params: release geth 1.10.0 stable

tests: update to latest tests (#22290 )
This updates the consensus tests to commit 31d6630 and adds support for access list transactions in the test runner. Co-authored-by: Martin Holst Swende <martin@swende.se>
2021-03-03 17:44:17 +01:00 · 2021-03-03 15:50:07 +01:00 · 2021-03-03 16:08:14 +02:00 · 2021-03-03 15:05:24 +01:00 · 2021-03-03 12:05:27 +02:00 · 2021-03-03 12:04:50 +02:00
647 changed files with 48064 additions and 22150 deletions
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -30,11 +30,11 @@ Please make sure your contributions adhere to our coding guidelines:
 Before you submit a feature request, please check and make sure that it isn't 
 possible through some other means. The JavaScript-enabled console is a powerful 
 feature in the right hands. Please check our 
-[Wiki page](https://github.com/ethereum/go-ethereum/wiki) for more info
+[Geth documentation page](https://geth.ethereum.org/docs/) for more info
 and help.

 ## Configuration, dependencies, and tests

-Please see the [Developers' Guide](https://github.com/ethereum/go-ethereum/wiki/Developers'-Guide)
+Please see the [Developers' Guide](https://geth.ethereum.org/docs/developers/devguide)
 for more details on configuring your environment, managing project dependencies
 and testing procedures.
--- a/.github/ISSUE_TEMPLATE/bug.md
+++ b/.github/ISSUE_TEMPLATE/bug.md
@@ -1,8 +1,10 @@
-Hi there,
-
-Please note that this is an issue tracker reserved for bug reports and feature requests.
-
-For general questions please use [discord](https://discord.gg/nthXNEv) or the Ethereum stack exchange at https://ethereum.stackexchange.com.
+---
+name: Report a bug
+about: Something with go-ethereum is not working as expected
+title: ''
+labels: 'type:bug'
+assignees: ''
+---

 #### System information

--- a/.github/ISSUE_TEMPLATE/feature.md
+++ b/.github/ISSUE_TEMPLATE/feature.md
@@ -0,0 +1,17 @@
+---
+name: Request a feature
+about: Report a missing feature - e.g. as a step before submitting a PR
+title: ''
+labels: 'type:feature'
+assignees: ''
+---
+
+# Rationale
+
+Why should this feature exist?
+What are the use-cases?
+
+# Implementation
+
+Do you have ideas regarding the implementation of this feature?
+Are you willing to implement this feature?
--- a/.github/ISSUE_TEMPLATE/question.md
+++ b/.github/ISSUE_TEMPLATE/question.md
@@ -0,0 +1,9 @@
+---
+name: Ask a question
+about: Something is unclear
+title: ''
+labels: 'type:docs'
+assignees: ''
+---
+
+This should only be used in very rare cases e.g. if you are not 100% sure if something is a bug or asking a question that leads to improving the documentation. For general questions please use [discord](https://discord.gg/nthXNEv) or the Ethereum stack exchange at https://ethereum.stackexchange.com.
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ jobs:
  allow_failures:
    - stage: build
      os: osx
-      go: 1.14.x
+      go: 1.15.x
      env:
        - azure-osx
        - azure-ios
@@ -15,8 +15,8 @@ jobs:
    # This builder only tests code linters on latest version of Go
    - stage: lint
      os: linux
-      dist: xenial
-      go: 1.15.x
+      dist: bionic
+      go: 1.16.x
      env:
        - lint
      git:
@@ -24,75 +24,12 @@ jobs:
      script:
        - go run build/ci.go lint

-    - stage: build
-      os: linux
-      dist: xenial
-      go: 1.13.x
-      env:
-        - GO111MODULE=on
-      script:
-        - go run build/ci.go install
-        - go run build/ci.go test -coverage $TEST_PACKAGES
-
-    - stage: build
-      os: linux
-      dist: xenial
-      go: 1.14.x
-      env:
-        - GO111MODULE=on
-      script:
-        - go run build/ci.go install
-        - go run build/ci.go test -coverage $TEST_PACKAGES
-
-    # These are the latest Go versions.
-    - stage: build
-      os: linux
-      arch: amd64
-      dist: xenial
-      go: 1.15.x
-      env:
-        - GO111MODULE=on
-      script:
-        - go run build/ci.go install
-        - go run build/ci.go test -coverage $TEST_PACKAGES
-
-    - stage: build
-      if: type = pull_request
-      os: linux
-      arch: arm64
-      dist: xenial
-      go: 1.15.x
-      env:
-        - GO111MODULE=on
-      script:
-        - go run build/ci.go install
-        - go run build/ci.go test -coverage $TEST_PACKAGES
-
-    - stage: build
-      os: osx
-      osx_image: xcode11.3
-      go: 1.15.x
-      env:
-        - GO111MODULE=on
-      script:
-        - echo "Increase the maximum number of open file descriptors on macOS"
-        - NOFILE=20480
-        - sudo sysctl -w kern.maxfiles=$NOFILE
-        - sudo sysctl -w kern.maxfilesperproc=$NOFILE
-        - sudo launchctl limit maxfiles $NOFILE $NOFILE
-        - sudo launchctl limit maxfiles
-        - ulimit -S -n $NOFILE
-        - ulimit -n
-        - unset -f cd # workaround for https://github.com/travis-ci/travis-ci/issues/8703
-        - go run build/ci.go install
-        - go run build/ci.go test -coverage $TEST_PACKAGES
-
    # This builder does the Ubuntu PPA upload
    - stage: build
      if: type = push
      os: linux
-      dist: xenial
-      go: 1.15.x
+      dist: bionic
+      go: 1.16.x
      env:
        - ubuntu-ppa
        - GO111MODULE=on
@@ -109,15 +46,15 @@ jobs:
            - python-paramiko
      script:
        - echo '|1|7SiYPr9xl3uctzovOTj4gMwAC1M=|t6ReES75Bo/PxlOPJ6/GsGbTrM0= ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA0aKz5UTUndYgIGG7dQBV+HaeuEZJ2xPHo2DS2iSKvUL4xNMSAY4UguNW+pX56nAQmZKIZZ8MaEvSj6zMEDiq6HFfn5JcTlM80UwlnyKe8B8p7Nk06PPQLrnmQt5fh0HmEcZx+JU9TZsfCHPnX7MNz4ELfZE6cFsclClrKim3BHUIGq//t93DllB+h4O9LHjEUsQ1Sr63irDLSutkLJD6RXchjROXkNirlcNVHH/jwLWR5RcYilNX7S5bIkK8NlWPjsn/8Ua5O7I9/YoE97PpO6i73DTGLh5H9JN/SITwCKBkgSDWUt61uPK3Y11Gty7o2lWsBjhBUm2Y38CBsoGmBw==' >> ~/.ssh/known_hosts
-        - go run build/ci.go debsrc -goversion 1.15 -upload ethereum/ethereum -sftp-user geth-ci -signer "Go Ethereum Linux Builder <geth-ci@ethereum.org>"
+        - go run build/ci.go debsrc -upload ethereum/ethereum -sftp-user geth-ci -signer "Go Ethereum Linux Builder <geth-ci@ethereum.org>"

    # This builder does the Linux Azure uploads
    - stage: build
      if: type = push
      os: linux
-      dist: xenial
+      dist: bionic
      sudo: required
-      go: 1.15.x
+      go: 1.16.x
      env:
        - azure-linux
        - GO111MODULE=on
@@ -129,32 +66,32 @@ jobs:
            - gcc-multilib
      script:
        # Build for the primary platforms that Trusty can manage
-        - go run build/ci.go install
-        - go run build/ci.go archive -type tar -signer LINUX_SIGNING_KEY -upload gethstore/builds
-        - go run build/ci.go install -arch 386
-        - go run build/ci.go archive -arch 386 -type tar -signer LINUX_SIGNING_KEY -upload gethstore/builds
+        - go run build/ci.go install -dlgo
+        - go run build/ci.go archive -type tar -signer LINUX_SIGNING_KEY -signify SIGNIFY_KEY -upload gethstore/builds
+        - go run build/ci.go install -dlgo -arch 386
+        - go run build/ci.go archive -arch 386 -type tar -signer LINUX_SIGNING_KEY -signify SIGNIFY_KEY -upload gethstore/builds

        # Switch over GCC to cross compilation (breaks 386, hence why do it here only)
        - sudo -E apt-get -yq --no-install-suggests --no-install-recommends --force-yes install gcc-arm-linux-gnueabi libc6-dev-armel-cross gcc-arm-linux-gnueabihf libc6-dev-armhf-cross gcc-aarch64-linux-gnu libc6-dev-arm64-cross
        - sudo ln -s /usr/include/asm-generic /usr/include/asm

-        - GOARM=5 go run build/ci.go install -arch arm -cc arm-linux-gnueabi-gcc
-        - GOARM=5 go run build/ci.go archive -arch arm -type tar -signer LINUX_SIGNING_KEY -upload gethstore/builds
-        - GOARM=6 go run build/ci.go install -arch arm -cc arm-linux-gnueabi-gcc
-        - GOARM=6 go run build/ci.go archive -arch arm -type tar -signer LINUX_SIGNING_KEY -upload gethstore/builds
-        - GOARM=7 go run build/ci.go install -arch arm -cc arm-linux-gnueabihf-gcc
-        - GOARM=7 go run build/ci.go archive -arch arm -type tar -signer LINUX_SIGNING_KEY -upload gethstore/builds
-        - go run build/ci.go install -arch arm64 -cc aarch64-linux-gnu-gcc
-        - go run build/ci.go archive -arch arm64 -type tar -signer LINUX_SIGNING_KEY -upload gethstore/builds
+        - GOARM=5 go run build/ci.go install -dlgo -arch arm -cc arm-linux-gnueabi-gcc
+        - GOARM=5 go run build/ci.go archive -arch arm -type tar -signer LINUX_SIGNING_KEY -signify SIGNIFY_KEY -upload gethstore/builds
+        - GOARM=6 go run build/ci.go install -dlgo -arch arm -cc arm-linux-gnueabi-gcc
+        - GOARM=6 go run build/ci.go archive -arch arm -type tar -signer LINUX_SIGNING_KEY -signify SIGNIFY_KEY -upload gethstore/builds
+        - GOARM=7 go run build/ci.go install -dlgo -arch arm -cc arm-linux-gnueabihf-gcc
+        - GOARM=7 go run build/ci.go archive -arch arm -type tar -signer LINUX_SIGNING_KEY -signify SIGNIFY_KEY -upload gethstore/builds
+        - 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: xenial
+      dist: bionic
      services:
        - docker
-      go: 1.15.x
+      go: 1.16.x
      env:
        - azure-linux-mips
        - GO111MODULE=on
@@ -163,38 +100,29 @@ jobs:
      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 -upload gethstore/builds
+        - 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 -upload gethstore/builds
+        - 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 -upload gethstore/builds
+        - 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 -upload gethstore/builds
+        - 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
      os: linux
-      dist: xenial
+      dist: bionic
      addons:
        apt:
          packages:
-            - oracle-java8-installer
-            - oracle-java8-set-default
-      language: android
-      android:
-        components:
-          - platform-tools
-          - tools
-          - android-15
-          - android-19
-          - android-24
+            - openjdk-8-jdk
      env:
        - azure-android
        - maven-android
@@ -202,25 +130,33 @@ jobs:
      git:
        submodules: false # avoid cloning ethereum/tests
      before_install:
-        - curl https://dl.google.com/go/go1.15.linux-amd64.tar.gz | tar -xz
+        # Install Android and it's dependencies manually, Travis is stale
+        - export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
+        - curl https://dl.google.com/android/repository/commandlinetools-linux-6858069_latest.zip -o android.zip
+        - unzip -q android.zip -d $HOME/sdk && rm android.zip
+        - mv $HOME/sdk/cmdline-tools $HOME/sdk/latest && mkdir $HOME/sdk/cmdline-tools && mv $HOME/sdk/latest $HOME/sdk/cmdline-tools
+        - export PATH=$PATH:$HOME/sdk/cmdline-tools/latest/bin
+        - export ANDROID_HOME=$HOME/sdk
+
+        - yes | sdkmanager --licenses >/dev/null
+        - 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
        - export PATH=`pwd`/go/bin:$PATH
        - export GOROOT=`pwd`/go
        - export GOPATH=$HOME/go
      script:
        # Build the Android archive and upload it to Maven Central and Azure
-        - curl https://dl.google.com/android/repository/android-ndk-r19b-linux-x86_64.zip -o android-ndk-r19b.zip
-        - unzip -q android-ndk-r19b.zip && rm android-ndk-r19b.zip
-        - mv android-ndk-r19b $ANDROID_HOME/ndk-bundle
-
        - mkdir -p $GOPATH/src/github.com/ethereum
        - ln -s `pwd` $GOPATH/src/github.com/ethereum/go-ethereum
-        - go run build/ci.go aar -signer ANDROID_SIGNING_KEY -deploy https://oss.sonatype.org -upload gethstore/builds
+        - go run build/ci.go aar -signer ANDROID_SIGNING_KEY -signify SIGNIFY_KEY  -deploy https://oss.sonatype.org -upload gethstore/builds

    # This builder does the OSX Azure, iOS CocoaPods and iOS Azure uploads
    - stage: build
      if: type = push
      os: osx
-      go: 1.15.x
+      go: 1.16.x
      env:
        - azure-osx
        - azure-ios
@@ -229,8 +165,8 @@ jobs:
      git:
        submodules: false # avoid cloning ethereum/tests
      script:
-        - go run build/ci.go install
-        - go run build/ci.go archive -type tar -signer OSX_SIGNING_KEY -upload gethstore/builds
+        - go run build/ci.go install -dlgo
+        - go run build/ci.go archive -type tar -signer OSX_SIGNING_KEY -signify SIGNIFY_KEY -upload gethstore/builds

        # Build the iOS framework and upload it to CocoaPods and Azure
        - gem uninstall cocoapods -a -x
@@ -245,14 +181,45 @@ jobs:

        # Workaround for https://github.com/golang/go/issues/23749
        - export CGO_CFLAGS_ALLOW='-fmodules|-fblocks|-fobjc-arc'
-        - go run build/ci.go xcode -signer IOS_SIGNING_KEY -deploy trunk -upload gethstore/builds
+        - go run build/ci.go xcode -signer IOS_SIGNING_KEY -signify SIGNIFY_KEY -deploy trunk -upload gethstore/builds
+
+    # These builders run the tests
+    - stage: build
+      os: linux
+      arch: amd64
+      dist: bionic
+      go: 1.16.x
+      env:
+        - GO111MODULE=on
+      script:
+        - go run build/ci.go test -coverage $TEST_PACKAGES
+
+    - stage: build
+      if: type = pull_request
+      os: linux
+      arch: arm64
+      dist: bionic
+      go: 1.16.x
+      env:
+        - GO111MODULE=on
+      script:
+        - go run build/ci.go test -coverage $TEST_PACKAGES
+
+    - stage: build
+      os: linux
+      dist: bionic
+      go: 1.15.x
+      env:
+        - GO111MODULE=on
+      script:
+        - go run build/ci.go test -coverage $TEST_PACKAGES

    # This builder does the Azure archive purges to avoid accumulating junk
    - stage: build
      if: type = cron
      os: linux
-      dist: xenial
-      go: 1.15.x
+      dist: bionic
+      go: 1.16.x
      env:
        - azure-purge
        - GO111MODULE=on
--- a/59
+++ b/59
@@ -1,7 +1,7 @@
                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

- Copyright (C) 2014 The go-ethereum Authors.
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

@@ -616,4 +616,59 @@ above cannot be given local legal effect according to their terms,
 reviewing courts shall apply local law that most closely approximates
 an absolute waiver of all civil liability in connection with the
 Program, unless a warranty or assumption of liability accompanies a
-copy of the Program in return for a fee.
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program 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.
+
+    This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
--- a/4
+++ b/4
@@ -1,5 +1,5 @@
 # Build Geth in a stock Go builder container
-FROM golang:1.15-alpine as builder
+FROM golang:1.16-alpine as builder

 RUN apk add --no-cache make gcc musl-dev linux-headers git

@@ -12,5 +12,5 @@ FROM alpine:latest
 RUN apk add --no-cache ca-certificates
 COPY --from=builder /go-ethereum/build/bin/geth /usr/local/bin/

-EXPOSE 8545 8546 8547 30303 30303/udp
+EXPOSE 8545 8546 30303 30303/udp
 ENTRYPOINT ["geth"]
--- a/Dockerfile.alltools
+++ b/Dockerfile.alltools
@@ -1,5 +1,5 @@
 # Build Geth in a stock Go builder container
-FROM golang:1.15-alpine as builder
+FROM golang:1.16-alpine as builder

 RUN apk add --no-cache make gcc musl-dev linux-headers git

@@ -12,4 +12,4 @@ FROM alpine:latest
 RUN apk add --no-cache ca-certificates
 COPY --from=builder /go-ethereum/build/bin/* /usr/local/bin/

-EXPOSE 8545 8546 8547 30303 30303/udp
+EXPOSE 8545 8546 30303 30303/udp
--- a/4
+++ b/4
@@ -24,7 +24,9 @@ android:
 	$(GORUN) build/ci.go aar --local
 	@echo "Done building."
 	@echo "Import \"$(GOBIN)/geth.aar\" to use the library."
-
+	@echo "Import \"$(GOBIN)/geth-sources.jar\" to add javadocs"
+	@echo "For more info see https://stackoverflow.com/questions/20994336/android-studio-how-to-attach-javadoc"
+	
 ios:
 	$(GORUN) build/ci.go xcode --local
 	@echo "Done building."
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Official Golang implementation of the Ethereum protocol.
 https://camo.githubusercontent.com/915b7be44ada53c290eb157634330494ebe3e30a/68747470733a2f2f676f646f632e6f72672f6769746875622e636f6d2f676f6c616e672f6764646f3f7374617475732e737667
 )](https://pkg.go.dev/github.com/ethereum/go-ethereum?tab=doc)
 [![Go Report Card](https://goreportcard.com/badge/github.com/ethereum/go-ethereum)](https://goreportcard.com/report/github.com/ethereum/go-ethereum)
-[![Travis](https://travis-ci.org/ethereum/go-ethereum.svg?branch=master)](https://travis-ci.org/ethereum/go-ethereum)
+[![Travis](https://travis-ci.com/ethereum/go-ethereum.svg?branch=master)](https://travis-ci.com/ethereum/go-ethereum)
 [![Discord](https://img.shields.io/badge/discord-join%20chat-blue.svg)](https://discord.gg/nthXNEv)

 Automated builds are available for stable releases and the unstable master branch. Binary
@@ -14,7 +14,7 @@ archives are published at https://geth.ethereum.org/downloads/.

 ## Building the source

-For prerequisites and detailed build instructions please read the [Installation Instructions](https://github.com/ethereum/go-ethereum/wiki/Building-Ethereum) on the wiki.
+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 1.13 or later) and a C compiler. You can install
 them using your favourite package manager. Once the dependencies are installed, run
@@ -36,18 +36,18 @@ directory.

 |    Command    | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
 | :-----------: | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-|  **`geth`**   | Our main Ethereum CLI client. It is the entry point into the Ethereum network (main-, test- or private net), capable of running as a full node (default), archive node (retaining all historical state) or a light node (retrieving data live). It can be used by other processes as a gateway into the Ethereum network via JSON RPC endpoints exposed on top of HTTP, WebSocket and/or IPC transports. `geth --help` and the [CLI Wiki page](https://github.com/ethereum/go-ethereum/wiki/Command-Line-Options) for command line options.          |
-|   `abigen`    | Source code generator to convert Ethereum contract definitions into easy to use, compile-time type-safe Go packages. It operates on plain [Ethereum contract ABIs](https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI) with expanded functionality if the contract bytecode is also available. However, it also accepts Solidity source files, making development much more streamlined. Please see our [Native DApps](https://github.com/ethereum/go-ethereum/wiki/Native-DApps:-Go-bindings-to-Ethereum-contracts) wiki page for details. |
+|  **`geth`**   | Our main Ethereum CLI client. It is the entry point into the Ethereum network (main-, test- or private net), capable of running as a full node (default), archive node (retaining all historical state) or a light node (retrieving data live). It can be used by other processes as a gateway into the Ethereum network via JSON RPC endpoints exposed on top of HTTP, WebSocket and/or IPC transports. `geth --help` and the [CLI page](https://geth.ethereum.org/docs/interface/command-line-options) for command line options.          |
+|   `abigen`    | Source code generator to convert Ethereum contract definitions into easy to use, compile-time type-safe Go packages. It operates on plain [Ethereum contract ABIs](https://docs.soliditylang.org/en/develop/abi-spec.html) with expanded functionality if the contract bytecode is also available. However, it also accepts Solidity source files, making development much more streamlined. Please see our [Native DApps](https://geth.ethereum.org/docs/dapp/native-bindings) page for details. |
 |  `bootnode`   | Stripped down version of our Ethereum client implementation that only takes part in the network node discovery protocol, but does not run any of the higher level application protocols. It can be used as a lightweight bootstrap node to aid in finding peers in private networks.                                                                                                                                                                                                                                                                 |
 |     `evm`     | Developer utility version of the EVM (Ethereum Virtual Machine) that is capable of running bytecode snippets within a configurable environment and execution mode. Its purpose is to allow isolated, fine-grained debugging of EVM opcodes (e.g. `evm --code 60ff60ff --debug run`).                                                                                                                                                                                                                                                                     |
-| `gethrpctest` | Developer utility tool to support our [ethereum/rpc-test](https://github.com/ethereum/rpc-tests) test suite which validates baseline conformity to the [Ethereum JSON RPC](https://github.com/ethereum/wiki/wiki/JSON-RPC) specs. Please see the [test suite's readme](https://github.com/ethereum/rpc-tests/blob/master/README.md) for details.                                                                                                                                                                                                     |
-|   `rlpdump`   | Developer utility tool to convert binary RLP ([Recursive Length Prefix](https://github.com/ethereum/wiki/wiki/RLP)) dumps (data encoding used by the Ethereum protocol both network as well as consensus wise) to user-friendlier hierarchical representation (e.g. `rlpdump --hex CE0183FFFFFFC4C304050583616263`).                                                                                                                                                                                                                                 |
+| `gethrpctest` | Developer utility tool to support our [ethereum/rpc-test](https://github.com/ethereum/rpc-tests) test suite which validates baseline conformity to the [Ethereum JSON RPC](https://eth.wiki/json-rpc/API) specs. Please see the [test suite's readme](https://github.com/ethereum/rpc-tests/blob/master/README.md) for details.                                                                                                                                                                                                     |
+|   `rlpdump`   | Developer utility tool to convert binary RLP ([Recursive Length Prefix](https://eth.wiki/en/fundamentals/rlp)) dumps (data encoding used by the Ethereum protocol both network as well as consensus wise) to user-friendlier hierarchical representation (e.g. `rlpdump --hex CE0183FFFFFFC4C304050583616263`).                                                                                                                                                                                                                                 |
 |   `puppeth`   | a CLI wizard that aids in creating a new Ethereum network.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |

 ## Running `geth`

 Going through all the possible command line flags is out of scope here (please consult our
-[CLI Wiki page](https://github.com/ethereum/go-ethereum/wiki/Command-Line-Options)),
+[CLI Wiki page](https://geth.ethereum.org/docs/interface/command-line-options)),
 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.

@@ -66,9 +66,9 @@ This command will:
 * Start `geth` in fast 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://github.com/ethereum/go-ethereum/wiki/JavaScript-Console),
-   (via the trailing `console` subcommand) through which you can invoke all official [`web3` methods](https://github.com/ethereum/wiki/wiki/JavaScript-API)
-   as well as `geth`'s own [management APIs](https://github.com/ethereum/go-ethereum/wiki/Management-APIs).
+ * 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 invoke all official [`web3` methods](https://web3js.readthedocs.io/en/)
+   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
   `geth` instance with `geth attach`.

@@ -170,8 +170,8 @@ accessible from the outside.

 As a developer, sooner rather than later you'll want to start interacting with `geth` and the
 Ethereum network via your own programs and not manually through the console. To aid
-this, `geth` has built-in support for a JSON-RPC based APIs ([standard APIs](https://github.com/ethereum/wiki/wiki/JSON-RPC)
-and [`geth` specific APIs](https://github.com/ethereum/go-ethereum/wiki/Management-APIs)).
+this, `geth` has built-in support for a JSON-RPC based APIs ([standard APIs](https://eth.wiki/json-rpc/API)
+and [`geth` specific APIs](https://geth.ethereum.org/docs/rpc/server)).
 These can be exposed via HTTP, WebSockets and IPC (UNIX sockets on UNIX based
 platforms, and named pipes on Windows).

@@ -277,7 +277,7 @@ $ bootnode --genkey=boot.key
 $ bootnode --nodekey=boot.key
 ```

-With the bootnode online, it will display an [`enode` URL](https://github.com/ethereum/wiki/wiki/enode-url-format)
+With the bootnode online, it will display an [`enode` URL](https://eth.wiki/en/fundamentals/enode-url-format)
 that other nodes can use to connect to it and exchange peer information. Make sure to
 replace the displayed IP address information (most probably `[::]`) with your externally
 accessible IP to get the actual `enode` URL.
@@ -314,13 +314,13 @@ ones either). To start a `geth` instance for mining, run it with all your usual
 by:

 ```shell
-$ geth <usual-flags> --mine --miner.threads=1 --etherbase=0x0000000000000000000000000000000000000000
+$ geth <usual-flags> --mine --miner.threads=1 --miner.etherbase=0x0000000000000000000000000000000000000000
 ```

 Which will start mining blocks and transactions on a single CPU thread, crediting all
-proceedings to the account specified by `--etherbase`. You can further tune the mining
-by changing the default gas limit blocks converge to (`--targetgaslimit`) and the price
-transactions are accepted at (`--gasprice`).
+proceedings to the account specified by `--miner.etherbase`. You can further tune the mining
+by changing the default gas limit blocks converge to (`--miner.targetgaslimit`) and the price
+transactions are accepted at (`--miner.gasprice`).

 ## Contribution

@@ -344,7 +344,7 @@ Please make sure your contributions adhere to our coding guidelines:
 * Commit messages should be prefixed with the package(s) they modify.
   * E.g. "eth, rpc: make trace configs optional"

-Please see the [Developers' Guide](https://github.com/ethereum/go-ethereum/wiki/Developers'-Guide)
+Please see the [Developers' Guide](https://geth.ethereum.org/docs/developers/devguide)
 for more details on configuring your environment, managing project dependencies, and
 testing procedures.

--- a/SECURITY.md
+++ b/SECURITY.md
@@ -2,31 +2,29 @@

 ## Supported Versions

-Please see Releases. We recommend to use the most recent released version.  
+Please see [Releases](https://github.com/ethereum/go-ethereum/releases). We recommend using the [most recently released version](https://github.com/ethereum/go-ethereum/releases/latest).

 ## Audit reports

 Audit reports are published in the `docs` folder: https://github.com/ethereum/go-ethereum/tree/master/docs/audits 

-
 | Scope | Date | Report Link |
 | ------- | ------- | ----------- |
 | `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) |

-
-
 ## 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.
+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.
+
+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.

 The following key may be used to communicate sensitive information to developers.

 Fingerprint: `AE96 ED96 9E47 9B00 84F3 E17F E88D 3334 FA5F 6A0A`

-
 ```
 -----BEGIN PGP PUBLIC KEY BLOCK-----
 Version: GnuPG v1
--- a/accounts/abi/abi.go
+++ b/accounts/abi/abi.go
@@ -80,39 +80,59 @@ func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) {
 	return append(method.ID, arguments...), nil
 }

-// Unpack output in v according to the abi specification
-func (abi ABI) Unpack(v interface{}, name string, data []byte) (err error) {
+func (abi ABI) getArguments(name string, data []byte) (Arguments, error) {
 	// since there can't be naming collisions with contracts and events,
 	// we need to decide whether we're calling a method or an event
+	var args Arguments
 	if method, ok := abi.Methods[name]; ok {
 		if len(data)%32 != 0 {
-			return fmt.Errorf("abi: improperly formatted output: %s - Bytes: [%+v]", string(data), data)
+			return nil, fmt.Errorf("abi: improperly formatted output: %s - Bytes: [%+v]", string(data), data)
 		}
-		return method.Outputs.Unpack(v, data)
+		args = method.Outputs
 	}
 	if event, ok := abi.Events[name]; ok {
-		return event.Inputs.Unpack(v, data)
+		args = event.Inputs
 	}
-	return fmt.Errorf("abi: could not locate named method or event")
+	if args == nil {
+		return nil, errors.New("abi: could not locate named method or event")
+	}
+	return args, nil
 }

-// UnpackIntoMap unpacks a log into the provided map[string]interface{}
+// Unpack unpacks the output according to the abi specification.
+func (abi ABI) Unpack(name string, data []byte) ([]interface{}, error) {
+	args, err := abi.getArguments(name, data)
+	if err != nil {
+		return nil, err
+	}
+	return args.Unpack(data)
+}
+
+// UnpackIntoInterface unpacks the output in v according to the abi specification.
+// It performs an additional copy. Please only use, if you want to unpack into a
+// structure that does not strictly conform to the abi structure (e.g. has additional arguments)
+func (abi ABI) UnpackIntoInterface(v interface{}, name string, data []byte) error {
+	args, err := abi.getArguments(name, data)
+	if err != nil {
+		return err
+	}
+	unpacked, err := args.Unpack(data)
+	if err != nil {
+		return err
+	}
+	return args.Copy(v, unpacked)
+}
+
+// UnpackIntoMap unpacks a log into the provided map[string]interface{}.
 func (abi ABI) UnpackIntoMap(v map[string]interface{}, name string, data []byte) (err error) {
-	// since there can't be naming collisions with contracts and events,
-	// we need to decide whether we're calling a method or an event
-	if method, ok := abi.Methods[name]; ok {
-		if len(data)%32 != 0 {
-			return fmt.Errorf("abi: improperly formatted output")
-		}
-		return method.Outputs.UnpackIntoMap(v, data)
+	args, err := abi.getArguments(name, data)
+	if err != nil {
+		return err
 	}
-	if event, ok := abi.Events[name]; ok {
-		return event.Inputs.UnpackIntoMap(v, data)
-	}
-	return fmt.Errorf("abi: could not locate named method or event")
+	return args.UnpackIntoMap(v, data)
 }

-// UnmarshalJSON implements json.Unmarshaler interface
+// UnmarshalJSON implements json.Unmarshaler interface.
 func (abi *ABI) UnmarshalJSON(data []byte) error {
 	var fields []struct {
 		Type    string
@@ -201,8 +221,8 @@ func (abi *ABI) overloadedEventName(rawName string) string {
 	return name
 }

-// MethodById looks up a method by the 4-byte id
-// returns nil if none found
+// MethodById looks up a method by the 4-byte id,
+// returns nil if none found.
 func (abi *ABI) MethodById(sigdata []byte) (*Method, error) {
 	if len(sigdata) < 4 {
 		return nil, fmt.Errorf("data too short (%d bytes) for abi method lookup", len(sigdata))
@@ -250,10 +270,10 @@ func UnpackRevert(data []byte) (string, error) {
 	if !bytes.Equal(data[:4], revertSelector) {
 		return "", errors.New("invalid data for unpacking")
 	}
-	var reason string
 	typ, _ := NewType("string", "", nil)
-	if err := (Arguments{{Type: typ}}).Unpack(&reason, data[4:]); err != nil {
+	unpacked, err := (Arguments{{Type: typ}}).Unpack(data[4:])
+	if err != nil {
 		return "", err
 	}
-	return reason, nil
+	return unpacked[0].(string), nil
 }
--- a/accounts/abi/abi_test.go
+++ b/accounts/abi/abi_test.go
@@ -33,7 +33,7 @@ import (

 const jsondata = `
 [
-	{ "type" : "function", "name" : "", "stateMutability" : "view" },
+	{ "type" : "function", "name" : ""},
 	{ "type" : "function", "name" : "balance", "stateMutability" : "view" },
 	{ "type" : "function", "name" : "send", "inputs" : [ { "name" : "amount", "type" : "uint256" } ] },
 	{ "type" : "function", "name" : "test", "inputs" : [ { "name" : "number", "type" : "uint32" } ] },
@@ -43,6 +43,7 @@ const jsondata = `
 	{ "type" : "function", "name" : "uint64[2]", "inputs" : [ { "name" : "inputs", "type" : "uint64[2]" } ] },
 	{ "type" : "function", "name" : "uint64[]", "inputs" : [ { "name" : "inputs", "type" : "uint64[]" } ] },
 	{ "type" : "function", "name" : "int8", "inputs" : [ { "name" : "inputs", "type" : "int8" } ] },
+	{ "type" : "function", "name" : "bytes32", "inputs" : [ { "name" : "inputs", "type" : "bytes32" } ] },
 	{ "type" : "function", "name" : "foo", "inputs" : [ { "name" : "inputs", "type" : "uint32" } ] },
 	{ "type" : "function", "name" : "bar", "inputs" : [ { "name" : "inputs", "type" : "uint32" }, { "name" : "string", "type" : "uint16" } ] },
 	{ "type" : "function", "name" : "slice", "inputs" : [ { "name" : "inputs", "type" : "uint32[2]" } ] },
@@ -68,6 +69,7 @@ var (
 	String, _     = NewType("string", "", nil)
 	Bool, _       = NewType("bool", "", nil)
 	Bytes, _      = NewType("bytes", "", nil)
+	Bytes32, _    = NewType("bytes32", "", nil)
 	Address, _    = NewType("address", "", nil)
 	Uint64Arr, _  = NewType("uint64[]", "", nil)
 	AddressArr, _ = NewType("address[]", "", nil)
@@ -88,7 +90,7 @@ var (
 )

 var methods = map[string]Method{
-	"":                    NewMethod("", "", Function, "view", false, false, nil, nil),
+	"":                    NewMethod("", "", Function, "", false, false, nil, nil),
 	"balance":             NewMethod("balance", "balance", Function, "view", false, false, nil, nil),
 	"send":                NewMethod("send", "send", Function, "", false, false, []Argument{{"amount", Uint256, false}}, nil),
 	"test":                NewMethod("test", "test", Function, "", false, false, []Argument{{"number", Uint32, false}}, nil),
@@ -98,6 +100,7 @@ var methods = map[string]Method{
 	"uint64[]":            NewMethod("uint64[]", "uint64[]", Function, "", false, false, []Argument{{"inputs", Uint64Arr, false}}, nil),
 	"uint64[2]":           NewMethod("uint64[2]", "uint64[2]", Function, "", false, false, []Argument{{"inputs", Uint64Arr2, false}}, nil),
 	"int8":                NewMethod("int8", "int8", Function, "", false, false, []Argument{{"inputs", Int8, false}}, nil),
+	"bytes32":             NewMethod("bytes32", "bytes32", Function, "", false, false, []Argument{{"inputs", Bytes32, false}}, nil),
 	"foo":                 NewMethod("foo", "foo", Function, "", false, false, []Argument{{"inputs", Uint32, false}}, nil),
 	"bar":                 NewMethod("bar", "bar", Function, "", false, false, []Argument{{"inputs", Uint32, false}, {"string", Uint16, false}}, nil),
 	"slice":               NewMethod("slice", "slice", Function, "", false, false, []Argument{{"inputs", Uint32Arr2, false}}, nil),
@@ -181,18 +184,15 @@ func TestConstructor(t *testing.T) {
 	if err != nil {
 		t.Error(err)
 	}
-	v := struct {
-		A *big.Int
-		B *big.Int
-	}{new(big.Int), new(big.Int)}
-	//abi.Unpack(&v, "", packed)
-	if err := abi.Constructor.Inputs.Unpack(&v, packed); err != nil {
+	unpacked, err := abi.Constructor.Inputs.Unpack(packed)
+	if err != nil {
 		t.Error(err)
 	}
-	if !reflect.DeepEqual(v.A, big.NewInt(1)) {
+
+	if !reflect.DeepEqual(unpacked[0], big.NewInt(1)) {
 		t.Error("Unable to pack/unpack from constructor")
 	}
-	if !reflect.DeepEqual(v.B, big.NewInt(2)) {
+	if !reflect.DeepEqual(unpacked[1], big.NewInt(2)) {
 		t.Error("Unable to pack/unpack from constructor")
 	}
 }
@@ -743,7 +743,7 @@ func TestUnpackEvent(t *testing.T) {
 	}
 	var ev ReceivedEvent

-	err = abi.Unpack(&ev, "received", data)
+	err = abi.UnpackIntoInterface(&ev, "received", data)
 	if err != nil {
 		t.Error(err)
 	}
@@ -752,7 +752,7 @@ func TestUnpackEvent(t *testing.T) {
 		Sender common.Address
 	}
 	var receivedAddrEv ReceivedAddrEvent
-	err = abi.Unpack(&receivedAddrEv, "receivedAddr", data)
+	err = abi.UnpackIntoInterface(&receivedAddrEv, "receivedAddr", data)
 	if err != nil {
 		t.Error(err)
 	}
@@ -1092,7 +1092,7 @@ func TestDoubleDuplicateEventNames(t *testing.T) {
 }

 // TestUnnamedEventParam checks that an event with unnamed parameters is
-// correctly handled
+// correctly handled.
 // The test runs the abi of the following contract.
 // 	contract TestEvent {
 //		event send(uint256, uint256);
--- a/accounts/abi/argument.go
+++ b/accounts/abi/argument.go
@@ -41,7 +41,7 @@ type ArgumentMarshaling struct {
 	Indexed      bool
 }

-// UnmarshalJSON implements json.Unmarshaler interface
+// UnmarshalJSON implements json.Unmarshaler interface.
 func (argument *Argument) UnmarshalJSON(data []byte) error {
 	var arg ArgumentMarshaling
 	err := json.Unmarshal(data, &arg)
@@ -59,7 +59,7 @@ func (argument *Argument) UnmarshalJSON(data []byte) error {
 	return nil
 }

-// NonIndexed returns the arguments with indexed arguments filtered out
+// NonIndexed returns the arguments with indexed arguments filtered out.
 func (arguments Arguments) NonIndexed() Arguments {
 	var ret []Argument
 	for _, arg := range arguments {
@@ -70,37 +70,29 @@ func (arguments Arguments) NonIndexed() Arguments {
 	return ret
 }

-// isTuple returns true for non-atomic constructs, like (uint,uint) or uint[]
+// isTuple returns true for non-atomic constructs, like (uint,uint) or uint[].
 func (arguments Arguments) isTuple() bool {
 	return len(arguments) > 1
 }

