmmersRlp {
+		type extblock struct {
+			Header *types.Header
+			Txs    []*types.Transaction
+			Ommers []*types.Header
+		}
+		var ommer *extblock
+		if err := rlp.DecodeBytes(common.FromHex(str), &ommer); err != nil {
+			return nil, NewError(ErrorRlp, fmt.Errorf("unable to decode ommer from rlp data: %v", err))
+		}
+		ommers = append(ommers, ommer.Header)
+	}
+	inputData.Ommers = ommers
+
+	return inputData, nil
+}
+
+// dispatchOutput writes the output data to either stderr or stdout, or to the specified
+// files
+func dispatchBlock(ctx *cli.Context, baseDir string, block *types.Block) error {
+	raw, _ := rlp.EncodeToBytes(block)
+
+	type blockInfo struct {
+		Rlp  hexutil.Bytes `json:"rlp"`
+		Hash common.Hash   `json:"hash"`
+	}
+	var enc blockInfo
+	enc.Rlp = raw
+	enc.Hash = block.Hash()
+
+	b, err := json.MarshalIndent(enc, "", "  ")
+	if err != nil {
+		return NewError(ErrorJson, fmt.Errorf("failed marshalling output: %v", err))
+	}
+	switch dest := ctx.String(OutputBlockFlag.Name); dest {
+	case "stdout":
+		os.Stdout.Write(b)
+		os.Stdout.WriteString("\n")
+	case "stderr":
+		os.Stderr.Write(b)
+		os.Stderr.WriteString("\n")
+	default:
+		if err := saveFile(baseDir, dest, enc); err != nil {
+			return err
+		}
+	}
+	return nil
+}
--- a/cmd/evm/internal/t8ntool/execution.go
+++ b/cmd/evm/internal/t8ntool/execution.go
@@ -23,6 +23,7 @@ import (

 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/consensus/ethash"
 	"github.com/ethereum/go-ethereum/consensus/misc"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/rawdb"
@@ -46,13 +47,15 @@ type Prestate struct {
 // ExecutionResult contains the execution status after running a state test, any
 // error that might have occurred and a dump of the final state if requested.
 type ExecutionResult struct {
-	StateRoot   common.Hash    `json:"stateRoot"`
-	TxRoot      common.Hash    `json:"txRoot"`
-	ReceiptRoot common.Hash    `json:"receiptRoot"`
-	LogsHash    common.Hash    `json:"logsHash"`
-	Bloom       types.Bloom    `json:"logsBloom"        gencodec:"required"`
-	Receipts    types.Receipts `json:"receipts"`
-	Rejected    []int          `json:"rejected,omitempty"`
+	StateRoot   common.Hash           `json:"stateRoot"`
+	TxRoot      common.Hash           `json:"txRoot"`
+	ReceiptRoot common.Hash           `json:"receiptsRoot"`
+	LogsHash    common.Hash           `json:"logsHash"`
+	Bloom       types.Bloom           `json:"logsBloom"        gencodec:"required"`
+	Receipts    types.Receipts        `json:"receipts"`
+	Rejected    []*rejectedTx         `json:"rejected,omitempty"`
+	Difficulty  *math.HexOrDecimal256 `json:"currentDifficulty" gencodec:"required"`
+	GasUsed     math.HexOrDecimal64   `json:"gasUsed"`
 }

 type ommer struct {
@@ -60,29 +63,43 @@ type ommer struct {
 	Address common.Address `json:"address"`
 }

-//go:generate gencodec -type stEnv -field-override stEnvMarshaling -out gen_stenv.go
+//go:generate go run github.com/fjl/gencodec -type stEnv -field-override stEnvMarshaling -out gen_stenv.go
 type stEnv struct {
-	Coinbase    common.Address                      `json:"currentCoinbase"   gencodec:"required"`
-	Difficulty  *big.Int                            `json:"currentDifficulty" gencodec:"required"`
-	GasLimit    uint64                              `json:"currentGasLimit"   gencodec:"required"`
-	Number      uint64                              `json:"currentNumber"     gencodec:"required"`
-	Timestamp   uint64                              `json:"currentTimestamp"  gencodec:"required"`
-	BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
-	Ommers      []ommer                             `json:"ommers,omitempty"`
+	Coinbase         common.Address                      `json:"currentCoinbase"   gencodec:"required"`
+	Difficulty       *big.Int                            `json:"currentDifficulty"`
+	Random           *big.Int                            `json:"currentRandom"`
+	ParentDifficulty *big.Int                            `json:"parentDifficulty"`
+	GasLimit         uint64                              `json:"currentGasLimit"   gencodec:"required"`
+	Number           uint64                              `json:"currentNumber"     gencodec:"required"`
+	Timestamp        uint64                              `json:"currentTimestamp"  gencodec:"required"`
+	ParentTimestamp  uint64                              `json:"parentTimestamp,omitempty"`
+	BlockHashes      map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
+	Ommers           []ommer                             `json:"ommers,omitempty"`
+	BaseFee          *big.Int                            `json:"currentBaseFee,omitempty"`
+	ParentUncleHash  common.Hash                         `json:"parentUncleHash"`
 }

 type stEnvMarshaling struct {
-	Coinbase   common.UnprefixedAddress
-	Difficulty *math.HexOrDecimal256
-	GasLimit   math.HexOrDecimal64
-	Number     math.HexOrDecimal64
-	Timestamp  math.HexOrDecimal64
+	Coinbase         common.UnprefixedAddress
+	Difficulty       *math.HexOrDecimal256
+	Random           *math.HexOrDecimal256
+	ParentDifficulty *math.HexOrDecimal256
+	GasLimit         math.HexOrDecimal64
+	Number           math.HexOrDecimal64
+	Timestamp        math.HexOrDecimal64
+	ParentTimestamp  math.HexOrDecimal64
+	BaseFee          *math.HexOrDecimal256
+}
+
+type rejectedTx struct {
+	Index int    `json:"index"`
+	Err   string `json:"error"`
 }

 // Apply applies a set of transactions to a pre-state
 func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 	txs types.Transactions, miningReward int64,
-	getTracerFn func(txIndex int, txHash common.Hash) (tracer vm.Tracer, err error)) (*state.StateDB, *ExecutionResult, error) {
+	getTracerFn func(txIndex int, txHash common.Hash) (tracer vm.EVMLogger, err error)) (*state.StateDB, *ExecutionResult, error) {

 	// Capture errors for BLOCKHASH operation, if we haven't been supplied the
 	// required blockhashes
@@ -103,7 +120,7 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 		signer      = types.MakeSigner(chainConfig, new(big.Int).SetUint64(pre.Env.Number))
 		gaspool     = new(core.GasPool)
 		blockHash   = common.Hash{0x13, 0x37}
-		rejectedTxs []int
+		rejectedTxs []*rejectedTx
 		includedTxs types.Transactions
 		gasUsed     = uint64(0)
 		receipts    = make(types.Receipts, 0)
@@ -120,6 +137,15 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 		GasLimit:    pre.Env.GasLimit,
 		GetHash:     getHash,
 	}
+	// If currentBaseFee is defined, add it to the vmContext.
+	if pre.Env.BaseFee != nil {
+		vmContext.BaseFee = new(big.Int).Set(pre.Env.BaseFee)
+	}
+	// If random is defined, add it to the vmContext.
+	if pre.Env.Random != nil {
+		rnd := common.BigToHash(pre.Env.Random)
+		vmContext.Random = &rnd
+	}
 	// If DAO is supported/enabled, we need to handle it here. In geth 'proper', it's
 	// done in StateProcessor.Process(block, ...), right before transactions are applied.
 	if chainConfig.DAOForkSupport &&
@@ -129,10 +155,10 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 	}

 	for i, tx := range txs {
-		msg, err := tx.AsMessage(signer)
+		msg, err := tx.AsMessage(signer, pre.Env.BaseFee)
 		if err != nil {
-			log.Info("rejected tx", "index", i, "hash", tx.Hash(), "error", err)
-			rejectedTxs = append(rejectedTxs, i)
+			log.Warn("rejected tx", "index", i, "hash", tx.Hash(), "error", err)
+			rejectedTxs = append(rejectedTxs, &rejectedTx{i, err.Error()})
 			continue
 		}
 		tracer, err := getTracerFn(txIndex, tx.Hash())
@@ -141,7 +167,7 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 		}
 		vmConfig.Tracer = tracer
 		vmConfig.Debug = (tracer != nil)
-		statedb.Prepare(tx.Hash(), blockHash, txIndex)
+		statedb.Prepare(tx.Hash(), txIndex)
 		txContext := core.NewEVMTxContext(msg)
 		snapshot := statedb.Snapshot()
 		evm := vm.NewEVM(vmContext, txContext, statedb, chainConfig, vmConfig)
@@ -151,7 +177,7 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 		if err != nil {
 			statedb.RevertToSnapshot(snapshot)
 			log.Info("rejected tx", "index", i, "hash", tx.Hash(), "from", msg.From(), "error", err)
-			rejectedTxs = append(rejectedTxs, i)
+			rejectedTxs = append(rejectedTxs, &rejectedTx{i, err.Error()})
 			continue
 		}
 		includedTxs = append(includedTxs, tx)
@@ -186,7 +212,7 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 			}