-// Unpack performs the operation hexdata -> Go format
-func (arguments Arguments) Unpack(v interface{}, data []byte) error {
+// Unpack performs the operation hexdata -> Go format.
+func (arguments Arguments) Unpack(data []byte) ([]interface{}, error) {
 	if len(data) == 0 {
 		if len(arguments) != 0 {
-			return fmt.Errorf("abi: attempting to unmarshall an empty string while arguments are expected")
+			return nil, fmt.Errorf("abi: attempting to unmarshall an empty string while arguments are expected")
 		}
-		return nil // Nothing to unmarshal, return
+		// 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
 	}
-	// make sure the passed value is arguments pointer
-	if reflect.Ptr != reflect.ValueOf(v).Kind() {
-		return fmt.Errorf("abi: Unpack(non-pointer %T)", v)
-	}
-	marshalledValues, err := arguments.UnpackValues(data)
-	if err != nil {
-		return err
-	}
-	if len(marshalledValues) == 0 {
-		return fmt.Errorf("abi: Unpack(no-values unmarshalled %T)", v)
-	}
-	if arguments.isTuple() {
-		return arguments.unpackTuple(v, marshalledValues)
-	}
-	return arguments.unpackAtomic(v, marshalledValues[0])
+	return arguments.UnpackValues(data)
 }

-// UnpackIntoMap performs the operation hexdata -> mapping of argument name to argument value
+// UnpackIntoMap performs the operation hexdata -> mapping of argument name to argument value.
 func (arguments Arguments) UnpackIntoMap(v map[string]interface{}, data []byte) error {
 	// Make sure map is not nil
 	if v == nil {
@@ -122,8 +114,26 @@ func (arguments Arguments) UnpackIntoMap(v map[string]interface{}, data []byte)
 	return nil
 }

+// Copy performs the operation go format -> provided struct.
+func (arguments Arguments) Copy(v interface{}, values []interface{}) error {
+	// make sure the passed value is arguments pointer
+	if reflect.Ptr != reflect.ValueOf(v).Kind() {
+		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))
+		}
+		return nil // Nothing to copy, return
+	}
+	if arguments.isTuple() {
+		return arguments.copyTuple(v, values)
+	}
+	return arguments.copyAtomic(v, values[0])
+}
+
 // unpackAtomic unpacks ( hexdata -> go ) a single value
-func (arguments Arguments) unpackAtomic(v interface{}, marshalledValues interface{}) error {
+func (arguments Arguments) copyAtomic(v interface{}, marshalledValues interface{}) error {
 	dst := reflect.ValueOf(v).Elem()
 	src := reflect.ValueOf(marshalledValues)

@@ -133,8 +143,8 @@ func (arguments Arguments) unpackAtomic(v interface{}, marshalledValues interfac
 	return set(dst, src)
 }

-// unpackTuple unpacks ( hexdata -> go ) a batch of values.
-func (arguments Arguments) unpackTuple(v interface{}, marshalledValues []interface{}) error {
+// copyTuple copies a batch of values from marshalledValues to v.
+func (arguments Arguments) copyTuple(v interface{}, marshalledValues []interface{}) error {
 	value := reflect.ValueOf(v).Elem()
 	nonIndexedArgs := arguments.NonIndexed()

@@ -207,13 +217,13 @@ func (arguments Arguments) UnpackValues(data []byte) ([]interface{}, error) {
 	return retval, nil
 }

-// PackValues performs the operation Go format -> Hexdata
-// It is the semantic opposite of UnpackValues
+// PackValues performs the operation Go format -> Hexdata.
+// It is the semantic opposite of UnpackValues.
 func (arguments Arguments) PackValues(args []interface{}) ([]byte, error) {
 	return arguments.Pack(args...)
 }

-// Pack performs the operation Go format -> Hexdata
+// Pack performs the operation Go format -> Hexdata.
 func (arguments Arguments) Pack(args ...interface{}) ([]byte, error) {
 	// Make sure arguments match up and pack them
 	abiArgs := arguments
--- a/accounts/abi/bind/auth.go
+++ b/accounts/abi/bind/auth.go
@@ -21,6 +21,7 @@ import (
 	"errors"
 	"io"
 	"io/ioutil"
+	"math/big"

 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/accounts/external"
@@ -28,11 +29,21 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/log"
 )

+// ErrNoChainID is returned whenever the user failed to specify a chain id.
+var ErrNoChainID = errors.New("no chain id specified")
+
+// ErrNotAuthorized is returned when an account is not properly unlocked.
+var ErrNotAuthorized = errors.New("not authorized to sign this account")
+
 // NewTransactor is a utility method to easily create a transaction signer from
 // an encrypted json key stream and the associated passphrase.
+//
+// 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)
 	if err != nil {
 		return nil, err
@@ -45,13 +56,17 @@ func NewTransactor(keyin io.Reader, passphrase string) (*TransactOpts, error) {
 }

 // NewKeyStoreTransactor is a utility method to easily create a transaction signer from
-// an decrypted key from a keystore
+// an decrypted key from a keystore.
+//
+// Deprecated: Use NewKeyStoreTransactorWithChainID instead.
 func NewKeyStoreTransactor(keystore *keystore.KeyStore, account accounts.Account) (*TransactOpts, error) {
+	log.Warn("WARNING: NewKeyStoreTransactor has been deprecated in favour of NewTransactorWithChainID")
+	signer := types.HomesteadSigner{}
 	return &TransactOpts{
 		From: account.Address,
-		Signer: func(signer types.Signer, address common.Address, tx *types.Transaction) (*types.Transaction, error) {
+		Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
 			if address != account.Address {
-				return nil, errors.New("not authorized to sign this account")
+				return nil, ErrNotAuthorized
 			}
 			signature, err := keystore.SignHash(account, signer.Hash(tx).Bytes())
 			if err != nil {
@@ -64,13 +79,17 @@ func NewKeyStoreTransactor(keystore *keystore.KeyStore, account accounts.Account

 // NewKeyedTransactor is a utility method to easily create a transaction signer
 // from a single private key.
+//
+// Deprecated: Use NewKeyedTransactorWithChainID instead.
 func NewKeyedTransactor(key *ecdsa.PrivateKey) *TransactOpts {
+	log.Warn("WARNING: NewKeyedTransactor has been deprecated in favour of NewKeyedTransactorWithChainID")
 	keyAddr := crypto.PubkeyToAddress(key.PublicKey)
+	signer := types.HomesteadSigner{}
 	return &TransactOpts{
 		From: keyAddr,
-		Signer: func(signer types.Signer, address common.Address, tx *types.Transaction) (*types.Transaction, error) {
+		Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
 			if address != keyAddr {
-				return nil, errors.New("not authorized to sign this account")
+				return nil, ErrNotAuthorized
 			}
 			signature, err := crypto.Sign(signer.Hash(tx).Bytes(), key)
 			if err != nil {
@@ -81,14 +100,73 @@ func NewKeyedTransactor(key *ecdsa.PrivateKey) *TransactOpts {
 	}
 }

+// 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)
+	if err != nil {
+		return nil, err
+	}
+	key, err := keystore.DecryptKey(json, passphrase)
+	if err != nil {
+		return nil, err
+	}
+	return NewKeyedTransactorWithChainID(key.PrivateKey, chainID)
+}
+
+// NewKeyStoreTransactorWithChainID is a utility method to easily create a transaction signer from
+// an decrypted key from a keystore.
+func NewKeyStoreTransactorWithChainID(keystore *keystore.KeyStore, account accounts.Account, chainID *big.Int) (*TransactOpts, error) {
+	if chainID == nil {
+		return nil, ErrNoChainID
+	}
+	signer := types.LatestSignerForChainID(chainID)
+	return &TransactOpts{
+		From: account.Address,
+		Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
+			if address != account.Address {
+				return nil, ErrNotAuthorized
+			}
+			signature, err := keystore.SignHash(account, signer.Hash(tx).Bytes())
+			if err != nil {
+				return nil, err
+			}
+			return tx.WithSignature(signer, signature)
+		},
+	}, nil
+}
+
+// NewKeyedTransactorWithChainID is a utility method to easily create a transaction signer
+// from a single private key.
+func NewKeyedTransactorWithChainID(key *ecdsa.PrivateKey, chainID *big.Int) (*TransactOpts, error) {
+	keyAddr := crypto.PubkeyToAddress(key.PublicKey)
+	if chainID == nil {
+		return nil, ErrNoChainID
+	}
+	signer := types.LatestSignerForChainID(chainID)
+	return &TransactOpts{
+		From: keyAddr,
+		Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
+			if address != keyAddr {
+				return nil, ErrNotAuthorized
+			}
+			signature, err := crypto.Sign(signer.Hash(tx).Bytes(), key)
+			if err != nil {
+				return nil, err
+			}
+			return tx.WithSignature(signer, signature)
+		},
+	}, nil
+}
+
 // NewClefTransactor is a utility method to easily create a transaction signer
 // with a clef backend.
 func NewClefTransactor(clef *external.ExternalSigner, account accounts.Account) *TransactOpts {
 	return &TransactOpts{
 		From: account.Address,
-		Signer: func(signer types.Signer, address common.Address, transaction *types.Transaction) (*types.Transaction, error) {
+		Signer: func(address common.Address, transaction *types.Transaction) (*types.Transaction, error) {
 			if address != account.Address {
-				return nil, errors.New("not authorized to sign this account")
+				return nil, ErrNotAuthorized
 			}
 			return clef.SignTx(account, transaction, nil) // Clef enforces its own chain id
 		},
--- a/accounts/abi/bind/backend.go
+++ b/accounts/abi/bind/backend.go
@@ -41,7 +41,7 @@ var (
 	ErrNoCodeAfterDeploy = errors.New("no contract code after deployment")
 )

-// ContractCaller defines the methods needed to allow operating with contract on a read
+// ContractCaller defines the methods needed to allow operating with a contract on a read
 // only basis.
 type ContractCaller interface {
 	// CodeAt returns the code of the given account. This is needed to differentiate
@@ -62,8 +62,8 @@ type PendingContractCaller interface {
 	PendingCallContract(ctx context.Context, call ethereum.CallMsg) ([]byte, error)
 }

-// ContractTransactor defines the methods needed to allow operating with contract
-// on a write only basis. Beside the transacting method, the remainder are helpers
+// ContractTransactor defines the methods needed to allow operating with a contract
+// on a write only basis. Besides the transacting method, the remainder are helpers
 // used when the user does not provide some needed values, but rather leaves it up
 // to the transactor to decide.
 type ContractTransactor interface {
--- a/accounts/abi/bind/backends/simulated.go
+++ b/accounts/abi/bind/backends/simulated.go
@@ -74,6 +74,7 @@ type SimulatedBackend struct {

 // NewSimulatedBackendWithDatabase creates a new binding backend based on the given database
 // and uses a simulated blockchain for testing purposes.
+// A simulated backend always uses chainID 1337.
 func NewSimulatedBackendWithDatabase(database ethdb.Database, alloc core.GenesisAlloc, gasLimit uint64) *SimulatedBackend {
 	genesis := core.Genesis{Config: params.AllEthashProtocolChanges, GasLimit: gasLimit, Alloc: alloc}
 	genesis.MustCommit(database)
@@ -91,6 +92,7 @@ func NewSimulatedBackendWithDatabase(database ethdb.Database, alloc core.Genesis

 // NewSimulatedBackend creates a new binding backend using a simulated blockchain
 // for testing purposes.
+// A simulated backend always uses chainID 1337.
 func NewSimulatedBackend(alloc core.GenesisAlloc, gasLimit uint64) *SimulatedBackend {
 	return NewSimulatedBackendWithDatabase(rawdb.NewMemoryDatabase(), alloc, gasLimit)
 }
@@ -123,10 +125,9 @@ func (b *SimulatedBackend) Rollback() {

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

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

 // stateByBlockNumber retrieves a state by a given blocknumber.
@@ -195,7 +196,7 @@ func (b *SimulatedBackend) StorageAt(ctx context.Context, contract common.Addres
 }

 // TransactionReceipt returns the receipt of a transaction.
-func (b *SimulatedBackend) TransactionReceipt(_ context.Context, txHash common.Hash) (*types.Receipt, error) {
+func (b *SimulatedBackend) TransactionReceipt(ctx context.Context, txHash common.Hash) (*types.Receipt, error) {
 	b.mu.Lock()
 	defer b.mu.Unlock()

@@ -207,7 +208,7 @@ func (b *SimulatedBackend) TransactionReceipt(_ context.Context, txHash common.H
 // blockchain. The isPending return value indicates whether the transaction has been
 // mined yet. Note that the transaction may not be part of the canonical chain even if
 // it's not pending.
-func (b *SimulatedBackend) TransactionByHash(_ context.Context, txHash common.Hash) (*types.Transaction, bool, error) {
+func (b *SimulatedBackend) TransactionByHash(ctx context.Context, txHash common.Hash) (*types.Transaction, bool, error) {
 	b.mu.Lock()
 	defer b.mu.Unlock()

@@ -223,7 +224,7 @@ func (b *SimulatedBackend) TransactionByHash(_ context.Context, txHash common.Ha
 }

 // BlockByHash retrieves a block based on the block hash.
-func (b *SimulatedBackend) BlockByHash(_ context.Context, hash common.Hash) (*types.Block, error) {
+func (b *SimulatedBackend) BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error) {
 	b.mu.Lock()
 	defer b.mu.Unlock()

@@ -250,7 +251,7 @@ func (b *SimulatedBackend) BlockByNumber(ctx context.Context, number *big.Int) (

 // blockByNumberNoLock retrieves a block from the database by number, caching it
 // (associated with its hash) if found without Lock.
-func (b *SimulatedBackend) blockByNumberNoLock(_ context.Context, number *big.Int) (*types.Block, error) {
+func (b *SimulatedBackend) blockByNumberNoLock(ctx context.Context, number *big.Int) (*types.Block, error) {
 	if number == nil || number.Cmp(b.pendingBlock.Number()) == 0 {
 		return b.blockchain.CurrentBlock(), nil
 	}
@@ -264,7 +265,7 @@ func (b *SimulatedBackend) blockByNumberNoLock(_ context.Context, number *big.In
 }

 // HeaderByHash returns a block header from the current canonical chain.
-func (b *SimulatedBackend) HeaderByHash(_ context.Context, hash common.Hash) (*types.Header, error) {
+func (b *SimulatedBackend) HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error) {
 	b.mu.Lock()
 	defer b.mu.Unlock()

@@ -282,7 +283,7 @@ func (b *SimulatedBackend) HeaderByHash(_ context.Context, hash common.Hash) (*t

 // HeaderByNumber returns a block header from the current canonical chain. If number is
 // nil, the latest known header is returned.
-func (b *SimulatedBackend) HeaderByNumber(_ context.Context, block *big.Int) (*types.Header, error) {
+func (b *SimulatedBackend) HeaderByNumber(ctx context.Context, block *big.Int) (*types.Header, error) {
 	b.mu.Lock()
 	defer b.mu.Unlock()

@@ -294,7 +295,7 @@ func (b *SimulatedBackend) HeaderByNumber(_ context.Context, block *big.Int) (*t
 }

 // TransactionCount returns the number of transactions in a given block.
-func (b *SimulatedBackend) TransactionCount(_ context.Context, blockHash common.Hash) (uint, error) {
+func (b *SimulatedBackend) TransactionCount(ctx context.Context, blockHash common.Hash) (uint, error) {
 	b.mu.Lock()
 	defer b.mu.Unlock()

@@ -311,7 +312,7 @@ func (b *SimulatedBackend) TransactionCount(_ context.Context, blockHash common.
 }

 // TransactionInBlock returns the transaction for a specific block at a specific index.
-func (b *SimulatedBackend) TransactionInBlock(_ context.Context, blockHash common.Hash, index uint) (*types.Transaction, error) {
+func (b *SimulatedBackend) TransactionInBlock(ctx context.Context, blockHash common.Hash, index uint) (*types.Transaction, error) {
 	b.mu.Lock()
 	defer b.mu.Unlock()

@@ -338,7 +339,7 @@ func (b *SimulatedBackend) TransactionInBlock(_ context.Context, blockHash commo
 }

 // PendingCodeAt returns the code associated with an account in the pending state.
-func (b *SimulatedBackend) PendingCodeAt(_ context.Context, contract common.Address) ([]byte, error) {
+func (b *SimulatedBackend) PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error) {
 	b.mu.Lock()
 	defer b.mu.Unlock()

@@ -417,7 +418,7 @@ func (b *SimulatedBackend) PendingCallContract(ctx context.Context, call ethereu

 // PendingNonceAt implements PendingStateReader.PendingNonceAt, retrieving
 // the nonce currently pending for the account.
-func (b *SimulatedBackend) PendingNonceAt(_ context.Context, account common.Address) (uint64, error) {
+func (b *SimulatedBackend) PendingNonceAt(ctx context.Context, account common.Address) (uint64, error) {
 	b.mu.Lock()
 	defer b.mu.Unlock()

@@ -426,7 +427,7 @@ func (b *SimulatedBackend) PendingNonceAt(_ context.Context, account common.Addr

 // 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(_ context.Context) (*big.Int, error) {
+func (b *SimulatedBackend) SuggestGasPrice(ctx context.Context) (*big.Int, error) {
 	return big.NewInt(1), nil
 }

@@ -479,7 +480,7 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
 		b.pendingState.RevertToSnapshot(snapshot)

 		if err != nil {
-			if err == core.ErrIntrinsicGas {
+			if errors.Is(err, core.ErrIntrinsicGas) {
 				return true, nil, nil // Special case, raise gas limit
 			}
 			return true, nil, err // Bail out
@@ -525,7 +526,7 @@ 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(_ context.Context, call ethereum.CallMsg, block *types.Block, stateDB *state.StateDB) (*core.ExecutionResult, error) {
+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)
@@ -542,10 +543,11 @@ func (b *SimulatedBackend) callContract(_ context.Context, call ethereum.CallMsg
 	// Execute the call.
 	msg := callMsg{call}

-	evmContext := core.NewEVMContext(msg, block.Header(), b.blockchain, nil)
+	txContext := core.NewEVMTxContext(msg)
+	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, stateDB, b.config, vm.Config{})
+	vmEnv := vm.NewEVM(evmContext, txContext, stateDB, b.config, vm.Config{})
 	gasPool := new(core.GasPool).AddGas(math.MaxUint64)

 	return core.NewStateTransition(vmEnv, msg, gasPool).TransitionDb()
@@ -553,11 +555,14 @@ func (b *SimulatedBackend) callContract(_ context.Context, call ethereum.CallMsg

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

-	sender, err := types.Sender(types.NewEIP155Signer(b.config.ChainID), tx)
+	// Check transaction validity.
+	block := b.blockchain.CurrentBlock()
+	signer := types.MakeSigner(b.blockchain.Config(), block.Number())
+	sender, err := types.Sender(signer, tx)
 	if err != nil {
 		panic(fmt.Errorf("invalid transaction: %v", err))
 	}
@@ -566,7 +571,8 @@ func (b *SimulatedBackend) SendTransaction(_ context.Context, tx *types.Transact
 		panic(fmt.Errorf("invalid transaction nonce: got %d, want %d", tx.Nonce(), nonce))
 	}

-	blocks, _ := core.GenerateChain(b.config, b.blockchain.CurrentBlock(), ethash.NewFaker(), b.database, 1, func(number int, block *core.BlockGen) {
+	// 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)
 		}
@@ -615,7 +621,7 @@ func (b *SimulatedBackend) FilterLogs(ctx context.Context, query ethereum.Filter

 // SubscribeFilterLogs creates a background log filtering operation, returning a
 // subscription immediately, which can be used to stream the found events.
-func (b *SimulatedBackend) SubscribeFilterLogs(_ context.Context, query ethereum.FilterQuery, ch chan<- types.Log) (ethereum.Subscription, error) {
+func (b *SimulatedBackend) SubscribeFilterLogs(ctx context.Context, query ethereum.FilterQuery, ch chan<- types.Log) (ethereum.Subscription, error) {
 	// Subscribe to contract events
 	sink := make(chan []*types.Log)

@@ -648,7 +654,7 @@ func (b *SimulatedBackend) SubscribeFilterLogs(_ context.Context, query ethereum
 }

 // SubscribeNewHead returns an event subscription for a new header.
-func (b *SimulatedBackend) SubscribeNewHead(_ context.Context, ch chan<- *types.Header) (ethereum.Subscription, error) {
+func (b *SimulatedBackend) SubscribeNewHead(ctx context.Context, ch chan<- *types.Header) (ethereum.Subscription, error) {
 	// subscribe to a new head
 	sink := make(chan *types.Header)
 	sub := b.events.SubscribeNewHeads(sink)
@@ -705,14 +711,15 @@ type callMsg struct {
 	ethereum.CallMsg
 }

-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) To() *common.Address  { return m.CallMsg.To }
-func (m callMsg) GasPrice() *big.Int   { return m.CallMsg.GasPrice }
-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 }
+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) To() *common.Address          { return m.CallMsg.To }
+func (m callMsg) GasPrice() *big.Int           { return m.CallMsg.GasPrice }
+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 }
+func (m callMsg) AccessList() types.AccessList { return m.CallMsg.AccessList }

 // filterBackend implements filters.Backend to support filtering for logs without
 // taking bloom-bits acceleration structures into account.
@@ -724,18 +731,18 @@ type filterBackend struct {
 func (fb *filterBackend) ChainDb() ethdb.Database  { return fb.db }
 func (fb *filterBackend) EventMux() *event.TypeMux { panic("not supported") }

-func (fb *filterBackend) HeaderByNumber(_ context.Context, block rpc.BlockNumber) (*types.Header, error) {
+func (fb *filterBackend) HeaderByNumber(ctx context.Context, block rpc.BlockNumber) (*types.Header, error) {
 	if block == rpc.LatestBlockNumber {
 		return fb.bc.CurrentHeader(), nil
 	}
 	return fb.bc.GetHeaderByNumber(uint64(block.Int64())), nil
 }

-func (fb *filterBackend) HeaderByHash(_ context.Context, hash common.Hash) (*types.Header, error) {
+func (fb *filterBackend) HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error) {
 	return fb.bc.GetHeaderByHash(hash), nil
 }

-func (fb *filterBackend) GetReceipts(_ context.Context, hash common.Hash) (types.Receipts, error) {
+func (fb *filterBackend) GetReceipts(ctx context.Context, hash common.Hash) (types.Receipts, error) {
 	number := rawdb.ReadHeaderNumber(fb.db, hash)
 	if number == nil {
 		return nil, nil
@@ -743,7 +750,7 @@ func (fb *filterBackend) GetReceipts(_ context.Context, hash common.Hash) (types
 	return rawdb.ReadReceipts(fb.db, hash, *number, fb.bc.Config()), nil
 }

-func (fb *filterBackend) GetLogs(_ context.Context, hash common.Hash) ([][]*types.Log, error) {
+func (fb *filterBackend) GetLogs(ctx context.Context, hash common.Hash) ([][]*types.Log, error) {
 	number := rawdb.ReadHeaderNumber(fb.db, hash)
 	if number == nil {
 		return nil, nil
@@ -759,7 +766,7 @@ func (fb *filterBackend) GetLogs(_ context.Context, hash common.Hash) ([][]*type
 	return logs, nil
 }

-func (fb *filterBackend) SubscribeNewTxsEvent(_ chan<- core.NewTxsEvent) event.Subscription {
+func (fb *filterBackend) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
 	return nullSubscription()
 }

@@ -775,13 +782,13 @@ func (fb *filterBackend) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscr
 	return fb.bc.SubscribeLogsEvent(ch)
 }

-func (fb *filterBackend) SubscribePendingLogsEvent(_ chan<- []*types.Log) event.Subscription {
+func (fb *filterBackend) SubscribePendingLogsEvent(ch chan<- []*types.Log) event.Subscription {
 	return nullSubscription()
 }

 func (fb *filterBackend) BloomStatus() (uint64, uint64) { return 4096, 0 }

-func (fb *filterBackend) ServiceFilter(_ context.Context, _ *bloombits.MatcherSession) {
+func (fb *filterBackend) ServiceFilter(ctx context.Context, ms *bloombits.MatcherSession) {
 	panic("not supported")
 }

--- a/accounts/abi/bind/backends/simulated_test.go
+++ b/accounts/abi/bind/backends/simulated_test.go
@@ -39,7 +39,7 @@ import (
 func TestSimulatedBackend(t *testing.T) {
 	var gasLimit uint64 = 8000029
 	key, _ := crypto.GenerateKey() // nolint: gosec
-	auth := bind.NewKeyedTransactor(key)
+	auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
 	genAlloc := make(core.GenesisAlloc)
 	genAlloc[auth.From] = core.GenesisAccount{Balance: big.NewInt(9223372036854775807)}

@@ -411,7 +411,7 @@ func TestSimulatedBackend_EstimateGas(t *testing.T) {

 	key, _ := crypto.GenerateKey()
 	addr := crypto.PubkeyToAddress(key.PublicKey)
-	opts := bind.NewKeyedTransactor(key)
+	opts, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 	sim := NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(params.Ether)}}, 10000000)
 	defer sim.Close()
@@ -888,7 +888,7 @@ func TestSimulatedBackend_PendingCodeAt(t *testing.T) {
 	if err != nil {
 		t.Errorf("could not get code at test addr: %v", err)
 	}
-	auth := bind.NewKeyedTransactor(testKey)
+	auth, _ := bind.NewKeyedTransactorWithChainID(testKey, big.NewInt(1337))
 	contractAddr, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex(abiBin), sim)
 	if err != nil {
 		t.Errorf("could not deploy contract: %v tx: %v contract: %v", err, tx, contract)
@@ -924,7 +924,7 @@ func TestSimulatedBackend_CodeAt(t *testing.T) {
 	if err != nil {
 		t.Errorf("could not get code at test addr: %v", err)
 	}
-	auth := bind.NewKeyedTransactor(testKey)
+	auth, _ := bind.NewKeyedTransactorWithChainID(testKey, big.NewInt(1337))
 	contractAddr, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex(abiBin), sim)
 	if err != nil {
 		t.Errorf("could not deploy contract: %v tx: %v contract: %v", err, tx, contract)
@@ -956,7 +956,7 @@ func TestSimulatedBackend_PendingAndCallContract(t *testing.T) {
 	if err != nil {
 		t.Errorf("could not get code at test addr: %v", err)
 	}
-	contractAuth := bind.NewKeyedTransactor(testKey)
+	contractAuth, _ := bind.NewKeyedTransactorWithChainID(testKey, big.NewInt(1337))
 	addr, _, _, err := bind.DeployContract(contractAuth, parsed, common.FromHex(abiBin), sim)
 	if err != nil {
 		t.Errorf("could not deploy contract: %v", err)
@@ -1043,7 +1043,7 @@ func TestSimulatedBackend_CallContractRevert(t *testing.T) {
 	if err != nil {
 		t.Errorf("could not get code at test addr: %v", err)
 	}
-	contractAuth := bind.NewKeyedTransactor(testKey)
+	contractAuth, _ := bind.NewKeyedTransactorWithChainID(testKey, big.NewInt(1337))
 	addr, _, _, err := bind.DeployContract(contractAuth, parsed, common.FromHex(reverterBin), sim)
 	if err != nil {
 		t.Errorf("could not deploy contract: %v", err)
@@ -1086,12 +1086,12 @@ func TestSimulatedBackend_CallContractRevert(t *testing.T) {
 				t.Errorf("result from %v was not nil: %v", key, res)
 			}
 			if val != nil {
-				rErr, ok := err.(*revertError)
+				rerr, ok := err.(*revertError)
 				if !ok {
 					t.Errorf("expect revert error")
 				}
-				if rErr.Error() != "execution reverted: "+val.(string) {
-					t.Errorf("error was malformed: got %v want %v", rErr.Error(), val)
+				if rerr.Error() != "execution reverted: "+val.(string) {
+					t.Errorf("error was malformed: got %v want %v", rerr.Error(), val)
 				}
 			} else {
 				// revert(0x0,0x0)
--- a/accounts/abi/bind/base.go
+++ b/accounts/abi/bind/base.go
@@ -32,7 +32,7 @@ import (

 // SignerFn is a signer function callback when a contract requires a method to
 // sign the transaction before submission.
-type SignerFn func(types.Signer, common.Address, *types.Transaction) (*types.Transaction, error)
+type SignerFn func(common.Address, *types.Transaction) (*types.Transaction, error)

 // CallOpts is the collection of options to fine tune a contract call request.
 type CallOpts struct {
@@ -117,11 +117,14 @@ func DeployContract(opts *TransactOpts, abi abi.ABI, bytecode []byte, backend Co
 // sets the output to result. The result type might be a single field for simple
 // returns, a slice of interfaces for anonymous returns and a struct for named
 // returns.
-func (c *BoundContract) Call(opts *CallOpts, result interface{}, method string, params ...interface{}) error {
+func (c *BoundContract) Call(opts *CallOpts, results *[]interface{}, method string, params ...interface{}) error {
 	// Don't crash on a lazy user
 	if opts == nil {
 		opts = new(CallOpts)
 	}
+	if results == nil {
+		results = new([]interface{})
+	}
 	// Pack the input, call and unpack the results
 	input, err := c.abi.Pack(method, params...)
 	if err != nil {
@@ -149,7 +152,10 @@ func (c *BoundContract) Call(opts *CallOpts, result interface{}, method string,
 		}
 	} else {
 		output, err = c.caller.CallContract(ctx, msg, opts.BlockNumber)
-		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 = c.caller.CodeAt(ctx, c.address, opts.BlockNumber); err != nil {
 				return err
@@ -158,10 +164,14 @@ func (c *BoundContract) Call(opts *CallOpts, result interface{}, method string,
 			}
 		}
 	}
-	if err != nil {
+
+	if len(*results) == 0 {
+		res, err := c.abi.Unpack(method, output)
+		*results = res
 		return err
 	}
-	return c.abi.Unpack(result, method, output)
+	res := *results
+	return c.abi.UnpackIntoInterface(res[0], method, output)
 }

 // Transact invokes the (paid) contract method with params as input values.
@@ -177,7 +187,7 @@ func (c *BoundContract) Transact(opts *TransactOpts, method string, params ...in
 }

 // RawTransact initiates a transaction with the given raw calldata as the input.
-// It's usually used to initiates transaction for invoking **Fallback** function.
+// It's usually used to initiate transactions for invoking **Fallback** function.
 func (c *BoundContract) RawTransact(opts *TransactOpts, calldata []byte) (*types.Transaction, error) {
 	// todo(rjl493456442) check the method is payable or not,
 	// reject invalid transaction at the first place
@@ -246,7 +256,7 @@ func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, i
 	if opts.Signer == nil {
 		return nil, errors.New("no signer to authorize the transaction with")
 	}
-	signedTx, err := opts.Signer(types.HomesteadSigner{}, opts.From, rawTx)
+	signedTx, err := opts.Signer(opts.From, rawTx)
 	if err != nil {
 		return nil, err
 	}
@@ -339,7 +349,7 @@ 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 len(log.Data) > 0 {
-		if err := c.abi.Unpack(out, event, log.Data); err != nil {
+		if err := c.abi.UnpackIntoInterface(out, event, log.Data); err != nil {
 			return err
 		}
 	}
--- a/accounts/abi/bind/base_test.go
+++ b/accounts/abi/bind/base_test.go
@@ -71,11 +71,10 @@ func TestPassingBlockNumber(t *testing.T) {
 			},
 		},
 	}, mc, nil, nil)
-	var ret string

 	blockNumber := big.NewInt(42)

-	bc.Call(&bind.CallOpts{BlockNumber: blockNumber}, &ret, "something")
+	bc.Call(&bind.CallOpts{BlockNumber: blockNumber}, nil, "something")

 	if mc.callContractBlockNumber != blockNumber {
 		t.Fatalf("CallContract() was not passed the block number")
@@ -85,7 +84,7 @@ func TestPassingBlockNumber(t *testing.T) {
 		t.Fatalf("CodeAt() was not passed the block number")
 	}

-	bc.Call(&bind.CallOpts{}, &ret, "something")
+	bc.Call(&bind.CallOpts{}, nil, "something")

 	if mc.callContractBlockNumber != nil {
 		t.Fatalf("CallContract() was passed a block number when it should not have been")
@@ -95,7 +94,7 @@ func TestPassingBlockNumber(t *testing.T) {
 		t.Fatalf("CodeAt() was passed a block number when it should not have been")
 	}

-	bc.Call(&bind.CallOpts{BlockNumber: blockNumber, Pending: true}, &ret, "something")
+	bc.Call(&bind.CallOpts{BlockNumber: blockNumber, Pending: true}, nil, "something")

 	if !mc.pendingCallContractCalled {
 		t.Fatalf("CallContract() was not passed the block number")
--- a/accounts/abi/bind/bind.go
+++ b/accounts/abi/bind/bind.go
@@ -52,7 +52,7 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 		// contracts is the map of each individual contract requested binding
 		contracts = make(map[string]*tmplContract)

-		// structs is the map of all reclared structs shared by passed contracts.
+		// structs is the map of all redeclared structs shared by passed contracts.
 		structs = make(map[string]*tmplStruct)

 		// isLib is the map used to flag each encountered library as such
@@ -80,10 +80,10 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 			fallback  *tmplMethod
 			receive   *tmplMethod

-			// identifiers are used to detect duplicated identifier of function
-			// and event. For all calls, transacts and events, abigen will generate
+			// identifiers are used to detect duplicated identifiers of functions
+			// and events. For all calls, transacts and events, abigen will generate
 			// corresponding bindings. However we have to ensure there is no
-			// identifier coliision in the bindings of these categories.
+			// identifier collisions in the bindings of these categories.
 			callIdentifiers     = make(map[string]bool)
 			transactIdentifiers = make(map[string]bool)
 			eventIdentifiers    = make(map[string]bool)
@@ -246,7 +246,7 @@ var bindType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct) stri
 	LangJava: bindTypeJava,
 }

-// bindBasicTypeGo converts basic solidity types(except array, slice and tuple) to Go one.
+// bindBasicTypeGo converts basic solidity types(except array, slice and tuple) to Go ones.
 func bindBasicTypeGo(kind abi.Type) string {
 	switch kind.T {
 	case abi.AddressTy:
@@ -286,7 +286,7 @@ func bindTypeGo(kind abi.Type, structs map[string]*tmplStruct) string {
 	}
 }

-// bindBasicTypeJava converts basic solidity types(except array, slice and tuple) to Java one.
+// bindBasicTypeJava converts basic solidity types(except array, slice and tuple) to Java ones.
 func bindBasicTypeJava(kind abi.Type) string {
 	switch kind.T {
 	case abi.AddressTy:
@@ -330,7 +330,7 @@ func bindBasicTypeJava(kind abi.Type) string {
 }

 // pluralizeJavaType explicitly converts multidimensional types to predefined
-// type in go side.
+// types in go side.
 func pluralizeJavaType(typ string) string {
 	switch typ {
 	case "boolean":
@@ -369,7 +369,7 @@ var bindTopicType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct)
 }

 // bindTopicTypeGo converts a Solidity topic type to a Go one. It is almost the same
-// funcionality as for simple types, but dynamic types get converted to hashes.
+// functionality as for simple types, but dynamic types get converted to hashes.
 func bindTopicTypeGo(kind abi.Type, structs map[string]*tmplStruct) string {
 	bound := bindTypeGo(kind, structs)

@@ -386,7 +386,7 @@ func bindTopicTypeGo(kind abi.Type, structs map[string]*tmplStruct) string {
 }

 // bindTopicTypeJava converts a Solidity topic type to a Java one. It is almost the same
-// funcionality as for simple types, but dynamic types get converted to hashes.
+// functionality as for simple types, but dynamic types get converted to hashes.
 func bindTopicTypeJava(kind abi.Type, structs map[string]*tmplStruct) string {
 	bound := bindTypeJava(kind, structs)

@@ -394,7 +394,7 @@ func bindTopicTypeJava(kind abi.Type, structs map[string]*tmplStruct) string {
 	// parameters that are not value types i.e. arrays and structs are not
 	// stored directly but instead a keccak256-hash of an encoding is stored.
 	//
-	// We only convert stringS and bytes to hash, still need to deal with
+	// We only convert strings and bytes to hash, still need to deal with
 	// array(both fixed-size and dynamic-size) and struct.
 	if bound == "String" || bound == "byte[]" {
 		bound = "Hash"
@@ -415,7 +415,7 @@ var bindStructType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct
 func bindStructTypeGo(kind abi.Type, structs map[string]*tmplStruct) string {
 	switch kind.T {
 	case abi.TupleTy:
-		// We compose raw struct name and canonical parameter expression
+		// We compose a raw struct name and a canonical parameter expression
 		// together here. The reason is before solidity v0.5.11, kind.TupleRawName
 		// is empty, so we use canonical parameter expression to distinguish
 		// different struct definition. From the consideration of backward
@@ -454,7 +454,7 @@ func bindStructTypeGo(kind abi.Type, structs map[string]*tmplStruct) string {
 func bindStructTypeJava(kind abi.Type, structs map[string]*tmplStruct) string {
 	switch kind.T {
 	case abi.TupleTy:
-		// We compose raw struct name and canonical parameter expression
+		// We compose a raw struct name and a canonical parameter expression
 		// together here. The reason is before solidity v0.5.11, kind.TupleRawName
 		// is empty, so we use canonical parameter expression to distinguish
 		// different struct definition. From the consideration of backward
@@ -486,7 +486,7 @@ func bindStructTypeJava(kind abi.Type, structs map[string]*tmplStruct) string {
 }

 // namedType is a set of functions that transform language specific types to
-// named versions that my be used inside method names.
+// named versions that may be used inside method names.
 var namedType = map[Lang]func(string, abi.Type) string{
 	LangGo:   func(string, abi.Type) string { panic("this shouldn't be needed") },
 	LangJava: namedTypeJava,
@@ -528,7 +528,7 @@ func alias(aliases map[string]string, n string) string {
 }