 			// Set the receipt logs and create the bloom filter.
-			receipt.Logs = statedb.GetLogs(tx.Hash())
+			receipt.Logs = statedb.GetLogs(tx.Hash(), blockHash)
 			receipt.Bloom = types.CreateBloom(types.Receipts{receipt})
 			// These three are non-consensus fields:
 			//receipt.BlockHash
@@ -236,6 +262,8 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 		LogsHash:    rlpHash(statedb.Logs()),
 		Receipts:    receipts,
 		Rejected:    rejectedTxs,
+		Difficulty:  (*math.HexOrDecimal256)(vmContext.Difficulty),
+		GasUsed:     (math.HexOrDecimal64)(gasUsed),
 	}
 	return statedb, execRs, nil
 }
@@ -263,3 +291,23 @@ func rlpHash(x interface{}) (h common.Hash) {
 	hw.Sum(h[:0])
 	return h
 }
+
+// calcDifficulty is based on ethash.CalcDifficulty. This method is used in case
+// the caller does not provide an explicit difficulty, but instead provides only
+// parent timestamp + difficulty.
+// Note: this method only works for ethash engine.
+func calcDifficulty(config *params.ChainConfig, number, currentTime, parentTime uint64,
+	parentDifficulty *big.Int, parentUncleHash common.Hash) *big.Int {
+	uncleHash := parentUncleHash
+	if uncleHash == (common.Hash{}) {
+		uncleHash = types.EmptyUncleHash
+	}
+	parent := &types.Header{
+		ParentHash: common.Hash{},
+		UncleHash:  uncleHash,
+		Difficulty: parentDifficulty,
+		Number:     new(big.Int).SetUint64(number - 1),
+		Time:       parentTime,
+	}
+	return ethash.CalcDifficulty(config, currentTime, parent)
+}
--- a/cmd/evm/internal/t8ntool/flags.go
+++ b/cmd/evm/internal/t8ntool/flags.go
@@ -30,17 +30,25 @@ var (
 		Name:  "trace",
 		Usage: "Output full trace logs to files <txhash>.jsonl",
 	}
-	TraceDisableMemoryFlag = cli.BoolFlag{
+	TraceDisableMemoryFlag = cli.BoolTFlag{
 		Name:  "trace.nomemory",
-		Usage: "Disable full memory dump in traces",
+		Usage: "Disable full memory dump in traces (deprecated)",
+	}
+	TraceEnableMemoryFlag = cli.BoolFlag{
+		Name:  "trace.memory",
+		Usage: "Enable full memory dump in traces",
 	}
 	TraceDisableStackFlag = cli.BoolFlag{
 		Name:  "trace.nostack",
 		Usage: "Disable stack output in traces",
 	}
-	TraceDisableReturnDataFlag = cli.BoolFlag{
+	TraceDisableReturnDataFlag = cli.BoolTFlag{
 		Name:  "trace.noreturndata",
-		Usage: "Disable return data output in traces",
+		Usage: "Disable return data output in traces (deprecated)",
+	}
+	TraceEnableReturnDataFlag = cli.BoolFlag{
+		Name:  "trace.returndata",
+		Usage: "Enable return data output in traces",
 	}
 	OutputBasedir = cli.StringFlag{
 		Name:  "output.basedir",
@@ -68,6 +76,14 @@ var (
 			"\t<file> - into the file <file> ",
 		Value: "result.json",
 	}
+	OutputBlockFlag = cli.StringFlag{
+		Name: "output.block",
+		Usage: "Determines where to put the `block` after building.\n" +
+			"\t`stdout` - into the stdout output\n" +
+			"\t`stderr` - into the stderr output\n" +
+			"\t<file> - into the file <file> ",
+		Value: "block.json",
+	}
 	InputAllocFlag = cli.StringFlag{
 		Name:  "input.alloc",
 		Usage: "`stdin` or file name of where to find the prestate alloc to use.",
@@ -79,10 +95,43 @@ var (
 		Value: "env.json",
 	}
 	InputTxsFlag = cli.StringFlag{
-		Name:  "input.txs",
-		Usage: "`stdin` or file name of where to find the transactions to apply.",
+		Name: "input.txs",
+		Usage: "`stdin` or file name of where to find the transactions to apply. " +
+			"If the file extension is '.rlp', then the data is interpreted as an RLP list of signed transactions." +
+			"The '.rlp' format is identical to the output.body format.",
 		Value: "txs.json",
 	}
+	InputHeaderFlag = cli.StringFlag{
+		Name:  "input.header",
+		Usage: "`stdin` or file name of where to find the block header to use.",
+		Value: "header.json",
+	}
+	InputOmmersFlag = cli.StringFlag{
+		Name:  "input.ommers",
+		Usage: "`stdin` or file name of where to find the list of ommer header RLPs to use.",
+	}
+	InputTxsRlpFlag = cli.StringFlag{
+		Name:  "input.txs",
+		Usage: "`stdin` or file name of where to find the transactions list in RLP form.",
+		Value: "txs.rlp",
+	}
+	SealCliqueFlag = cli.StringFlag{
+		Name:  "seal.clique",
+		Usage: "Seal block with Clique. `stdin` or file name of where to find the Clique sealing data.",
+	}
+	SealEthashFlag = cli.BoolFlag{
+		Name:  "seal.ethash",
+		Usage: "Seal block with ethash.",
+	}
+	SealEthashDirFlag = cli.StringFlag{
+		Name:  "seal.ethash.dir",
+		Usage: "Path to ethash DAG. If none exists, a new DAG will be generated.",
+	}
+	SealEthashModeFlag = cli.StringFlag{
+		Name:  "seal.ethash.mode",
+		Usage: "Defines the type and amount of PoW verification an ethash engine makes.",
+		Value: "normal",
+	}
 	RewardFlag = cli.Int64Flag{
 		Name:  "state.reward",
 		Usage: "Mining reward. Set to -1 to disable",
@@ -103,7 +152,7 @@ var (
 			"\n\tSyntax <forkname>(+ExtraEip)",
 			strings.Join(tests.AvailableForks(), "\n\t    "),
 			strings.Join(vm.ActivateableEips(), ", ")),
-		Value: "Istanbul",
+		Value: "ArrowGlacier",
 	}
 	VerbosityFlag = cli.IntFlag{
 		Name:  "verbosity",
--- a/cmd/evm/internal/t8ntool/gen_header.go
+++ b/cmd/evm/internal/t8ntool/gen_header.go
@@ -0,0 +1,135 @@
+// Code generated by github.com/fjl/gencodec. DO NOT EDIT.
+
+package t8ntool
+
+import (
+	"encoding/json"
+	"errors"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+var _ = (*headerMarshaling)(nil)
+
+// MarshalJSON marshals as JSON.
+func (h header) MarshalJSON() ([]byte, error) {
+	type header struct {
+		ParentHash  common.Hash           `json:"parentHash"`
+		OmmerHash   *common.Hash          `json:"sha3Uncles"`
+		Coinbase    *common.Address       `json:"miner"`
+		Root        common.Hash           `json:"stateRoot"        gencodec:"required"`
+		TxHash      *common.Hash          `json:"transactionsRoot"`
+		ReceiptHash *common.Hash          `json:"receiptsRoot"`
+		Bloom       types.Bloom           `json:"logsBloom"`
+		Difficulty  *math.HexOrDecimal256 `json:"difficulty"`
+		Number      *math.HexOrDecimal256 `json:"number"           gencodec:"required"`
+		GasLimit    math.HexOrDecimal64   `json:"gasLimit"         gencodec:"required"`