 // methodNormalizer is a name transformer that modifies Solidity method names to
-// conform to target language naming concentions.
+// conform to target language naming conventions.
 var methodNormalizer = map[Lang]func(string) string{
 	LangGo:   abi.ToCamelCase,
 	LangJava: decapitalise,
--- a/accounts/abi/bind/bind_test.go
+++ b/accounts/abi/bind/bind_test.go
@@ -296,7 +296,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -351,7 +351,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -397,7 +397,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -455,7 +455,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -503,7 +503,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -529,6 +529,70 @@ var bindTests = []struct {
 		nil,
 		nil,
 	},
+	// Tests that structs are correctly unpacked
+	{
+
+		`Structs`,
+		`
+		pragma solidity ^0.6.5;
+			pragma experimental ABIEncoderV2;
+			contract Structs {
+				struct A {
+					bytes32 B;
+				}
+				
+				function F() public view returns (A[] memory a, uint256[] memory c, bool[] memory d) {
+					A[] memory a = new A[](2);
+					a[0].B = bytes32(uint256(1234) << 96);
+					uint256[] memory c;
+					bool[] memory d;
+					return (a, c, d);
+				}
+			
+				function G() public view returns (A[] memory a) {
+					A[] memory a = new A[](2);
+					a[0].B = bytes32(uint256(1234) << 96);
+					return a;
+				}
+			}
+		`,
+		[]string{`608060405234801561001057600080fd5b50610278806100206000396000f3fe608060405234801561001057600080fd5b50600436106100365760003560e01c806328811f591461003b5780636fecb6231461005b575b600080fd5b610043610070565b604051610052939291906101a0565b60405180910390f35b6100636100d6565b6040516100529190610186565b604080516002808252606082810190935282918291829190816020015b610095610131565b81526020019060019003908161008d575050805190915061026960611b9082906000906100be57fe5b60209081029190910101515293606093508392509050565b6040805160028082526060828101909352829190816020015b6100f7610131565b8152602001906001900390816100ef575050805190915061026960611b90829060009061012057fe5b602090810291909101015152905090565b60408051602081019091526000815290565b815260200190565b6000815180845260208085019450808401835b8381101561017b578151518752958201959082019060010161015e565b509495945050505050565b600060208252610199602083018461014b565b9392505050565b6000606082526101b3606083018661014b565b6020838203818501528186516101c98185610239565b91508288019350845b818110156101f3576101e5838651610143565b9484019492506001016101d2565b505084810360408601528551808252908201925081860190845b8181101561022b57825115158552938301939183019160010161020d565b509298975050505050505050565b9081526020019056fea2646970667358221220eb85327e285def14230424c52893aebecec1e387a50bb6b75fc4fdbed647f45f64736f6c63430006050033`},
+		[]string{`[{"inputs":[],"name":"F","outputs":[{"components":[{"internalType":"bytes32","name":"B","type":"bytes32"}],"internalType":"structStructs.A[]","name":"a","type":"tuple[]"},{"internalType":"uint256[]","name":"c","type":"uint256[]"},{"internalType":"bool[]","name":"d","type":"bool[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"G","outputs":[{"components":[{"internalType":"bytes32","name":"B","type":"bytes32"}],"internalType":"structStructs.A[]","name":"a","type":"tuple[]"}],"stateMutability":"view","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"
+		`,
+		`
+			// Generate a new random account and a funded simulator
+			key, _ := crypto.GenerateKey()
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
+		
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
+		
+			// Deploy a structs method invoker contract and execute its default method
+			_, _, structs, err := DeployStructs(auth, sim)
+			if err != nil {
+				t.Fatalf("Failed to deploy defaulter contract: %v", err)
+			}
+			sim.Commit()
+			opts := bind.CallOpts{}
+			if _, err := structs.F(&opts); err != nil {
+				t.Fatalf("Failed to invoke F method: %v", err)
+			}
+			if _, err := structs.G(&opts); err != nil {
+				t.Fatalf("Failed to invoke G method: %v", err)
+			}
+		`,
+		nil,
+		nil,
+		nil,
+		nil,
+	},
 	// Tests that non-existent contracts are reported as such (though only simulator test)
 	{
 		`NonExistent`,
@@ -569,6 +633,45 @@ var bindTests = []struct {
 		nil,
 		nil,
 	},
+	{
+		`NonExistentStruct`,
+		`
+			contract NonExistentStruct {
+				function Struct() public view returns(uint256 a, uint256 b) {
+					return (10, 10);
+				}
+			}
+		`,
+		[]string{`6080604052348015600f57600080fd5b5060888061001e6000396000f3fe6080604052348015600f57600080fd5b506004361060285760003560e01c8063d5f6622514602d575b600080fd5b6033604c565b6040805192835260208301919091528051918290030190f35b600a809156fea264697066735822beefbeefbeefbeefbeefbeefbeefbeefbeefbeefbeefbeefbeefbeefbeefbeefbeef64736f6c6343decafe0033`},
+		[]string{`[{"inputs":[],"name":"Struct","outputs":[{"internalType":"uint256","name":"a","type":"uint256"},{"internalType":"uint256","name":"b","type":"uint256"}],"stateMutability":"pure","type":"function"}]`},
+		`
+			"github.com/ethereum/go-ethereum/accounts/abi/bind"
+			"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
+			"github.com/ethereum/go-ethereum/common"
+			"github.com/ethereum/go-ethereum/core"
+		`,
+		`
+			// Create a simulator and wrap a non-deployed contract
+
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{}, uint64(10000000000))
+			defer sim.Close()
+
+			nonexistent, err := NewNonExistentStruct(common.Address{}, sim)
+			if err != nil {
+				t.Fatalf("Failed to access non-existent contract: %v", err)
+			}
+			// Ensure that contract calls fail with the appropriate error
+			if res, err := nonexistent.Struct(nil); err == nil {
+				t.Fatalf("Call succeeded on non-existent contract: %v", res)
+			} else if (err != bind.ErrNoCode) {
+				t.Fatalf("Error mismatch: have %v, want %v", err, bind.ErrNoCode)
+			}
+		`,
+		nil,
+		nil,
+		nil,
+		nil,
+	},
 	// Tests that gas estimation works for contracts with weird gas mechanics too.
 	{
 		`FunkyGasPattern`,
@@ -598,7 +701,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -648,7 +751,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -723,7 +826,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -817,7 +920,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -1007,7 +1110,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -1142,7 +1245,7 @@ var bindTests = []struct {

 		`
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -1284,7 +1387,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -1350,7 +1453,7 @@ var bindTests = []struct {
 		`
 		// Initialize test accounts
 		key, _ := crypto.GenerateKey()
-		auth := bind.NewKeyedTransactor(key)
+		auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
 		sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 		defer sim.Close()

@@ -1444,7 +1547,7 @@ var bindTests = []struct {
 		sim := backends.NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(1000000000)}}, 10000000)
 		defer sim.Close()

-		transactOpts := bind.NewKeyedTransactor(key)
+		transactOpts, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
 		_, _, _, err := DeployIdentifierCollision(transactOpts, sim)
 		if err != nil {
 			t.Fatalf("failed to deploy contract: %v", err)
@@ -1506,7 +1609,7 @@ var bindTests = []struct {
 		sim := backends.NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(1000000000)}}, 10000000)
 		defer sim.Close()

-		transactOpts := bind.NewKeyedTransactor(key)
+		transactOpts, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
 		_, _, c1, err := DeployContractOne(transactOpts, sim)
 		if err != nil {
 			t.Fatal("Failed to deploy contract")
@@ -1563,7 +1666,7 @@ var bindTests = []struct {
 		`
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
-			auth := bind.NewKeyedTransactor(key)
+			auth, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))

 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 			defer sim.Close()
@@ -1601,11 +1704,7 @@ var bindTests = []struct {
 		contract NewFallbacks {
 			event Fallback(bytes data);
 			fallback() external {
-				bytes memory data;
-				assembly {
-					calldatacopy(data, 0, calldatasize())
-				}
-				emit Fallback(data);
+				emit Fallback(msg.data);
 			}
 	
 			event Received(address addr, uint value);
@@ -1614,7 +1713,7 @@ var bindTests = []struct {
 			}
 		}
 	   `,
-		[]string{"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"},
+		[]string{"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"},
 		[]string{`[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"Fallback","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"addr","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Received","type":"event"},{"stateMutability":"nonpayable","type":"fallback"},{"stateMutability":"payable","type":"receive"}]`},
 		`
 			"bytes"
@@ -1632,7 +1731,7 @@ var bindTests = []struct {
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(1000000000)}}, 1000000)
 			defer sim.Close()
 	
-			opts := bind.NewKeyedTransactor(key)
+			opts, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
 			_, _, c, err := DeployNewFallbacks(opts, sim)
 			if err != nil {
 				t.Fatalf("Failed to deploy contract: %v", err)
@@ -1662,6 +1761,7 @@ var bindTests = []struct {
 			}
 	
 			// Test fallback function
+			gotEvent = false
 			opts.Value = nil
 			calldata := []byte{0x01, 0x02, 0x03}
 			c.Fallback(opts, calldata)
@@ -1696,11 +1796,11 @@ 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("", "")
+	ws, err := ioutil.TempDir("", "binding-test")
 	if err != nil {
 		t.Fatalf("failed to create temporary workspace: %v", err)
 	}
-	defer os.RemoveAll(ws)
+	//defer os.RemoveAll(ws)

 	pkg := filepath.Join(ws, "bindtest")
 	if err = os.MkdirAll(pkg, 0700); err != nil {
@@ -1746,11 +1846,16 @@ func TestGolangBindings(t *testing.T) {
 		t.Fatalf("failed to convert binding test to modules: %v\n%s", err, out)
 	}
 	pwd, _ := os.Getwd()
-	replacer := exec.Command(gocmd, "mod", "edit", "-replace", "github.com/ethereum/go-ethereum="+filepath.Join(pwd, "..", "..", "..")) // Repo root
+	replacer := exec.Command(gocmd, "mod", "edit", "-x", "-require", "github.com/ethereum/go-ethereum@v0.0.0", "-replace", "github.com/ethereum/go-ethereum="+filepath.Join(pwd, "..", "..", "..")) // Repo root
 	replacer.Dir = pkg
 	if out, err := replacer.CombinedOutput(); err != nil {
 		t.Fatalf("failed to replace binding test dependency to current source tree: %v\n%s", err, out)
 	}
+	tidier := exec.Command(gocmd, "mod", "tidy")
+	tidier.Dir = pkg
+	if out, err := tidier.CombinedOutput(); err != nil {
+		t.Fatalf("failed to tidy Go module file: %v\n%s", err, out)
+	}
 	// Test the entire package and report any failures
 	cmd := exec.Command(gocmd, "test", "-v", "-count", "1")
 	cmd.Dir = pkg
--- a/accounts/abi/bind/template.go
+++ b/accounts/abi/bind/template.go
@@ -30,7 +30,7 @@ type tmplData struct {
 type tmplContract struct {
 	Type        string                 // Type name of the main contract binding
 	InputABI    string                 // JSON ABI used as the input to generate the binding from
-	InputBin    string                 // Optional EVM bytecode used to denetare deploy code from
+	InputBin    string                 // Optional EVM bytecode used to generate deploy code from
 	FuncSigs    map[string]string      // Optional map: string signature -> 4-byte signature
 	Constructor abi.Method             // Contract constructor for deploy parametrization
 	Calls       map[string]*tmplMethod // Contract calls that only read state data
@@ -50,7 +50,8 @@ type tmplMethod struct {
 	Structured bool       // Whether the returns should be accumulated into a struct
 }

-// tmplEvent is a wrapper around an a
+// tmplEvent is a wrapper around an abi.Event that contains a few preprocessed
+// and cached data fields.
 type tmplEvent struct {
 	Original   abi.Event // Original event as parsed by the abi package
 	Normalized abi.Event // Normalized version of the parsed fields
@@ -64,7 +65,7 @@ type tmplField struct {
 	SolKind abi.Type // Raw abi type information
 }

-// tmplStruct is a wrapper around an abi.tuple contains an auto-generated
+// tmplStruct is a wrapper around an abi.tuple and contains an auto-generated
 // struct name.
 type tmplStruct struct {
 	Name   string       // Auto-generated struct name(before solidity v0.5.11) or raw name.
@@ -78,8 +79,8 @@ var tmplSource = map[Lang]string{
 	LangJava: tmplSourceJava,
 }

-// tmplSourceGo is the Go source template use to generate the contract binding
-// based on.
+// tmplSourceGo is the Go source template that the generated Go contract binding
+// is based on.
 const tmplSourceGo = `
 // Code generated - DO NOT EDIT.
 // This file is a generated binding and any manual changes will be lost.
@@ -260,7 +261,7 @@ var (
 	// sets the output to result. The result type might be a single field for simple
 	// returns, a slice of interfaces for anonymous returns and a struct for named
 	// returns.
-	func (_{{$contract.Type}} *{{$contract.Type}}Raw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+	func (_{{$contract.Type}} *{{$contract.Type}}Raw) Call(opts *bind.CallOpts, result *[]interface{}, method string, params ...interface{}) error {
 		return _{{$contract.Type}}.Contract.{{$contract.Type}}Caller.contract.Call(opts, result, method, params...)
 	}

@@ -279,7 +280,7 @@ var (
 	// sets the output to result. The result type might be a single field for simple
 	// returns, a slice of interfaces for anonymous returns and a struct for named
 	// returns.
-	func (_{{$contract.Type}} *{{$contract.Type}}CallerRaw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+	func (_{{$contract.Type}} *{{$contract.Type}}CallerRaw) Call(opts *bind.CallOpts, result *[]interface{}, method string, params ...interface{}) error {
 		return _{{$contract.Type}}.Contract.contract.Call(opts, result, method, params...)
 	}

@@ -299,19 +300,26 @@ var (
 		//
 		// Solidity: {{.Original.String}}
 		func (_{{$contract.Type}} *{{$contract.Type}}Caller) {{.Normalized.Name}}(opts *bind.CallOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type $structs}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}};{{end}} },{{else}}{{range .Normalized.Outputs}}{{bindtype .Type $structs}},{{end}}{{end}} error) {
-			{{if .Structured}}ret := new(struct{
-				{{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}}
-				{{end}}
-			}){{else}}var (
-				{{range $i, $_ := .Normalized.Outputs}}ret{{$i}} = new({{bindtype .Type $structs}})
-				{{end}}
-			){{end}}
-			out := {{if .Structured}}ret{{else}}{{if eq (len .Normalized.Outputs) 1}}ret0{{else}}&[]interface{}{
-				{{range $i, $_ := .Normalized.Outputs}}ret{{$i}},
-				{{end}}
-			}{{end}}{{end}}
-			err := _{{$contract.Type}}.contract.Call(opts, out, "{{.Original.Name}}" {{range .Normalized.Inputs}}, {{.Name}}{{end}})
-			return {{if .Structured}}*ret,{{else}}{{range $i, $_ := .Normalized.Outputs}}*ret{{$i}},{{end}}{{end}} err
+			var out []interface{}
+			err := _{{$contract.Type}}.contract.Call(opts, &out, "{{.Original.Name}}" {{range .Normalized.Inputs}}, {{.Name}}{{end}})
+			{{if .Structured}}
+			outstruct := new(struct{ {{range .Normalized.Outputs}} {{.Name}} {{bindtype .Type $structs}}; {{end}} })
+			if err != nil {
+				return *outstruct, err
+			}
+			{{range $i, $t := .Normalized.Outputs}} 
+			outstruct.{{.Name}} = *abi.ConvertType(out[{{$i}}], new({{bindtype .Type $structs}})).(*{{bindtype .Type $structs}}){{end}}
+
+			return *outstruct, err
+			{{else}}
+			if err != nil {
+				return {{range $i, $_ := .Normalized.Outputs}}*new({{bindtype .Type $structs}}), {{end}} err
+			}
+			{{range $i, $t := .Normalized.Outputs}}
+			out{{$i}} := *abi.ConvertType(out[{{$i}}], new({{bindtype .Type $structs}})).(*{{bindtype .Type $structs}}){{end}}
+			
+			return {{range $i, $t := .Normalized.Outputs}}out{{$i}}, {{end}} err
+			{{end}}
 		}

 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.ID}}.
@@ -536,6 +544,7 @@ var (
 			if err := _{{$contract.Type}}.contract.UnpackLog(event, "{{.Original.Name}}", log); err != nil {
 				return nil, err
 			}
+			event.Raw = log
 			return event, nil
 		}

@@ -543,8 +552,8 @@ var (
 {{end}}
 `

-// tmplSourceJava is the Java source template use to generate the contract binding
-// based on.
+// tmplSourceJava is the Java source template that the generated Java contract binding
+// is based on.
 const tmplSourceJava = `
 // This file is an automatically generated Java binding. Do not modify as any
 // change will likely be lost upon the next re-generation!
--- a/accounts/abi/error.go
+++ b/accounts/abi/error.go
@@ -52,7 +52,7 @@ func sliceTypeCheck(t Type, val reflect.Value) error {
 		}
 	}

-	if elemKind := val.Type().Elem().Kind(); elemKind != t.Elem.GetType().Kind() {
+	if val.Type().Elem().Kind() != t.Elem.GetType().Kind() {
 		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), val.Type())
 	}
 	return nil
--- a/accounts/abi/event.go
+++ b/accounts/abi/event.go
@@ -32,7 +32,7 @@ type Event struct {
 	// the raw name and a suffix will be added in the case of a event overload.
 	//
 	// e.g.
-	// There are two events have same name:
+	// These are two events that have the same name:
 	// * foo(int,int)
 	// * foo(uint,uint)
 	// The event name of the first one wll be resolved as foo while the second one
--- a/accounts/abi/event_test.go
+++ b/accounts/abi/event_test.go
@@ -147,10 +147,6 @@ func TestEventString(t *testing.T) {
 // TestEventMultiValueWithArrayUnpack verifies that array fields will be counted after parsing array.
 func TestEventMultiValueWithArrayUnpack(t *testing.T) {
 	definition := `[{"name": "test", "type": "event", "inputs": [{"indexed": false, "name":"value1", "type":"uint8[2]"},{"indexed": false, "name":"value2", "type":"uint8"}]}]`
-	type testStruct struct {
-		Value1 [2]uint8
-		Value2 uint8
-	}
 	abi, err := JSON(strings.NewReader(definition))
 	require.NoError(t, err)
 	var b bytes.Buffer
@@ -158,10 +154,10 @@ func TestEventMultiValueWithArrayUnpack(t *testing.T) {
 	for ; i <= 3; i++ {
 		b.Write(packNum(reflect.ValueOf(i)))
 	}
-	var rst testStruct
-	require.NoError(t, abi.Unpack(&rst, "test", b.Bytes()))
-	require.Equal(t, [2]uint8{1, 2}, rst.Value1)
-	require.Equal(t, uint8(3), rst.Value2)
+	unpacked, err := abi.Unpack("test", b.Bytes())
+	require.NoError(t, err)
+	require.Equal(t, [2]uint8{1, 2}, unpacked[0])
+	require.Equal(t, uint8(3), unpacked[1])
 }

 func TestEventTupleUnpack(t *testing.T) {
@@ -351,14 +347,14 @@ func unpackTestEventData(dest interface{}, hexData string, jsonEvent []byte, ass
 	var e Event
 	assert.NoError(json.Unmarshal(jsonEvent, &e), "Should be able to unmarshal event ABI")
 	a := ABI{Events: map[string]Event{"e": e}}
-	return a.Unpack(dest, "e", data)
+	return a.UnpackIntoInterface(dest, "e", data)
 }

 // TestEventUnpackIndexed verifies that indexed field will be skipped by event decoder.
 func TestEventUnpackIndexed(t *testing.T) {
 	definition := `[{"name": "test", "type": "event", "inputs": [{"indexed": true, "name":"value1", "type":"uint8"},{"indexed": false, "name":"value2", "type":"uint8"}]}]`
 	type testStruct struct {
-		Value1 uint8
+		Value1 uint8 // indexed
 		Value2 uint8
 	}
 	abi, err := JSON(strings.NewReader(definition))
@@ -366,16 +362,16 @@ func TestEventUnpackIndexed(t *testing.T) {
 	var b bytes.Buffer
 	b.Write(packNum(reflect.ValueOf(uint8(8))))
 	var rst testStruct
-	require.NoError(t, abi.Unpack(&rst, "test", b.Bytes()))
+	require.NoError(t, abi.UnpackIntoInterface(&rst, "test", b.Bytes()))
 	require.Equal(t, uint8(0), rst.Value1)
 	require.Equal(t, uint8(8), rst.Value2)
 }

-// TestEventIndexedWithArrayUnpack verifies that decoder will not overlow when static array is indexed input.
+// TestEventIndexedWithArrayUnpack verifies that decoder will not overflow when static array is indexed input.
 func TestEventIndexedWithArrayUnpack(t *testing.T) {
 	definition := `[{"name": "test", "type": "event", "inputs": [{"indexed": true, "name":"value1", "type":"uint8[2]"},{"indexed": false, "name":"value2", "type":"string"}]}]`
 	type testStruct struct {
-		Value1 [2]uint8
+		Value1 [2]uint8 // indexed
 		Value2 string
 	}
 	abi, err := JSON(strings.NewReader(definition))
@@ -388,7 +384,7 @@ func TestEventIndexedWithArrayUnpack(t *testing.T) {
 	b.Write(common.RightPadBytes([]byte(stringOut), 32))

 	var rst testStruct
-	require.NoError(t, abi.Unpack(&rst, "test", b.Bytes()))
+	require.NoError(t, abi.UnpackIntoInterface(&rst, "test", b.Bytes()))
 	require.Equal(t, [2]uint8{0, 0}, rst.Value1)
 	require.Equal(t, stringOut, rst.Value2)
 }
--- a/accounts/abi/method.go
+++ b/accounts/abi/method.go
@@ -45,7 +45,7 @@ const (
 // If the method is `Const` no transaction needs to be created for this
 // particular Method call. It can easily be simulated using a local VM.
 // For example a `Balance()` method only needs to retrieve something
-// from the storage and therefore requires no Tx to be send to the
+// from the storage and therefore requires no Tx to be sent to the
 // network. A method such as `Transact` does require a Tx and thus will
 // be flagged `false`.
 // Input specifies the required input parameters for this gives method.
@@ -54,7 +54,7 @@ type Method struct {
 	// the raw name and a suffix will be added in the case of a function overload.
 	//
 	// e.g.
-	// There are two functions have same name:
+	// These are two functions that have the same name:
 	// * foo(int,int)
 	// * foo(uint,uint)
 	// The method name of the first one will be resolved as foo while the second one
--- a/accounts/abi/pack.go
+++ b/accounts/abi/pack.go
@@ -17,6 +17,8 @@
 package abi

 import (
+	"errors"
+	"fmt"
 	"math/big"
 	"reflect"

@@ -25,7 +27,7 @@ import (
 )

 // packBytesSlice packs the given bytes as [L, V] as the canonical representation
-// bytes slice
+// bytes slice.
 func packBytesSlice(bytes []byte, l int) []byte {
 	len := packNum(reflect.ValueOf(l))
 	return append(len, common.RightPadBytes(bytes, (l+31)/32*32)...)
@@ -33,39 +35,42 @@ func packBytesSlice(bytes []byte, l int) []byte {

 // packElement packs the given reflect value according to the abi specification in
 // t.
-func packElement(t Type, reflectValue reflect.Value) []byte {
+func packElement(t Type, reflectValue reflect.Value) ([]byte, error) {
 	switch t.T {
 	case IntTy, UintTy:
-		return packNum(reflectValue)
+		return packNum(reflectValue), nil
 	case StringTy:
-		return packBytesSlice([]byte(reflectValue.String()), reflectValue.Len())
+		return packBytesSlice([]byte(reflectValue.String()), reflectValue.Len()), nil
 	case AddressTy:
 		if reflectValue.Kind() == reflect.Array {
 			reflectValue = mustArrayToByteSlice(reflectValue)
 		}

-		return common.LeftPadBytes(reflectValue.Bytes(), 32)
+		return common.LeftPadBytes(reflectValue.Bytes(), 32), nil
 	case BoolTy:
 		if reflectValue.Bool() {
-			return math.PaddedBigBytes(common.Big1, 32)
+			return math.PaddedBigBytes(common.Big1, 32), nil
 		}
-		return math.PaddedBigBytes(common.Big0, 32)
+		return math.PaddedBigBytes(common.Big0, 32), nil
 	case BytesTy:
 		if reflectValue.Kind() == reflect.Array {
 			reflectValue = mustArrayToByteSlice(reflectValue)
 		}
-		return packBytesSlice(reflectValue.Bytes(), reflectValue.Len())
+		if reflectValue.Type() != reflect.TypeOf([]byte{}) {
+			return []byte{}, errors.New("Bytes type is neither slice nor array")
+		}
+		return packBytesSlice(reflectValue.Bytes(), reflectValue.Len()), nil
 	case FixedBytesTy, FunctionTy:
 		if reflectValue.Kind() == reflect.Array {
 			reflectValue = mustArrayToByteSlice(reflectValue)
 		}
-		return common.RightPadBytes(reflectValue.Bytes(), 32)
+		return common.RightPadBytes(reflectValue.Bytes(), 32), nil
 	default:
-		panic("abi: fatal error")
+		return []byte{}, fmt.Errorf("Could not pack element, unknown type: %v", t.T)
 	}
 }

-// packNum packs the given number (using the reflect value) and will cast it to appropriate number representation
+// packNum packs the given number (using the reflect value) and will cast it to appropriate number representation.
 func packNum(value reflect.Value) []byte {
 	switch kind := value.Kind(); kind {
 	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
@@ -77,5 +82,4 @@ func packNum(value reflect.Value) []byte {
 	default:
 		panic("abi: fatal error")
 	}
-
 }
--- a/accounts/abi/pack_test.go
+++ b/accounts/abi/pack_test.go
@@ -44,18 +44,7 @@ func TestPack(t *testing.T) {
 				t.Fatalf("invalid ABI definition %s, %v", inDef, err)
 			}
 			var packed []byte
-			if reflect.TypeOf(test.unpacked).Kind() != reflect.Struct {
-				packed, err = inAbi.Pack("method", test.unpacked)
-			} else {
-				// if want is a struct we need to use the components.
-				elem := reflect.ValueOf(test.unpacked)
-				var values []interface{}
-				for i := 0; i < elem.NumField(); i++ {
-					field := elem.Field(i)
-					values = append(values, field.Interface())
-				}
-				packed, err = inAbi.Pack("method", values...)
-			}
+			packed, err = inAbi.Pack("method", test.unpacked)

 			if err != nil {
 				t.Fatalf("test %d (%v) failed: %v", i, test.def, err)
--- a/accounts/abi/packing_test.go
+++ b/accounts/abi/packing_test.go
@@ -620,7 +620,7 @@ var packUnpackTests = []packUnpackTest{

 	{
 		def:      `[{"type": "bytes32[]"}]`,
-		unpacked: []common.Hash{{1}, {2}},
+		unpacked: [][32]byte{{1}, {2}},
 		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
 			"0000000000000000000000000000000000000000000000000000000000000002" +
 			"0100000000000000000000000000000000000000000000000000000000000000" +
@@ -722,7 +722,7 @@ var packUnpackTests = []packUnpackTest{
 	},
 	// struct outputs
 	{
-		def: `[{"name":"int1","type":"int256"},{"name":"int2","type":"int256"}]`,
+		def: `[{"components": [{"name":"int1","type":"int256"},{"name":"int2","type":"int256"}], "type":"tuple"}]`,
 		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
 			"0000000000000000000000000000000000000000000000000000000000000002",
 		unpacked: struct {
@@ -731,28 +731,28 @@ var packUnpackTests = []packUnpackTest{
 		}{big.NewInt(1), big.NewInt(2)},
 	},
 	{
-		def:    `[{"name":"int_one","type":"int256"}]`,
+		def:    `[{"components": [{"name":"int_one","type":"int256"}], "type":"tuple"}]`,
 		packed: "0000000000000000000000000000000000000000000000000000000000000001",
 		unpacked: struct {
 			IntOne *big.Int
 		}{big.NewInt(1)},
 	},
 	{
-		def:    `[{"name":"int__one","type":"int256"}]`,
+		def:    `[{"components": [{"name":"int__one","type":"int256"}], "type":"tuple"}]`,
 		packed: "0000000000000000000000000000000000000000000000000000000000000001",
 		unpacked: struct {
 			IntOne *big.Int
 		}{big.NewInt(1)},
 	},
 	{
-		def:    `[{"name":"int_one_","type":"int256"}]`,
+		def:    `[{"components": [{"name":"int_one_","type":"int256"}], "type":"tuple"}]`,
 		packed: "0000000000000000000000000000000000000000000000000000000000000001",
 		unpacked: struct {
 			IntOne *big.Int
 		}{big.NewInt(1)},
 	},
 	{
-		def: `[{"name":"int_one","type":"int256"}, {"name":"intone","type":"int256"}]`,
+		def: `[{"components": [{"name":"int_one","type":"int256"}, {"name":"intone","type":"int256"}], "type":"tuple"}]`,
 		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
 			"0000000000000000000000000000000000000000000000000000000000000002",
 		unpacked: struct {
@@ -831,11 +831,11 @@ var packUnpackTests = []packUnpackTest{
 	},
 	{
 		// static tuple
-		def: `[{"name":"a","type":"int64"}, 
+		def: `[{"components": [{"name":"a","type":"int64"}, 
 		{"name":"b","type":"int256"}, 
 		{"name":"c","type":"int256"}, 
 		{"name":"d","type":"bool"},
-		{"name":"e","type":"bytes32[3][2]"}]`,
+		{"name":"e","type":"bytes32[3][2]"}], "type":"tuple"}]`,
 		unpacked: struct {
 			A int64
 			B *big.Int
@@ -855,21 +855,22 @@ var packUnpackTests = []packUnpackTest{
 			"0500000000000000000000000000000000000000000000000000000000000000", // struct[e] array[1][2]
 	},
 	{
-		def: `[{"name":"a","type":"string"}, 
+		def: `[{"components": [{"name":"a","type":"string"}, 
 		{"name":"b","type":"int64"}, 
 		{"name":"c","type":"bytes"}, 
 		{"name":"d","type":"string[]"},
 		{"name":"e","type":"int256[]"},
-		{"name":"f","type":"address[]"}]`,
+		{"name":"f","type":"address[]"}], "type":"tuple"}]`,
 		unpacked: struct {
-			FieldA string `abi:"a"` // Test whether abi tag works
-			FieldB int64  `abi:"b"`
-			C      []byte
-			D      []string
-			E      []*big.Int
-			F      []common.Address
+			A string
+			B int64
+			C []byte
+			D []string
+			E []*big.Int
+			F []common.Address
 		}{"foobar", 1, []byte{1}, []string{"foo", "bar"}, []*big.Int{big.NewInt(1), big.NewInt(-1)}, []common.Address{{1}, {2}}},
-		packed: "00000000000000000000000000000000000000000000000000000000000000c0" + // struct[a] offset
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" + // struct a
+			"00000000000000000000000000000000000000000000000000000000000000c0" + // struct[a] offset
 			"0000000000000000000000000000000000000000000000000000000000000001" + // struct[b]
 			"0000000000000000000000000000000000000000000000000000000000000100" + // struct[c] offset
 			"0000000000000000000000000000000000000000000000000000000000000140" + // struct[d] offset
@@ -894,23 +895,24 @@ var packUnpackTests = []packUnpackTest{
 			"0000000000000000000000000200000000000000000000000000000000000000", // common.Address{2}
 	},
 	{
-		def: `[{"components": [{"name": "a","type": "uint256"},	
+		def: `[{"components": [{ "type": "tuple","components": [{"name": "a","type": "uint256"},	
 							{"name": "b","type": "uint256[]"}],	
 							"name": "a","type": "tuple"},
-							{"name": "b","type": "uint256[]"}]`,
+							{"name": "b","type": "uint256[]"}],  "type": "tuple"}]`,
 		unpacked: struct {
 			A struct {
-				FieldA *big.Int `abi:"a"`
-				B      []*big.Int
+				A *big.Int
+				B []*big.Int
 			}
 			B []*big.Int
 		}{
 			A: struct {
-				FieldA *big.Int `abi:"a"` // Test whether abi tag works for nested tuple
-				B      []*big.Int
+				A *big.Int
+				B []*big.Int
 			}{big.NewInt(1), []*big.Int{big.NewInt(1), big.NewInt(2)}},
 			B: []*big.Int{big.NewInt(1), big.NewInt(2)}},
-		packed: "0000000000000000000000000000000000000000000000000000000000000040" + // a offset
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" + // struct a
+			"0000000000000000000000000000000000000000000000000000000000000040" + // a offset
 			"00000000000000000000000000000000000000000000000000000000000000e0" + // b offset
 			"0000000000000000000000000000000000000000000000000000000000000001" + // a.a value
 			"0000000000000000000000000000000000000000000000000000000000000040" + // a.b offset
--- a/accounts/abi/reflect.go
+++ b/accounts/abi/reflect.go
@@ -24,6 +24,29 @@ import (
 	"strings"
 )

+// ConvertType converts an interface of a runtime type into a interface of the
+// given type
+// e.g. turn
+// var fields []reflect.StructField
+// fields = append(fields, reflect.StructField{
+// 		Name: "X",
+//		Type: reflect.TypeOf(new(big.Int)),
+//		Tag:  reflect.StructTag("json:\"" + "x" + "\""),
+// }
+// into
+// type TupleT struct { X *big.Int }
+func ConvertType(in interface{}, proto interface{}) interface{} {
+	protoType := reflect.TypeOf(proto)
+	if reflect.TypeOf(in).ConvertibleTo(protoType) {
+		return reflect.ValueOf(in).Convert(protoType).Interface()
+	}
+	// Use set as a last ditch effort
+	if err := set(reflect.ValueOf(proto), reflect.ValueOf(in)); err != nil {
+		panic(err)
+	}
+	return proto
+}
+
 // indirect recursively dereferences the value until it either gets the value
 // or finds a big.Int
 func indirect(v reflect.Value) reflect.Value {
@@ -61,7 +84,7 @@ func reflectIntType(unsigned bool, size int) reflect.Type {
 	return reflect.TypeOf(&big.Int{})
 }

-// mustArrayToBytesSlice creates a new byte slice with the exact same size as value
+// mustArrayToByteSlice creates a new byte slice with the exact same size as value
 // and copies the bytes in value to the new slice.
 func mustArrayToByteSlice(value reflect.Value) reflect.Value {
 	slice := reflect.MakeSlice(reflect.TypeOf([]byte{}), value.Len(), value.Len())
@@ -119,6 +142,9 @@ func setSlice(dst, src reflect.Value) error {
 }

 func setArray(dst, src reflect.Value) error {
+	if src.Kind() == reflect.Ptr {
+		return set(dst, indirect(src))
+	}
 	array := reflect.New(dst.Type()).Elem()
 	min := src.Len()
 	if src.Len() > dst.Len() {
--- a/accounts/abi/reflect_test.go
+++ b/accounts/abi/reflect_test.go
@@ -17,6 +17,7 @@
 package abi

 import (
+	"math/big"
 	"reflect"
 	"testing"
 )
@@ -189,3 +190,72 @@ func TestReflectNameToStruct(t *testing.T) {
 		})
 	}
 }
+
+func TestConvertType(t *testing.T) {
+	// Test Basic Struct
+	type T struct {
+		X *big.Int
+		Y *big.Int
+	}
+	// Create on-the-fly structure
+	var fields []reflect.StructField
+	fields = append(fields, reflect.StructField{
+		Name: "X",
+		Type: reflect.TypeOf(new(big.Int)),
+		Tag:  "json:\"" + "x" + "\"",
+	})
+	fields = append(fields, reflect.StructField{
+		Name: "Y",
+		Type: reflect.TypeOf(new(big.Int)),
+		Tag:  "json:\"" + "y" + "\"",
+	})
+	val := reflect.New(reflect.StructOf(fields))
+	val.Elem().Field(0).Set(reflect.ValueOf(big.NewInt(1)))
+	val.Elem().Field(1).Set(reflect.ValueOf(big.NewInt(2)))
+	// ConvertType
+	out := *ConvertType(val.Interface(), new(T)).(*T)
+	if out.X.Cmp(big.NewInt(1)) != 0 {
+		t.Errorf("ConvertType failed, got %v want %v", out.X, big.NewInt(1))
+	}
+	if out.Y.Cmp(big.NewInt(2)) != 0 {
+		t.Errorf("ConvertType failed, got %v want %v", out.Y, big.NewInt(2))
+	}
+	// Slice Type
+	val2 := reflect.MakeSlice(reflect.SliceOf(reflect.StructOf(fields)), 2, 2)
+	val2.Index(0).Field(0).Set(reflect.ValueOf(big.NewInt(1)))
+	val2.Index(0).Field(1).Set(reflect.ValueOf(big.NewInt(2)))
+	val2.Index(1).Field(0).Set(reflect.ValueOf(big.NewInt(3)))
+	val2.Index(1).Field(1).Set(reflect.ValueOf(big.NewInt(4)))
+	out2 := *ConvertType(val2.Interface(), new([]T)).(*[]T)
+	if out2[0].X.Cmp(big.NewInt(1)) != 0 {
+		t.Errorf("ConvertType failed, got %v want %v", out2[0].X, big.NewInt(1))
+	}
+	if out2[0].Y.Cmp(big.NewInt(2)) != 0 {
+		t.Errorf("ConvertType failed, got %v want %v", out2[1].Y, big.NewInt(2))
+	}
+	if out2[1].X.Cmp(big.NewInt(3)) != 0 {
+		t.Errorf("ConvertType failed, got %v want %v", out2[0].X, big.NewInt(1))
+	}
+	if out2[1].Y.Cmp(big.NewInt(4)) != 0 {
+		t.Errorf("ConvertType failed, got %v want %v", out2[1].Y, big.NewInt(2))
+	}
+	// Array Type
+	val3 := reflect.New(reflect.ArrayOf(2, reflect.StructOf(fields)))
+	val3.Elem().Index(0).Field(0).Set(reflect.ValueOf(big.NewInt(1)))
+	val3.Elem().Index(0).Field(1).Set(reflect.ValueOf(big.NewInt(2)))
+	val3.Elem().Index(1).Field(0).Set(reflect.ValueOf(big.NewInt(3)))
+	val3.Elem().Index(1).Field(1).Set(reflect.ValueOf(big.NewInt(4)))
+	out3 := *ConvertType(val3.Interface(), new([2]T)).(*[2]T)
+	if out3[0].X.Cmp(big.NewInt(1)) != 0 {
+		t.Errorf("ConvertType failed, got %v want %v", out3[0].X, big.NewInt(1))
+	}
+	if out3[0].Y.Cmp(big.NewInt(2)) != 0 {
+		t.Errorf("ConvertType failed, got %v want %v", out3[1].Y, big.NewInt(2))
+	}
+	if out3[1].X.Cmp(big.NewInt(3)) != 0 {
+		t.Errorf("ConvertType failed, got %v want %v", out3[0].X, big.NewInt(1))
+	}
+	if out3[1].Y.Cmp(big.NewInt(4)) != 0 {
+		t.Errorf("ConvertType failed, got %v want %v", out3[1].Y, big.NewInt(2))
+	}
+}
--- a/accounts/abi/topics.go
+++ b/accounts/abi/topics.go
@@ -102,7 +102,7 @@ func genIntType(rule int64, size uint) []byte {
 	var topic [common.HashLength]byte
 	if rule < 0 {
 		// if a rule is negative, we need to put it into two's complement.
-		// extended to common.Hashlength bytes.
+		// extended to common.HashLength bytes.
 		topic = [common.HashLength]byte{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}
 	}
 	for i := uint(0); i < size; i++ {
@@ -120,7 +120,7 @@ func ParseTopics(out interface{}, fields Arguments, topics []common.Hash) error
 		})
 }

-// ParseTopicsIntoMap converts the indexed topic field-value pairs into map key-value pairs
+// ParseTopicsIntoMap converts the indexed topic field-value pairs into map key-value pairs.
 func ParseTopicsIntoMap(out map[string]interface{}, fields Arguments, topics []common.Hash) error {
 	return parseTopicWithSetter(fields, topics,
 		func(arg Argument, reconstr interface{}) {
--- a/accounts/abi/type.go
+++ b/accounts/abi/type.go
@@ -44,7 +44,7 @@ const (
 	FunctionTy
 )