+		GasUsed     math.HexOrDecimal64   `json:"gasUsed"`
+		Time        math.HexOrDecimal64   `json:"timestamp"        gencodec:"required"`
+		Extra       hexutil.Bytes         `json:"extraData"`
+		MixDigest   common.Hash           `json:"mixHash"`
+		Nonce       *types.BlockNonce     `json:"nonce"`
+		BaseFee     *math.HexOrDecimal256 `json:"baseFeePerGas" rlp:"optional"`
+	}
+	var enc header
+	enc.ParentHash = h.ParentHash
+	enc.OmmerHash = h.OmmerHash
+	enc.Coinbase = h.Coinbase
+	enc.Root = h.Root
+	enc.TxHash = h.TxHash
+	enc.ReceiptHash = h.ReceiptHash
+	enc.Bloom = h.Bloom
+	enc.Difficulty = (*math.HexOrDecimal256)(h.Difficulty)
+	enc.Number = (*math.HexOrDecimal256)(h.Number)
+	enc.GasLimit = math.HexOrDecimal64(h.GasLimit)
+	enc.GasUsed = math.HexOrDecimal64(h.GasUsed)
+	enc.Time = math.HexOrDecimal64(h.Time)
+	enc.Extra = h.Extra
+	enc.MixDigest = h.MixDigest
+	enc.Nonce = h.Nonce
+	enc.BaseFee = (*math.HexOrDecimal256)(h.BaseFee)
+	return json.Marshal(&enc)
+}
+
+// UnmarshalJSON unmarshals from JSON.
+func (h *header) UnmarshalJSON(input []byte) error {
+	type header struct {
+		ParentHash  *common.Hash          `json:"parentHash"`
+		OmmerHash   *common.Hash          `json:"sha3Uncles"`
+		Coinbase    *common.Address       `json:"miner"`
+		Root        *common.Hash          `json:"stateRoot"        gencodec:"required"`
+		TxHash      *common.Hash          `json:"transactionsRoot"`
+		ReceiptHash *common.Hash          `json:"receiptsRoot"`
+		Bloom       *types.Bloom          `json:"logsBloom"`
+		Difficulty  *math.HexOrDecimal256 `json:"difficulty"`
+		Number      *math.HexOrDecimal256 `json:"number"           gencodec:"required"`
+		GasLimit    *math.HexOrDecimal64  `json:"gasLimit"         gencodec:"required"`
+		GasUsed     *math.HexOrDecimal64  `json:"gasUsed"`
+		Time        *math.HexOrDecimal64  `json:"timestamp"        gencodec:"required"`
+		Extra       *hexutil.Bytes        `json:"extraData"`
+		MixDigest   *common.Hash          `json:"mixHash"`
+		Nonce       *types.BlockNonce     `json:"nonce"`
+		BaseFee     *math.HexOrDecimal256 `json:"baseFeePerGas" rlp:"optional"`
+	}
+	var dec header
+	if err := json.Unmarshal(input, &dec); err != nil {
+		return err
+	}
+	if dec.ParentHash != nil {
+		h.ParentHash = *dec.ParentHash
+	}
+	if dec.OmmerHash != nil {
+		h.OmmerHash = dec.OmmerHash
+	}
+	if dec.Coinbase != nil {
+		h.Coinbase = dec.Coinbase
+	}
+	if dec.Root == nil {
+		return errors.New("missing required field 'stateRoot' for header")
+	}
+	h.Root = *dec.Root
+	if dec.TxHash != nil {
+		h.TxHash = dec.TxHash
+	}
+	if dec.ReceiptHash != nil {
+		h.ReceiptHash = dec.ReceiptHash
+	}
+	if dec.Bloom != nil {
+		h.Bloom = *dec.Bloom
+	}
+	if dec.Difficulty != nil {
+		h.Difficulty = (*big.Int)(dec.Difficulty)
+	}
+	if dec.Number == nil {
+		return errors.New("missing required field 'number' for header")
+	}
+	h.Number = (*big.Int)(dec.Number)
+	if dec.GasLimit == nil {
+		return errors.New("missing required field 'gasLimit' for header")
+	}
+	h.GasLimit = uint64(*dec.GasLimit)
+	if dec.GasUsed != nil {
+		h.GasUsed = uint64(*dec.GasUsed)
+	}
+	if dec.Time == nil {
+		return errors.New("missing required field 'timestamp' for header")
+	}
+	h.Time = uint64(*dec.Time)
+	if dec.Extra != nil {
+		h.Extra = *dec.Extra
+	}
+	if dec.MixDigest != nil {
+		h.MixDigest = *dec.MixDigest
+	}
+	if dec.Nonce != nil {
+		h.Nonce = dec.Nonce
+	}
+	if dec.BaseFee != nil {
+		h.BaseFee = (*big.Int)(dec.BaseFee)
+	}
+	return nil
+}
--- a/cmd/evm/internal/t8ntool/gen_stenv.go
+++ b/cmd/evm/internal/t8ntool/gen_stenv.go
@@ -16,35 +16,50 @@ var _ = (*stEnvMarshaling)(nil)
 // MarshalJSON marshals as JSON.
 func (s stEnv) MarshalJSON() ([]byte, error) {
 	type stEnv struct {
-		Coinbase    common.UnprefixedAddress            `json:"currentCoinbase"   gencodec:"required"`
-		Difficulty  *math.HexOrDecimal256               `json:"currentDifficulty" gencodec:"required"`
-		GasLimit    math.HexOrDecimal64                 `json:"currentGasLimit"   gencodec:"required"`
-		Number      math.HexOrDecimal64                 `json:"currentNumber"     gencodec:"required"`
-		Timestamp   math.HexOrDecimal64                 `json:"currentTimestamp"  gencodec:"required"`
-		BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
-		Ommers      []ommer                             `json:"ommers,omitempty"`
+		Coinbase         common.UnprefixedAddress            `json:"currentCoinbase"   gencodec:"required"`
+		Difficulty       *math.HexOrDecimal256               `json:"currentDifficulty"`
+		Random           *math.HexOrDecimal256               `json:"currentRandom"`
+		ParentDifficulty *math.HexOrDecimal256               `json:"parentDifficulty"`
+		GasLimit         math.HexOrDecimal64                 `json:"currentGasLimit"   gencodec:"required"`
+		Number           math.HexOrDecimal64                 `json:"currentNumber"     gencodec:"required"`
+		Timestamp        math.HexOrDecimal64                 `json:"currentTimestamp"  gencodec:"required"`
+		ParentTimestamp  math.HexOrDecimal64                 `json:"parentTimestamp,omitempty"`
+		BlockHashes      map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
+		Ommers           []ommer                             `json:"ommers,omitempty"`
+		BaseFee          *math.HexOrDecimal256               `json:"currentBaseFee,omitempty"`
+		ParentUncleHash  common.Hash                         `json:"parentUncleHash"`
 	}
 	var enc stEnv
 	enc.Coinbase = common.UnprefixedAddress(s.Coinbase)
 	enc.Difficulty = (*math.HexOrDecimal256)(s.Difficulty)
+	enc.Random = (*math.HexOrDecimal256)(s.Random)
+	enc.ParentDifficulty = (*math.HexOrDecimal256)(s.ParentDifficulty)
 	enc.GasLimit = math.HexOrDecimal64(s.GasLimit)
 	enc.Number = math.HexOrDecimal64(s.Number)
 	enc.Timestamp = math.HexOrDecimal64(s.Timestamp)
+	enc.ParentTimestamp = math.HexOrDecimal64(s.ParentTimestamp)
 	enc.BlockHashes = s.BlockHashes
 	enc.Ommers = s.Ommers
+	enc.BaseFee = (*math.HexOrDecimal256)(s.BaseFee)
+	enc.ParentUncleHash = s.ParentUncleHash
 	return json.Marshal(&enc)
 }