-// Type is the reflection of the supported argument type
+// Type is the reflection of the supported argument type.
 type Type struct {
 	Elem *Type
 	Size int
@@ -264,7 +264,7 @@ func overloadedArgName(rawName string, names map[string]string) (string, error)
 	return fieldName, nil
 }

-// String implements Stringer
+// String implements Stringer.
 func (t Type) String() (out string) {
 	return t.stringKind
 }
@@ -346,7 +346,7 @@ func (t Type) pack(v reflect.Value) ([]byte, error) {
 		return append(ret, tail...), nil

 	default:
-		return packElement(t, v), nil
+		return packElement(t, v)
 	}
 }

--- a/accounts/abi/type_test.go
+++ b/accounts/abi/type_test.go
@@ -255,7 +255,7 @@ func TestTypeCheck(t *testing.T) {
 		{"bytes", nil, [2]byte{0, 1}, "abi: cannot use array as type slice as argument"},
 		{"bytes", nil, common.Hash{1}, "abi: cannot use array as type slice as argument"},
 		{"string", nil, "hello world", ""},
-		{"string", nil, string(""), ""},
+		{"string", nil, "", ""},
 		{"string", nil, []byte{}, "abi: cannot use slice as type string as argument"},
 		{"bytes32[]", nil, [][32]byte{{}}, ""},
 		{"function", nil, [24]byte{}, ""},
--- a/accounts/abi/unpack.go
+++ b/accounts/abi/unpack.go
@@ -26,13 +26,13 @@ import (
 )

 var (
-	// MaxUint256 is the maximum value that can be represented by a uint256
+	// MaxUint256 is the maximum value that can be represented by a uint256.
 	MaxUint256 = new(big.Int).Sub(new(big.Int).Lsh(common.Big1, 256), common.Big1)
-	// MaxInt256 is the maximum value that can be represented by a int256
+	// MaxInt256 is the maximum value that can be represented by a int256.
 	MaxInt256 = new(big.Int).Sub(new(big.Int).Lsh(common.Big1, 255), common.Big1)
 )

-// ReadInteger reads the integer based on its kind and returns the appropriate value
+// ReadInteger reads the integer based on its kind and returns the appropriate value.
 func ReadInteger(typ Type, b []byte) interface{} {
 	if typ.T == UintTy {
 		switch typ.Size {
@@ -73,7 +73,7 @@ func ReadInteger(typ Type, b []byte) interface{} {
 	}
 }

-// reads a bool
+// readBool reads a bool.
 func readBool(word []byte) (bool, error) {
 	for _, b := range word[:31] {
 		if b != 0 {
@@ -91,7 +91,8 @@ func readBool(word []byte) (bool, error) {
 }

 // A function type is simply the address with the function selection signature at the end.
-// This enforces that standard by always presenting it as a 24-array (address + sig = 24 bytes)
+//
+// readFunctionType enforces that standard by always presenting it as a 24-array (address + sig = 24 bytes)
 func readFunctionType(t Type, word []byte) (funcTy [24]byte, err error) {
 	if t.T != FunctionTy {
 		return [24]byte{}, fmt.Errorf("abi: invalid type in call to make function type byte array")
@@ -104,7 +105,7 @@ func readFunctionType(t Type, word []byte) (funcTy [24]byte, err error) {
 	return
 }

-// ReadFixedBytes uses reflection to create a fixed array to be read from
+// ReadFixedBytes uses reflection to create a fixed array to be read from.
 func ReadFixedBytes(t Type, word []byte) (interface{}, error) {
 	if t.T != FixedBytesTy {
 		return nil, fmt.Errorf("abi: invalid type in call to make fixed byte array")
@@ -117,7 +118,7 @@ func ReadFixedBytes(t Type, word []byte) (interface{}, error) {

 }

-// iteratively unpack elements
+// forEachUnpack iteratively unpack elements.
 func forEachUnpack(t Type, output []byte, start, size int) (interface{}, error) {
 	if size < 0 {
 		return nil, fmt.Errorf("cannot marshal input to array, size is negative (%d)", size)
@@ -224,7 +225,10 @@ func toGoType(index int, t Type, output []byte) (interface{}, error) {
 		return forEachUnpack(t, output[begin:], 0, length)
 	case ArrayTy:
 		if isDynamicType(*t.Elem) {
-			offset := int64(binary.BigEndian.Uint64(returnOutput[len(returnOutput)-8:]))
+			offset := binary.BigEndian.Uint64(returnOutput[len(returnOutput)-8:])
+			if offset > uint64(len(output)) {
+				return nil, fmt.Errorf("abi: toGoType offset greater than output length: offset: %d, len(output): %d", offset, len(output))
+			}
 			return forEachUnpack(t, output[offset:], 0, t.Size)
 		}
 		return forEachUnpack(t, output[index:], 0, t.Size)
@@ -249,7 +253,7 @@ func toGoType(index int, t Type, output []byte) (interface{}, error) {
 	}
 }

-// interprets a 32 byte slice as an offset and then determines which indice to look to decode the type.
+// lengthPrefixPointsTo interprets a 32 byte slice as an offset and then determines which indices to look to decode the type.
 func lengthPrefixPointsTo(index int, output []byte) (start int, length int, err error) {
 	bigOffsetEnd := big.NewInt(0).SetBytes(output[index : index+32])
 	bigOffsetEnd.Add(bigOffsetEnd, common.Big32)
--- a/accounts/abi/unpack_test.go
+++ b/accounts/abi/unpack_test.go
@@ -44,15 +44,13 @@ func TestUnpack(t *testing.T) {
 			if err != nil {
 				t.Fatalf("invalid hex %s: %v", test.packed, err)
 			}
-			outptr := reflect.New(reflect.TypeOf(test.unpacked))
-			err = abi.Unpack(outptr.Interface(), "method", encb)
+			out, err := abi.Unpack("method", encb)
 			if err != nil {
 				t.Errorf("test %d (%v) failed: %v", i, test.def, err)
 				return
 			}
-			out := outptr.Elem().Interface()
-			if !reflect.DeepEqual(test.unpacked, out) {
-				t.Errorf("test %d (%v) failed: expected %v, got %v", i, test.def, test.unpacked, out)
+			if !reflect.DeepEqual(test.unpacked, ConvertType(out[0], test.unpacked)) {
+				t.Errorf("test %d (%v) failed: expected %v, got %v", i, test.def, test.unpacked, out[0])
 			}
 		})
 	}
@@ -221,7 +219,7 @@ func TestLocalUnpackTests(t *testing.T) {
 				t.Fatalf("invalid hex %s: %v", test.enc, err)
 			}
 			outptr := reflect.New(reflect.TypeOf(test.want))
-			err = abi.Unpack(outptr.Interface(), "method", encb)
+			err = abi.UnpackIntoInterface(outptr.Interface(), "method", encb)
 			if err := test.checkError(err); err != nil {
 				t.Errorf("test %d (%v) failed: %v", i, test.def, err)
 				return
@@ -234,7 +232,7 @@ func TestLocalUnpackTests(t *testing.T) {
 	}
 }

-func TestUnpackSetDynamicArrayOutput(t *testing.T) {
+func TestUnpackIntoInterfaceSetDynamicArrayOutput(t *testing.T) {
 	abi, err := JSON(strings.NewReader(`[{"constant":true,"inputs":[],"name":"testDynamicFixedBytes15","outputs":[{"name":"","type":"bytes15[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"testDynamicFixedBytes32","outputs":[{"name":"","type":"bytes32[]"}],"payable":false,"stateMutability":"view","type":"function"}]`))
 	if err != nil {
 		t.Fatal(err)
@@ -249,7 +247,7 @@ func TestUnpackSetDynamicArrayOutput(t *testing.T) {
 	)

 	// test 32
-	err = abi.Unpack(&out32, "testDynamicFixedBytes32", marshalledReturn32)
+	err = abi.UnpackIntoInterface(&out32, "testDynamicFixedBytes32", marshalledReturn32)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -266,7 +264,7 @@ func TestUnpackSetDynamicArrayOutput(t *testing.T) {
 	}

 	// test 15
-	err = abi.Unpack(&out15, "testDynamicFixedBytes32", marshalledReturn15)
+	err = abi.UnpackIntoInterface(&out15, "testDynamicFixedBytes32", marshalledReturn15)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -367,7 +365,7 @@ func TestMethodMultiReturn(t *testing.T) {
 		tc := tc
 		t.Run(tc.name, func(t *testing.T) {
 			require := require.New(t)
-			err := abi.Unpack(tc.dest, "multi", data)
+			err := abi.UnpackIntoInterface(tc.dest, "multi", data)
 			if tc.error == "" {
 				require.Nil(err, "Should be able to unpack method outputs.")
 				require.Equal(tc.expected, tc.dest)
@@ -390,7 +388,7 @@ func TestMultiReturnWithArray(t *testing.T) {

 	ret1, ret1Exp := new([3]uint64), [3]uint64{9, 9, 9}
 	ret2, ret2Exp := new(uint64), uint64(8)
-	if err := abi.Unpack(&[]interface{}{ret1, ret2}, "multi", buff.Bytes()); err != nil {
+	if err := abi.UnpackIntoInterface(&[]interface{}{ret1, ret2}, "multi", buff.Bytes()); err != nil {
 		t.Fatal(err)
 	}
 	if !reflect.DeepEqual(*ret1, ret1Exp) {
@@ -414,7 +412,7 @@ func TestMultiReturnWithStringArray(t *testing.T) {
 	ret2, ret2Exp := new(common.Address), common.HexToAddress("ab1257528b3782fb40d7ed5f72e624b744dffb2f")
 	ret3, ret3Exp := new([2]string), [2]string{"Ethereum", "Hello, Ethereum!"}
 	ret4, ret4Exp := new(bool), false
-	if err := abi.Unpack(&[]interface{}{ret1, ret2, ret3, ret4}, "multi", buff.Bytes()); err != nil {
+	if err := abi.UnpackIntoInterface(&[]interface{}{ret1, ret2, ret3, ret4}, "multi", buff.Bytes()); err != nil {
 		t.Fatal(err)
 	}
 	if !reflect.DeepEqual(*ret1, ret1Exp) {
@@ -452,7 +450,7 @@ func TestMultiReturnWithStringSlice(t *testing.T) {
 	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000065")) // output[1][1] value
 	ret1, ret1Exp := new([]string), []string{"ethereum", "go-ethereum"}
 	ret2, ret2Exp := new([]*big.Int), []*big.Int{big.NewInt(100), big.NewInt(101)}
-	if err := abi.Unpack(&[]interface{}{ret1, ret2}, "multi", buff.Bytes()); err != nil {
+	if err := abi.UnpackIntoInterface(&[]interface{}{ret1, ret2}, "multi", buff.Bytes()); err != nil {
 		t.Fatal(err)
 	}
 	if !reflect.DeepEqual(*ret1, ret1Exp) {
@@ -492,7 +490,7 @@ func TestMultiReturnWithDeeplyNestedArray(t *testing.T) {
 		{{0x411, 0x412, 0x413}, {0x421, 0x422, 0x423}},
 	}
 	ret2, ret2Exp := new(uint64), uint64(0x9876)
-	if err := abi.Unpack(&[]interface{}{ret1, ret2}, "multi", buff.Bytes()); err != nil {
+	if err := abi.UnpackIntoInterface(&[]interface{}{ret1, ret2}, "multi", buff.Bytes()); err != nil {
 		t.Fatal(err)
 	}
 	if !reflect.DeepEqual(*ret1, ret1Exp) {
@@ -531,7 +529,7 @@ func TestUnmarshal(t *testing.T) {
 	buff.Write(common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000a"))
 	buff.Write(common.Hex2Bytes("0102000000000000000000000000000000000000000000000000000000000000"))

-	err = abi.Unpack(&mixedBytes, "mixedBytes", buff.Bytes())
+	err = abi.UnpackIntoInterface(&mixedBytes, "mixedBytes", buff.Bytes())
 	if err != nil {
 		t.Error(err)
 	} else {
@@ -546,7 +544,7 @@ func TestUnmarshal(t *testing.T) {

 	// marshal int
 	var Int *big.Int
-	err = abi.Unpack(&Int, "int", common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
+	err = abi.UnpackIntoInterface(&Int, "int", common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
 	if err != nil {
 		t.Error(err)
 	}
@@ -557,7 +555,7 @@ func TestUnmarshal(t *testing.T) {

 	// marshal bool
 	var Bool bool
-	err = abi.Unpack(&Bool, "bool", common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
+	err = abi.UnpackIntoInterface(&Bool, "bool", common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
 	if err != nil {
 		t.Error(err)
 	}
@@ -574,7 +572,7 @@ func TestUnmarshal(t *testing.T) {
 	buff.Write(bytesOut)

 	var Bytes []byte
-	err = abi.Unpack(&Bytes, "bytes", buff.Bytes())
+	err = abi.UnpackIntoInterface(&Bytes, "bytes", buff.Bytes())
 	if err != nil {
 		t.Error(err)
 	}
@@ -590,7 +588,7 @@ func TestUnmarshal(t *testing.T) {
 	bytesOut = common.RightPadBytes([]byte("hello"), 64)
 	buff.Write(bytesOut)

-	err = abi.Unpack(&Bytes, "bytes", buff.Bytes())
+	err = abi.UnpackIntoInterface(&Bytes, "bytes", buff.Bytes())
 	if err != nil {
 		t.Error(err)
 	}
@@ -606,7 +604,7 @@ func TestUnmarshal(t *testing.T) {
 	bytesOut = common.RightPadBytes([]byte("hello"), 64)
 	buff.Write(bytesOut)

-	err = abi.Unpack(&Bytes, "bytes", buff.Bytes())
+	err = abi.UnpackIntoInterface(&Bytes, "bytes", buff.Bytes())
 	if err != nil {
 		t.Error(err)
 	}
@@ -616,7 +614,7 @@ func TestUnmarshal(t *testing.T) {
 	}

 	// marshal dynamic bytes output empty
-	err = abi.Unpack(&Bytes, "bytes", nil)
+	err = abi.UnpackIntoInterface(&Bytes, "bytes", nil)
 	if err == nil {
 		t.Error("expected error")
 	}
@@ -627,7 +625,7 @@ func TestUnmarshal(t *testing.T) {
 	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005"))
 	buff.Write(common.RightPadBytes([]byte("hello"), 32))

-	err = abi.Unpack(&Bytes, "bytes", buff.Bytes())
+	err = abi.UnpackIntoInterface(&Bytes, "bytes", buff.Bytes())
 	if err != nil {
 		t.Error(err)
 	}
@@ -641,7 +639,7 @@ func TestUnmarshal(t *testing.T) {
 	buff.Write(common.RightPadBytes([]byte("hello"), 32))

 	var hash common.Hash
-	err = abi.Unpack(&hash, "fixed", buff.Bytes())
+	err = abi.UnpackIntoInterface(&hash, "fixed", buff.Bytes())
 	if err != nil {
 		t.Error(err)
 	}
@@ -654,12 +652,12 @@ func TestUnmarshal(t *testing.T) {
 	// marshal error
 	buff.Reset()
 	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
-	err = abi.Unpack(&Bytes, "bytes", buff.Bytes())
+	err = abi.UnpackIntoInterface(&Bytes, "bytes", buff.Bytes())
 	if err == nil {
 		t.Error("expected error")
 	}

-	err = abi.Unpack(&Bytes, "multi", make([]byte, 64))
+	err = abi.UnpackIntoInterface(&Bytes, "multi", make([]byte, 64))
 	if err == nil {
 		t.Error("expected error")
 	}
@@ -670,7 +668,7 @@ func TestUnmarshal(t *testing.T) {
 	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000003"))
 	// marshal int array
 	var intArray [3]*big.Int
-	err = abi.Unpack(&intArray, "intArraySingle", buff.Bytes())
+	err = abi.UnpackIntoInterface(&intArray, "intArraySingle", buff.Bytes())
 	if err != nil {
 		t.Error(err)
 	}
@@ -691,7 +689,7 @@ func TestUnmarshal(t *testing.T) {
 	buff.Write(common.Hex2Bytes("0000000000000000000000000100000000000000000000000000000000000000"))

 	var outAddr []common.Address
-	err = abi.Unpack(&outAddr, "addressSliceSingle", buff.Bytes())
+	err = abi.UnpackIntoInterface(&outAddr, "addressSliceSingle", buff.Bytes())
 	if err != nil {
 		t.Fatal("didn't expect error:", err)
 	}
@@ -718,7 +716,7 @@ func TestUnmarshal(t *testing.T) {
 		A []common.Address
 		B []common.Address
 	}
-	err = abi.Unpack(&outAddrStruct, "addressSliceDouble", buff.Bytes())
+	err = abi.UnpackIntoInterface(&outAddrStruct, "addressSliceDouble", buff.Bytes())
 	if err != nil {
 		t.Fatal("didn't expect error:", err)
 	}
@@ -746,7 +744,7 @@ func TestUnmarshal(t *testing.T) {
 	buff.Reset()
 	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000100"))

-	err = abi.Unpack(&outAddr, "addressSliceSingle", buff.Bytes())
+	err = abi.UnpackIntoInterface(&outAddr, "addressSliceSingle", buff.Bytes())
 	if err == nil {
 		t.Fatal("expected error:", err)
 	}
@@ -769,7 +767,7 @@ func TestUnpackTuple(t *testing.T) {
 		B *big.Int
 	}{new(big.Int), new(big.Int)}

-	err = abi.Unpack(&v, "tuple", buff.Bytes())
+	err = abi.UnpackIntoInterface(&v, "tuple", buff.Bytes())
 	if err != nil {
 		t.Error(err)
 	} else {
@@ -841,7 +839,7 @@ func TestUnpackTuple(t *testing.T) {
 		A: big.NewInt(1),
 	}

-	err = abi.Unpack(&ret, "tuple", buff.Bytes())
+	err = abi.UnpackIntoInterface(&ret, "tuple", buff.Bytes())
 	if err != nil {
 		t.Error(err)
 	}
--- a/accounts/accounts.go
+++ b/accounts/accounts.go
@@ -21,7 +21,7 @@ import (
 	"fmt"
 	"math/big"

-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/event"
@@ -88,7 +88,7 @@ type Wallet interface {
 	// to discover non zero accounts and automatically add them to list of tracked
 	// accounts.
 	//
-	// Note, self derivaton will increment the last component of the specified path
+	// Note, self derivation will increment the last component of the specified path
 	// opposed to decending into a child path to allow discovering accounts starting
 	// from non zero components.
 	//
--- a/accounts/hd.go
+++ b/accounts/hd.go
@@ -150,3 +150,31 @@ func (path *DerivationPath) UnmarshalJSON(b []byte) error {
 	*path, err = ParseDerivationPath(dp)
 	return err
 }
+
+// DefaultIterator creates a BIP-32 path iterator, which progresses by increasing the last component:
+// i.e. m/44'/60'/0'/0/0, m/44'/60'/0'/0/1, m/44'/60'/0'/0/2, ... m/44'/60'/0'/0/N.
+func DefaultIterator(base DerivationPath) func() DerivationPath {
+	path := make(DerivationPath, len(base))
+	copy(path[:], base[:])
+	// Set it back by one, so the first call gives the first result
+	path[len(path)-1]--
+	return func() DerivationPath {
+		path[len(path)-1]++
+		return path
+	}
+}
+
+// LedgerLiveIterator creates a bip44 path iterator for Ledger Live.
+// Ledger Live increments the third component rather than the fifth component
+// i.e. m/44'/60'/0'/0/0, m/44'/60'/1'/0/0, m/44'/60'/2'/0/0, ... m/44'/60'/N'/0/0.
+func LedgerLiveIterator(base DerivationPath) func() DerivationPath {
+	path := make(DerivationPath, len(base))
+	copy(path[:], base[:])
+	// Set it back by one, so the first call gives the first result
+	path[2]--
+	return func() DerivationPath {
+		// ledgerLivePathIterator iterates on the third component
+		path[2]++
+		return path
+	}
+}
--- a/accounts/hd_test.go
+++ b/accounts/hd_test.go
@@ -17,6 +17,7 @@
 package accounts

 import (
+	"fmt"
 	"reflect"
 	"testing"
 )
@@ -77,3 +78,41 @@ func TestHDPathParsing(t *testing.T) {
 		}
 	}
 }
+
+func testDerive(t *testing.T, next func() DerivationPath, expected []string) {
+	t.Helper()
+	for i, want := range expected {
+		if have := next(); fmt.Sprintf("%v", have) != want {
+			t.Errorf("step %d, have %v, want %v", i, have, want)
+		}
+	}
+}
+
+func TestHdPathIteration(t *testing.T) {
+	testDerive(t, DefaultIterator(DefaultBaseDerivationPath),
+		[]string{
+			"m/44'/60'/0'/0/0", "m/44'/60'/0'/0/1",
+			"m/44'/60'/0'/0/2", "m/44'/60'/0'/0/3",
+			"m/44'/60'/0'/0/4", "m/44'/60'/0'/0/5",
+			"m/44'/60'/0'/0/6", "m/44'/60'/0'/0/7",
+			"m/44'/60'/0'/0/8", "m/44'/60'/0'/0/9",
+		})
+
+	testDerive(t, DefaultIterator(LegacyLedgerBaseDerivationPath),
+		[]string{
+			"m/44'/60'/0'/0", "m/44'/60'/0'/1",
+			"m/44'/60'/0'/2", "m/44'/60'/0'/3",
+			"m/44'/60'/0'/4", "m/44'/60'/0'/5",
+			"m/44'/60'/0'/6", "m/44'/60'/0'/7",
+			"m/44'/60'/0'/8", "m/44'/60'/0'/9",
+		})
+
+	testDerive(t, LedgerLiveIterator(DefaultBaseDerivationPath),
+		[]string{
+			"m/44'/60'/0'/0/0", "m/44'/60'/1'/0/0",
+			"m/44'/60'/2'/0/0", "m/44'/60'/3'/0/0",
+			"m/44'/60'/4'/0/0", "m/44'/60'/5'/0/0",
+			"m/44'/60'/6'/0/0", "m/44'/60'/7'/0/0",
+			"m/44'/60'/8'/0/0", "m/44'/60'/9'/0/0",
+		})
+}
--- a/accounts/keystore/account_cache.go
+++ b/accounts/keystore/account_cache.go
@@ -262,7 +262,7 @@ func (ac *accountCache) scanAccounts() error {
 		switch {
 		case err != nil:
 			log.Debug("Failed to decode keystore key", "path", path, "err", err)
-		case (addr == common.Address{}):
+		case addr == common.Address{}:
 			log.Debug("Failed to decode keystore key", "path", path, "err", "missing or zero address")
 		default:
 			return &accounts.Account{
--- a/accounts/keystore/file_cache.go
+++ b/accounts/keystore/file_cache.go
@@ -32,7 +32,7 @@ import (
 type fileCache struct {
 	all     mapset.Set // Set of all files from the keystore folder
 	lastMod time.Time  // Last time instance when a file was modified
-	mu      sync.RWMutex
+	mu      sync.Mutex
 }

 // scan performs a new scan on the given directory, compares against the already
--- a/accounts/keystore/key.go
+++ b/accounts/keystore/key.go
@@ -32,7 +32,7 @@ import (
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/pborman/uuid"
+	"github.com/google/uuid"
 )

 const (
@@ -110,7 +110,10 @@ func (k *Key) UnmarshalJSON(j []byte) (err error) {
 	}

 	u := new(uuid.UUID)
-	*u = uuid.Parse(keyJSON.Id)
+	*u, err = uuid.Parse(keyJSON.Id)
+	if err != nil {
+		return err
+	}
 	k.Id = *u
 	addr, err := hex.DecodeString(keyJSON.Address)
 	if err != nil {
@@ -128,7 +131,10 @@ func (k *Key) UnmarshalJSON(j []byte) (err error) {
 }

 func newKeyFromECDSA(privateKeyECDSA *ecdsa.PrivateKey) *Key {
-	id := uuid.NewRandom()
+	id, err := uuid.NewRandom()
+	if err != nil {
+		panic(fmt.Sprintf("Could not create random uuid: %v", err))
+	}
 	key := &Key{
 		Id:         id,
 		Address:    crypto.PubkeyToAddress(privateKeyECDSA.PublicKey),
--- a/accounts/keystore/keystore.go
+++ b/accounts/keystore/keystore.go
@@ -283,11 +283,9 @@ func (ks *KeyStore) SignTx(a accounts.Account, tx *types.Transaction, chainID *b
 	if !found {
 		return nil, ErrLocked
 	}
-	// Depending on the presence of the chain ID, sign with EIP155 or homestead
-	if chainID != nil {
-		return types.SignTx(tx, types.NewEIP155Signer(chainID), unlockedKey.PrivateKey)
-	}
-	return types.SignTx(tx, types.HomesteadSigner{}, unlockedKey.PrivateKey)
+	// Depending on the presence of the chain ID, sign with 2718 or homestead
+	signer := types.LatestSignerForChainID(chainID)
+	return types.SignTx(tx, signer, unlockedKey.PrivateKey)
 }

 // SignHashWithPassphrase signs hash if the private key matching the given address
@@ -310,12 +308,9 @@ func (ks *KeyStore) SignTxWithPassphrase(a accounts.Account, passphrase string,
 		return nil, err
 	}
 	defer zeroKey(key.PrivateKey)
-
-	// Depending on the presence of the chain ID, sign with EIP155 or homestead
-	if chainID != nil {
-		return types.SignTx(tx, types.NewEIP155Signer(chainID), key.PrivateKey)
-	}
-	return types.SignTx(tx, types.HomesteadSigner{}, key.PrivateKey)
+	// Depending on the presence of the chain ID, sign with or without replay protection.
+	signer := types.LatestSignerForChainID(chainID)
+	return types.SignTx(tx, signer, key.PrivateKey)
 }

 // Unlock unlocks the given account indefinitely.
--- a/accounts/keystore/keystore_test.go
+++ b/accounts/keystore/keystore_test.go
@@ -336,7 +336,9 @@ func TestWalletNotifications(t *testing.T) {

 	// Shut down the event collector and check events.
 	sub.Unsubscribe()
-	<-updates
+	for ev := range updates {
+		events = append(events, walletEvent{ev, ev.Wallet.Accounts()[0]})
+	}
 	checkAccounts(t, live, ks.Wallets())
 	checkEvents(t, wantEvents, events)
 }
--- a/accounts/keystore/passphrase.go
+++ b/accounts/keystore/passphrase.go
@@ -42,7 +42,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/math"
 	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/pborman/uuid"
+	"github.com/google/uuid"
 	"golang.org/x/crypto/pbkdf2"
 	"golang.org/x/crypto/scrypt"
 )
@@ -228,9 +228,12 @@ func DecryptKey(keyjson []byte, auth string) (*Key, error) {
 		return nil, err
 	}
 	key := crypto.ToECDSAUnsafe(keyBytes)
-
+	id, err := uuid.FromBytes(keyId)
+	if err != nil {
+		return nil, err
+	}
 	return &Key{
-		Id:         uuid.UUID(keyId),
+		Id:         id,
 		Address:    crypto.PubkeyToAddress(key.PublicKey),
 		PrivateKey: key,
 	}, nil
@@ -276,7 +279,11 @@ func decryptKeyV3(keyProtected *encryptedKeyJSONV3, auth string) (keyBytes []byt
 	if keyProtected.Version != version {
 		return nil, nil, fmt.Errorf("version not supported: %v", keyProtected.Version)
 	}
-	keyId = uuid.Parse(keyProtected.Id)
+	keyUUID, err := uuid.Parse(keyProtected.Id)
+	if err != nil {
+		return nil, nil, err
+	}
+	keyId = keyUUID[:]
 	plainText, err := DecryptDataV3(keyProtected.Crypto, auth)
 	if err != nil {
 		return nil, nil, err
@@ -285,7 +292,11 @@ func decryptKeyV3(keyProtected *encryptedKeyJSONV3, auth string) (keyBytes []byt
 }

 func decryptKeyV1(keyProtected *encryptedKeyJSONV1, auth string) (keyBytes []byte, keyId []byte, err error) {
-	keyId = uuid.Parse(keyProtected.Id)
+	keyUUID, err := uuid.Parse(keyProtected.Id)
+	if err != nil {
+		return nil, nil, err
+	}
+	keyId = keyUUID[:]
 	mac, err := hex.DecodeString(keyProtected.Crypto.MAC)
 	if err != nil {
 		return nil, nil, err
--- a/accounts/keystore/presale.go
+++ b/accounts/keystore/presale.go
@@ -27,7 +27,7 @@ import (

 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/pborman/uuid"
+	"github.com/google/uuid"
 	"golang.org/x/crypto/pbkdf2"
 )

@@ -37,7 +37,10 @@ func importPreSaleKey(keyStore keyStore, keyJSON []byte, password string) (accou
 	if err != nil {
 		return accounts.Account{}, nil, err
 	}
-	key.Id = uuid.NewRandom()
+	key.Id, err = uuid.NewRandom()
+	if err != nil {
+		return accounts.Account{}, nil, err
+	}
 	a := accounts.Account{
 		Address: key.Address,
 		URL: accounts.URL{
@@ -86,7 +89,7 @@ func decryptPreSaleKey(fileContent []byte, password string) (key *Key, err error
 	ecKey := crypto.ToECDSAUnsafe(ethPriv)

 	key = &Key{
-		Id:         nil,
+		Id:         uuid.UUID{},
 		Address:    crypto.PubkeyToAddress(ecKey.PublicKey),
 		PrivateKey: ecKey,
 	}
--- a/accounts/keystore/wallet.go
+++ b/accounts/keystore/wallet.go
@@ -19,7 +19,7 @@ package keystore
 import (
 	"math/big"

-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -58,7 +58,7 @@ func (w *keystoreWallet) Open(passphrase string) error { return nil }
 func (w *keystoreWallet) Close() error { return nil }

 // Accounts implements accounts.Wallet, returning an account list consisting of
-// a single account that the plain kestore wallet contains.
+// a single account that the plain keystore wallet contains.
 func (w *keystoreWallet) Accounts() []accounts.Account {
 	return []accounts.Account{w.account}
 }
@@ -93,12 +93,12 @@ func (w *keystoreWallet) signHash(account accounts.Account, hash []byte) ([]byte
 	return w.keystore.SignHash(account, hash)
 }

-// SignData signs keccak256(data). The mimetype parameter describes the type of data being signed
+// SignData signs keccak256(data). The mimetype parameter describes the type of data being signed.
 func (w *keystoreWallet) SignData(account accounts.Account, mimeType string, data []byte) ([]byte, error) {
 	return w.signHash(account, crypto.Keccak256(data))
 }

-// SignDataWithPassphrase signs keccak256(data). The mimetype parameter describes the type of data being signed
+// SignDataWithPassphrase signs keccak256(data). The mimetype parameter describes the type of data being signed.
 func (w *keystoreWallet) SignDataWithPassphrase(account accounts.Account, passphrase, mimeType string, data []byte) ([]byte, error) {
 	// Make sure the requested account is contained within
 	if !w.Contains(account) {
@@ -108,12 +108,14 @@ func (w *keystoreWallet) SignDataWithPassphrase(account accounts.Account, passph
 	return w.keystore.SignHashWithPassphrase(account, passphrase, crypto.Keccak256(data))
 }

+// SignText implements accounts.Wallet, attempting to sign the hash of
+// the given text with the given account.
 func (w *keystoreWallet) SignText(account accounts.Account, text []byte) ([]byte, error) {
 	return w.signHash(account, accounts.TextHash(text))
 }

 // SignTextWithPassphrase implements accounts.Wallet, attempting to sign the
-// given hash with the given account using passphrase as extra authentication.
+// hash of the given text with the given account using passphrase as extra authentication.
 func (w *keystoreWallet) SignTextWithPassphrase(account accounts.Account, passphrase string, text []byte) ([]byte, error) {
 	// Make sure the requested account is contained within
 	if !w.Contains(account) {
--- a/accounts/scwallet/README.md
+++ b/accounts/scwallet/README.md
@@ -31,12 +31,16 @@
  Write down the URL (`keycard://044def09` in this example). Then ask `geth` to open the wallet:

  ```
-  > personal.openWallet("keycard://044def09")
-  Please enter the pairing password:
+  > personal.openWallet("keycard://044def09", "pairing password")
  ```

-  Enter the pairing password that you have received during card initialization. Same with the PIN that you will subsequently be
-  asked for.
+  The pairing password has been generated during the card initialization process.
+  
+  The process needs to be repeated once more with the PIN:
+
+  ```
+  > personal.openWallet("keycard://044def09", "PIN number")
+  ```
  
  If everything goes well, you should see your new account when typing `personal` on the console:

--- a/accounts/scwallet/securechannel.go
+++ b/accounts/scwallet/securechannel.go
@@ -20,6 +20,7 @@ import (
 	"bytes"
 	"crypto/aes"
 	"crypto/cipher"
+	"crypto/elliptic"
 	"crypto/rand"
 	"crypto/sha256"
 	"crypto/sha512"
@@ -27,7 +28,6 @@ import (

 	"github.com/ethereum/go-ethereum/crypto"
 	pcsc "github.com/gballet/go-libpcsclite"
-	"github.com/wsddn/go-ecdh"
 	"golang.org/x/crypto/pbkdf2"
 	"golang.org/x/text/unicode/norm"
 )
@@ -63,26 +63,19 @@ type SecureChannelSession struct {
 // NewSecureChannelSession creates a new secure channel for the given card and public key.
 func NewSecureChannelSession(card *pcsc.Card, keyData []byte) (*SecureChannelSession, error) {
 	// Generate an ECDSA keypair for ourselves
-	gen := ecdh.NewEllipticECDH(crypto.S256())
-	private, public, err := gen.GenerateKey(rand.Reader)
+	key, err := crypto.GenerateKey()
 	if err != nil {
 		return nil, err
 	}
-
-	cardPublic, ok := gen.Unmarshal(keyData)
-	if !ok {
-		return nil, fmt.Errorf("could not unmarshal public key from card")
-	}
-
-	secret, err := gen.GenerateSharedSecret(private, cardPublic)
+	cardPublic, err := crypto.UnmarshalPubkey(keyData)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("could not unmarshal public key from card: %v", err)
 	}
-
+	secret, _ := key.Curve.ScalarMult(cardPublic.X, cardPublic.Y, key.D.Bytes())
 	return &SecureChannelSession{
 		card:      card,
-		secret:    secret,
-		publicKey: gen.Marshal(public),
+		secret:    secret.Bytes(),
+		publicKey: elliptic.Marshal(crypto.S256(), key.PublicKey.X, key.PublicKey.Y),
 	}, nil
 }

--- a/accounts/scwallet/wallet.go
+++ b/accounts/scwallet/wallet.go
@@ -33,7 +33,7 @@ import (
 	"sync"
 	"time"

-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -637,7 +637,7 @@ func (w *Wallet) Derive(path accounts.DerivationPath, pin bool) (accounts.Accoun
 // to discover non zero accounts and automatically add them to list of tracked
 // accounts.
 //
-// Note, self derivaton will increment the last component of the specified path
+// Note, self derivation will increment the last component of the specified path
 // opposed to decending into a child path to allow discovering accounts starting
 // from non zero components.
 //
@@ -699,7 +699,7 @@ func (w *Wallet) signHash(account accounts.Account, hash []byte) ([]byte, error)
 // the needed details via SignTxWithPassphrase, or by other means (e.g. unlock
 // the account in a keystore).
 func (w *Wallet) SignTx(account accounts.Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) {
-	signer := types.NewEIP155Signer(chainID)
+	signer := types.LatestSignerForChainID(chainID)
 	hash := signer.Hash(tx)
 	sig, err := w.signHash(account, hash[:])
 	if err != nil {
--- a/accounts/usbwallet/ledger.go
+++ b/accounts/usbwallet/ledger.go
@@ -162,7 +162,7 @@ func (w *ledgerDriver) SignTx(path accounts.DerivationPath, tx *types.Transactio
 		return common.Address{}, nil, accounts.ErrWalletClosed
 	}
 	// Ensure the wallet is capable of signing the given transaction
-	if chainID != nil && w.version[0] <= 1 && w.version[2] <= 2 {
+	if chainID != nil && w.version[0] <= 1 && w.version[1] <= 0 && w.version[2] <= 2 {
 		//lint:ignore ST1005 brand name displayed on the console
 		return common.Address{}, nil, fmt.Errorf("Ledger v%d.%d.%d doesn't support signing this transaction, please update to v1.0.3 at least", w.version[0], w.version[1], w.version[2])
 	}
--- a/accounts/usbwallet/trezor.go
+++ b/accounts/usbwallet/trezor.go
@@ -255,9 +255,11 @@ func (w *trezorDriver) trezorSign(derivationPath []uint32, tx *types.Transaction
 	if chainID == nil {
 		signer = new(types.HomesteadSigner)
 	} else {
+		// Trezor backend does not support typed transactions yet.
 		signer = types.NewEIP155Signer(chainID)
 		signature[64] -= byte(chainID.Uint64()*2 + 35)
 	}
+
 	// Inject the final signature into the transaction and sanity check the sender
 	signed, err := tx.WithSignature(signer, signature)
 	if err != nil {
--- a/accounts/usbwallet/wallet.go
+++ b/accounts/usbwallet/wallet.go
@@ -25,7 +25,7 @@ import (
 	"sync"
 	"time"

-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -493,7 +493,7 @@ func (w *wallet) Derive(path accounts.DerivationPath, pin bool) (accounts.Accoun
 // to discover non zero accounts and automatically add them to list of tracked
 // accounts.
 //
-// Note, self derivaton will increment the last component of the specified path
+// Note, self derivation will increment the last component of the specified path
 // opposed to decending into a child path to allow discovering accounts starting
 // from non zero components.
 //
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -24,13 +24,13 @@ environment:
 install:
  - git submodule update --init
  - rmdir C:\go /s /q
-  - appveyor DownloadFile https://dl.google.com/go/go1.15.windows-%GETH_ARCH%.zip
-  - 7z x go1.15.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
+  - appveyor DownloadFile https://dl.google.com/go/go1.16.windows-%GETH_ARCH%.zip
+  - 7z x go1.16.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
  - go version
  - gcc --version

 build_script:
-  - go run build\ci.go install
+  - go run build\ci.go install -dlgo

 after_build:
  - go run build\ci.go archive -type zip -signer WINDOWS_SIGNING_KEY -upload gethstore/builds
--- a/build/checksums.txt
+++ b/build/checksums.txt
@@ -1,6 +1,17 @@
 # This file contains sha256 checksums of optional build dependencies.

-69438f7ed4f532154ffaf878f3dfd83747e7a00b70b3556eddabf7aaee28ac3a  go1.15.src.tar.gz
+7688063d55656105898f323d90a79a39c378d86fe89ae192eb3b7fc46347c95a  go1.16.src.tar.gz
+6000a9522975d116bf76044967d7e69e04e982e9625330d9a539a8b45395f9a8  go1.16.darwin-amd64.tar.gz
+ea435a1ac6d497b03e367fdfb74b33e961d813883468080f6e239b3b03bea6aa  go1.16.linux-386.tar.gz
+013a489ebb3e24ef3d915abe5b94c3286c070dfe0818d5bca8108f1d6e8440d2  go1.16.linux-amd64.tar.gz
+3770f7eb22d05e25fbee8fb53c2a4e897da043eb83c69b9a14f8d98562cd8098  go1.16.linux-arm64.tar.gz
+d1d9404b1dbd77afa2bdc70934e10fbfcf7d785c372efc29462bb7d83d0a32fd  go1.16.linux-armv6l.tar.gz
+481492a17d42193d471b93b7a06da3555331bd833b76336afc87be820c48933f  go1.16.windows-386.zip
+5cc88fa506b3d5c453c54c3ea218fc8dd05d7362ae1de15bb67986b72089ce93  go1.16.windows-amd64.zip
+d7d6c70b05a7c2f68b48aab5ab8cb5116b8444c9ddad131673b152e7cff7c726  go1.16.freebsd-386.tar.gz
+40b03216f6945fb6883a50604fc7f409a83f62171607229a9c598e701e684f8a  go1.16.freebsd-amd64.tar.gz
+27a1aaa988e930b7932ce459c8a63ad5b3333b3a06b016d87ff289f2a11aacd6  go1.16.linux-ppc64le.tar.gz
+be4c9e4e2cf058efc4e3eb013a760cb989ddc4362f111950c990d1c63b27ccbe  go1.16.linux-s390x.tar.gz

 d998a84eea42f2271aca792a7b027ca5c1edfcba229e8e5a844c9ac3f336df35  golangci-lint-1.27.0-linux-armv7.tar.gz
 bf781f05b0d393b4bf0a327d9e62926949a4f14d7774d950c4e009fc766ed1d4  golangci-lint.exe-1.27.0-windows-amd64.zip
--- a/build/ci.go
+++ b/build/ci.go
@@ -26,7 +26,7 @@ Available commands are:
   install    [ -arch architecture ] [ -cc compiler ] [ packages... ]                          -- builds packages and executables
   test       [ -coverage ] [ packages... ]                                                    -- runs the tests
   lint                                                                                        -- runs certain pre-selected linters
-   archive    [ -arch architecture ] [ -type zip|tar ] [ -signer key-envvar ] [ -upload dest ] -- archives build artifacts
+   archive    [ -arch architecture ] [ -type zip|tar ] [ -signer key-envvar ] [ -signify key-envvar ] [ -upload dest ] -- archives build artifacts
   importkeys                                                                                  -- imports signing keys from env
   debsrc     [ -signer key-id ] [ -upload dest ]                                              -- creates a debian source package
   nsis                                                                                        -- creates a Windows NSIS installer
@@ -46,12 +46,11 @@ import (
 	"encoding/base64"
 	"flag"
 	"fmt"
-	"go/parser"
-	"go/token"
 	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
+	"path"
 	"path/filepath"
 	"regexp"
 	"runtime"
@@ -59,6 +58,7 @@ import (
 	"time"

 	"github.com/cespare/cp"
+	"github.com/ethereum/go-ethereum/crypto/signify"
 	"github.com/ethereum/go-ethereum/internal/build"
 	"github.com/ethereum/go-ethereum/params"
 )
@@ -135,11 +135,11 @@ var (
 	// 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.
 	debDistroGoBoots = map[string]string{
 		"trusty": "golang-1.11",
 		"xenial": "golang-go",
 		"bionic": "golang-go",
-		"eoan":   "golang-go",
 		"focal":  "golang-go",
 		"groovy": "golang-go",
 	}
@@ -148,6 +148,11 @@ var (
 		"golang-1.11": "/usr/lib/go-1.11",
 		"golang-go":   "/usr/lib/go",
 	}
+
+	// This is the version of go that will be downloaded by
+	//
+	//     go run ci.go install -dlgo
+	dlgoVersion = "1.16"
 )

 var GOBIN, _ = filepath.Abs(filepath.Join("build", "bin"))
@@ -198,19 +203,19 @@ func main() {

 func doInstall(cmdline []string) {
 	var (
+		dlgo = flag.Bool("dlgo", false, "Download Go and build with it")
 		arch = flag.String("arch", "", "Architecture to cross build for")
 		cc   = flag.String("cc", "", "C compiler to cross build with")
 	)
 	flag.CommandLine.Parse(cmdline)
 	env := build.Env()

-	// Check Go version. People regularly open issues about compilation
+	// Check local Go version. People regularly open issues about compilation
 	// failure with outdated Go. This should save them the trouble.
 	if !strings.Contains(runtime.Version(), "devel") {
 		// Figure out the minor version number since we can't textually compare (1.10 < 1.9)
 		var minor int
 		fmt.Sscanf(strings.TrimPrefix(runtime.Version(), "go1."), "%d", &minor)
-
 		if minor < 13 {
 			log.Println("You have Go version", runtime.Version())
 			log.Println("go-ethereum requires at least Go version 1.13 and cannot")
@@ -218,90 +223,110 @@ func doInstall(cmdline []string) {
 			os.Exit(1)
 		}
 	}
-	// Compile packages given as arguments, or everything if there are no arguments.
-	packages := []string{"./..."}
-	if flag.NArg() > 0 {
-		packages = flag.Args()
+
+	// Choose which go command we're going to use.
+	var gobuild *exec.Cmd
+	if !*dlgo {
+		// Default behavior: use the go version which runs ci.go right now.
+		gobuild = goTool("build")
+	} else {
+		// Download of Go requested. This is for build environments where the
+		// installed version is too old and cannot be upgraded easily.
+		cachedir := filepath.Join("build", "cache")
+		goroot := downloadGo(runtime.GOARCH, runtime.GOOS, cachedir)
+		gobuild = localGoTool(goroot, "build")
 	}

-	if *arch == "" || *arch == runtime.GOARCH {
-		goinstall := goTool("install", buildFlags(env)...)
-		if runtime.GOARCH == "arm64" {
-			goinstall.Args = append(goinstall.Args, "-p", "1")
-		}
-		goinstall.Args = append(goinstall.Args, "-trimpath")
-		goinstall.Args = append(goinstall.Args, "-v")
-		goinstall.Args = append(goinstall.Args, packages...)
-		build.MustRun(goinstall)
-		return
+	// Configure environment for cross build.
+	if *arch != "" || *arch != runtime.GOARCH {
+		gobuild.Env = append(gobuild.Env, "CGO_ENABLED=1")
+		gobuild.Env = append(gobuild.Env, "GOARCH="+*arch)
 	}

-	// Seems we are cross compiling, work around forbidden GOBIN
-	goinstall := goToolArch(*arch, *cc, "install", buildFlags(env)...)
-	goinstall.Args = append(goinstall.Args, "-trimpath")
-	goinstall.Args = append(goinstall.Args, "-v")
-	goinstall.Args = append(goinstall.Args, []string{"-buildmode", "archive"}...)
-	goinstall.Args = append(goinstall.Args, packages...)
-	build.MustRun(goinstall)
+	// Configure C compiler.
+	if *cc != "" {
+		gobuild.Env = append(gobuild.Env, "CC="+*cc)
+	} else if os.Getenv("CC") != "" {
+		gobuild.Env = append(gobuild.Env, "CC="+os.Getenv("CC"))
+	}

-	if cmds, err := ioutil.ReadDir("cmd"); err == nil {
-		for _, cmd := range cmds {
-			pkgs, err := parser.ParseDir(token.NewFileSet(), filepath.Join(".", "cmd", cmd.Name()), nil, parser.PackageClauseOnly)
-			if err != nil {
-				log.Fatal(err)
-			}
-			for name := range pkgs {
-				if name == "main" {
-					gobuild := goToolArch(*arch, *cc, "build", buildFlags(env)...)
-					gobuild.Args = append(gobuild.Args, "-v")
-					gobuild.Args = append(gobuild.Args, []string{"-o", executablePath(cmd.Name())}...)
-					gobuild.Args = append(gobuild.Args, "."+string(filepath.Separator)+filepath.Join("cmd", cmd.Name()))
-					build.MustRun(gobuild)
-					break
-				}
-			}
-		}
+	// arm64 CI builders are memory-constrained and can't handle concurrent builds,
+	// better disable it. This check isn't the best, it should probably
+	// check for something in env instead.
+	if runtime.GOARCH == "arm64" {
+		gobuild.Args = append(gobuild.Args, "-p", "1")
+	}
+
+	// Put the default settings in.
+	gobuild.Args = append(gobuild.Args, buildFlags(env)...)
+
+	// We use -trimpath to avoid leaking local paths into the built executables.
+	gobuild.Args = append(gobuild.Args, "-trimpath")
+
+	// Show packages during build.
+	gobuild.Args = append(gobuild.Args, "-v")
+
+	// Now we choose what we're even building.
+	// Default: collect all 'main' packages in cmd/ and build those.
+	packages := flag.Args()
+	if len(packages) == 0 {
+		packages = build.FindMainPackages("./cmd")
+	}
+
+	// Do the build!
+	for _, pkg := range packages {
+		args := make([]string, len(gobuild.Args))
+		copy(args, gobuild.Args)
+		args = append(args, "-o", executablePath(path.Base(pkg)))
+		args = append(args, pkg)
+		build.MustRun(&exec.Cmd{Path: gobuild.Path, Args: args, Env: gobuild.Env})
 	}
 }

+// buildFlags returns the go tool flags for building.
 func buildFlags(env build.Environment) (flags []string) {
 	var ld []string
 	if env.Commit != "" {
 		ld = append(ld, "-X", "main.gitCommit="+env.Commit)
 		ld = append(ld, "-X", "main.gitDate="+env.Date)
 	}
+	// Strip DWARF on darwin. This used to be required for certain things,
+	// and there is no downside to this, so we just keep doing it.
 	if runtime.GOOS == "darwin" {
 		ld = append(ld, "-s")
 	}
-
 	if len(ld) > 0 {
 		flags = append(flags, "-ldflags", strings.Join(ld, " "))
 	}
 	return flags
 }

+// goTool returns the go tool. This uses the Go version which runs ci.go.
 func goTool(subcmd string, args ...string) *exec.Cmd {
-	return goToolArch(runtime.GOARCH, os.Getenv("CC"), subcmd, args...)
+	cmd := build.GoTool(subcmd, args...)
+	goToolSetEnv(cmd)
+	return cmd
 }

-func goToolArch(arch string, cc string, subcmd string, args ...string) *exec.Cmd {
-	cmd := build.GoTool(subcmd, args...)
-	if arch == "" || arch == runtime.GOARCH {
-		cmd.Env = append(cmd.Env, "GOBIN="+GOBIN)
-	} else {
-		cmd.Env = append(cmd.Env, "CGO_ENABLED=1")
-		cmd.Env = append(cmd.Env, "GOARCH="+arch)
-	}
-	if cc != "" {
-		cmd.Env = append(cmd.Env, "CC="+cc)
-	}
+// localGoTool returns the go tool from the given GOROOT.
+func localGoTool(goroot string, subcmd string, args ...string) *exec.Cmd {
+	gotool := filepath.Join(goroot, "bin", "go")
+	cmd := exec.Command(gotool, subcmd)
+	goToolSetEnv(cmd)
+	cmd.Env = append(cmd.Env, "GOROOT="+goroot)
+	cmd.Args = append(cmd.Args, args...)
+	return cmd
+}
+
+// goToolSetEnv forwards the build environment to the go tool.
+func goToolSetEnv(cmd *exec.Cmd) {
+	cmd.Env = append(cmd.Env, "GOBIN="+GOBIN)
 	for _, e := range os.Environ() {
-		if strings.HasPrefix(e, "GOBIN=") {
+		if strings.HasPrefix(e, "GOBIN=") || strings.HasPrefix(e, "CC=") {
 			continue
 		}
 		cmd.Env = append(cmd.Env, e)
 	}
-	return cmd
 }

 // Running The Tests
@@ -363,7 +388,7 @@ func downloadLinter(cachedir string) string {
 	if err := csdb.DownloadFile(url, archivePath); err != nil {
 		log.Fatal(err)
 	}
-	if err := build.ExtractTarballArchive(archivePath, cachedir); err != nil {
+	if err := build.ExtractArchive(archivePath, cachedir); err != nil {
 		log.Fatal(err)
 	}
 	return filepath.Join(cachedir, base, "golangci-lint")
@@ -372,11 +397,12 @@ func downloadLinter(cachedir string) string {
 // Release Packaging
 func doArchive(cmdline []string) {
 	var (
-		arch   = flag.String("arch", runtime.GOARCH, "Architecture cross packaging")
-		atype  = flag.String("type", "zip", "Type of archive to write (zip|tar)")
-		signer = flag.String("signer", "", `Environment variable holding the signing key (e.g. LINUX_SIGNING_KEY)`)
-		upload = flag.String("upload", "", `Destination to upload the archives (usually "gethstore/builds")`)
-		ext    string
+		arch    = flag.String("arch", runtime.GOARCH, "Architecture cross packaging")
+		atype   = flag.String("type", "zip", "Type of archive to write (zip|tar)")
+		signer  = flag.String("signer", "", `Environment variable holding the signing key (e.g. LINUX_SIGNING_KEY)`)
+		signify = flag.String("signify", "", `Environment variable holding the signify key (e.g. LINUX_SIGNIFY_KEY)`)
+		upload  = flag.String("upload", "", `Destination to upload the archives (usually "gethstore/builds")`)
+		ext     string
 	)
 	flag.CommandLine.Parse(cmdline)
 	switch *atype {
@@ -403,7 +429,7 @@ func doArchive(cmdline []string) {
 		log.Fatal(err)
 	}
 	for _, archive := range []string{geth, alltools} {
-		if err := archiveUpload(archive, *upload, *signer); err != nil {
+		if err := archiveUpload(archive, *upload, *signer, *signify); err != nil {
 			log.Fatal(err)
 		}
 	}
@@ -423,7 +449,7 @@ func archiveBasename(arch string, archiveVersion string) string {
 	return platform + "-" + archiveVersion
 }

-func archiveUpload(archive string, blobstore string, signer string) error {
+func archiveUpload(archive string, blobstore string, signer string, signifyVar string) error {
 	// If signing was requested, generate the signature files
 	if signer != "" {
 		key := getenvBase64(signer)
@@ -431,6 +457,14 @@ func archiveUpload(archive string, blobstore string, signer string) error {
 			return err
 		}
 	}
+	if signifyVar != "" {
+		key := os.Getenv(signifyVar)
+		untrustedComment := "verify with geth-release.pub"
+		trustedComment := fmt.Sprintf("%s (%s)", archive, time.Now().UTC().Format(time.RFC1123))
+		if err := signify.SignFile(archive, archive+".sig", key, untrustedComment, trustedComment); err != nil {
+			return err
+		}
+	}
 	// If uploading to Azure was requested, push the archive possibly with its signature
 	if blobstore != "" {
 		auth := build.AzureBlobstoreConfig{
@@ -446,6 +480,11 @@ func archiveUpload(archive string, blobstore string, signer string) error {
 				return err
 			}
 		}
+		if signifyVar != "" {
+			if err := build.AzureBlobstoreUpload(archive+".sig", filepath.Base(archive+".sig"), auth); err != nil {
+				return err
+			}
+		}
 	}
 	return nil
 }
@@ -469,13 +508,12 @@ func maybeSkipArchive(env build.Environment) {
 // Debian Packaging
 func doDebianSource(cmdline []string) {
 	var (
-		goversion = flag.String("goversion", "", `Go version to build with (will be included in the source package)`)
-		cachedir  = flag.String("cachedir", "./build/cache", `Filesystem path to cache the downloaded Go bundles at`)
-		signer    = flag.String("signer", "", `Signing key name, also used as package author`)
-		upload    = flag.String("upload", "", `Where to upload the source package (usually "ethereum/ethereum")`)
-		sshUser   = flag.String("sftp-user", "", `Username for SFTP upload (usually "geth-ci")`)
-		workdir   = flag.String("workdir", "", `Output directory for packages (uses temp dir if unset)`)
-		now       = time.Now()
+		cachedir = flag.String("cachedir", "./build/cache", `Filesystem path to cache the downloaded Go bundles at`)
+		signer   = flag.String("signer", "", `Signing key name, also used as package author`)
+		upload   = flag.String("upload", "", `Where to upload the source package (usually "ethereum/ethereum")`)
+		sshUser  = flag.String("sftp-user", "", `Username for SFTP upload (usually "geth-ci")`)
+		workdir  = flag.String("workdir", "", `Output directory for packages (uses temp dir if unset)`)
+		now      = time.Now()
 	)
 	flag.CommandLine.Parse(cmdline)
 	*workdir = makeWorkdir(*workdir)
@@ -490,10 +528,10 @@ func doDebianSource(cmdline []string) {
 	}

 	// Download and verify the Go source package.
-	gobundle := downloadGoSources(*goversion, *cachedir)
+	gobundle := downloadGoSources(*cachedir)

 	// Download all the dependencies needed to build the sources and run the ci script
-	srcdepfetch := goTool("install", "-n", "./...")
+	srcdepfetch := goTool("mod", "download")
 	srcdepfetch.Env = append(os.Environ(), "GOPATH="+filepath.Join(*workdir, "modgopath"))
 	build.MustRun(srcdepfetch)

@@ -509,7 +547,7 @@ func doDebianSource(cmdline []string) {
 			pkgdir := stageDebianSource(*workdir, meta)

 			// Add Go source code
-			if err := build.ExtractTarballArchive(gobundle, pkgdir); err != nil {
+			if err := build.ExtractArchive(gobundle, pkgdir); err != nil {
 				log.Fatalf("Failed to extract Go sources: %v", err)
 			}
 			if err := os.Rename(filepath.Join(pkgdir, "go"), filepath.Join(pkgdir, ".go")); err != nil {
@@ -541,9 +579,10 @@ func doDebianSource(cmdline []string) {
 	}
 }

-func downloadGoSources(version string, cachedir string) string {
+// downloadGoSources downloads the Go source tarball.
+func downloadGoSources(cachedir string) string {
 	csdb := build.MustLoadChecksums("build/checksums.txt")
-	file := fmt.Sprintf("go%s.src.tar.gz", version)
+	file := fmt.Sprintf("go%s.src.tar.gz", dlgoVersion)
 	url := "https://dl.google.com/go/" + file
 	dst := filepath.Join(cachedir, file)
 	if err := csdb.DownloadFile(url, dst); err != nil {
@@ -552,6 +591,41 @@ func downloadGoSources(version string, cachedir string) string {
 	return dst
 }

+// downloadGo downloads the Go binary distribution and unpacks it into a temporary
+// directory. It returns the GOROOT of the unpacked toolchain.
+func downloadGo(goarch, goos, cachedir string) string {
+	if goarch == "arm" {
+		goarch = "armv6l"
+	}
+
+	csdb := build.MustLoadChecksums("build/checksums.txt")
+	file := fmt.Sprintf("go%s.%s-%s", dlgoVersion, goos, goarch)
+	if goos == "windows" {
+		file += ".zip"
+	} else {
+		file += ".tar.gz"
+	}
+	url := "https://golang.org/dl/" + file
+	dst := filepath.Join(cachedir, file)
+	if err := csdb.DownloadFile(url, dst); err != nil {
+		log.Fatal(err)
+	}
+
+	ucache, err := os.UserCacheDir()
+	if err != nil {
+		log.Fatal(err)
+	}
+	godir := filepath.Join(ucache, fmt.Sprintf("geth-go-%s-%s-%s", dlgoVersion, goos, goarch))
+	if err := build.ExtractArchive(dst, godir); err != nil {
+		log.Fatal(err)
+	}
+	goroot, err := filepath.Abs(filepath.Join(godir, "go"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	return goroot
+}
+
 func ppaUpload(workdir, ppa, sshUser string, files []string) {
 	p := strings.Split(ppa, "/")
 	if len(p) != 2 {
@@ -747,6 +821,7 @@ func doWindowsInstaller(cmdline []string) {
 	var (
 		arch    = flag.String("arch", runtime.GOARCH, "Architecture for cross build packaging")
 		signer  = flag.String("signer", "", `Environment variable holding the signing key (e.g. WINDOWS_SIGNING_KEY)`)
+		signify = flag.String("signify key", "", `Environment variable holding the signify signing key (e.g. WINDOWS_SIGNIFY_KEY)`)
 		upload  = flag.String("upload", "", `Destination to upload the archives (usually "gethstore/builds")`)
 		workdir = flag.String("workdir", "", `Output directory for packages (uses temp dir if unset)`)
 	)
@@ -808,7 +883,7 @@ func doWindowsInstaller(cmdline []string) {
 		filepath.Join(*workdir, "geth.nsi"),
 	)
 	// Sign and publish installer.
-	if err := archiveUpload(installer, *upload, *signer); err != nil {
+	if err := archiveUpload(installer, *upload, *signer, *signify); err != nil {
 		log.Fatal(err)
 	}
 }
@@ -817,10 +892,11 @@ func doWindowsInstaller(cmdline []string) {

 func doAndroidArchive(cmdline []string) {
 	var (
-		local  = flag.Bool("local", false, `Flag whether we're only doing a local build (skip Maven artifacts)`)
-		signer = flag.String("signer", "", `Environment variable holding the signing key (e.g. ANDROID_SIGNING_KEY)`)
-		deploy = flag.String("deploy", "", `Destination to deploy the archive (usually "https://oss.sonatype.org")`)
-		upload = flag.String("upload", "", `Destination to upload the archive (usually "gethstore/builds")`)
+		local   = flag.Bool("local", false, `Flag whether we're only doing a local build (skip Maven artifacts)`)
+		signer  = flag.String("signer", "", `Environment variable holding the signing key (e.g. ANDROID_SIGNING_KEY)`)
+		signify = flag.String("signify", "", `Environment variable holding the signify signing key (e.g. ANDROID_SIGNIFY_KEY)`)
+		deploy  = flag.String("deploy", "", `Destination to deploy the archive (usually "https://oss.sonatype.org")`)
+		upload  = flag.String("upload", "", `Destination to upload the archive (usually "gethstore/builds")`)
 	)
 	flag.CommandLine.Parse(cmdline)
 	env := build.Env()
@@ -836,6 +912,7 @@ func doAndroidArchive(cmdline []string) {
 	if *local {
 		// If we're building locally, copy bundle to build dir and skip Maven
 		os.Rename("geth.aar", filepath.Join(GOBIN, "geth.aar"))
+		os.Rename("geth-sources.jar", filepath.Join(GOBIN, "geth-sources.jar"))
 		return
 	}
 	meta := newMavenMetadata(env)
@@ -848,7 +925,7 @@ func doAndroidArchive(cmdline []string) {
 	archive := "geth-" + archiveBasename("android", params.ArchiveVersion(env.Commit)) + ".aar"
 	os.Rename("geth.aar", archive)

-	if err := archiveUpload(archive, *upload, *signer); err != nil {
+	if err := archiveUpload(archive, *upload, *signer, *signify); err != nil {
 		log.Fatal(err)
 	}
 	// Sign and upload all the artifacts to Maven Central
@@ -941,10 +1018,11 @@ func newMavenMetadata(env build.Environment) mavenMetadata {

 func doXCodeFramework(cmdline []string) {
 	var (
-		local  = flag.Bool("local", false, `Flag whether we're only doing a local build (skip Maven artifacts)`)
-		signer = flag.String("signer", "", `Environment variable holding the signing key (e.g. IOS_SIGNING_KEY)`)
-		deploy = flag.String("deploy", "", `Destination to deploy the archive (usually "trunk")`)
-		upload = flag.String("upload", "", `Destination to upload the archives (usually "gethstore/builds")`)
+		local   = flag.Bool("local", false, `Flag whether we're only doing a local build (skip Maven artifacts)`)
+		signer  = flag.String("signer", "", `Environment variable holding the signing key (e.g. IOS_SIGNING_KEY)`)
+		signify = flag.String("signify", "", `Environment variable holding the signify signing key (e.g. IOS_SIGNIFY_KEY)`)
+		deploy  = flag.String("deploy", "", `Destination to deploy the archive (usually "trunk")`)
+		upload  = flag.String("upload", "", `Destination to upload the archives (usually "gethstore/builds")`)
 	)
 	flag.CommandLine.Parse(cmdline)
 	env := build.Env()
@@ -972,14 +1050,14 @@ func doXCodeFramework(cmdline []string) {
 	maybeSkipArchive(env)

 	// Sign and upload the framework to Azure
-	if err := archiveUpload(archive+".tar.gz", *upload, *signer); err != nil {
+	if err := archiveUpload(archive+".tar.gz", *upload, *signer, *signify); err != nil {
 		log.Fatal(err)
 	}
 	// Prepare and upload a PodSpec to CocoaPods
 	if *deploy != "" {
 		meta := newPodMetadata(env, archive)
 		build.Render("build/pod.podspec", "Geth.podspec", 0755, meta)
-		build.MustRunCommand("pod", *deploy, "push", "Geth.podspec", "--allow-warnings", "--verbose")
+		build.MustRunCommand("pod", *deploy, "push", "Geth.podspec", "--allow-warnings")
 	}
 }

--- a/cmd/abigen/main.go
+++ b/cmd/abigen/main.go
@@ -96,7 +96,7 @@ var (
 	}
 	aliasFlag = cli.StringFlag{
 		Name:  "alias",
-		Usage: "Comma separated aliases for function and event renaming, e.g. foo=bar",
+		Usage: "Comma separated aliases for function and event renaming, e.g. original1=alias1, original2=alias2",
 	}
 )

--- a/cmd/bootnode/main.go
+++ b/cmd/bootnode/main.go
@@ -28,7 +28,6 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/p2p/discover"
-	"github.com/ethereum/go-ethereum/p2p/discv5"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/p2p/nat"
 	"github.com/ethereum/go-ethereum/p2p/netutil"
@@ -44,7 +43,7 @@ func main() {
 		natdesc     = flag.String("nat", "none", "port mapping mechanism (any|none|upnp|pmp|extip:<IP>)")
 		netrestrict = flag.String("netrestrict", "", "restrict network communication to the given IP networks (CIDR masks)")
 		runv5       = flag.Bool("v5", false, "run a v5 topic discovery bootnode")
-		verbosity   = flag.Int("verbosity", int(log.LvlInfo), "log verbosity (0-9)")
+		verbosity   = flag.Int("verbosity", int(log.LvlInfo), "log verbosity (0-5)")
 		vmodule     = flag.String("vmodule", "", "log verbosity pattern")

 		nodeKey *ecdsa.PrivateKey
@@ -121,17 +120,17 @@ func main() {

 	printNotice(&nodeKey.PublicKey, *realaddr)

+	db, _ := enode.OpenDB("")
+	ln := enode.NewLocalNode(db, nodeKey)
+	cfg := discover.Config{
+		PrivateKey:  nodeKey,
+		NetRestrict: restrictList,
+	}
 	if *runv5 {
-		if _, err := discv5.ListenUDP(nodeKey, conn, "", restrictList); err != nil {
+		if _, err := discover.ListenV5(conn, ln, cfg); err != nil {
 			utils.Fatalf("%v", err)
 		}
 	} else {
-		db, _ := enode.OpenDB("")
-		ln := enode.NewLocalNode(db, nodeKey)
-		cfg := discover.Config{
-			PrivateKey:  nodeKey,
-			NetRestrict: restrictList,
-		}
 		if _, err := discover.ListenUDP(conn, ln, cfg); err != nil {
 			utils.Fatalf("%v", err)
 		}
--- a/cmd/clef/extapi_changelog.md
+++ b/cmd/clef/extapi_changelog.md
@@ -10,6 +10,64 @@ TL;DR: Given a version number MAJOR.MINOR.PATCH, increment the:

 Additional labels for pre-release and build metadata are available as extensions to the MAJOR.MINOR.PATCH format.

+### 6.1.0
+
+The API-method `account_signGnosisSafeTx` was added. This method takes two parameters, 
+`[address, safeTx]`. The latter, `safeTx`, can be copy-pasted from the gnosis relay. For example: 
+
+```
+{
+  "jsonrpc": "2.0",
+  "method": "account_signGnosisSafeTx",
+  "params": ["0xfd1c4226bfD1c436672092F4eCbfC270145b7256",
+    {
+      "safe": "0x25a6c4BBd32B2424A9c99aEB0584Ad12045382B3",
+      "to": "0xB372a646f7F05Cc1785018dBDA7EBc734a2A20E2",
+      "value": "20000000000000000",
+      "data": null,
+      "operation": 0,
+      "gasToken": "0x0000000000000000000000000000000000000000",
+      "safeTxGas": 27845,
+      "baseGas": 0,
+      "gasPrice": "0",
+      "refundReceiver": "0x0000000000000000000000000000000000000000",
+      "nonce": 2,
+      "executionDate": null,
+      "submissionDate": "2020-09-15T21:54:49.617634Z",
+      "modified": "2020-09-15T21:54:49.617634Z",
+      "blockNumber": null,
+      "transactionHash": null,
+      "safeTxHash": "0x2edfbd5bc113ff18c0631595db32eb17182872d88d9bf8ee4d8c2dd5db6d95e2",
+      "executor": null,
+      "isExecuted": false,
+      "isSuccessful": null,
+      "ethGasPrice": null,
+      "gasUsed": null,
+      "fee": null,
+      "origin": null,
+      "dataDecoded": null,
+      "confirmationsRequired": null,
+      "confirmations": [
+        {
+          "owner": "0xAd2e180019FCa9e55CADe76E4487F126Fd08DA34",
+          "submissionDate": "2020-09-15T21:54:49.663299Z",
+          "transactionHash": null,
+          "confirmationType": "CONFIRMATION",
+          "signature": "0x95a7250bb645f831c86defc847350e7faff815b2fb586282568e96cc859e39315876db20a2eed5f7a0412906ec5ab57652a6f645ad4833f345bda059b9da2b821c",
+          "signatureType": "EOA"
+        }
+      ],
+      "signatures": null
+    }
+  ],
+  "id": 67
+}
+```
+
+Not all fields are required, though. This method is really just a UX helper, which massages the 
+input to conform to the `EIP-712` [specification](https://docs.gnosis.io/safe/docs/contracts_tx_execution/#transaction-hash) 
+for the Gnosis Safe, and making the output be directly importable to by a relay service. 
+

 ### 6.0.0

--- a/cmd/clef/main.go
+++ b/cmd/clef/main.go
@@ -29,7 +29,6 @@ import (
 	"math/big"
 	"os"
 	"os/signal"
-	"os/user"
 	"path/filepath"
 	"runtime"
 	"sort"
@@ -55,7 +54,7 @@ import (
 	"github.com/ethereum/go-ethereum/signer/rules"
 	"github.com/ethereum/go-ethereum/signer/storage"

-	colorable "github.com/mattn/go-colorable"
+	"github.com/mattn/go-colorable"
 	"github.com/mattn/go-isatty"
 	"gopkg.in/urfave/cli.v1"
 )
@@ -108,11 +107,6 @@ var (
 		Usage: "HTTP-RPC server listening port",
 		Value: node.DefaultHTTPPort + 5,
 	}
-	legacyRPCPortFlag = cli.IntFlag{
-		Name:  "rpcport",
-		Usage: "HTTP-RPC server listening port (Deprecated, please use --http.port).",
-		Value: node.DefaultHTTPPort + 5,
-	}
 	signerSecretFlag = cli.StringFlag{
 		Name:  "signersecret",
 		Usage: "A file containing the (encrypted) master seed to encrypt Clef data, e.g. keystore credentials and ruleset hash",
@@ -251,12 +245,6 @@ var AppHelpFlagGroups = []flags.FlagGroup{
 			acceptFlag,
 		},
 	},
-	{
-		Name: "ALIASED (deprecated)",
-		Flags: []cli.Flag{
-			legacyRPCPortFlag,
-		},
-	},
 }

 func init() {
@@ -284,7 +272,6 @@ func init() {
 		testFlag,
 		advancedMode,
 		acceptFlag,
-		legacyRPCPortFlag,
 	}
 	app.Action = signer
 	app.Commands = []cli.Command{initCommand,
@@ -666,8 +653,8 @@ func signer(c *cli.Context) error {
 			Version:   "1.0"},
 	}
 	if c.GlobalBool(utils.HTTPEnabledFlag.Name) {
-		vhosts := splitAndTrim(c.GlobalString(utils.HTTPVirtualHostsFlag.Name))
-		cors := splitAndTrim(c.GlobalString(utils.HTTPCORSDomainFlag.Name))
+		vhosts := utils.SplitAndTrim(c.GlobalString(utils.HTTPVirtualHostsFlag.Name))
+		cors := utils.SplitAndTrim(c.GlobalString(utils.HTTPCORSDomainFlag.Name))

 		srv := rpc.NewServer()
 		err := node.RegisterApisFromWhitelist(rpcAPI, []string{"account"}, srv, false)
@@ -678,12 +665,6 @@ func signer(c *cli.Context) error {

 		// set port
 		port := c.Int(rpcPortFlag.Name)
-		if c.GlobalIsSet(legacyRPCPortFlag.Name) {
-			if !c.GlobalIsSet(rpcPortFlag.Name) {
-				port = c.Int(legacyRPCPortFlag.Name)
-			}
-			log.Warn("The flag --rpcport is deprecated and will be removed in the future, please use --http.port")
-		}

 		// start http server
 		httpEndpoint := fmt.Sprintf("%s:%d", c.GlobalString(utils.HTTPListenAddrFlag.Name), port)
@@ -736,21 +717,11 @@ func signer(c *cli.Context) error {
 	return nil
 }

-// splitAndTrim splits input separated by a comma
-// and trims excessive white space from the substrings.
-func splitAndTrim(input string) []string {
-	result := strings.Split(input, ",")
-	for i, r := range result {
-		result[i] = strings.TrimSpace(r)
-	}
-	return result
-}
-
 // DefaultConfigDir is the default config directory to use for the vaults and other
 // persistence requirements.
 func DefaultConfigDir() string {
 	// Try to place the data folder in the user's home dir
-	home := homeDir()
+	home := utils.HomeDir()
 	if home != "" {
 		if runtime.GOOS == "darwin" {
 			return filepath.Join(home, "Library", "Signer")
@@ -758,26 +729,15 @@ func DefaultConfigDir() string {
 			appdata := os.Getenv("APPDATA")
 			if appdata != "" {
 				return filepath.Join(appdata, "Signer")
-			} else {
-				return filepath.Join(home, "AppData", "Roaming", "Signer")
 			}
-		} else {
-			return filepath.Join(home, ".clef")
+			return filepath.Join(home, "AppData", "Roaming", "Signer")
 		}
+		return filepath.Join(home, ".clef")
 	}
 	// As we cannot guess a stable location, return empty and handle later
 	return ""
 }

-func homeDir() string {
-	if home := os.Getenv("HOME"); home != "" {
-		return home
-	}
-	if usr, err := user.Current(); err == nil {
-		return usr.HomeDir
-	}
-	return ""
-}
 func readMasterKey(ctx *cli.Context, ui core.UIClientAPI) ([]byte, error) {
 	var (
 		file      string
@@ -827,14 +787,16 @@ func readMasterKey(ctx *cli.Context, ui core.UIClientAPI) ([]byte, error) {

 // checkFile is a convenience function to check if a file
 // * exists
-// * is mode 0400
+// * is mode 0400 (unix only)
 func checkFile(filename string) error {
 	info, err := os.Stat(filename)
 	if err != nil {
 		return fmt.Errorf("failed stat on %s: %v", filename, err)
 	}
 	// Check the unix permission bits
-	if info.Mode().Perm()&0377 != 0 {
+	// However, on windows, we cannot use the unix perm-bits, see
+	// https://github.com/ethereum/go-ethereum/issues/20123
+	if runtime.GOOS != "windows" && info.Mode().Perm()&0377 != 0 {
 		return fmt.Errorf("file (%v) has insecure file permissions (%v)", filename, info.Mode().String())
 	}
 	return nil
@@ -1144,7 +1106,7 @@ func GenDoc(ctx *cli.Context) {

 		rlpdata := common.FromHex("0xf85d640101948a8eafb1cf62bfbeb1741769dae1a9dd47996192018026a0716bd90515acb1e68e5ac5867aa11a1e65399c3349d479f5fb698554ebc6f293a04e8a4ebfff434e971e0ef12c5bf3a881b06fd04fc3f8b8a7291fb67a26a1d4ed")
 		var tx types.Transaction
-		rlp.DecodeBytes(rlpdata, &tx)
+		tx.UnmarshalBinary(rlpdata)
 		add("OnApproved - SignTransactionResult", desc, &ethapi.SignTransactionResult{Raw: rlpdata, Tx: &tx})