 // UnmarshalJSON unmarshals from JSON.
 func (s *stEnv) UnmarshalJSON(input []byte) error {
 	type stEnv struct {
-		Coinbase    *common.UnprefixedAddress           `json:"currentCoinbase"   gencodec:"required"`
-		Difficulty  *math.HexOrDecimal256               `json:"currentDifficulty" gencodec:"required"`
-		GasLimit    *math.HexOrDecimal64                `json:"currentGasLimit"   gencodec:"required"`
-		Number      *math.HexOrDecimal64                `json:"currentNumber"     gencodec:"required"`
-		Timestamp   *math.HexOrDecimal64                `json:"currentTimestamp"  gencodec:"required"`
-		BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
-		Ommers      []ommer                             `json:"ommers,omitempty"`
+		Coinbase         *common.UnprefixedAddress           `json:"currentCoinbase"   gencodec:"required"`
+		Difficulty       *math.HexOrDecimal256               `json:"currentDifficulty"`
+		Random           *math.HexOrDecimal256               `json:"currentRandom"`
+		ParentDifficulty *math.HexOrDecimal256               `json:"parentDifficulty"`
+		GasLimit         *math.HexOrDecimal64                `json:"currentGasLimit"   gencodec:"required"`
+		Number           *math.HexOrDecimal64                `json:"currentNumber"     gencodec:"required"`
+		Timestamp        *math.HexOrDecimal64                `json:"currentTimestamp"  gencodec:"required"`
+		ParentTimestamp  *math.HexOrDecimal64                `json:"parentTimestamp,omitempty"`
+		BlockHashes      map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
+		Ommers           []ommer                             `json:"ommers,omitempty"`
+		BaseFee          *math.HexOrDecimal256               `json:"currentBaseFee,omitempty"`
+		ParentUncleHash  *common.Hash                        `json:"parentUncleHash"`
 	}
 	var dec stEnv
 	if err := json.Unmarshal(input, &dec); err != nil {
@@ -54,10 +69,15 @@ func (s *stEnv) UnmarshalJSON(input []byte) error {
 		return errors.New("missing required field 'currentCoinbase' for stEnv")
 	}
 	s.Coinbase = common.Address(*dec.Coinbase)
-	if dec.Difficulty == nil {
-		return errors.New("missing required field 'currentDifficulty' for stEnv")
+	if dec.Difficulty != nil {
+		s.Difficulty = (*big.Int)(dec.Difficulty)
+	}
+	if dec.Random != nil {
+		s.Random = (*big.Int)(dec.Random)
+	}
+	if dec.ParentDifficulty != nil {
+		s.ParentDifficulty = (*big.Int)(dec.ParentDifficulty)
 	}
-	s.Difficulty = (*big.Int)(dec.Difficulty)
 	if dec.GasLimit == nil {
 		return errors.New("missing required field 'currentGasLimit' for stEnv")
 	}
@@ -70,11 +90,20 @@ func (s *stEnv) UnmarshalJSON(input []byte) error {
 		return errors.New("missing required field 'currentTimestamp' for stEnv")
 	}
 	s.Timestamp = uint64(*dec.Timestamp)
+	if dec.ParentTimestamp != nil {
+		s.ParentTimestamp = uint64(*dec.ParentTimestamp)
+	}
 	if dec.BlockHashes != nil {
 		s.BlockHashes = dec.BlockHashes
 	}
 	if dec.Ommers != nil {
 		s.Ommers = dec.Ommers
 	}
+	if dec.BaseFee != nil {
+		s.BaseFee = (*big.Int)(dec.BaseFee)
+	}
+	if dec.ParentUncleHash != nil {
+		s.ParentUncleHash = *dec.ParentUncleHash
+	}
 	return nil
 }
--- a/cmd/evm/internal/t8ntool/transaction.go
+++ b/cmd/evm/internal/t8ntool/transaction.go
@@ -0,0 +1,179 @@
+// Copyright 2021 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package t8ntool
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"math/big"
+	"os"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/rlp"
+	"github.com/ethereum/go-ethereum/tests"
+	"gopkg.in/urfave/cli.v1"
+)
+
+type result struct {
+	Error        error
+	Address      common.Address
+	Hash         common.Hash
+	IntrinsicGas uint64
+}
+
+// MarshalJSON marshals as JSON with a hash.
+func (r *result) MarshalJSON() ([]byte, error) {
+	type xx struct {
+		Error        string          `json:"error,omitempty"`
+		Address      *common.Address `json:"address,omitempty"`
+		Hash         *common.Hash    `json:"hash,omitempty"`
+		IntrinsicGas hexutil.Uint64  `json:"intrinsicGas,omitempty"`
+	}
+	var out xx
+	if r.Error != nil {
+		out.Error = r.Error.Error()
+	}
+	if r.Address != (common.Address{}) {
+		out.Address = &r.Address
+	}
+	if r.Hash != (common.Hash{}) {
+		out.Hash = &r.Hash
+	}
+	out.IntrinsicGas = hexutil.Uint64(r.IntrinsicGas)
+	return json.Marshal(out)
+}
+
+func Transaction(ctx *cli.Context) error {
+	// Configure the go-ethereum logger
+	glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
+	glogger.Verbosity(log.Lvl(ctx.Int(VerbosityFlag.Name)))
+	log.Root().SetHandler(glogger)
+
+	var (
+		err error
+	)
+	// We need to load the transactions. May be either in stdin input or in files.
+	// Check if anything needs to be read from stdin
+	var (
+		txStr       = ctx.String(InputTxsFlag.Name)
+		inputData   = &input{}
+		chainConfig *params.ChainConfig
+	)
+	// Construct the chainconfig
+	if cConf, _, err := tests.GetChainConfig(ctx.String(ForknameFlag.Name)); err != nil {
+		return NewError(ErrorConfig, fmt.Errorf("failed constructing chain configuration: %v", err))
+	} else {
+		chainConfig = cConf
+	}
+	// Set the chain id
+	chainConfig.ChainID = big.NewInt(ctx.Int64(ChainIDFlag.Name))
+	var body hexutil.Bytes
+	if txStr == stdinSelector {
+		decoder := json.NewDecoder(os.Stdin)
+		if err := decoder.Decode(inputData); err != nil {
+			return NewError(ErrorJson, fmt.Errorf("failed unmarshaling stdin: %v", err))
+		}
+		// Decode the body of already signed transactions
+		body = common.FromHex(inputData.TxRlp)
+	} else {
+		// Read input from file
+		inFile, err := os.Open(txStr)
+		if err != nil {
+			return NewError(ErrorIO, fmt.Errorf("failed reading txs file: %v", err))
+		}
+		defer inFile.Close()
+		decoder := json.NewDecoder(inFile)
+		if strings.HasSuffix(txStr, ".rlp") {
+			if err := decoder.Decode(&body); err != nil {
+				return err
+			}
+		} else {
+			return NewError(ErrorIO, errors.New("only rlp supported"))
+		}
+	}
+	signer := types.MakeSigner(chainConfig, new(big.Int))
+	// We now have the transactions in 'body', which is supposed to be an
+	// rlp list of transactions
+	it, err := rlp.NewListIterator([]byte(body))
+	if err != nil {
+		return err
+	}
+	var results []result
+	for it.Next() {
+		if err := it.Err(); err != nil {
+			return NewError(ErrorIO, err)
+		}
+		var tx types.Transaction
+		err := rlp.DecodeBytes(it.Value(), &tx)
+		if err != nil {
+			results = append(results, result{Error: err})
+			continue
+		}
+		r := result{Hash: tx.Hash()}
+		if sender, err := types.Sender(signer, &tx); err != nil {
+			r.Error = err
+			results = append(results, r)
+			continue
+		} else {
+			r.Address = sender
+		}
+		// Check intrinsic gas
+		if gas, err := core.IntrinsicGas(tx.Data(), tx.AccessList(), tx.To() == nil,
+			chainConfig.IsHomestead(new(big.Int)), chainConfig.IsIstanbul(new(big.Int))); err != nil {
+			r.Error = err
+			results = append(results, r)
+			continue
+		} else {
+			r.IntrinsicGas = gas
+			if tx.Gas() < gas {
+				r.Error = fmt.Errorf("%w: have %d, want %d", core.ErrIntrinsicGas, tx.Gas(), gas)
+				results = append(results, r)
+				continue
+			}
+		}
+		// Validate <256bit fields
+		switch {
+		case tx.Nonce()+1 < tx.Nonce():
+			r.Error = errors.New("nonce exceeds 2^64-1")
+		case tx.Value().BitLen() > 256:
+			r.Error = errors.New("value exceeds 256 bits")
+		case tx.GasPrice().BitLen() > 256:
+			r.Error = errors.New("gasPrice exceeds 256 bits")
+		case tx.GasTipCap().BitLen() > 256:
+			r.Error = errors.New("maxPriorityFeePerGas exceeds 256 bits")
+		case tx.GasFeeCap().BitLen() > 256:
+			r.Error = errors.New("maxFeePerGas exceeds 256 bits")
+		case tx.GasFeeCap().Cmp(tx.GasTipCap()) < 0:
+			r.Error = errors.New("maxFeePerGas < maxPriorityFeePerGas")
+		case new(big.Int).Mul(tx.GasPrice(), new(big.Int).SetUint64(tx.Gas())).BitLen() > 256:
+			r.Error = errors.New("gas * gasPrice exceeds 256 bits")
+		case new(big.Int).Mul(tx.GasFeeCap(), new(big.Int).SetUint64(tx.Gas())).BitLen() > 256:
+			r.Error = errors.New("gas * maxFeePerGas exceeds 256 bits")
+		}
+		results = append(results, r)
+	}
+	out, err := json.MarshalIndent(results, "", "  ")
+	fmt.Println(string(out))
+	return err
+}
--- a/cmd/evm/internal/t8ntool/transition.go
+++ b/cmd/evm/internal/t8ntool/transition.go
@@ -19,11 +19,12 @@ package t8ntool
 import (
 	"crypto/ecdsa"
 	"encoding/json"
+	"errors"
 	"fmt"
-	"io/ioutil"
 	"math/big"
 	"os"
 	"path"
+	"strings"