 	}
--- a/cmd/devp2p/README.md
+++ b/cmd/devp2p/README.md
@@ -0,0 +1,117 @@
+# The devp2p command
+
+The devp2p command line tool is a utility for low-level peer-to-peer debugging and
+protocol development purposes. It can do many things.
+
+### ENR Decoding
+
+Use `devp2p enrdump <base64>` to verify and display an Ethereum Node Record.
+
+### Node Key Management
+
+The `devp2p key ...` command family deals with node key files.
+
+Run `devp2p key generate mynode.key` to create a new node key in the `mynode.key` file.
+
+Run `devp2p key to-enode mynode.key -ip 127.0.0.1 -tcp 30303` to create an enode:// URL
+corresponding to the given node key and address information.
+
+### Maintaining DNS Discovery Node Lists
+
+The devp2p command can create and publish DNS discovery node lists.
+
+Run `devp2p dns sign <directory>` to update the signature of a DNS discovery tree.
+
+Run `devp2p dns sync <enrtree-URL>` to download a complete DNS discovery tree.
+
+Run `devp2p dns to-cloudflare <directory>` to publish a tree to CloudFlare DNS.
+
+Run `devp2p dns to-route53 <directory>` to publish a tree to Amazon Route53.
+
+You can find more information about these commands in the [DNS Discovery Setup Guide][dns-tutorial].
+
+### Discovery v4 Utilities
+
+The `devp2p discv4 ...` command family deals with the [Node Discovery v4][discv4]
+protocol.
+
+Run `devp2p discv4 ping <enode/ENR>` to ping a node.
+
+Run `devp2p discv4 resolve <enode/ENR>` to find the most recent node record of a node in
+the DHT.
+
+Run `devp2p discv4 crawl <nodes.json path>` to create or update a JSON node set.
+
+### Discovery v5 Utilities
+
+The `devp2p discv5 ...` command family deals with the [Node Discovery v5][discv5]
+protocol. This protocol is currently under active development.
+
+Run `devp2p discv5 ping <ENR>` to ping a node.
+
+Run `devp2p discv5 resolve <ENR>` to find the most recent node record of a node in
+the discv5 DHT.
+
+Run `devp2p discv5 listen` to run a Discovery v5 node.
+
+Run `devp2p discv5 crawl <nodes.json path>` to create or update a JSON node set containing
+discv5 nodes.
+
+### Discovery Test Suites
+
+The devp2p command also contains interactive test suites for Discovery v4 and Discovery
+v5.
+
+To run these tests against your implementation, you need to set up a networking
+environment where two separate UDP listening addresses are available on the same machine.
+The two listening addresses must also be routed such that they are able to reach the node
+you want to test.
+
+For example, if you want to run the test on your local host, and the node under test is
+also on the local host, you need to assign two IP addresses (or a larger range) to your
+loopback interface. On macOS, this can be done by executing the following command:
+
+    sudo ifconfig lo0 add 127.0.0.2
+
+You can now run either test suite as follows: Start the node under test first, ensuring
+that it won't talk to the Internet (i.e. disable bootstrapping). An easy way to prevent
+unintended connections to the global DHT is listening on `127.0.0.1`.
+
+Now get the ENR of your node and store it in the `NODE` environment variable.
+
+Start the test by running `devp2p discv5 test -listen1 127.0.0.1 -listen2 127.0.0.2 $NODE`.
+
+### Eth Protocol Test Suite
+
+The Eth Protocol test suite is a conformance test suite for the [eth protocol][eth].
+
+To run the eth protocol test suite against your implementation, the node needs to be initialized as such:
+
+1. initialize the geth node with the `genesis.json` file contained in the `testdata` directory
+2. import the `halfchain.rlp` file in the `testdata` directory
+3. run geth with the following flags:
+```
+geth --datadir <datadir> --nodiscover --nat=none --networkid 19763 --verbosity 5
+```
+
+Then, run the following command, replacing `<enode>` with the enode of the geth node: 
+ ```
+ devp2p rlpx eth-test <enode> cmd/devp2p/internal/ethtest/testdata/chain.rlp cmd/devp2p/internal/ethtest/testdata/genesis.json
+```
+
+Repeat the above process (re-initialising the node) in order to run the Eth Protocol test suite again.
+
+#### Eth66 Test Suite
+
+The Eth66 test suite is also a conformance test suite for the eth 66 protocol version specifically. 
+To run the eth66 protocol test suite, initialize a geth node as described above and run the following command,
+replacing `<enode>` with the enode of the geth node:
+
+ ```
+ devp2p rlpx eth66-test <enode> cmd/devp2p/internal/ethtest/testdata/chain.rlp cmd/devp2p/internal/ethtest/testdata/genesis.json
+```
+
+[eth]: https://github.com/ethereum/devp2p/blob/master/caps/eth.md
+[dns-tutorial]: https://geth.ethereum.org/docs/developers/dns-discovery-setup
+[discv4]: https://github.com/ethereum/devp2p/tree/master/discv4.md
+[discv5]: https://github.com/ethereum/devp2p/tree/master/discv5/discv5.md
--- a/cmd/devp2p/discv4cmd.go
+++ b/cmd/devp2p/discv4cmd.go
@@ -19,14 +19,12 @@ package main
 import (
 	"fmt"
 	"net"
-	"os"
 	"strings"
 	"time"

 	"github.com/ethereum/go-ethereum/cmd/devp2p/internal/v4test"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/ethereum/go-ethereum/internal/utesting"
 	"github.com/ethereum/go-ethereum/p2p/discover"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/params"
@@ -82,7 +80,13 @@ var (
 		Name:   "test",
 		Usage:  "Runs tests against a node",
 		Action: discv4Test,
-		Flags:  []cli.Flag{remoteEnodeFlag, testPatternFlag, testListen1Flag, testListen2Flag},
+		Flags: []cli.Flag{
+			remoteEnodeFlag,
+			testPatternFlag,
+			testTAPFlag,
+			testListen1Flag,
+			testListen2Flag,
+		},
 	}
 )

@@ -113,20 +117,6 @@ var (
 		Usage:  "Enode of the remote node under test",
 		EnvVar: "REMOTE_ENODE",
 	}
-	testPatternFlag = cli.StringFlag{
-		Name:  "run",
-		Usage: "Pattern of test suite(s) to run",
-	}
-	testListen1Flag = cli.StringFlag{
-		Name:  "listen1",
-		Usage: "IP address of the first tester",
-		Value: v4test.Listen1,
-	}
-	testListen2Flag = cli.StringFlag{
-		Name:  "listen2",
-		Usage: "IP address of the second tester",
-		Value: v4test.Listen2,
-	}
 )

 func discv4Ping(ctx *cli.Context) error {
@@ -213,6 +203,7 @@ func discv4Crawl(ctx *cli.Context) error {
 	return nil
 }

+// discv4Test runs the protocol test suite.
 func discv4Test(ctx *cli.Context) error {
 	// Configure test package globals.
 	if !ctx.IsSet(remoteEnodeFlag.Name) {
@@ -221,18 +212,7 @@ func discv4Test(ctx *cli.Context) error {
 	v4test.Remote = ctx.String(remoteEnodeFlag.Name)
 	v4test.Listen1 = ctx.String(testListen1Flag.Name)
 	v4test.Listen2 = ctx.String(testListen2Flag.Name)
-
-	// Filter and run test cases.
-	tests := v4test.AllTests
-	if ctx.IsSet(testPatternFlag.Name) {
-		tests = utesting.MatchTests(tests, ctx.String(testPatternFlag.Name))
-	}
-	results := utesting.RunTests(tests, os.Stdout)
-	if fails := utesting.CountFailures(results); fails > 0 {
-		return fmt.Errorf("%v/%v tests passed.", len(tests)-fails, len(tests))
-	}
-	fmt.Printf("%v/%v passed\n", len(tests), len(tests))
-	return nil
+	return runTests(ctx, v4test.AllTests)
 }

 // startV4 starts an ephemeral discovery V4 node.
@@ -286,7 +266,11 @@ func listen(ln *enode.LocalNode, addr string) *net.UDPConn {
 	}
 	usocket := socket.(*net.UDPConn)
 	uaddr := socket.LocalAddr().(*net.UDPAddr)
-	ln.SetFallbackIP(net.IP{127, 0, 0, 1})
+	if uaddr.IP.IsUnspecified() {
+		ln.SetFallbackIP(net.IP{127, 0, 0, 1})
+	} else {
+		ln.SetFallbackIP(uaddr.IP)
+	}
 	ln.SetFallbackUDP(uaddr.Port)
 	return usocket
 }
@@ -294,7 +278,11 @@ func listen(ln *enode.LocalNode, addr string) *net.UDPConn {
 func parseBootnodes(ctx *cli.Context) ([]*enode.Node, error) {
 	s := params.RinkebyBootnodes
 	if ctx.IsSet(bootnodesFlag.Name) {
-		s = strings.Split(ctx.String(bootnodesFlag.Name), ",")
+		input := ctx.String(bootnodesFlag.Name)
+		if input == "" {
+			return nil, nil
+		}
+		s = strings.Split(input, ",")
 	}
 	nodes := make([]*enode.Node, len(s))
 	var err error
--- a/cmd/devp2p/discv5cmd.go
+++ b/cmd/devp2p/discv5cmd.go
@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"time"

+	"github.com/ethereum/go-ethereum/cmd/devp2p/internal/v5test"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/p2p/discover"
 	"gopkg.in/urfave/cli.v1"
@@ -33,6 +34,7 @@ var (
 			discv5PingCommand,
 			discv5ResolveCommand,
 			discv5CrawlCommand,
+			discv5TestCommand,
 			discv5ListenCommand,
 		},
 	}
@@ -53,6 +55,17 @@ var (
 		Action: discv5Crawl,
 		Flags:  []cli.Flag{bootnodesFlag, crawlTimeoutFlag},
 	}
+	discv5TestCommand = cli.Command{
+		Name:   "test",
+		Usage:  "Runs protocol tests against a node",
+		Action: discv5Test,
+		Flags: []cli.Flag{
+			testPatternFlag,
+			testTAPFlag,
+			testListen1Flag,
+			testListen2Flag,
+		},
+	}
 	discv5ListenCommand = cli.Command{
 		Name:   "listen",
 		Usage:  "Runs a node",
@@ -103,6 +116,16 @@ func discv5Crawl(ctx *cli.Context) error {
 	return nil
 }

+// discv5Test runs the protocol test suite.
+func discv5Test(ctx *cli.Context) error {
+	suite := &v5test.Suite{
+		Dest:    getNodeArg(ctx),
+		Listen1: ctx.String(testListen1Flag.Name),
+		Listen2: ctx.String(testListen2Flag.Name),
+	}
+	return runTests(ctx, suite.AllTests())
+}
+
 func discv5Listen(ctx *cli.Context) error {
 	disc := startV5(ctx)
 	defer disc.Close()
--- a/cmd/devp2p/dnscmd.go
+++ b/cmd/devp2p/dnscmd.go
@@ -30,7 +30,7 @@ import (
 	"github.com/ethereum/go-ethereum/console/prompt"
 	"github.com/ethereum/go-ethereum/p2p/dnsdisc"
 	"github.com/ethereum/go-ethereum/p2p/enode"
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )

 var (
--- a/cmd/devp2p/internal/ethtest/chain.go
+++ b/cmd/devp2p/internal/ethtest/chain.go
@@ -0,0 +1,167 @@
+// 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 (
+	"compress/gzip"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"math/big"
+	"os"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/forkid"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/rlp"
+)
+
+type Chain struct {
+	blocks      []*types.Block
+	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
+	sum := big.NewInt(0)
+	for _, block := range c.blocks[:height] {
+		sum.Add(sum, block.Difficulty())
+	}
+	return sum
+}
+
+// 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()))
+}
+
+// Shorten returns a copy chain of a desired height from the imported
+func (c *Chain) Shorten(height int) *Chain {
+	blocks := make([]*types.Block, height)
+	copy(blocks, c.blocks[:height])
+
+	config := *c.chainConfig
+	return &Chain{
+		blocks:      blocks,
+		chainConfig: &config,
+	}
+}
+
+// Head returns the chain head.
+func (c *Chain) Head() *types.Block {
+	return c.blocks[c.Len()-1]
+}
+
+func (c *Chain) GetHeaders(req GetBlockHeaders) (BlockHeaders, error) {
+	if req.Amount < 1 {
+		return nil, fmt.Errorf("no block headers requested")
+	}
+
+	headers := make(BlockHeaders, req.Amount)
+	var blockNumber uint64
+
+	// range over blocks to check if our chain has the requested header
+	for _, block := range c.blocks {
+		if block.Hash() == req.Origin.Hash || block.Number().Uint64() == req.Origin.Number {
+			headers[0] = block.Header()
+			blockNumber = block.Number().Uint64()
+		}
+	}
+	if headers[0] == nil {
+		return nil, fmt.Errorf("no headers found for given origin number %v, hash %v", req.Origin.Number, req.Origin.Hash)
+	}
+
+	if req.Reverse {
+		for i := 1; i < int(req.Amount); i++ {
+			blockNumber -= (1 - req.Skip)
+			headers[i] = c.blocks[blockNumber].Header()
+
+		}
+
+		return headers, nil
+	}
+
+	for i := 1; i < int(req.Amount); i++ {
+		blockNumber += (1 + req.Skip)
+		headers[i] = c.blocks[blockNumber].Header()
+	}
+
+	return headers, nil
+}
+
+// loadChain takes the given chain.rlp file, and decodes and returns
+// the blocks from the file.
+func loadChain(chainfile string, genesis string) (*Chain, error) {
+	chainConfig, err := ioutil.ReadFile(genesis)
+	if err != nil {
+		return nil, err
+	}
+	var gen core.Genesis
+	if err := json.Unmarshal(chainConfig, &gen); err != nil {
+		return nil, err
+	}
+	gblock := gen.ToBlock(nil)
+
+	// Load chain.rlp.
+	fh, err := os.Open(chainfile)
+	if err != nil {
+		return nil, err
+	}
+	defer fh.Close()
+	var reader io.Reader = fh
+	if strings.HasSuffix(chainfile, ".gz") {
+		if reader, err = gzip.NewReader(reader); err != nil {
+			return nil, err
+		}
+	}
+	stream := rlp.NewStream(reader, 0)
+	var blocks = make([]*types.Block, 1)
+	blocks[0] = gblock
+	for i := 0; ; i++ {
+		var b types.Block
+		if err := stream.Decode(&b); err == io.EOF {
+			break
+		} else if err != nil {
+			return nil, fmt.Errorf("at block index %d: %v", i, err)
+		}
+		if b.NumberU64() != uint64(i+1) {
+			return nil, fmt.Errorf("block at index %d has wrong number %d", i, b.NumberU64())
+		}
+		blocks = append(blocks, &b)
+	}
+
+	c := &Chain{blocks: blocks, chainConfig: gen.Config}
+	return c, nil
+}
--- a/cmd/devp2p/internal/ethtest/chain_test.go
+++ b/cmd/devp2p/internal/ethtest/chain_test.go
@@ -0,0 +1,151 @@
+// 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 (
+	"path/filepath"
+	"strconv"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/eth/protocols/eth"
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/stretchr/testify/assert"
+)
+
+// TestEthProtocolNegotiation tests whether the test suite
+// can negotiate the highest eth protocol in a status message exchange
+func TestEthProtocolNegotiation(t *testing.T) {
+	var tests = []struct {
+		conn     *Conn
+		caps     []p2p.Cap
+		expected uint32
+	}{
+		{
+			conn: &Conn{},
+			caps: []p2p.Cap{
+				{Name: "eth", Version: 63},
+				{Name: "eth", Version: 64},
+				{Name: "eth", Version: 65},
+			},
+			expected: uint32(65),
+		},
+		{
+			conn: &Conn{},
+			caps: []p2p.Cap{
+				{Name: "eth", Version: 0},
+				{Name: "eth", Version: 89},
+				{Name: "eth", Version: 65},
+			},
+			expected: uint32(65),
+		},
+		{
+			conn: &Conn{},
+			caps: []p2p.Cap{
+				{Name: "eth", Version: 63},
+				{Name: "eth", Version: 64},
+				{Name: "wrongProto", Version: 65},
+			},
+			expected: uint32(64),
+		},
+	}
+
+	for i, tt := range tests {
+		t.Run(strconv.Itoa(i), func(t *testing.T) {
+			tt.conn.negotiateEthProtocol(tt.caps)
+			assert.Equal(t, tt.expected, uint32(tt.conn.ethProtocolVersion))
+		})
+	}
+}
+
+// TestChain_GetHeaders tests whether the test suite can correctly
+// respond to a GetBlockHeaders request from a node.
+func TestChain_GetHeaders(t *testing.T) {
+	chainFile, err := filepath.Abs("./testdata/chain.rlp")
+	if err != nil {
+		t.Fatal(err)
+	}
+	genesisFile, err := filepath.Abs("./testdata/genesis.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	chain, err := loadChain(chainFile, genesisFile)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var tests = []struct {
+		req      GetBlockHeaders
+		expected BlockHeaders
+	}{
+		{
+			req: GetBlockHeaders{
+				Origin: eth.HashOrNumber{
+					Number: uint64(2),
+				},
+				Amount:  uint64(5),
+				Skip:    1,
+				Reverse: false,
+			},
+			expected: BlockHeaders{
+				chain.blocks[2].Header(),
+				chain.blocks[4].Header(),
+				chain.blocks[6].Header(),
+				chain.blocks[8].Header(),
+				chain.blocks[10].Header(),
+			},
+		},
+		{
+			req: GetBlockHeaders{
+				Origin: eth.HashOrNumber{
+					Number: uint64(chain.Len() - 1),
+				},
+				Amount:  uint64(3),
+				Skip:    0,
+				Reverse: true,
+			},
+			expected: BlockHeaders{
+				chain.blocks[chain.Len()-1].Header(),
+				chain.blocks[chain.Len()-2].Header(),
+				chain.blocks[chain.Len()-3].Header(),
+			},
+		},
+		{
+			req: GetBlockHeaders{
+				Origin: eth.HashOrNumber{
+					Hash: chain.Head().Hash(),
+				},
+				Amount:  uint64(1),
+				Skip:    0,
+				Reverse: false,
+			},
+			expected: BlockHeaders{
+				chain.Head().Header(),
+			},
+		},
+	}
+
+	for i, tt := range tests {
+		t.Run(strconv.Itoa(i), func(t *testing.T) {
+			headers, err := chain.GetHeaders(tt.req)
+			if err != nil {
+				t.Fatal(err)
+			}
+			assert.Equal(t, headers, tt.expected)
+		})
+	}
+}
--- a/cmd/devp2p/internal/ethtest/eth66_suite.go
+++ b/cmd/devp2p/internal/ethtest/eth66_suite.go
@@ -0,0 +1,382 @@
+// 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/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"
+)
+
+// 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)
+	// 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)
+	// 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 := s.getBlockHeaders66(t, conn, req, req.RequestId)
+	// check for correct headers
+	headersMatch(t, s.chain, headers)
+}
+
+// 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
+	conn1, conn2 := s.setupConnection66(t), s.setupConnection66(t)
+	// 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,
+		},
+	}
+	// wait for headers for first request
+	headerChan := make(chan BlockHeaders, 1)
+	go func(headers chan BlockHeaders) {
+		headers <- s.getBlockHeaders66(t, conn1, req1, req1.RequestId)
+	}(headerChan)
+	// check headers of second request
+	headersMatch(t, s.chain, s.getBlockHeaders66(t, conn2, req2, req2.RequestId))
+	// check headers of first request
+	headersMatch(t, s.chain, <-headerChan)
+}
+
+// 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) {
+	sendConn, receiveConn := s.setupConnection66(t), s.setupConnection66(t)
+	nextBlock := len(s.chain.blocks)
+	blockAnnouncement := &NewBlock{
+		Block: s.fullChain.blocks[nextBlock],
+		TD:    s.fullChain.TD(nextBlock + 1),
+	}
+	s.testAnnounce66(t, sendConn, receiveConn, blockAnnouncement)
+	// update test suite chain
+	s.chain.blocks = append(s.chain.blocks, s.fullChain.blocks[nextBlock])
+	// wait for client to update its chain
+	if err := receiveConn.waitForBlock66(s.chain.Head()); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// 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)
+	// 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, timeout).(type) {
+		case *Disconnect:
+		case *Error:
+			break
+		default:
+			t.Fatalf("unexpected: %s wanted disconnect", pretty.Sdump(msg))
+		}
+	}
+	// Test the last block as a valid block
+	sendConn := s.setupConnection66(t)
+	receiveConn := s.setupConnection66(t)
+	s.testAnnounce66(t, sendConn, receiveConn, blocks[3])
+	// update test suite chain
+	s.chain.blocks = append(s.chain.blocks, s.fullChain.blocks[nextBlock])
+	// wait for client to update its chain
+	if err := receiveConn.waitForBlock66(s.fullChain.blocks[nextBlock]); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// TestMaliciousHandshake_66 tries to send malicious data during the handshake.
+func (s *Suite) TestMaliciousHandshake_66(t *utesting.T) {
+	conn := s.dial66(t)
+	// 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)
+	// 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) {
+	tests := []*types.Transaction{
+		getOldTxFromChain(t, s),
+		invalidNonceTx(t, s),
+		hugeAmount(t, s),
+		hugeGasPrice(t, s),
+		hugeData(t, s),
+	}
+	for i, tx := range tests {
+		t.Logf("Testing malicious tx propagation: %v\n", i)
+		sendFailingTx66(t, s, tx)
+	}
+}
+
+// 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)
+	req := &eth.GetBlockHeadersPacket66{
+		RequestId: 0,
+		GetBlockHeadersPacket: &eth.GetBlockHeadersPacket{
+			Origin: eth.HashOrNumber{
+				Number: 0,
+			},
+			Amount: 2,
+		},
+	}
+	headersMatch(t, s.chain, s.getBlockHeaders66(t, conn, req, req.RequestId))
+}
+
+// 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 separate requests with same ID
+	reqID := uint64(1234)
+	req1 := &eth.GetBlockHeadersPacket66{
+		RequestId: reqID,
+		GetBlockHeadersPacket: &eth.GetBlockHeadersPacket{
+			Origin: eth.HashOrNumber{
+				Number: 0,
+			},
+			Amount: 2,
+		},
+	}
+	req2 := &eth.GetBlockHeadersPacket66{
+		RequestId: reqID,
+		GetBlockHeadersPacket: &eth.GetBlockHeadersPacket{
+			Origin: eth.HashOrNumber{
+				Number: 33,
+			},
+			Amount: 2,
+		},
+	}
+	// send requests concurrently
+	go func() {
+		headersMatch(t, s.chain, s.getBlockHeaders66(t, conn, req2, reqID))
+	}()
+	// check response from first request
+	headersMatch(t, s.chain, s.getBlockHeaders66(t, conn, req1, reqID))
+}
--- a/cmd/devp2p/internal/ethtest/eth66_suiteHelpers.go
+++ b/cmd/devp2p/internal/ethtest/eth66_suiteHelpers.go
@@ -0,0 +1,270 @@
+// 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"
+	"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})
+	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)
+	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))
+}
+
+// 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 {
+		timeout := time.Now().Add(10 * time.Second)
+		c.SetReadDeadline(timeout)
+
+		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)
+			}
+
+			if err := c.Write(headers); 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) {
+	timeout := 20 * time.Second
+	_, 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",
+		)
+	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",
+		)
+	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{})
+
+	timeout := time.Now().Add(20 * time.Second)
+	c.SetReadDeadline(timeout)
+	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)
+			}
+			if len(msg) > 0 {
+				return nil
+			}
+			time.Sleep(100 * time.Millisecond)
+		default:
+			return fmt.Errorf("invalid message: %s", pretty.Sdump(msg))
+		}
+	}
+}
+
+func sendSuccessfulTx66(t *utesting.T, s *Suite, tx *types.Transaction) {
+	sendConn := s.setupConnection66(t)
+	sendSuccessfulTxWithConn(t, s, tx, sendConn)
+}
+
+func sendFailingTx66(t *utesting.T, s *Suite, tx *types.Transaction) {
+	sendConn, recvConn := s.setupConnection66(t), s.setupConnection66(t)
+	sendFailingTxWithConns(t, s, tx, sendConn, recvConn)
+}
+
+func (s *Suite) getBlockHeaders66(t *utesting.T, conn *Conn, req eth.Packet, expectedID uint64) BlockHeaders {
+	if err := conn.write66(req, GetBlockHeaders{}.Code()); err != nil {
+		t.Fatalf("could not write to connection: %v", err)
+	}
+	// check block headers response
+	reqID, msg := conn.readAndServe66(s.chain, timeout)
+
+	switch msg := msg.(type) {
+	case BlockHeaders:
+		if reqID != expectedID {
+			t.Fatalf("request ID mismatch: wanted %d, got %d", expectedID, reqID)
+		}
+		return msg
+	default:
+		t.Fatalf("unexpected: %s", pretty.Sdump(msg))
+		return nil
+	}
+}
+
+func headersMatch(t *utesting.T, chain *Chain, headers BlockHeaders) {
+	for _, header := range headers {
+		num := header.Number.Uint64()
+		t.Logf("received header (%d): %s", num, pretty.Sdump(header.Hash()))
+		assert.Equal(t, chain.blocks[int(num)].Header(), header)
+	}
+}
--- a/cmd/devp2p/internal/ethtest/large.go
+++ b/cmd/devp2p/internal/ethtest/large.go
@@ -0,0 +1,80 @@
+// 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 (
+	"crypto/rand"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+// largeNumber returns a very large big.Int.
+func largeNumber(megabytes int) *big.Int {
+	buf := make([]byte, megabytes*1024*1024)
+	rand.Read(buf)
+	bigint := new(big.Int)
+	bigint.SetBytes(buf)
+	return bigint
+}
+
+// largeBuffer returns a very large buffer.
+func largeBuffer(megabytes int) []byte {
+	buf := make([]byte, megabytes*1024*1024)
+	rand.Read(buf)
+	return buf
+}
+
+// largeString returns a very large string.
+func largeString(megabytes int) string {
+	buf := make([]byte, megabytes*1024*1024)
+	rand.Read(buf)
+	return hexutil.Encode(buf)
+}
+
+func largeBlock() *types.Block {
+	return types.NewBlockWithHeader(largeHeader())
+}
+
+// Returns a random hash
+func randHash() common.Hash {
+	var h common.Hash
+	rand.Read(h[:])
+	return h
+}
+
+func largeHeader() *types.Header {
+	return &types.Header{
+		MixDigest:   randHash(),
+		ReceiptHash: randHash(),
+		TxHash:      randHash(),
+		Nonce:       types.BlockNonce{},
+		Extra:       []byte{},
+		Bloom:       types.Bloom{},
+		GasUsed:     0,
+		Coinbase:    common.Address{},
+		GasLimit:    0,
+		UncleHash:   randHash(),
+		Time:        1337,
+		ParentHash:  randHash(),
+		Root:        randHash(),
+		Number:      largeNumber(2),
+		Difficulty:  largeNumber(2),
+	}
+}
--- a/cmd/devp2p/internal/ethtest/suite.go
+++ b/cmd/devp2p/internal/ethtest/suite.go
@@ -0,0 +1,450 @@
+// 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"
+	"time"
+
+	"github.com/davecgh/go-spew/spew"
+	"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/enode"
+	"github.com/ethereum/go-ethereum/p2p/rlpx"
+	"github.com/stretchr/testify/assert"
+)
+
+var pretty = spew.ConfigState{
+	Indent:                  "  ",
+	DisableCapacities:       true,
+	DisablePointerAddresses: true,
+	SortKeys:                true,
+}
+
+var timeout = 20 * time.Second
+
+// Suite represents a structure used to test the eth
+// protocol of a node(s).
+type Suite struct {
+	Dest *enode.Node
+
+	chain     *Chain
+	fullChain *Chain
+}
+
+// NewSuite creates and returns a new eth-test suite that can
+// be used to test the given node against the given blockchain
+// data.
+func NewSuite(dest *enode.Node, chainfile string, genesisfile string) (*Suite, error) {
+	chain, err := loadChain(chainfile, genesisfile)
+	if err != nil {
+		return nil, err
+	}
+	return &Suite{
+		Dest:      dest,
+		chain:     chain.Shorten(1000),
+		fullChain: chain,
+	}, nil
+}
+
+func (s *Suite) EthTests() []utesting.Test {
+	return []utesting.Test{
+		// status
+		{Name: "Status", Fn: s.TestStatus},
+		{Name: "Status_66", Fn: s.TestStatus_66},
+		// get block headers
+		{Name: "GetBlockHeaders", Fn: s.TestGetBlockHeaders},
+		{Name: "GetBlockHeaders_66", Fn: s.TestGetBlockHeaders_66},
+		{Name: "TestSimultaneousRequests_66", Fn: s.TestSimultaneousRequests_66},
+		{Name: "TestSameRequestID_66", Fn: s.TestSameRequestID_66},
+		{Name: "TestZeroRequestID_66", Fn: s.TestZeroRequestID_66},
+		// get block bodies
+		{Name: "GetBlockBodies", Fn: s.TestGetBlockBodies},
+		{Name: "GetBlockBodies_66", Fn: s.TestGetBlockBodies_66},
+		// broadcast
+		{Name: "Broadcast", Fn: s.TestBroadcast},
+		{Name: "Broadcast_66", Fn: s.TestBroadcast_66},
+		{Name: "TestLargeAnnounce", Fn: s.TestLargeAnnounce},
+		{Name: "TestLargeAnnounce_66", Fn: s.TestLargeAnnounce_66},
+		// malicious handshakes + status
+		{Name: "TestMaliciousHandshake", Fn: s.TestMaliciousHandshake},
+		{Name: "TestMaliciousStatus", Fn: s.TestMaliciousStatus},
+		{Name: "TestMaliciousHandshake_66", Fn: s.TestMaliciousHandshake_66},
+		{Name: "TestMaliciousStatus_66", Fn: s.TestMaliciousStatus},
+		// test transactions
+		{Name: "TestTransactions", Fn: s.TestTransaction},
+		{Name: "TestTransactions_66", Fn: s.TestTransaction_66},
+		{Name: "TestMaliciousTransactions", Fn: s.TestMaliciousTx},
+		{Name: "TestMaliciousTransactions_66", Fn: s.TestMaliciousTx_66},
+	}
+}
+
+// TestStatus attempts to connect to the given node and exchange
+// a status message with it, and then check to make sure
+// the chain head is correct.
+func (s *Suite) TestStatus(t *utesting.T) {
+	conn, err := s.dial()
+	if err != nil {
+		t.Fatalf("could not dial: %v", err)
+	}
+	// get protoHandshake
+	conn.handshake(t)
+	// get status
+	switch msg := conn.statusExchange(t, s.chain, nil).(type) {
+	case *Status:
+		t.Logf("got status message: %s", pretty.Sdump(msg))
+	default:
+		t.Fatalf("unexpected: %s", pretty.Sdump(msg))
+	}
+}
+
+// TestMaliciousStatus sends a status package with a large total difficulty.
+func (s *Suite) TestMaliciousStatus(t *utesting.T) {
+	conn, err := s.dial()
+	if err != nil {
+		t.Fatalf("could not dial: %v", err)
+	}
+	// get protoHandshake
+	conn.handshake(t)
+	status := &Status{
+		ProtocolVersion: uint32(conn.ethProtocolVersion),
+		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))
+	}
+}
+
+// TestGetBlockHeaders tests whether the given node can respond to
+// a `GetBlockHeaders` request and that the response is accurate.
+func (s *Suite) TestGetBlockHeaders(t *utesting.T) {
+	conn, err := s.dial()
+	if err != nil {
+		t.Fatalf("could not dial: %v", err)
+	}
+
+	conn.handshake(t)
+	conn.statusExchange(t, s.chain, nil)
+
+	// get block headers
+	req := &GetBlockHeaders{
+		Origin: eth.HashOrNumber{
+			Hash: s.chain.blocks[1].Hash(),
+		},
+		Amount:  2,
+		Skip:    1,
+		Reverse: false,
+	}
+
+	if err := conn.Write(req); err != nil {
+		t.Fatalf("could not write to connection: %v", err)
+	}
+
+	switch msg := conn.ReadAndServe(s.chain, timeout).(type) {
+	case *BlockHeaders:
+		headers := *msg
+		for _, header := range headers {
+			num := header.Number.Uint64()
+			t.Logf("received header (%d): %s", num, pretty.Sdump(header.Hash()))
+			assert.Equal(t, s.chain.blocks[int(num)].Header(), header)
+		}
+	default:
+		t.Fatalf("unexpected: %s", pretty.Sdump(msg))
+	}
+}
+
+// TestGetBlockBodies tests whether the given node can respond to
+// a `GetBlockBodies` request and that the response is accurate.
+func (s *Suite) TestGetBlockBodies(t *utesting.T) {
+	conn, err := s.dial()
+	if err != nil {
+		t.Fatalf("could not dial: %v", err)
+	}
+
+	conn.handshake(t)
+	conn.statusExchange(t, s.chain, nil)
+	// create block bodies request
+	req := &GetBlockBodies{
+		s.chain.blocks[54].Hash(),
+		s.chain.blocks[75].Hash(),
+	}
+	if err := conn.Write(req); err != nil {
+		t.Fatalf("could not write to connection: %v", err)
+	}
+
+	switch msg := conn.ReadAndServe(s.chain, timeout).(type) {
+	case *BlockBodies:
+		t.Logf("received %d block bodies", len(*msg))
+	default:
+		t.Fatalf("unexpected: %s", pretty.Sdump(msg))
+	}
+}
+
+// TestBroadcast tests whether a block announcement is correctly
+// propagated to the given node's peer(s).
+func (s *Suite) TestBroadcast(t *utesting.T) {
+	sendConn, receiveConn := s.setupConnection(t), s.setupConnection(t)
+	nextBlock := len(s.chain.blocks)
+	blockAnnouncement := &NewBlock{
+		Block: s.fullChain.blocks[nextBlock],
+		TD:    s.fullChain.TD(nextBlock + 1),
+	}
+	s.testAnnounce(t, sendConn, receiveConn, blockAnnouncement)
+	// update test suite chain
+	s.chain.blocks = append(s.chain.blocks, s.fullChain.blocks[nextBlock])
+	// wait for client to update its chain
+	if err := receiveConn.waitForBlock(s.chain.Head()); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// TestMaliciousHandshake tries to send malicious data during the handshake.
+func (s *Suite) TestMaliciousHandshake(t *utesting.T) {
+	conn, err := s.dial()
+	if err != nil {
+		t.Fatalf("could not dial: %v", err)
+	}
+	// 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)
+		// 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 send concurrently, so ignore them
+				continue
+			default:
+				t.Fatalf("unexpected: %s", pretty.Sdump(msg))
+			}
+		}
+		// Dial for the next round
+		conn, err = s.dial()
+		if err != nil {
+			t.Fatalf("could not dial: %v", err)
+		}
+	}
+}
+
+// TestLargeAnnounce tests the announcement mechanism with a large block.
+func (s *Suite) TestLargeAnnounce(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.setupConnection(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, timeout).(type) {
+		case *Disconnect:
+		case *Error:
+			break
+		default:
+			t.Fatalf("unexpected: %s wanted disconnect", pretty.Sdump(msg))
+		}
+	}
+	// Test the last block as a valid block
+	sendConn := s.setupConnection(t)
+	receiveConn := s.setupConnection(t)
+	s.testAnnounce(t, sendConn, receiveConn, blocks[3])
+	// update test suite chain
+	s.chain.blocks = append(s.chain.blocks, s.fullChain.blocks[nextBlock])
+	// wait for client to update its chain
+	if err := receiveConn.waitForBlock(s.fullChain.blocks[nextBlock]); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func (s *Suite) testAnnounce(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.waitAnnounce(t, receiveConn, blockAnnouncement)
+}
+
+func (s *Suite) waitAnnounce(t *utesting.T, conn *Conn, blockAnnouncement *NewBlock) {
+	timeout := 20 * time.Second
+	switch msg := conn.ReadAndServe(s.chain, timeout).(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",
+		)
+	case *NewBlockHashes:
+		message := *msg
+		t.Logf("received NewBlockHashes message: %s", pretty.Sdump(message))
+		assert.Equal(t, blockAnnouncement.Block.Hash(), message[0].Hash,
+			"wrong block hash in announcement",
+		)
+	default:
+		t.Fatalf("unexpected: %s", pretty.Sdump(msg))
+	}
+}
+
+func (s *Suite) setupConnection(t *utesting.T) *Conn {
+	// create conn
+	sendConn, err := s.dial()
+	if err != nil {
+		t.Fatalf("could not dial: %v", err)
+	}
+	sendConn.handshake(t)
+	sendConn.statusExchange(t, s.chain, nil)
+	return sendConn
+}
+
+// dial attempts to dial the given node and perform a handshake,
+// returning the created Conn if successful.
+func (s *Suite) dial() (*Conn, error) {
+	var conn Conn
+	// dial
+	fd, err := net.Dial("tcp", fmt.Sprintf("%v:%d", s.Dest.IP(), s.Dest.TCP()))
+	if err != nil {
+		return nil, err
+	}
+	conn.Conn = rlpx.NewConn(fd, s.Dest.Pubkey())
+	// do encHandshake
+	conn.ourKey, _ = crypto.GenerateKey()
+	_, err = conn.Handshake(conn.ourKey)
+	if err != nil {
+		return nil, err
+	}
+	// set default p2p capabilities
+	conn.caps = []p2p.Cap{
+		{Name: "eth", Version: 64},
+		{Name: "eth", Version: 65},
+	}
+	return &conn, nil
+}
+
+func (s *Suite) TestTransaction(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)
+		sendSuccessfulTx(t, s, tx)
+	}
+}
+
+func (s *Suite) TestMaliciousTx(t *utesting.T) {
+	tests := []*types.Transaction{
+		getOldTxFromChain(t, s),
+		invalidNonceTx(t, s),
+		hugeAmount(t, s),
+		hugeGasPrice(t, s),
+		hugeData(t, s),
+	}
+	for i, tx := range tests {
+		t.Logf("Testing malicious tx propagation: %v\n", i)
+		sendFailingTx(t, s, tx)
+	}
+}
--- a/cmd/devp2p/internal/ethtest/testdata/chain.rlp
+++ b/cmd/devp2p/internal/ethtest/testdata/chain.rlp
--- a/cmd/devp2p/internal/ethtest/testdata/genesis.json
+++ b/cmd/devp2p/internal/ethtest/testdata/genesis.json
@@ -0,0 +1,26 @@
+{
+    "config": {
+        "chainId": 19763,
+        "homesteadBlock": 0,
+        "eip150Block": 0,
+        "eip155Block": 0,
+        "eip158Block": 0,
+        "byzantiumBlock": 0,
+        "ethash": {}
+    },
+    "nonce": "0xdeadbeefdeadbeef",
+    "timestamp": "0x0",
+    "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000",
+    "gasLimit": "0x80000000",
+    "difficulty": "0x20000",
+    "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+    "coinbase": "0x0000000000000000000000000000000000000000",
+    "alloc": {
+        "71562b71999873db5b286df957af199ec94617f7": {
+            "balance": "0xffffffffffffffffffffffffff"
+        }
+    },
+    "number": "0x0",
+    "gasUsed": "0x0",
+    "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000"
+}
--- a/cmd/devp2p/internal/ethtest/testdata/halfchain.rlp
+++ b/cmd/devp2p/internal/ethtest/testdata/halfchain.rlp
--- a/cmd/devp2p/internal/ethtest/transaction.go
+++ b/cmd/devp2p/internal/ethtest/transaction.go
@@ -0,0 +1,189 @@
+// 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 (
+	"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/internal/utesting"
+)
+
+//var faucetAddr = common.HexToAddress("0x71562b71999873DB5b286dF957af199Ec94617F7")
+var faucetKey, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
+
+func sendSuccessfulTx(t *utesting.T, s *Suite, tx *types.Transaction) {
+	sendConn := s.setupConnection(t)
+	sendSuccessfulTxWithConn(t, s, tx, sendConn)
+}
+
+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())
+	// Send the transaction
+	if err := sendConn.Write(&Transactions{tx}); err != nil {
+		t.Fatal(err)
+	}
+	time.Sleep(100 * time.Millisecond)
+	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
+			}
+		}
+		t.Fatalf("missing transaction: got %v missing %v", recTxs, tx.Hash())
+	case *NewPooledTransactionHashes:
+		txHashes := *msg
+		for _, gotHash := range txHashes {
+			if gotHash == tx.Hash() {
+				return
+			}
+		}
+		t.Fatalf("missing transaction announcement: got %v missing %v", txHashes, tx.Hash())
+	default:
+		t.Fatalf("unexpected message in sendSuccessfulTx: %s", pretty.Sdump(msg))
+	}
+}
+
+func sendFailingTx(t *utesting.T, s *Suite, tx *types.Transaction) {
+	sendConn, recvConn := s.setupConnection(t), s.setupConnection(t)
+	sendFailingTxWithConns(t, s, tx, sendConn, recvConn)
+}
+
+func sendFailingTxWithConns(t *utesting.T, s *Suite, tx *types.Transaction, sendConn, recvConn *Conn) {
+	// Wait for a transaction announcement
+	switch msg := recvConn.ReadAndServe(s.chain, timeout).(type) {
+	case *NewPooledTransactionHashes:
+		break
+	default:
+		t.Logf("unexpected message, logging: %v", pretty.Sdump(msg))
+	}
+	// Send the transaction
+	if err := sendConn.Write(&Transactions{tx}); err != nil {
+		t.Fatal(err)
+	}
+	// Wait for another transaction announcement
+	switch msg := recvConn.ReadAndServe(s.chain, timeout).(type) {
+	case *Transactions:
+		t.Fatalf("Received unexpected transaction announcement: %v", msg)
+	case *NewPooledTransactionHashes:
+		t.Fatalf("Received unexpected pooledTx announcement: %v", msg)
+	case *Error:
+		// Transaction should not be announced -> wait for timeout
+		return
+	default:
+		t.Fatalf("unexpected message in sendFailingTx: %s", pretty.Sdump(msg))
+	}
+}
+
+func unknownTx(t *utesting.T, s *Suite) *types.Transaction {
+	tx := getNextTxFromChain(t, s)
+	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, txNew)
+}
+
+func getNextTxFromChain(t *utesting.T, 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
+		}
+	}
+	if tx == nil {
+		t.Fatal("could not find transaction")
+	}
+	return tx
+}
+
+func getOldTxFromChain(t *utesting.T, s *Suite) *types.Transaction {
+	var tx *types.Transaction
+	for _, blocks := range s.fullChain.blocks[:s.chain.Len()-1] {
+		txs := blocks.Transactions()
+		if txs.Len() != 0 {
+			tx = txs[0]
+			break
+		}
+	}
+	if tx == nil {
+		t.Fatal("could not find transaction")
+	}
+	return tx
+}
+
+func invalidNonceTx(t *utesting.T, s *Suite) *types.Transaction {
+	tx := getNextTxFromChain(t, s)
+	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, txNew)
+}
+
+func hugeAmount(t *utesting.T, s *Suite) *types.Transaction {
+	tx := getNextTxFromChain(t, s)
+	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, txNew)
+}
+
+func hugeGasPrice(t *utesting.T, s *Suite) *types.Transaction {
+	tx := getNextTxFromChain(t, s)
+	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, txNew)
+}
+
+func hugeData(t *utesting.T, s *Suite) *types.Transaction {
+	tx := getNextTxFromChain(t, s)
+	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, txNew)
+}
+
+func signWithFaucet(t *utesting.T, tx *types.Transaction) *types.Transaction {
+	signer := types.HomesteadSigner{}
+	signedTx, err := types.SignTx(tx, signer, faucetKey)
+	if err != nil {
+		t.Fatalf("could not sign tx: %v\n", err)
+	}
+	return signedTx
+}
--- a/cmd/devp2p/internal/ethtest/types.go
+++ b/cmd/devp2p/internal/ethtest/types.go
@@ -0,0 +1,341 @@
+// 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 (
+	"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"
+)
+
+type Message interface {
+	Code() int
+}
+
+type Error struct {
+	err error
+}
+
+func (e *Error) Unwrap() error  { return e.err }
+func (e *Error) Error() string  { return e.err.Error() }
+func (e *Error) Code() int      { return -1 }
+func (e *Error) String() string { return e.Error() }
+
+func errorf(format string, args ...interface{}) *Error {
+	return &Error{fmt.Errorf(format, args...)}
+}
+
+// Hello is the RLP structure of the protocol handshake.
+type Hello struct {
+	Version    uint64
+	Name       string
+	Caps       []p2p.Cap
+	ListenPort uint64
+	ID         []byte // secp256k1 public key
+
+	// Ignore additional fields (for forward compatibility).
+	Rest []rlp.RawValue `rlp:"tail"`
+}
+
+func (h Hello) Code() int { return 0x00 }
+
+// Disconnect is the RLP structure for a disconnect message.
+type Disconnect struct {
+	Reason p2p.DiscReason
+}
+
+func (d Disconnect) Code() int { return 0x01 }
+
+type Ping struct{}
+
+func (p Ping) Code() int { return 0x02 }
+
+type Pong struct{}
+
+func (p Pong) Code() int { return 0x03 }
+
+// Status is the network packet for the status message for eth/64 and later.
+type Status eth.StatusPacket
+
+func (s Status) Code() int { return 16 }
+
+// NewBlockHashes is the network packet for the block announcements.
+type NewBlockHashes eth.NewBlockHashesPacket
+
+func (nbh NewBlockHashes) Code() int { return 17 }
+
+type Transactions eth.TransactionsPacket
+
+func (t Transactions) Code() int { return 18 }
+
+// GetBlockHeaders represents a block header query.
+type GetBlockHeaders eth.GetBlockHeadersPacket
+
+func (g GetBlockHeaders) Code() int { return 19 }
+
+type BlockHeaders eth.BlockHeadersPacket
+
+func (bh BlockHeaders) Code() int { return 20 }
+
+// GetBlockBodies represents a GetBlockBodies request
+type GetBlockBodies eth.GetBlockBodiesPacket
+
+func (gbb GetBlockBodies) Code() int { return 21 }
+
+// BlockBodies is the network packet for block content distribution.
+type BlockBodies eth.BlockBodiesPacket
+
+func (bb BlockBodies) Code() int { return 22 }
+
+// NewBlock is the network packet for the block propagation message.
+type NewBlock eth.NewBlockPacket
+
+func (nb NewBlock) Code() int { return 23 }
+
+// NewPooledTransactionHashes is the network packet for the tx hash propagation message.
+type NewPooledTransactionHashes eth.NewPooledTransactionHashesPacket
+
+func (nb NewPooledTransactionHashes) Code() int { return 24 }
+
+// Conn represents an individual connection with a peer
+type Conn struct {
+	*rlpx.Conn
+	ourKey             *ecdsa.PrivateKey
+	ethProtocolVersion uint
+	caps               []p2p.Cap
+}
+
+func (c *Conn) Read() Message {
+	code, rawData, _, err := c.Conn.Read()
+	if err != nil {
+		return 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():
+		msg = new(GetBlockHeaders)
+	case (BlockHeaders{}).Code():
+		msg = new(BlockHeaders)
+	case (GetBlockBodies{}).Code():
+		msg = new(GetBlockBodies)
+	case (BlockBodies{}).Code():
+		msg = new(BlockBodies)
+	case (NewBlock{}).Code():
+		msg = new(NewBlock)
+	case (NewBlockHashes{}).Code():
+		msg = new(NewBlockHashes)
+	case (Transactions{}).Code():
+		msg = new(Transactions)
+	case (NewPooledTransactionHashes{}).Code():
+		msg = new(NewPooledTransactionHashes)
+	default:
+		return errorf("invalid message code: %d", code)
+	}
+	// if message is devp2p, decode here
+	if err := rlp.DecodeBytes(rawData, msg); err != nil {
+		return errorf("could not rlp decode message: %v", err)
+	}
+	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 {
+		timeout := time.Now().Add(10 * time.Second)
+		c.SetReadDeadline(timeout)
+		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)
+}
+
+func (c *Conn) Write(msg Message) error {
+	// check if message is eth protocol message
+	var (
+		payload []byte
+		err     error
+	)
+	payload, err = rlp.EncodeToBytes(msg)
+	if err != nil {
+		return err
+	}
+	_, err = c.Conn.Write(uint64(msg.Code()), payload)
+	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.ethProtocolVersion == 0 {
+			t.Fatalf("unexpected eth protocol version")
+		}
+		return msg
+	default:
+		t.Fatalf("bad handshake: %#v", msg)
+		return nil
+	}
+}
+
+// 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" {
+			continue
+		}
+		if capability.Version > highestEthVersion && capability.Version <= 65 {
+			highestEthVersion = capability.Version
+		}
+	}
+	c.ethProtocolVersion = 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 msg.Head != chain.blocks[chain.Len()-1].Hash() {
+				t.Fatalf("wrong head block in status: %s", msg.Head.String())
+			}
+			if msg.TD.Cmp(chain.TD(chain.Len())) != 0 {
+				t.Fatalf("wrong TD in status: %v", msg.TD)
+			}
+			if !reflect.DeepEqual(msg.ForkID, chain.ForkID()) {
+				t.Fatalf("wrong fork ID in status: %v", msg.ForkID)
+			}
+			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.ethProtocolVersion == 0 {
+		t.Fatalf("eth protocol version must be set in Conn")
+	}
+	if status == nil {
+		// write status message to client
+		status = &Status{
+			ProtocolVersion: uint32(c.ethProtocolVersion),
+			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{})
+
+	timeout := time.Now().Add(20 * time.Second)
+	c.SetReadDeadline(timeout)
+	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:
+			if len(*msg) > 0 {
+				return nil
+			}
+			time.Sleep(100 * time.Millisecond)
+		default:
+			return fmt.Errorf("invalid message: %s", pretty.Sdump(msg))
+		}
+	}
+}
--- a/cmd/devp2p/internal/v5test/discv5tests.go
+++ b/cmd/devp2p/internal/v5test/discv5tests.go
@@ -0,0 +1,377 @@
+// Copyright 2020 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 v5test
+
+import (
+	"bytes"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/ethereum/go-ethereum/internal/utesting"
+	"github.com/ethereum/go-ethereum/p2p/discover/v5wire"
+	"github.com/ethereum/go-ethereum/p2p/enode"
+	"github.com/ethereum/go-ethereum/p2p/netutil"
+)
+
+// Suite is the discv5 test suite.
+type Suite struct {
+	Dest             *enode.Node
+	Listen1, Listen2 string // listening addresses
+}
+
+func (s *Suite) listen1(log logger) (*conn, net.PacketConn) {
+	c := newConn(s.Dest, log)
+	l := c.listen(s.Listen1)
+	return c, l
+}
+
+func (s *Suite) listen2(log logger) (*conn, net.PacketConn, net.PacketConn) {
+	c := newConn(s.Dest, log)
+	l1, l2 := c.listen(s.Listen1), c.listen(s.Listen2)
+	return c, l1, l2
+}
+
+func (s *Suite) AllTests() []utesting.Test {
+	return []utesting.Test{
+		{Name: "Ping", Fn: s.TestPing},
+		{Name: "PingLargeRequestID", Fn: s.TestPingLargeRequestID},
+		{Name: "PingMultiIP", Fn: s.TestPingMultiIP},
+		{Name: "PingHandshakeInterrupted", Fn: s.TestPingHandshakeInterrupted},
+		{Name: "TalkRequest", Fn: s.TestTalkRequest},
+		{Name: "FindnodeZeroDistance", Fn: s.TestFindnodeZeroDistance},
+		{Name: "FindnodeResults", Fn: s.TestFindnodeResults},
+	}
+}
+
+// This test sends PING and expects a PONG response.
+func (s *Suite) TestPing(t *utesting.T) {
+	conn, l1 := s.listen1(t)
+	defer conn.close()
+
+	ping := &v5wire.Ping{ReqID: conn.nextReqID()}
+	switch resp := conn.reqresp(l1, ping).(type) {
+	case *v5wire.Pong:
+		checkPong(t, resp, ping, l1)
+	default:
+		t.Fatal("expected PONG, got", resp.Name())
+	}
+}
+
+func checkPong(t *utesting.T, pong *v5wire.Pong, ping *v5wire.Ping, c net.PacketConn) {
+	if !bytes.Equal(pong.ReqID, ping.ReqID) {
+		t.Fatalf("wrong request ID %x in PONG, want %x", pong.ReqID, ping.ReqID)
+	}
+	if !pong.ToIP.Equal(laddr(c).IP) {
+		t.Fatalf("wrong destination IP %v in PONG, want %v", pong.ToIP, laddr(c).IP)
+	}
+	if int(pong.ToPort) != laddr(c).Port {
+		t.Fatalf("wrong destination port %v in PONG, want %v", pong.ToPort, laddr(c).Port)
+	}
+}
+
+// This test sends PING with a 9-byte request ID, which isn't allowed by the spec.
+// The remote node should not respond.
+func (s *Suite) TestPingLargeRequestID(t *utesting.T) {
+	conn, l1 := s.listen1(t)
+	defer conn.close()
+
+	ping := &v5wire.Ping{ReqID: make([]byte, 9)}
+	switch resp := conn.reqresp(l1, ping).(type) {
+	case *v5wire.Pong:
+		t.Errorf("PONG response with unknown request ID %x", resp.ReqID)
+	case *readError:
+		if resp.err == v5wire.ErrInvalidReqID {
+			t.Error("response with oversized request ID")
+		} else if !netutil.IsTimeout(resp.err) {
+			t.Error(resp)
+		}
+	}
+}
+
+// In this test, a session is established from one IP as usual. The session is then reused
+// on another IP, which shouldn't work. The remote node should respond with WHOAREYOU for
+// the attempt from a different IP.
+func (s *Suite) TestPingMultiIP(t *utesting.T) {
+	conn, l1, l2 := s.listen2(t)
+	defer conn.close()
+
+	// Create the session on l1.
+	ping := &v5wire.Ping{ReqID: conn.nextReqID()}
+	resp := conn.reqresp(l1, ping)
+	if resp.Kind() != v5wire.PongMsg {
+		t.Fatal("expected PONG, got", resp)
+	}
+	checkPong(t, resp.(*v5wire.Pong), ping, l1)
+
+	// Send on l2. This reuses the session because there is only one codec.
+	ping2 := &v5wire.Ping{ReqID: conn.nextReqID()}
+	conn.write(l2, ping2, nil)
+	switch resp := conn.read(l2).(type) {
+	case *v5wire.Pong:
+		t.Fatalf("remote responded to PING from %v for session on IP %v", laddr(l2).IP, laddr(l1).IP)
+	case *v5wire.Whoareyou:
+		t.Logf("got WHOAREYOU for new session as expected")
+		resp.Node = s.Dest
+		conn.write(l2, ping2, resp)
+	default:
+		t.Fatal("expected WHOAREYOU, got", resp)
+	}
+
+	// Catch the PONG on l2.
+	switch resp := conn.read(l2).(type) {
+	case *v5wire.Pong:
+		checkPong(t, resp, ping2, l2)
+	default:
+		t.Fatal("expected PONG, got", resp)
+	}
+
+	// Try on l1 again.
+	ping3 := &v5wire.Ping{ReqID: conn.nextReqID()}
+	conn.write(l1, ping3, nil)
+	switch resp := conn.read(l1).(type) {
+	case *v5wire.Pong:
+		t.Fatalf("remote responded to PING from %v for session on IP %v", laddr(l1).IP, laddr(l2).IP)
+	case *v5wire.Whoareyou:
+		t.Logf("got WHOAREYOU for new session as expected")
+	default:
+		t.Fatal("expected WHOAREYOU, got", resp)
+	}
+}
+
+// This test starts a handshake, but doesn't finish it and sends a second ordinary message
+// packet instead of a handshake message packet. The remote node should respond with
+// another WHOAREYOU challenge for the second packet.
+func (s *Suite) TestPingHandshakeInterrupted(t *utesting.T) {
+	conn, l1 := s.listen1(t)
+	defer conn.close()
+
+	// First PING triggers challenge.
+	ping := &v5wire.Ping{ReqID: conn.nextReqID()}
+	conn.write(l1, ping, nil)
+	switch resp := conn.read(l1).(type) {
+	case *v5wire.Whoareyou:
+		t.Logf("got WHOAREYOU for PING")
+	default:
+		t.Fatal("expected WHOAREYOU, got", resp)
+	}
+
+	// Send second PING.
+	ping2 := &v5wire.Ping{ReqID: conn.nextReqID()}
+	switch resp := conn.reqresp(l1, ping2).(type) {
+	case *v5wire.Pong:
+		checkPong(t, resp, ping2, l1)
+	default:
+		t.Fatal("expected WHOAREYOU, got", resp)
+	}
+}
+
+// This test sends TALKREQ and expects an empty TALKRESP response.
+func (s *Suite) TestTalkRequest(t *utesting.T) {
+	conn, l1 := s.listen1(t)
+	defer conn.close()
+
+	// Non-empty request ID.
+	id := conn.nextReqID()
+	resp := conn.reqresp(l1, &v5wire.TalkRequest{ReqID: id, Protocol: "test-protocol"})
+	switch resp := resp.(type) {
+	case *v5wire.TalkResponse:
+		if !bytes.Equal(resp.ReqID, id) {
+			t.Fatalf("wrong request ID %x in TALKRESP, want %x", resp.ReqID, id)
+		}
+		if len(resp.Message) > 0 {
+			t.Fatalf("non-empty message %x in TALKRESP", resp.Message)
+		}
+	default:
+		t.Fatal("expected TALKRESP, got", resp.Name())
+	}
+
+	// Empty request ID.
+	resp = conn.reqresp(l1, &v5wire.TalkRequest{Protocol: "test-protocol"})
+	switch resp := resp.(type) {
+	case *v5wire.TalkResponse:
+		if len(resp.ReqID) > 0 {
+			t.Fatalf("wrong request ID %x in TALKRESP, want empty byte array", resp.ReqID)
+		}
+		if len(resp.Message) > 0 {
+			t.Fatalf("non-empty message %x in TALKRESP", resp.Message)
+		}
+	default:
+		t.Fatal("expected TALKRESP, got", resp.Name())
+	}
+}
+
+// This test checks that the remote node returns itself for FINDNODE with distance zero.
+func (s *Suite) TestFindnodeZeroDistance(t *utesting.T) {
+	conn, l1 := s.listen1(t)
+	defer conn.close()
+
+	nodes, err := conn.findnode(l1, []uint{0})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(nodes) != 1 {
+		t.Fatalf("remote returned more than one node for FINDNODE [0]")
+	}
+	if nodes[0].ID() != conn.remote.ID() {
+		t.Errorf("ID of response node is %v, want %v", nodes[0].ID(), conn.remote.ID())
+	}
+}
+
+// In this test, multiple nodes ping the node under test. After waiting for them to be
+// accepted into the remote table, the test checks that they are returned by FINDNODE.
+func (s *Suite) TestFindnodeResults(t *utesting.T) {
+	// Create bystanders.
+	nodes := make([]*bystander, 5)
+	added := make(chan enode.ID, len(nodes))
+	for i := range nodes {
+		nodes[i] = newBystander(t, s, added)
+		defer nodes[i].close()
+	}
+
+	// Get them added to the remote table.
+	timeout := 60 * time.Second
+	timeoutCh := time.After(timeout)
+	for count := 0; count < len(nodes); {
+		select {
+		case id := <-added:
+			t.Logf("bystander node %v added to remote table", id)
+			count++
+		case <-timeoutCh:
+			t.Errorf("remote added %d bystander nodes in %v, need %d to continue", count, timeout, len(nodes))
+			t.Logf("this can happen if the node has a non-empty table from previous runs")
+			return
+		}
+	}
+	t.Logf("all %d bystander nodes were added", len(nodes))
+
+	// Collect our nodes by distance.
+	var dists []uint
+	expect := make(map[enode.ID]*enode.Node)
+	for _, bn := range nodes {
+		n := bn.conn.localNode.Node()
+		expect[n.ID()] = n
+		d := uint(enode.LogDist(n.ID(), s.Dest.ID()))
+		if !containsUint(dists, d) {
+			dists = append(dists, d)
+		}
+	}
+
+	// Send FINDNODE for all distances.
+	conn, l1 := s.listen1(t)
+	defer conn.close()
+	foundNodes, err := conn.findnode(l1, dists)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("remote returned %d nodes for distance list %v", len(foundNodes), dists)
+	for _, n := range foundNodes {
+		delete(expect, n.ID())
+	}
+	if len(expect) > 0 {
+		t.Errorf("missing %d nodes in FINDNODE result", len(expect))
+		t.Logf("this can happen if the test is run multiple times in quick succession")
+		t.Logf("and the remote node hasn't removed dead nodes from previous runs yet")
+	} else {
+		t.Logf("all %d expected nodes were returned", len(nodes))
+	}
+}
+
+// A bystander is a node whose only purpose is filling a spot in the remote table.
+type bystander struct {
+	dest *enode.Node
+	conn *conn
+	l    net.PacketConn
+
+	addedCh chan enode.ID
+	done    sync.WaitGroup
+}
+
+func newBystander(t *utesting.T, s *Suite, added chan enode.ID) *bystander {
+	conn, l := s.listen1(t)
+	conn.setEndpoint(l) // bystander nodes need IP/port to get pinged
+	bn := &bystander{
+		conn:    conn,
+		l:       l,
+		dest:    s.Dest,
+		addedCh: added,
+	}
+	bn.done.Add(1)
+	go bn.loop()
+	return bn
+}
+
+// id returns the node ID of the bystander.
+func (bn *bystander) id() enode.ID {
+	return bn.conn.localNode.ID()
+}
+
+// close shuts down loop.
+func (bn *bystander) close() {
+	bn.conn.close()
+	bn.done.Wait()
+}
+
+// loop answers packets from the remote node until quit.
+func (bn *bystander) loop() {
+	defer bn.done.Done()
+
+	var (
+		lastPing time.Time
+		wasAdded bool
+	)
+	for {
+		// Ping the remote node.
+		if !wasAdded && time.Since(lastPing) > 10*time.Second {
+			bn.conn.reqresp(bn.l, &v5wire.Ping{
+				ReqID:  bn.conn.nextReqID(),
+				ENRSeq: bn.dest.Seq(),
+			})
+			lastPing = time.Now()
+		}
+		// Answer packets.
+		switch p := bn.conn.read(bn.l).(type) {
+		case *v5wire.Ping:
+			bn.conn.write(bn.l, &v5wire.Pong{
+				ReqID:  p.ReqID,
+				ENRSeq: bn.conn.localNode.Seq(),
+				ToIP:   bn.dest.IP(),
+				ToPort: uint16(bn.dest.UDP()),
+			}, nil)
+			wasAdded = true
+			bn.notifyAdded()
+		case *v5wire.Findnode:
+			bn.conn.write(bn.l, &v5wire.Nodes{ReqID: p.ReqID, Total: 1}, nil)
+			wasAdded = true
+			bn.notifyAdded()
+		case *v5wire.TalkRequest:
+			bn.conn.write(bn.l, &v5wire.TalkResponse{ReqID: p.ReqID}, nil)
+		case *readError:
+			if !netutil.IsTemporaryError(p.err) {
+				bn.conn.logf("shutting down: %v", p.err)
+				return
+			}
+		}
+	}
+}
+
+func (bn *bystander) notifyAdded() {
+	if bn.addedCh != nil {
+		bn.addedCh <- bn.id()
+		bn.addedCh = nil
+	}
+}
--- a/cmd/devp2p/internal/v5test/framework.go
+++ b/cmd/devp2p/internal/v5test/framework.go
@@ -0,0 +1,263 @@
+// Copyright 2020 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 v5test
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"encoding/binary"
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common/mclock"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/p2p/discover/v5wire"
+	"github.com/ethereum/go-ethereum/p2p/enode"
+	"github.com/ethereum/go-ethereum/p2p/enr"
+)
+
+// readError represents an error during packet reading.
+// This exists to facilitate type-switching on the result of conn.read.
+type readError struct {
+	err error
+}
+
+func (p *readError) Kind() byte          { return 99 }
+func (p *readError) Name() string        { return fmt.Sprintf("error: %v", p.err) }
+func (p *readError) Error() string       { return p.err.Error() }
+func (p *readError) Unwrap() error       { return p.err }
+func (p *readError) RequestID() []byte   { return nil }
+func (p *readError) SetRequestID([]byte) {}
+
+// readErrorf creates a readError with the given text.
+func readErrorf(format string, args ...interface{}) *readError {
+	return &readError{fmt.Errorf(format, args...)}
+}
+
+// This is the response timeout used in tests.
+const waitTime = 300 * time.Millisecond
+
+// conn is a connection to the node under test.
+type conn struct {
+	localNode  *enode.LocalNode
+	localKey   *ecdsa.PrivateKey
+	remote     *enode.Node
+	remoteAddr *net.UDPAddr
+	listeners  []net.PacketConn
+
+	log           logger
+	codec         *v5wire.Codec
+	lastRequest   v5wire.Packet
+	lastChallenge *v5wire.Whoareyou
+	idCounter     uint32
+}
+
+type logger interface {
+	Logf(string, ...interface{})
+}
+
+// newConn sets up a connection to the given node.
+func newConn(dest *enode.Node, log logger) *conn {
+	key, err := crypto.GenerateKey()
+	if err != nil {
+		panic(err)
+	}
+	db, err := enode.OpenDB("")
+	if err != nil {
+		panic(err)
+	}
+	ln := enode.NewLocalNode(db, key)
+
+	return &conn{
+		localKey:   key,
+		localNode:  ln,
+		remote:     dest,
+		remoteAddr: &net.UDPAddr{IP: dest.IP(), Port: dest.UDP()},
+		codec:      v5wire.NewCodec(ln, key, mclock.System{}),
+		log:        log,
+	}
+}
+
+func (tc *conn) setEndpoint(c net.PacketConn) {
+	tc.localNode.SetStaticIP(laddr(c).IP)
+	tc.localNode.SetFallbackUDP(laddr(c).Port)
+}
+
+func (tc *conn) listen(ip string) net.PacketConn {
+	l, err := net.ListenPacket("udp", fmt.Sprintf("%v:0", ip))
+	if err != nil {
+		panic(err)
+	}
+	tc.listeners = append(tc.listeners, l)
+	return l
+}
+
+// close shuts down all listeners and the local node.
+func (tc *conn) close() {
+	for _, l := range tc.listeners {
+		l.Close()
+	}
+	tc.localNode.Database().Close()
+}
+
+// nextReqID creates a request id.
+func (tc *conn) nextReqID() []byte {
+	id := make([]byte, 4)
+	tc.idCounter++
+	binary.BigEndian.PutUint32(id, tc.idCounter)
+	return id
+}
+
+// reqresp performs a request/response interaction on the given connection.
+// The request is retried if a handshake is requested.
+func (tc *conn) reqresp(c net.PacketConn, req v5wire.Packet) v5wire.Packet {
+	reqnonce := tc.write(c, req, nil)
+	switch resp := tc.read(c).(type) {
+	case *v5wire.Whoareyou:
+		if resp.Nonce != reqnonce {
+			return readErrorf("wrong nonce %x in WHOAREYOU (want %x)", resp.Nonce[:], reqnonce[:])
+		}
+		resp.Node = tc.remote
+		tc.write(c, req, resp)
+		return tc.read(c)
+	default:
+		return resp
+	}
+}
+
+// findnode sends a FINDNODE request and waits for its responses.
+func (tc *conn) findnode(c net.PacketConn, dists []uint) ([]*enode.Node, error) {
+	var (
+		findnode = &v5wire.Findnode{ReqID: tc.nextReqID(), Distances: dists}
+		reqnonce = tc.write(c, findnode, nil)
+		first    = true
+		total    uint8
+		results  []*enode.Node
+	)
+	for n := 1; n > 0; {
+		switch resp := tc.read(c).(type) {
+		case *v5wire.Whoareyou:
+			// Handle handshake.
+			if resp.Nonce == reqnonce {
+				resp.Node = tc.remote
+				tc.write(c, findnode, resp)
+			} else {
+				return nil, fmt.Errorf("unexpected WHOAREYOU (nonce %x), waiting for NODES", resp.Nonce[:])
+			}
+		case *v5wire.Ping:
+			// Handle ping from remote.
+			tc.write(c, &v5wire.Pong{
+				ReqID:  resp.ReqID,
+				ENRSeq: tc.localNode.Seq(),
+			}, nil)
+		case *v5wire.Nodes:
+			// Got NODES! Check request ID.
+			if !bytes.Equal(resp.ReqID, findnode.ReqID) {
+				return nil, fmt.Errorf("NODES response has wrong request id %x", resp.ReqID)
+			}
+			// Check total count. It should be greater than one
+			// and needs to be the same across all responses.
+			if first {
+				if resp.Total == 0 || resp.Total > 6 {
+					return nil, fmt.Errorf("invalid NODES response 'total' %d (not in (0,7))", resp.Total)
+				}
+				total = resp.Total
+				n = int(total) - 1
+				first = false
+			} else {
+				n--
+				if resp.Total != total {
+					return nil, fmt.Errorf("invalid NODES response 'total' %d (!= %d)", resp.Total, total)
+				}
+			}
+			// Check nodes.
+			nodes, err := checkRecords(resp.Nodes)
+			if err != nil {
+				return nil, fmt.Errorf("invalid node in NODES response: %v", err)
+			}
+			results = append(results, nodes...)
+		default:
+			return nil, fmt.Errorf("expected NODES, got %v", resp)
+		}
+	}
+	return results, nil
+}
+
+// write sends a packet on the given connection.
+func (tc *conn) write(c net.PacketConn, p v5wire.Packet, challenge *v5wire.Whoareyou) v5wire.Nonce {
+	packet, nonce, err := tc.codec.Encode(tc.remote.ID(), tc.remoteAddr.String(), p, challenge)
+	if err != nil {
+		panic(fmt.Errorf("can't encode %v packet: %v", p.Name(), err))
+	}
+	if _, err := c.WriteTo(packet, tc.remoteAddr); err != nil {
+		tc.logf("Can't send %s: %v", p.Name(), err)
+	} else {
+		tc.logf(">> %s", p.Name())
+	}
+	return nonce
+}
+
+// read waits for an incoming packet on the given connection.
+func (tc *conn) read(c net.PacketConn) v5wire.Packet {
+	buf := make([]byte, 1280)
+	if err := c.SetReadDeadline(time.Now().Add(waitTime)); err != nil {
+		return &readError{err}
+	}
+	n, fromAddr, err := c.ReadFrom(buf)
+	if err != nil {
+		return &readError{err}
+	}
+	_, _, p, err := tc.codec.Decode(buf[:n], fromAddr.String())
+	if err != nil {
+		return &readError{err}
+	}
+	tc.logf("<< %s", p.Name())
+	return p
+}
+
+// logf prints to the test log.
+func (tc *conn) logf(format string, args ...interface{}) {
+	if tc.log != nil {
+		tc.log.Logf("(%s) %s", tc.localNode.ID().TerminalString(), fmt.Sprintf(format, args...))
+	}
+}
+
+func laddr(c net.PacketConn) *net.UDPAddr {
+	return c.LocalAddr().(*net.UDPAddr)
+}
+
+func checkRecords(records []*enr.Record) ([]*enode.Node, error) {
+	nodes := make([]*enode.Node, len(records))
+	for i := range records {
+		n, err := enode.New(enode.ValidSchemes, records[i])
+		if err != nil {
+			return nil, err
+		}
+		nodes[i] = n
+	}
+	return nodes, nil
+}
+
+func containsUint(ints []uint, x uint) bool {
+	for i := range ints {
+		if ints[i] == x {
+			return true
+		}
+	}
+	return false
+}
--- a/cmd/devp2p/main.go
+++ b/cmd/devp2p/main.go
@@ -63,6 +63,7 @@ func init() {
 		discv5Command,
 		dnsCommand,
 		nodesetCommand,
+		rlpxCommand,
 	}
 }

@@ -80,7 +81,7 @@ func commandHasFlag(ctx *cli.Context, flag cli.Flag) bool {

 // getNodeArg handles the common case of a single node descriptor argument.
 func getNodeArg(ctx *cli.Context) *enode.Node {
-	if ctx.NArg() != 1 {
+	if ctx.NArg() < 1 {
 		exit("missing node as command-line argument")
 	}
 	n, err := parseNode(ctx.Args()[0])
--- a/cmd/devp2p/nodesetcmd.go
+++ b/cmd/devp2p/nodesetcmd.go
@@ -95,6 +95,7 @@ var filterFlags = map[string]nodeFilterC{
 	"-min-age":     {1, minAgeFilter},
 	"-eth-network": {1, ethFilter},
 	"-les-server":  {0, lesFilter},
+	"-snap":        {0, snapFilter},
 }

 func parseFilters(args []string) ([]nodeFilter, error) {
@@ -104,15 +105,15 @@ func parseFilters(args []string) ([]nodeFilter, error) {
 		if !ok {
 			return nil, fmt.Errorf("invalid filter %q", args[0])
 		}
-		if len(args) < fc.narg {
-			return nil, fmt.Errorf("filter %q wants %d arguments, have %d", args[0], fc.narg, len(args))
+		if len(args)-1 < fc.narg {
+			return nil, fmt.Errorf("filter %q wants %d arguments, have %d", args[0], fc.narg, len(args)-1)
 		}
-		filter, err := fc.fn(args[1:])
+		filter, err := fc.fn(args[1 : 1+fc.narg])
 		if err != nil {
 			return nil, fmt.Errorf("%s: %v", args[0], err)
 		}
 		filters = append(filters, filter)
-		args = args[fc.narg+1:]
+		args = args[1+fc.narg:]
 	}
 	return filters, nil
 }
@@ -191,3 +192,13 @@ func lesFilter(args []string) (nodeFilter, error) {
 	}
 	return f, nil
 }
+
+func snapFilter(args []string) (nodeFilter, error) {
+	f := func(n nodeJSON) bool {
+		var snap struct {
+			_ []rlp.RawValue `rlp:"tail"`
+		}
+		return n.N.Load(enr.WithEntry("snap", &snap)) == nil
+	}
+	return f, nil
+}
--- a/cmd/devp2p/rlpxcmd.go
+++ b/cmd/devp2p/rlpxcmd.go
@@ -0,0 +1,102 @@
+// Copyright 2020 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 main
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/ethereum/go-ethereum/cmd/devp2p/internal/ethtest"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/p2p/rlpx"
+	"github.com/ethereum/go-ethereum/rlp"
+	"gopkg.in/urfave/cli.v1"
+)
+
+var (
+	rlpxCommand = cli.Command{
+		Name:  "rlpx",
+		Usage: "RLPx Commands",
+		Subcommands: []cli.Command{
+			rlpxPingCommand,
+			rlpxEthTestCommand,
+		},
+	}
+	rlpxPingCommand = cli.Command{
+		Name:   "ping",
+		Usage:  "ping <node>",
+		Action: rlpxPing,
+	}
+	rlpxEthTestCommand = cli.Command{
+		Name:      "eth-test",
+		Usage:     "Runs tests against a node",
+		ArgsUsage: "<node> <chain.rlp> <genesis.json>",
+		Action:    rlpxEthTest,
+		Flags: []cli.Flag{
+			testPatternFlag,
+			testTAPFlag,
+		},
+	}
+)
+
+func rlpxPing(ctx *cli.Context) error {
+	n := getNodeArg(ctx)
+	fd, err := net.Dial("tcp", fmt.Sprintf("%v:%d", n.IP(), n.TCP()))
+	if err != nil {
+		return err
+	}
+	conn := rlpx.NewConn(fd, n.Pubkey())
+	ourKey, _ := crypto.GenerateKey()
+	_, err = conn.Handshake(ourKey)
+	if err != nil {
+		return err
+	}
+	code, data, _, err := conn.Read()
+	if err != nil {
+		return err
+	}
+	switch code {
+	case 0:
+		var h ethtest.Hello
+		if err := rlp.DecodeBytes(data, &h); err != nil {
+			return fmt.Errorf("invalid handshake: %v", err)
+		}
+		fmt.Printf("%+v\n", h)
+	case 1:
+		var msg []p2p.DiscReason
+		if rlp.DecodeBytes(data, &msg); len(msg) == 0 {
+			return fmt.Errorf("invalid disconnect message")
+		}
+		return fmt.Errorf("received disconnect message: %v", msg[0])
+	default:
+		return fmt.Errorf("invalid message code %d, expected handshake (code zero)", code)
+	}
+	return nil
+}
+
+// rlpxEthTest runs the eth protocol test suite.
+func rlpxEthTest(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.EthTests())
+}
--- a/cmd/devp2p/runtest.go
+++ b/cmd/devp2p/runtest.go
@@ -0,0 +1,69 @@
+// Copyright 2020 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 main
+
+import (
+	"os"
+
+	"github.com/ethereum/go-ethereum/cmd/devp2p/internal/v4test"
+	"github.com/ethereum/go-ethereum/internal/utesting"
+	"github.com/ethereum/go-ethereum/log"
+	"gopkg.in/urfave/cli.v1"
+)
+
+var (
+	testPatternFlag = cli.StringFlag{
+		Name:  "run",
+		Usage: "Pattern of test suite(s) to run",
+	}
+	testTAPFlag = cli.BoolFlag{
+		Name:  "tap",
+		Usage: "Output TAP",
+	}
+	// These two are specific to the discovery tests.
+	testListen1Flag = cli.StringFlag{
+		Name:  "listen1",
+		Usage: "IP address of the first tester",
+		Value: v4test.Listen1,
+	}
+	testListen2Flag = cli.StringFlag{
+		Name:  "listen2",
+		Usage: "IP address of the second tester",
+		Value: v4test.Listen2,
+	}
+)
+
+func runTests(ctx *cli.Context, tests []utesting.Test) error {
+	// Filter test cases.
+	if ctx.IsSet(testPatternFlag.Name) {
+		tests = utesting.MatchTests(tests, ctx.String(testPatternFlag.Name))
+	}
+	// Disable logging unless explicitly enabled.
+	if !ctx.GlobalIsSet("verbosity") && !ctx.GlobalIsSet("vmodule") {
+		log.Root().SetHandler(log.DiscardHandler())
+	}
+	// Run the tests.
+	var run = utesting.RunTests
+	if ctx.Bool(testTAPFlag.Name) {
+		run = utesting.RunTAP
+	}
+	results := run(tests, os.Stdout)
+	if utesting.CountFailures(results) > 0 {
+		os.Exit(1)
+	}
+	return nil
+}
--- a/cmd/ethkey/generate.go
+++ b/cmd/ethkey/generate.go
@@ -26,7 +26,7 @@ import (
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/pborman/uuid"
+	"github.com/google/uuid"
 	"gopkg.in/urfave/cli.v1"
 )

@@ -86,9 +86,12 @@ If you want to encrypt an existing private key, it can be specified by setting
 		}