 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -32,6 +33,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/eth/tracers/logger"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
@@ -41,11 +43,12 @@ import (

 const (
 	ErrorEVM              = 2
-	ErrorVMConfig         = 3
+	ErrorConfig           = 3
 	ErrorMissingBlockhash = 4

 	ErrorJson = 10
 	ErrorIO   = 11
+	ErrorRlp  = 12

 	stdinSelector = "stdin"
 )
@@ -63,46 +66,57 @@ func (n *NumberedError) Error() string {
 	return fmt.Sprintf("ERROR(%d): %v", n.errorCode, n.err.Error())
 }

-func (n *NumberedError) Code() int {
+func (n *NumberedError) ExitCode() int {
 	return n.errorCode
 }

+// compile-time conformance test
+var (
+	_ cli.ExitCoder = (*NumberedError)(nil)
+)
+
 type input struct {
 	Alloc core.GenesisAlloc `json:"alloc,omitempty"`
 	Env   *stEnv            `json:"env,omitempty"`
 	Txs   []*txWithKey      `json:"txs,omitempty"`
+	TxRlp string            `json:"txsRlp,omitempty"`
 }

-func Main(ctx *cli.Context) error {
+func Transition(ctx *cli.Context) error {
 	// Configure the go-ethereum logger
 	glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
 	glogger.Verbosity(log.Lvl(ctx.Int(VerbosityFlag.Name)))
 	log.Root().SetHandler(glogger)

 	var (
-		err     error
-		tracer  vm.Tracer
-		baseDir = ""
+		err    error
+		tracer vm.EVMLogger
 	)
-	var getTracer func(txIndex int, txHash common.Hash) (vm.Tracer, error)
+	var getTracer func(txIndex int, txHash common.Hash) (vm.EVMLogger, error)

-	// If user specified a basedir, make sure it exists
-	if ctx.IsSet(OutputBasedir.Name) {
-		if base := ctx.String(OutputBasedir.Name); len(base) > 0 {
-			err := os.MkdirAll(base, 0755) // //rw-r--r--
-			if err != nil {
-				return NewError(ErrorIO, fmt.Errorf("failed creating output basedir: %v", err))
-			}
-			baseDir = base
-		}
+	baseDir, err := createBasedir(ctx)
+	if err != nil {
+		return NewError(ErrorIO, fmt.Errorf("failed creating output basedir: %v", err))
 	}
 	if ctx.Bool(TraceFlag.Name) {
+		if ctx.IsSet(TraceDisableMemoryFlag.Name) && ctx.IsSet(TraceEnableMemoryFlag.Name) {
+			return NewError(ErrorConfig, fmt.Errorf("can't use both flags --%s and --%s", TraceDisableMemoryFlag.Name, TraceEnableMemoryFlag.Name))
+		}
+		if ctx.IsSet(TraceDisableReturnDataFlag.Name) && ctx.IsSet(TraceEnableReturnDataFlag.Name) {
+			return NewError(ErrorConfig, fmt.Errorf("can't use both flags --%s and --%s", TraceDisableReturnDataFlag.Name, TraceEnableReturnDataFlag.Name))
+		}
+		if ctx.IsSet(TraceDisableMemoryFlag.Name) {
+			log.Warn(fmt.Sprintf("--%s has been deprecated in favour of --%s", TraceDisableMemoryFlag.Name, TraceEnableMemoryFlag.Name))
+		}
+		if ctx.IsSet(TraceDisableReturnDataFlag.Name) {
+			log.Warn(fmt.Sprintf("--%s has been deprecated in favour of --%s", TraceDisableReturnDataFlag.Name, TraceEnableReturnDataFlag.Name))
+		}
 		// Configure the EVM logger
-		logConfig := &vm.LogConfig{
-			DisableStack:      ctx.Bool(TraceDisableStackFlag.Name),
-			DisableMemory:     ctx.Bool(TraceDisableMemoryFlag.Name),
-			DisableReturnData: ctx.Bool(TraceDisableReturnDataFlag.Name),
-			Debug:             true,
+		logConfig := &logger.Config{
+			DisableStack:     ctx.Bool(TraceDisableStackFlag.Name),
+			EnableMemory:     !ctx.Bool(TraceDisableMemoryFlag.Name) || ctx.Bool(TraceEnableMemoryFlag.Name),
+			EnableReturnData: !ctx.Bool(TraceDisableReturnDataFlag.Name) || ctx.Bool(TraceEnableReturnDataFlag.Name),
+			Debug:            true,
 		}
 		var prevFile *os.File
 		// This one closes the last file
@@ -111,7 +125,7 @@ func Main(ctx *cli.Context) error {
 				prevFile.Close()
 			}
 		}()
-		getTracer = func(txIndex int, txHash common.Hash) (vm.Tracer, error) {
+		getTracer = func(txIndex int, txHash common.Hash) (vm.EVMLogger, error) {
 			if prevFile != nil {
 				prevFile.Close()
 			}
@@ -120,10 +134,10 @@ func Main(ctx *cli.Context) error {
 				return nil, NewError(ErrorIO, fmt.Errorf("failed creating trace-file: %v", err))
 			}
 			prevFile = traceFile
-			return vm.NewJSONLogger(logConfig, traceFile), nil
+			return logger.NewJSONLogger(logConfig, traceFile), nil
 		}
 	} else {
-		getTracer = func(txIndex int, txHash common.Hash) (tracer vm.Tracer, err error) {
+		getTracer = func(txIndex int, txHash common.Hash) (tracer vm.EVMLogger, err error) {
 			return nil, nil
 		}
 	}
@@ -142,32 +156,22 @@ func Main(ctx *cli.Context) error {
 	// Figure out the prestate alloc
 	if allocStr == stdinSelector || envStr == stdinSelector || txStr == stdinSelector {
 		decoder := json.NewDecoder(os.Stdin)
-		decoder.Decode(inputData)
+		if err := decoder.Decode(inputData); err != nil {
+			return NewError(ErrorJson, fmt.Errorf("failed unmarshaling stdin: %v", err))
+		}
 	}
 	if allocStr != stdinSelector {
-		inFile, err := os.Open(allocStr)
-		if err != nil {
-			return NewError(ErrorIO, fmt.Errorf("failed reading alloc file: %v", err))
-		}
-		defer inFile.Close()
-		decoder := json.NewDecoder(inFile)
-		if err := decoder.Decode(&inputData.Alloc); err != nil {
-			return NewError(ErrorJson, fmt.Errorf("Failed unmarshaling alloc-file: %v", err))
+		if err := readFile(allocStr, "alloc", &inputData.Alloc); err != nil {
+			return err
 		}
 	}
 	prestate.Pre = inputData.Alloc

 	// Set the block environment
 	if envStr != stdinSelector {
-		inFile, err := os.Open(envStr)
-		if err != nil {
-			return NewError(ErrorIO, fmt.Errorf("failed reading env file: %v", err))
-		}
-		defer inFile.Close()
-		decoder := json.NewDecoder(inFile)
 		var env stEnv
-		if err := decoder.Decode(&env); err != nil {
-			return NewError(ErrorJson, fmt.Errorf("Failed unmarshaling env-file: %v", err))
+		if err := readFile(envStr, "env", &env); err != nil {
+			return err
 		}
 		inputData.Env = &env
 	}
@@ -180,7 +184,7 @@ func Main(ctx *cli.Context) error {
 	// Construct the chainconfig
 	var chainConfig *params.ChainConfig
 	if cConf, extraEips, err := tests.GetChainConfig(ctx.String(ForknameFlag.Name)); err != nil {
-		return NewError(ErrorVMConfig, fmt.Errorf("Failed constructing chain configuration: %v", err))
+		return NewError(ErrorConfig, fmt.Errorf("failed constructing chain configuration: %v", err))
 	} else {
 		chainConfig = cConf
 		vmConfig.ExtraEips = extraEips
@@ -196,58 +200,128 @@ func Main(ctx *cli.Context) error {
 		}
 		defer inFile.Close()
 		decoder := json.NewDecoder(inFile)
-		if err := decoder.Decode(&txsWithKeys); err != nil {
-			return NewError(ErrorJson, fmt.Errorf("Failed unmarshaling txs-file: %v", err))
+		if strings.HasSuffix(txStr, ".rlp") {
+			var body hexutil.Bytes
+			if err := decoder.Decode(&body); err != nil {
+				return err
+			}
+			var txs types.Transactions
+			if err := rlp.DecodeBytes(body, &txs); err != nil {
+				return err
+			}
+			for _, tx := range txs {
+				txsWithKeys = append(txsWithKeys, &txWithKey{
+					key: nil,
+					tx:  tx,
+				})
+			}
+		} else {
+			if err := decoder.Decode(&txsWithKeys); err != nil {
+				return NewError(ErrorJson, fmt.Errorf("failed unmarshaling txs-file: %v", err))
+			}
 		}
 	} else {
-		txsWithKeys = inputData.Txs
+		if len(inputData.TxRlp) > 0 {
+			// Decode the body of already signed transactions
+			body := common.FromHex(inputData.TxRlp)
+			var txs types.Transactions
+			if err := rlp.DecodeBytes(body, &txs); err != nil {
+				return err
+			}
+			for _, tx := range txs {
+				txsWithKeys = append(txsWithKeys, &txWithKey{
+					key: nil,
+					tx:  tx,
+				})
+			}
+		} else {
+			// JSON encoded transactions
+			txsWithKeys = inputData.Txs
+		}
 	}
 	// We may have to sign the transactions.
 	signer := types.MakeSigner(chainConfig, big.NewInt(int64(prestate.Env.Number)))

 	if txs, err = signUnsignedTransactions(txsWithKeys, signer); err != nil {
-		return NewError(ErrorJson, fmt.Errorf("Failed signing transactions: %v", err))
+		return NewError(ErrorJson, fmt.Errorf("failed signing transactions: %v", err))
+	}
+	// Sanity check, to not `panic` in state_transition
+	if chainConfig.IsLondon(big.NewInt(int64(prestate.Env.Number))) {
+		if prestate.Env.BaseFee == nil {
+			return NewError(ErrorConfig, errors.New("EIP-1559 config but missing 'currentBaseFee' in env section"))
+		}
+	}
+	isMerged := chainConfig.TerminalTotalDifficulty != nil && chainConfig.TerminalTotalDifficulty.BitLen() == 0
+	env := prestate.Env
+	if isMerged {
+		// post-merge:
+		// - random must be supplied
+		// - difficulty must be zero
+		switch {
+		case env.Random == nil:
+			return NewError(ErrorConfig, errors.New("post-merge requires currentRandom to be defined in env"))
+		case env.Difficulty != nil && env.Difficulty.BitLen() != 0:
+			return NewError(ErrorConfig, errors.New("post-merge difficulty must be zero (or omitted) in env"))
+		}
+		prestate.Env.Difficulty = nil
+	} else if env.Difficulty == nil {
+		// pre-merge:
+		// If difficulty was not provided by caller, we need to calculate it.
+		switch {
+		case env.ParentDifficulty == nil:
+			return NewError(ErrorConfig, errors.New("currentDifficulty was not provided, and cannot be calculated due to missing parentDifficulty"))
+		case env.Number == 0:
+			return NewError(ErrorConfig, errors.New("currentDifficulty needs to be provided for block number 0"))
+		case env.Timestamp <= env.ParentTimestamp:
+			return NewError(ErrorConfig, fmt.Errorf("currentDifficulty cannot be calculated -- currentTime (%d) needs to be after parent time (%d)",
+				env.Timestamp, env.ParentTimestamp))
+		}
+		prestate.Env.Difficulty = calcDifficulty(chainConfig, env.Number, env.Timestamp,
+			env.ParentTimestamp, env.ParentDifficulty, env.ParentUncleHash)
 	}
-
-	// Iterate over all the tests, run them and aggregate the results
-
 	// Run the test and aggregate the result
-	state, result, err := prestate.Apply(vmConfig, chainConfig, txs, ctx.Int64(RewardFlag.Name), getTracer)
+	s, result, err := prestate.Apply(vmConfig, chainConfig, txs, ctx.Int64(RewardFlag.Name), getTracer)
 	if err != nil {
 		return err
 	}
 	body, _ := rlp.EncodeToBytes(txs)
 	// Dump the excution result
 	collector := make(Alloc)
-	state.DumpToCollector(collector, false, false, false, nil, -1)
+	s.DumpToCollector(collector, nil)
 	return dispatchOutput(ctx, baseDir, result, collector, body)
-
 }

 // txWithKey is a helper-struct, to allow us to use the types.Transaction along with
 // a `secretKey`-field, for input
 type txWithKey struct {
-	key *ecdsa.PrivateKey
-	tx  *types.Transaction
+	key       *ecdsa.PrivateKey
+	tx        *types.Transaction
+	protected bool
 }

 func (t *txWithKey) UnmarshalJSON(input []byte) error {
-	// Read the secretKey, if present
-	type sKey struct {
-		Key *common.Hash `json:"secretKey"`
+	// Read the metadata, if present
+	type txMetadata struct {
+		Key       *common.Hash `json:"secretKey"`
+		Protected *bool        `json:"protected"`
 	}
-	var key sKey
-	if err := json.Unmarshal(input, &key); err != nil {
+	var data txMetadata
+	if err := json.Unmarshal(input, &data); err != nil {
 		return err
 	}
-	if key.Key != nil {
-		k := key.Key.Hex()[2:]
+	if data.Key != nil {
+		k := data.Key.Hex()[2:]
 		if ecdsaKey, err := crypto.HexToECDSA(k); err != nil {
 			return err
 		} else {
 			t.key = ecdsaKey
 		}
 	}
+	if data.Protected != nil {
+		t.protected = *data.Protected
+	} else {
+		t.protected = true
+	}
 	// Now, read the transaction itself
 	var tx types.Transaction
 	if err := json.Unmarshal(input, &tx); err != nil {
@@ -276,9 +350,17 @@ func signUnsignedTransactions(txs []*txWithKey, signer types.Signer) (types.Tran
 		v, r, s := tx.RawSignatureValues()
 		if key != nil && v.BitLen()+r.BitLen()+s.BitLen() == 0 {
 			// This transaction needs to be signed
-			signed, err := types.SignTx(tx, signer, key)
+			var (
+				signed *types.Transaction
+				err    error
+			)
+			if txWithKey.protected {
+				signed, err = types.SignTx(tx, signer, key)
+			} else {
+				signed, err = types.SignTx(tx, types.FrontierSigner{}, key)
+			}
 			if err != nil {
-				return nil, NewError(ErrorJson, fmt.Errorf("Tx %d: failed to sign tx: %v", i, err))
+				return nil, NewError(ErrorJson, fmt.Errorf("tx %d: failed to sign tx: %v", i, err))
 			}
 			signedTxs = append(signedTxs, signed)
 		} else {
@@ -303,7 +385,7 @@ func (g Alloc) OnAccount(addr common.Address, dumpAccount state.DumpAccount) {
 		}
 	}
 	genesisAccount := core.GenesisAccount{
-		Code:    common.FromHex(dumpAccount.Code),
+		Code:    dumpAccount.Code,
 		Storage: storage,
 		Balance: balance,
 		Nonce:   dumpAccount.Nonce,
@@ -318,7 +400,7 @@ func saveFile(baseDir, filename string, data interface{}) error {
 		return NewError(ErrorJson, fmt.Errorf("failed marshalling output: %v", err))
 	}
 	location := path.Join(baseDir, filename)
-	if err = ioutil.WriteFile(location, b, 0644); err != nil {
+	if err = os.WriteFile(location, b, 0644); err != nil {
 		return NewError(ErrorIO, fmt.Errorf("failed writing output: %v", err))
 	}
 	log.Info("Wrote file", "file", location)
@@ -355,18 +437,20 @@ func dispatchOutput(ctx *cli.Context, baseDir string, result *ExecutionResult, a
 		return err
 	}
 	if len(stdOutObject) > 0 {
-		b, err := json.MarshalIndent(stdOutObject, "", " ")
+		b, err := json.MarshalIndent(stdOutObject, "", "  ")
 		if err != nil {
 			return NewError(ErrorJson, fmt.Errorf("failed marshalling output: %v", err))
 		}
 		os.Stdout.Write(b)
+		os.Stdout.WriteString("\n")
 	}
 	if len(stdErrObject) > 0 {
-		b, err := json.MarshalIndent(stdErrObject, "", " ")
+		b, err := json.MarshalIndent(stdErrObject, "", "  ")
 		if err != nil {
 			return NewError(ErrorJson, fmt.Errorf("failed marshalling output: %v", err))
 		}
 		os.Stderr.Write(b)
+		os.Stderr.WriteString("\n")
 	}
 	return nil
 }
--- a/cmd/evm/internal/t8ntool/utils.go
+++ b/cmd/evm/internal/t8ntool/utils.go
@@ -0,0 +1,54 @@
+// Copyright 2021 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package t8ntool
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"gopkg.in/urfave/cli.v1"
+)
+
+// readFile reads the json-data in the provided path and marshals into dest.
+func readFile(path, desc string, dest interface{}) error {
+	inFile, err := os.Open(path)
+	if err != nil {
+		return NewError(ErrorIO, fmt.Errorf("failed reading %s file: %v", desc, err))
+	}
+	defer inFile.Close()
+	decoder := json.NewDecoder(inFile)
+	if err := decoder.Decode(dest); err != nil {
+		return NewError(ErrorJson, fmt.Errorf("failed unmarshaling %s file: %v", desc, err))
+	}
+	return nil
+}
+
+// createBasedir makes sure the basedir exists, if user specified one.
+func createBasedir(ctx *cli.Context) (string, error) {
+	baseDir := ""
+	if ctx.IsSet(OutputBasedir.Name) {
+		if base := ctx.String(OutputBasedir.Name); len(base) > 0 {
+			err := os.MkdirAll(base, 0755) // //rw-r--r--
+			if err != nil {
+				return "", err
+			}
+			baseDir = base
+		}
+	}
+	return baseDir, nil
+}
--- a/Show More
+++ b/Show More