 		// Create the keyfile object with a random UUID.
-		id := uuid.NewRandom()
+		UUID, err := uuid.NewRandom()
+		if err != nil {
+			utils.Fatalf("Failed to generate random uuid: %v", err)
+		}
 		key := &keystore.Key{
-			Id:         id,
+			Id:         UUID,
 			Address:    crypto.PubkeyToAddress(privateKey.PublicKey),
 			PrivateKey: privateKey,
 		}
--- a/cmd/evm/README.md
+++ b/cmd/evm/README.md
@@ -30,7 +30,7 @@ Command line params that has to be supported are
   --trace.nomemory                   Disable full memory dump in traces
   --trace.nostack                    Disable stack output in traces
   --trace.noreturndata               Disable return data output in traces
-   --output.basedir value             Specifies where output files are placed. Will be created if it does not exist. (default: ".")
+   --output.basedir value             Specifies where output files are placed. Will be created if it does not exist.
   --output.alloc alloc               Determines where to put the alloc of the post-state.
                                      `stdout` - into the stdout output
                                      `stderr` - into the stderr output
@@ -237,10 +237,10 @@ Example where blockhashes are provided:
 cat trace-0-0x72fadbef39cd251a437eea619cfeda752271a5faaaa2147df012e112159ffb81.jsonl | grep BLOCKHASH -C2
 ```
 ```
-{"pc":0,"op":96,"gas":"0x5f58ef8","gasCost":"0x3","memory":"0x","memSize":0,"stack":[],"returnStack":[],"returnData":null,"depth":1,"refund":0,"opName":"PUSH1","error":""}
-{"pc":2,"op":64,"gas":"0x5f58ef5","gasCost":"0x14","memory":"0x","memSize":0,"stack":["0x1"],"returnStack":[],"returnData":null,"depth":1,"refund":0,"opName":"BLOCKHASH","error":""}
-{"pc":3,"op":0,"gas":"0x5f58ee1","gasCost":"0x0","memory":"0x","memSize":0,"stack":["0xdac58aa524e50956d0c0bae7f3f8bb9d35381365d07804dd5b48a5a297c06af4"],"returnStack":[],"returnData":null,"depth":1,"refund":0,"opName":"STOP","error":""}
-{"output":"","gasUsed":"0x17","time":112885}
+{"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}
 ```

 In this example, the caller has not provided the required blockhash:
@@ -256,9 +256,9 @@ Error code: 4
 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 [08-03|15:25:15.168] rejected tx                              index=1 hash="0557ba…18d673" from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low"
-INFO [08-03|15:25:15.169] rejected tx                              index=0 hash="0557ba…18d673" from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low"
-INFO [08-03|15:25:15.169] rejected tx                              index=1 hash="0557ba…18d673" from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low"
+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"

 ```
 What happened here, is that we first applied two identical transactions, so the second one was rejected. 
@@ -267,4 +267,3 @@ 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.
-
--- a/cmd/evm/compiler.go
+++ b/cmd/evm/compiler.go
@@ -23,7 +23,7 @@ import (

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

-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )

 var compileCommand = cli.Command{
--- a/cmd/evm/disasm.go
+++ b/cmd/evm/disasm.go
@@ -23,7 +23,7 @@ import (
 	"strings"

 	"github.com/ethereum/go-ethereum/core/asm"
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )

 var disasmCommand = cli.Command{
--- a/cmd/evm/internal/t8ntool/execution.go
+++ b/cmd/evm/internal/t8ntool/execution.go
@@ -110,7 +110,7 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 		txIndex     = 0
 	)
 	gaspool.AddGas(pre.Env.GasLimit)
-	vmContext := vm.Context{
+	vmContext := vm.BlockContext{
 		CanTransfer: core.CanTransfer,
 		Transfer:    core.Transfer,
 		Coinbase:    pre.Env.Coinbase,
@@ -119,7 +119,6 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 		Difficulty:  pre.Env.Difficulty,
 		GasLimit:    pre.Env.GasLimit,
 		GetHash:     getHash,
-		// GasPrice and Origin needs to be set per transaction
 	}
 	// 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.
@@ -143,11 +142,10 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 		vmConfig.Tracer = tracer
 		vmConfig.Debug = (tracer != nil)
 		statedb.Prepare(tx.Hash(), blockHash, txIndex)
-		vmContext.GasPrice = msg.GasPrice()
-		vmContext.Origin = msg.From()
-
-		evm := vm.NewEVM(vmContext, statedb, chainConfig, vmConfig)
+		txContext := core.NewEVMTxContext(msg)
 		snapshot := statedb.Snapshot()
+		evm := vm.NewEVM(vmContext, txContext, statedb, chainConfig, vmConfig)
+
 		// (ret []byte, usedGas uint64, failed bool, err error)
 		msgResult, err := core.ApplyMessage(evm, msg, gaspool)
 		if err != nil {
@@ -161,7 +159,8 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 			return nil, nil, NewError(ErrorMissingBlockhash, hashError)
 		}
 		gasUsed += msgResult.UsedGas
-		// Create a new receipt for the transaction, storing the intermediate root and gas used by the tx
+
+		// Receipt:
 		{
 			var root []byte
 			if chainConfig.IsByzantium(vmContext.BlockNumber) {
@@ -170,22 +169,32 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 				root = statedb.IntermediateRoot(chainConfig.IsEIP158(vmContext.BlockNumber)).Bytes()
 			}

-			receipt := types.NewReceipt(root, msgResult.Failed(), gasUsed)
+			// Create a new receipt for the transaction, storing the intermediate root and
+			// gas used by the tx.
+			receipt := &types.Receipt{Type: tx.Type(), PostState: root, CumulativeGasUsed: gasUsed}
+			if msgResult.Failed() {
+				receipt.Status = types.ReceiptStatusFailed
+			} else {
+				receipt.Status = types.ReceiptStatusSuccessful
+			}
 			receipt.TxHash = tx.Hash()
 			receipt.GasUsed = msgResult.UsedGas
-			// if the transaction created a contract, store the creation address in the receipt.
+
+			// If the transaction created a contract, store the creation address in the receipt.
 			if msg.To() == nil {
-				receipt.ContractAddress = crypto.CreateAddress(evm.Context.Origin, tx.Nonce())
+				receipt.ContractAddress = crypto.CreateAddress(evm.TxContext.Origin, tx.Nonce())
 			}
-			// Set the receipt logs and create a bloom for filtering
+
+			// Set the receipt logs and create the bloom filter.
 			receipt.Logs = statedb.GetLogs(tx.Hash())
 			receipt.Bloom = types.CreateBloom(types.Receipts{receipt})
-			// These three are non-consensus fields
+			// These three are non-consensus fields:
 			//receipt.BlockHash
-			//receipt.BlockNumber =
+			//receipt.BlockNumber
 			receipt.TransactionIndex = uint(txIndex)
 			receipts = append(receipts, receipt)
 		}
+
 		txIndex++
 	}
 	statedb.IntermediateRoot(chainConfig.IsEIP158(vmContext.BlockNumber))
@@ -221,8 +230,8 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 	}
 	execRs := &ExecutionResult{
 		StateRoot:   root,
-		TxRoot:      types.DeriveSha(includedTxs, new(trie.Trie)),
-		ReceiptRoot: types.DeriveSha(receipts, new(trie.Trie)),
+		TxRoot:      types.DeriveSha(includedTxs, trie.NewStackTrie(nil)),
+		ReceiptRoot: types.DeriveSha(receipts, trie.NewStackTrie(nil)),
 		Bloom:       types.CreateBloom(receipts),
 		LogsHash:    rlpHash(statedb.Logs()),
 		Receipts:    receipts,
--- a/cmd/evm/internal/t8ntool/flags.go
+++ b/cmd/evm/internal/t8ntool/flags.go
@@ -47,6 +47,11 @@ var (
 		Usage: "Specifies where output files are placed. Will be created if it does not exist.",
 		Value: "",
 	}
+	OutputBodyFlag = cli.StringFlag{
+		Name:  "output.body",
+		Usage: "If set, the RLP of the transactions (block body) will be written to this file.",
+		Value: "",
+	}
 	OutputAllocFlag = cli.StringFlag{
 		Name: "output.alloc",
 		Usage: "Determines where to put the `alloc` of the post-state.\n" +
--- a/cmd/evm/internal/t8ntool/transition.go
+++ b/cmd/evm/internal/t8ntool/transition.go
@@ -17,6 +17,7 @@
 package t8ntool

 import (
+	"crypto/ecdsa"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -25,12 +26,15 @@ import (
 	"path"

 	"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/state"
 	"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/log"
 	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/tests"
 	"gopkg.in/urfave/cli.v1"
 )
@@ -64,9 +68,9 @@ func (n *NumberedError) Code() int {
 }

 type input struct {
-	Alloc core.GenesisAlloc  `json:"alloc,omitempty"`
-	Env   *stEnv             `json:"env,omitempty"`
-	Txs   types.Transactions `json:"txs,omitempty"`
+	Alloc core.GenesisAlloc `json:"alloc,omitempty"`
+	Env   *stEnv            `json:"env,omitempty"`
+	Txs   []*txWithKey      `json:"txs,omitempty"`
 }

 func Main(ctx *cli.Context) error {
@@ -135,7 +139,7 @@ func Main(ctx *cli.Context) error {
 		txStr     = ctx.String(InputTxsFlag.Name)
 		inputData = &input{}
 	)
-
+	// Figure out the prestate alloc
 	if allocStr == stdinSelector || envStr == stdinSelector || txStr == stdinSelector {
 		decoder := json.NewDecoder(os.Stdin)
 		decoder.Decode(inputData)
@@ -151,7 +155,9 @@ func Main(ctx *cli.Context) error {
 			return NewError(ErrorJson, fmt.Errorf("Failed unmarshaling alloc-file: %v", err))
 		}
 	}
+	prestate.Pre = inputData.Alloc

+	// Set the block environment
 	if envStr != stdinSelector {
 		inFile, err := os.Open(envStr)
 		if err != nil {
@@ -165,26 +171,8 @@ func Main(ctx *cli.Context) error {
 		}
 		inputData.Env = &env
 	}
-
-	if txStr != stdinSelector {
-		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)
-		var txs types.Transactions
-		if err := decoder.Decode(&txs); err != nil {
-			return NewError(ErrorJson, fmt.Errorf("Failed unmarshaling txs-file: %v", err))
-		}
-		inputData.Txs = txs
-	}
-
-	prestate.Pre = inputData.Alloc
 	prestate.Env = *inputData.Env
-	txs = inputData.Txs

-	// Iterate over all the tests, run them and aggregate the results
 	vmConfig := vm.Config{
 		Tracer: tracer,
 		Debug:  (tracer != nil),
@@ -200,19 +188,107 @@ func Main(ctx *cli.Context) error {
 	// Set the chain id
 	chainConfig.ChainID = big.NewInt(ctx.Int64(ChainIDFlag.Name))

+	var txsWithKeys []*txWithKey
+	if txStr != stdinSelector {
+		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 err := decoder.Decode(&txsWithKeys); err != nil {
+			return NewError(ErrorJson, fmt.Errorf("Failed unmarshaling txs-file: %v", err))
+		}
+	} else {
+		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))
+	}
+
+	// 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)
 	if err != nil {
 		return err
 	}
+	body, _ := rlp.EncodeToBytes(txs)
 	// Dump the excution result
-	//postAlloc := state.DumpGenesisFormat(false, false, false)
 	collector := make(Alloc)
 	state.DumpToCollector(collector, false, false, false, nil, -1)
-	return dispatchOutput(ctx, baseDir, result, collector)
+	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
+}
+
+func (t *txWithKey) UnmarshalJSON(input []byte) error {
+	// Read the secretKey, if present
+	type sKey struct {
+		Key *common.Hash `json:"secretKey"`
+	}
+	var key sKey
+	if err := json.Unmarshal(input, &key); err != nil {
+		return err
+	}
+	if key.Key != nil {
+		k := key.Key.Hex()[2:]
+		if ecdsaKey, err := crypto.HexToECDSA(k); err != nil {
+			return err
+		} else {
+			t.key = ecdsaKey
+		}
+	}
+	// Now, read the transaction itself
+	var tx types.Transaction
+	if err := json.Unmarshal(input, &tx); err != nil {
+		return err
+	}
+	t.tx = &tx
+	return nil
+}
+
+// signUnsignedTransactions converts the input txs to canonical transactions.
+//
+// The transactions can have two forms, either
+//   1. unsigned or
+//   2. signed
+// For (1), r, s, v, need so be zero, and the `secretKey` needs to be set.
+// If so, we sign it here and now, with the given `secretKey`
+// If the condition above is not met, then it's considered a signed transaction.
+//
+// To manage this, we read the transactions twice, first trying to read the secretKeys,
+// and secondly to read them with the standard tx json format
+func signUnsignedTransactions(txs []*txWithKey, signer types.Signer) (types.Transactions, error) {
+	var signedTxs []*types.Transaction
+	for i, txWithKey := range txs {
+		tx := txWithKey.tx
+		key := txWithKey.key
+		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)
+			if err != nil {
+				return nil, NewError(ErrorJson, fmt.Errorf("Tx %d: failed to sign tx: %v", i, err))
+			}
+			signedTxs = append(signedTxs, signed)
+		} else {
+			// Already signed
+			signedTxs = append(signedTxs, tx)
+		}
+	}
+	return signedTxs, nil
+}
+
 type Alloc map[common.Address]core.GenesisAccount

 func (g Alloc) OnRoot(common.Hash) {}
@@ -241,15 +317,17 @@ func saveFile(baseDir, filename string, data interface{}) error {
 	if err != nil {
 		return NewError(ErrorJson, fmt.Errorf("failed marshalling output: %v", err))
 	}
-	if err = ioutil.WriteFile(path.Join(baseDir, filename), b, 0644); err != nil {
+	location := path.Join(baseDir, filename)
+	if err = ioutil.WriteFile(location, b, 0644); err != nil {
 		return NewError(ErrorIO, fmt.Errorf("failed writing output: %v", err))
 	}
+	log.Info("Wrote file", "file", location)
 	return nil
 }

 // dispatchOutput writes the output data to either stderr or stdout, or to the specified
 // files
-func dispatchOutput(ctx *cli.Context, baseDir string, result *ExecutionResult, alloc Alloc) error {
+func dispatchOutput(ctx *cli.Context, baseDir string, result *ExecutionResult, alloc Alloc, body hexutil.Bytes) error {
 	stdOutObject := make(map[string]interface{})
 	stdErrObject := make(map[string]interface{})
 	dispatch := func(baseDir, fName, name string, obj interface{}) error {
@@ -258,6 +336,8 @@ func dispatchOutput(ctx *cli.Context, baseDir string, result *ExecutionResult, a
 			stdOutObject[name] = obj
 		case "stderr":
 			stdErrObject[name] = obj
+		case "":
+			// don't save
 		default: // save to file
 			if err := saveFile(baseDir, fName, obj); err != nil {
 				return err
@@ -271,6 +351,9 @@ func dispatchOutput(ctx *cli.Context, baseDir string, result *ExecutionResult, a
 	if err := dispatch(baseDir, ctx.String(OutputResultFlag.Name), "result", result); err != nil {
 		return err
 	}
+	if err := dispatch(baseDir, ctx.String(OutputBodyFlag.Name), "body", body); err != nil {
+		return err
+	}
 	if len(stdOutObject) > 0 {
 		b, err := json.MarshalIndent(stdOutObject, "", " ")
 		if err != nil {
--- a/cmd/evm/main.go
+++ b/cmd/evm/main.go
@@ -149,6 +149,7 @@ var stateTransitionCommand = cli.Command{
 		t8ntool.OutputBasedir,
 		t8ntool.OutputAllocFlag,
 		t8ntool.OutputResultFlag,
+		t8ntool.OutputBodyFlag,
 		t8ntool.InputAllocFlag,
 		t8ntool.InputEnvFlag,
 		t8ntool.InputTxsFlag,
--- a/cmd/evm/runner.go
+++ b/cmd/evm/runner.go
@@ -38,7 +38,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/vm/runtime"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )

 var runCommand = cli.Command{
--- a/cmd/evm/staterunner.go
+++ b/cmd/evm/staterunner.go
@@ -28,7 +28,7 @@ import (
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/tests"

-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )

 var stateTestCommand = cli.Command{
--- a/cmd/evm/testdata/8/alloc.json
+++ b/cmd/evm/testdata/8/alloc.json
@@ -0,0 +1,11 @@
+{
+  "0x000000000000000000000000000000000000aaaa": {
+    "balance": "0x03",
+    "code": "0x5854505854",
+    "nonce": "0x1"
+  },
+  "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+    "balance": "0x100000",
+    "nonce": "0x00"
+  }
+}
--- a/cmd/evm/testdata/8/env.json
+++ b/cmd/evm/testdata/8/env.json
@@ -0,0 +1,7 @@
+{
+  "currentCoinbase": "0x2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+  "currentDifficulty": "0x20000",
+  "currentGasLimit": "0x1000000000",
+  "currentNumber": "0x1000000",
+  "currentTimestamp": "0x04"
+}
--- a/cmd/evm/testdata/8/readme.md
+++ b/cmd/evm/testdata/8/readme.md
@@ -0,0 +1,63 @@
+## EIP-2930 testing
+
+This test contains testcases for EIP-2930, which uses transactions with access lists. 
+
+### Prestate
+
+The alloc portion contains one contract (`0x000000000000000000000000000000000000aaaa`), containing the 
+following code: `0x5854505854`: `PC ;SLOAD; POP; PC; SLOAD`.
+
+Essentialy, this contract does `SLOAD(0)` and `SLOAD(3)`.
+
+The alloc also contains some funds on `0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b`. 
+
+## Transactions
+
+There are three transactions, each invokes the contract above. 
+
+1. ACL-transaction, which contains some non-used slots
+2. Regular transaction
+3. ACL-transaction, which contains the slots `1` and `3` in `0x000000000000000000000000000000000000aaaa`
+
+## Execution 
+
+Running it yields: 
+```
+dir=./testdata/8 && ./evm t8n --state.fork=Berlin --input.alloc=$dir/alloc.json --input.txs=$dir/txs.json --input.env=$dir/env.json --trace && cat trace-* | grep SLOAD
+{"pc":1,"op":84,"gas":"0x484be","gasCost":"0x834","memory":"0x","memSize":0,"stack":["0x0"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+{"pc":4,"op":84,"gas":"0x47c86","gasCost":"0x834","memory":"0x","memSize":0,"stack":["0x3"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+{"pc":1,"op":84,"gas":"0x49cf6","gasCost":"0x834","memory":"0x","memSize":0,"stack":["0x0"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+{"pc":4,"op":84,"gas":"0x494be","gasCost":"0x834","memory":"0x","memSize":0,"stack":["0x3"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+{"pc":1,"op":84,"gas":"0x484be","gasCost":"0x64","memory":"0x","memSize":0,"stack":["0x0"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+{"pc":4,"op":84,"gas":"0x48456","gasCost":"0x64","memory":"0x","memSize":0,"stack":["0x3"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+
+```
+
+Simlarly, we can provide the input transactions via `stdin` instead of as file: 
+
+```
+dir=./testdata/8 \
+  && cat $dir/txs.json | jq "{txs: .}" \
+  | ./evm t8n --state.fork=Berlin \
+     --input.alloc=$dir/alloc.json \
+     --input.txs=stdin \
+     --input.env=$dir/env.json \
+     --trace  \
+  && cat trace-* | grep SLOAD
+
+{"pc":1,"op":84,"gas":"0x484be","gasCost":"0x834","memory":"0x","memSize":0,"stack":["0x0"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+{"pc":4,"op":84,"gas":"0x47c86","gasCost":"0x834","memory":"0x","memSize":0,"stack":["0x3"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+{"pc":1,"op":84,"gas":"0x49cf6","gasCost":"0x834","memory":"0x","memSize":0,"stack":["0x0"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+{"pc":4,"op":84,"gas":"0x494be","gasCost":"0x834","memory":"0x","memSize":0,"stack":["0x3"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+{"pc":1,"op":84,"gas":"0x484be","gasCost":"0x64","memory":"0x","memSize":0,"stack":["0x0"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+{"pc":4,"op":84,"gas":"0x48456","gasCost":"0x64","memory":"0x","memSize":0,"stack":["0x3"],"returnStack":[],"returnData":"0x","depth":1,"refund":0,"opName":"SLOAD","error":""}
+```
+
+If we try to execute it on older rules: 
+```
+dir=./testdata/8 && ./evm t8n --state.fork=Istanbul --input.alloc=$dir/alloc.json --input.txs=$dir/txs.json --input.env=$dir/env.json 
+INFO [01-21|23:21:51.265] rejected tx                              index=0 hash="d2818d…6ab3da" error="tx type not supported"
+INFO [01-21|23:21:51.265] rejected tx                              index=1 hash="26ea00…81c01b" from=0xa94f5374Fce5edBC8E2a8697C15331677e6EbF0B error="nonce too high: address 0xa94f5374Fce5edBC8E2a8697C15331677e6EbF0B, tx: 1 state: 0"
+INFO [01-21|23:21:51.265] rejected tx                              index=2 hash="698d01…369cee" error="tx type not supported"
+```
+Number `1` and `3` are not applicable, and therefore number `2` has wrong nonce. 
--- a/cmd/evm/testdata/8/txs.json
+++ b/cmd/evm/testdata/8/txs.json
@@ -0,0 +1,58 @@
+[
+  {
+    "gas": "0x4ef00",
+    "gasPrice": "0x1",
+    "chainId": "0x1",
+    "input": "0x",
+    "nonce": "0x0",
+    "to": "0x000000000000000000000000000000000000aaaa",
+    "value": "0x1",
+    "type" : "0x1",
+    "accessList": [
+      {"address": "0x0000000000000000000000000000000000000000",
+        "storageKeys": [
+          "0x0000000000000000000000000000000000000000000000000000000000000000",
+          "0x0000000000000000000000000000000000000000000000000000000000000000"
+        ]
+      }
+    ],
+    "v": "0x0",
+    "r": "0x0",
+    "s": "0x0",
+    "secretKey": "0x45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8"
+  },
+  {
+    "gas": "0x4ef00",
+    "gasPrice": "0x1",
+    "input": "0x",
+    "nonce": "0x1",
+    "to": "0x000000000000000000000000000000000000aaaa",
+    "value": "0x2",
+    "v": "0x0",
+    "r": "0x0",
+    "s": "0x0",
+    "secretKey": "0x45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8"
+  },
+  {
+    "gas": "0x4ef00",
+    "gasPrice": "0x1",
+    "chainId": "0x1",
+    "input": "0x",
+    "nonce": "0x2",
+    "to": "0x000000000000000000000000000000000000aaaa",
+    "value": "0x1",
+    "type" : "0x1",
+    "accessList": [
+      {"address": "0x000000000000000000000000000000000000aaaa",
+        "storageKeys": [
+          "0x0000000000000000000000000000000000000000000000000000000000000000",
+          "0x0000000000000000000000000000000000000000000000000000000000000003"
+        ]
+      }
+    ],
+    "v": "0x0",
+    "r": "0x0",
+    "s": "0x0",
+    "secretKey": "0x45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8"
+  }
+]
--- a/cmd/faucet/README.md
+++ b/cmd/faucet/README.md
@@ -0,0 +1,50 @@
+# Faucet
+
+The `faucet` is a simplistic web application with the goal of distributing small amounts of Ether in private and test networks.
+
+Users need to post their Ethereum addresses to fund in a Twitter status update or public Facebook post and share the link to the faucet. The faucet will in turn deduplicate user requests and send the Ether. After a funding round, the faucet prevents the same user requesting again for a pre-configured amount of time, proportional to the amount of Ether requested.
+
+## Operation
+
+The `faucet` is a single binary app (everything included) with all configurations set via command line flags and a few files.
+
+First thing's first, the `faucet` needs to connect to an Ethereum network, for which it needs the necessary genesis and network infos. Each of the following flags must be set:
+
+- `--genesis` is a path to a file containin the network `genesis.json`
+- `--network` is the devp2p network id used during connection
+- `--bootnodes` is a list of `enode://` ids to join the network through
+
+The `faucet` will use the `les` protocol to join the configured Ethereum network and will store its data in `$HOME/.faucet` (currently not configurable).
+
+## Funding
+
+To be able to distribute funds, the `faucet` needs access to an already funded Ethereum account. This can be configured via:
+
+- `--account.json` is a path to the Ethereum account's JSON key file
+- `--account.pass` is a path to a text file with the decryption passphrase
+
+The faucet is able to distribute various amounts of Ether in exchange for various timeouts. These can be configured via:
+
+- `--faucet.amount` is the number of Ethers to send by default
+- `--faucet.minutes` is the time to wait before allowing a rerequest
+- `--faucet.tiers` is the funding tiers to support  (x3 time, x2.5 funds)
+
+## Sybil protection
+
+To prevent the same user from exhausting funds in a loop, the `faucet` ties requests to social networks and captcha resolvers.
+
+Captcha protection uses Google's invisible ReCaptcha, thus the `faucet` needs to run on a live domain. The domain needs to be registered in Google's systems to retrieve the captcha API token and secrets. After doing so, captcha protection may be enabled via:
+
+- `--captcha.token` is the API token for ReCaptcha
+- `--captcha.secret` is the API secret for ReCaptcha
+
+Sybil protection via Twitter requires an API key as of 15th December, 2020. To obtain it, a Twitter user must be upgraded to developer status and a new Twitter App deployed with it. The app's `Bearer` token is required by the faucet to retrieve tweet data:
+
+- `--twitter.token` is the Bearer token for `v2` API access
+- `--twitter.token.v1` is the Bearer token for `v1` API access
+
+Sybil protection via Facebook uses the website to directly download post data thus does not currently require an API configuration. 
+
+## Miscellaneous
+
+Beside the above - mostly essential - CLI flags, there are a number that can be used to fine tune the `faucet`'s operation. Please see `faucet --help` for a full list.
--- a/cmd/faucet/faucet.go
+++ b/cmd/faucet/faucet.go
@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.

-// faucet is a Ether faucet backed by a light client.
+// faucet is an Ether faucet backed by a light client.
 package main

 //go:generate go-bindata -nometadata -o website.go faucet.html
@@ -43,18 +43,18 @@ import (

 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/accounts/keystore"
+	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/eth/downloader"
+	"github.com/ethereum/go-ethereum/eth/ethconfig"
 	"github.com/ethereum/go-ethereum/ethclient"
 	"github.com/ethereum/go-ethereum/ethstats"
 	"github.com/ethereum/go-ethereum/les"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/node"
 	"github.com/ethereum/go-ethereum/p2p"
-	"github.com/ethereum/go-ethereum/p2p/discv5"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/p2p/nat"
 	"github.com/ethereum/go-ethereum/params"
@@ -82,6 +82,9 @@ var (

 	noauthFlag = flag.Bool("noauth", false, "Enables funding requests without authentication")
 	logFlag    = flag.Int("loglevel", 3, "Log level to use for Ethereum and the faucet")
+
+	twitterTokenFlag   = flag.String("twitter.token", "", "Bearer token to authenticate with the v2 Twitter API")
+	twitterTokenV1Flag = flag.String("twitter.token.v1", "", "Bearer token to authenticate with the v1.1 Twitter API")
 )

 var (
@@ -150,9 +153,9 @@ func main() {
 		log.Crit("Failed to parse genesis block json", "err", err)
 	}
 	// Convert the bootnodes to internal enode representations
-	var enodes []*discv5.Node
+	var enodes []*enode.Node
 	for _, boot := range strings.Split(*bootFlag, ",") {
-		if url, err := discv5.ParseNode(boot); err == nil {
+		if url, err := enode.Parse(enode.ValidSchemes, boot); err == nil {
 			enodes = append(enodes, url)
 		} else {
 			log.Error("Failed to parse bootnode URL", "url", boot, "err", err)
@@ -209,7 +212,7 @@ type faucet struct {
 	nonce    uint64             // Current pending nonce of the faucet
 	price    *big.Int           // Current gas price to issue funds with

-	conns    []*websocket.Conn    // Currently live websocket connections
+	conns    []*wsConn            // Currently live websocket connections
 	timeouts map[string]time.Time // History of users and their funding timeouts
 	reqs     []*request           // Currently pending funding requests
 	update   chan struct{}        // Channel to signal request updates
@@ -217,7 +220,14 @@ type faucet struct {
 	lock sync.RWMutex // Lock protecting the faucet's internals
 }

-func newFaucet(genesis *core.Genesis, port int, enodes []*discv5.Node, network uint64, stats string, ks *keystore.KeyStore, index []byte) (*faucet, error) {
+// wsConn wraps a websocket connection with a write mutex as the underlying
+// websocket library does not synchronize access to the stream.
+type wsConn struct {
+	conn  *websocket.Conn
+	wlock sync.Mutex
+}
+
+func newFaucet(genesis *core.Genesis, port int, enodes []*enode.Node, network uint64, stats string, ks *keystore.KeyStore, index []byte) (*faucet, error) {
 	// Assemble the raw devp2p protocol stack
 	stack, err := node.New(&node.Config{
 		Name:    "geth",
@@ -237,10 +247,12 @@ func newFaucet(genesis *core.Genesis, port int, enodes []*discv5.Node, network u
 	}

 	// Assemble the Ethereum light client protocol
-	cfg := eth.DefaultConfig
+	cfg := ethconfig.Defaults
 	cfg.SyncMode = downloader.LightSync
 	cfg.NetworkId = network
 	cfg.Genesis = genesis
+	utils.SetDNSDiscoveryDefaults(&cfg, genesis.ToBlock(nil).Hash())
+
 	lesBackend, err := les.New(stack, &cfg)
 	if err != nil {
 		return nil, fmt.Errorf("Failed to register the Ethereum service: %w", err)
@@ -315,13 +327,14 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 	defer conn.Close()

 	f.lock.Lock()
-	f.conns = append(f.conns, conn)
+	wsconn := &wsConn{conn: conn}
+	f.conns = append(f.conns, wsconn)
 	f.lock.Unlock()

 	defer func() {
 		f.lock.Lock()
 		for i, c := range f.conns {
-			if c == conn {
+			if c.conn == conn {
 				f.conns = append(f.conns[:i], f.conns[i+1:]...)
 				break
 			}
@@ -349,7 +362,7 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 		if head == nil || balance == nil {
 			// Report the faucet offline until initial stats are ready
 			//lint:ignore ST1005 This error is to be displayed in the browser
-			if err = sendError(conn, errors.New("Faucet offline")); err != nil {
+			if err = sendError(wsconn, errors.New("Faucet offline")); err != nil {
 				log.Warn("Failed to send faucet error to client", "err", err)
 				return
 			}
@@ -360,7 +373,7 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 	f.lock.RLock()
 	reqs := f.reqs
 	f.lock.RUnlock()
-	if err = send(conn, map[string]interface{}{
+	if err = send(wsconn, map[string]interface{}{
 		"funds":    new(big.Int).Div(balance, ether),
 		"funded":   nonce,
 		"peers":    f.stack.Server().PeerCount(),
@@ -369,7 +382,7 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 		log.Warn("Failed to send initial stats to client", "err", err)
 		return
 	}
-	if err = send(conn, head, 3*time.Second); err != nil {
+	if err = send(wsconn, head, 3*time.Second); err != nil {
 		log.Warn("Failed to send initial header to client", "err", err)
 		return
 	}
@@ -384,9 +397,8 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 		if err = conn.ReadJSON(&msg); err != nil {
 			return
 		}
-		if !*noauthFlag && !strings.HasPrefix(msg.URL, "https://gist.github.com/") && !strings.HasPrefix(msg.URL, "https://twitter.com/") &&
-			!strings.HasPrefix(msg.URL, "https://plus.google.com/") && !strings.HasPrefix(msg.URL, "https://www.facebook.com/") {
-			if err = sendError(conn, errors.New("URL doesn't link to supported services")); err != nil {
+		if !*noauthFlag && !strings.HasPrefix(msg.URL, "https://twitter.com/") && !strings.HasPrefix(msg.URL, "https://www.facebook.com/") {
+			if err = sendError(wsconn, errors.New("URL doesn't link to supported services")); err != nil {
 				log.Warn("Failed to send URL error to client", "err", err)
 				return
 			}
@@ -394,7 +406,7 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 		}
 		if msg.Tier >= uint(*tiersFlag) {
 			//lint:ignore ST1005 This error is to be displayed in the browser
-			if err = sendError(conn, errors.New("Invalid funding tier requested")); err != nil {
+			if err = sendError(wsconn, errors.New("Invalid funding tier requested")); err != nil {
 				log.Warn("Failed to send tier error to client", "err", err)
 				return
 			}
@@ -410,7 +422,7 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {

 			res, err := http.PostForm("https://www.google.com/recaptcha/api/siteverify", form)
 			if err != nil {
-				if err = sendError(conn, err); err != nil {
+				if err = sendError(wsconn, err); err != nil {
 					log.Warn("Failed to send captcha post error to client", "err", err)
 					return
 				}
@@ -423,7 +435,7 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 			err = json.NewDecoder(res.Body).Decode(&result)
 			res.Body.Close()
 			if err != nil {
-				if err = sendError(conn, err); err != nil {
+				if err = sendError(wsconn, err); err != nil {
 					log.Warn("Failed to send captcha decode error to client", "err", err)
 					return
 				}
@@ -432,7 +444,7 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 			if !result.Success {
 				log.Warn("Captcha verification failed", "err", string(result.Errors))
 				//lint:ignore ST1005 it's funny and the robot won't mind
-				if err = sendError(conn, errors.New("Beep-bop, you're a robot!")); err != nil {
+				if err = sendError(wsconn, errors.New("Beep-bop, you're a robot!")); err != nil {
 					log.Warn("Failed to send captcha failure to client", "err", err)
 					return
 				}
@@ -441,36 +453,26 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 		}
 		// Retrieve the Ethereum address to fund, the requesting user and a profile picture
 		var (
+			id       string
 			username string
 			avatar   string
 			address  common.Address
 		)
 		switch {
-		case strings.HasPrefix(msg.URL, "https://gist.github.com/"):
-			if err = sendError(conn, errors.New("GitHub authentication discontinued at the official request of GitHub")); err != nil {
-				log.Warn("Failed to send GitHub deprecation to client", "err", err)
-				return
-			}
-			continue
-		case strings.HasPrefix(msg.URL, "https://plus.google.com/"):
-			//lint:ignore ST1005 Google is a company name and should be capitalized.
-			if err = sendError(conn, errors.New("Google+ authentication discontinued as the service was sunset")); err != nil {
-				log.Warn("Failed to send Google+ deprecation to client", "err", err)
-				return
-			}
-			continue
 		case strings.HasPrefix(msg.URL, "https://twitter.com/"):
-			username, avatar, address, err = authTwitter(msg.URL)
+			id, username, avatar, address, err = authTwitter(msg.URL, *twitterTokenV1Flag, *twitterTokenFlag)
 		case strings.HasPrefix(msg.URL, "https://www.facebook.com/"):
 			username, avatar, address, err = authFacebook(msg.URL)
+			id = username
 		case *noauthFlag:
 			username, avatar, address, err = authNoAuth(msg.URL)
+			id = username
 		default:
 			//lint:ignore ST1005 This error is to be displayed in the browser
 			err = errors.New("Something funky happened, please open an issue at https://github.com/ethereum/go-ethereum/issues")
 		}
 		if err != nil {
-			if err = sendError(conn, err); err != nil {
+			if err = sendError(wsconn, err); err != nil {
 				log.Warn("Failed to send prefix error to client", "err", err)
 				return
 			}
@@ -484,7 +486,7 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 			fund    bool
 			timeout time.Time
 		)
-		if timeout = f.timeouts[username]; time.Now().After(timeout) {
+		if timeout = f.timeouts[id]; time.Now().After(timeout) {
 			// User wasn't funded recently, create the funding transaction
 			amount := new(big.Int).Mul(big.NewInt(int64(*payoutFlag)), ether)
 			amount = new(big.Int).Mul(amount, new(big.Int).Exp(big.NewInt(5), big.NewInt(int64(msg.Tier)), nil))
@@ -494,7 +496,7 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 			signed, err := f.keystore.SignTx(f.account, tx, f.config.ChainID)
 			if err != nil {
 				f.lock.Unlock()
-				if err = sendError(conn, err); err != nil {
+				if err = sendError(wsconn, err); err != nil {
 					log.Warn("Failed to send transaction creation error to client", "err", err)
 					return
 				}
@@ -503,7 +505,7 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 			// Submit the transaction and mark as funded if successful
 			if err := f.client.SendTransaction(context.Background(), signed); err != nil {
 				f.lock.Unlock()
-				if err = sendError(conn, err); err != nil {
+				if err = sendError(wsconn, err); err != nil {
 					log.Warn("Failed to send transaction transmission error to client", "err", err)
 					return
 				}
@@ -518,20 +520,20 @@ func (f *faucet) apiHandler(w http.ResponseWriter, r *http.Request) {
 			timeout := time.Duration(*minutesFlag*int(math.Pow(3, float64(msg.Tier)))) * time.Minute
 			grace := timeout / 288 // 24h timeout => 5m grace

-			f.timeouts[username] = time.Now().Add(timeout - grace)
+			f.timeouts[id] = time.Now().Add(timeout - grace)
 			fund = true
 		}
 		f.lock.Unlock()

 		// Send an error if too frequent funding, othewise a success
 		if !fund {
-			if err = sendError(conn, fmt.Errorf("%s left until next allowance", common.PrettyDuration(time.Until(timeout)))); err != nil { // nolint: gosimple
+			if err = sendError(wsconn, fmt.Errorf("%s left until next allowance", common.PrettyDuration(time.Until(timeout)))); err != nil { // nolint: gosimple
 				log.Warn("Failed to send funding error to client", "err", err)
 				return
 			}
 			continue
 		}
-		if err = sendSuccess(conn, fmt.Sprintf("Funding request accepted for %s into %s", username, address.Hex())); err != nil {
+		if err = sendSuccess(wsconn, fmt.Sprintf("Funding request accepted for %s into %s", username, address.Hex())); err != nil {
 			log.Warn("Failed to send funding success to client", "err", err)
 			return
 		}
@@ -624,12 +626,12 @@ func (f *faucet) loop() {
 					"requests": f.reqs,
 				}, time.Second); err != nil {
 					log.Warn("Failed to send stats to client", "err", err)
-					conn.Close()
+					conn.conn.Close()
 					continue
 				}
 				if err := send(conn, head, time.Second); err != nil {
 					log.Warn("Failed to send header to client", "err", err)
-					conn.Close()
+					conn.conn.Close()
 				}
 			}
 			f.lock.RUnlock()
@@ -651,7 +653,7 @@ func (f *faucet) loop() {
 			for _, conn := range f.conns {
 				if err := send(conn, map[string]interface{}{"requests": f.reqs}, time.Second); err != nil {
 					log.Warn("Failed to send requests to client", "err", err)
-					conn.Close()
+					conn.conn.Close()
 				}
 			}
 			f.lock.RUnlock()
@@ -661,44 +663,63 @@ func (f *faucet) loop() {

 // sends transmits a data packet to the remote end of the websocket, but also
 // setting a write deadline to prevent waiting forever on the node.
-func send(conn *websocket.Conn, value interface{}, timeout time.Duration) error {
+func send(conn *wsConn, value interface{}, timeout time.Duration) error {
 	if timeout == 0 {
 		timeout = 60 * time.Second
 	}
-	conn.SetWriteDeadline(time.Now().Add(timeout))
-	return conn.WriteJSON(value)
+	conn.wlock.Lock()
+	defer conn.wlock.Unlock()
+	conn.conn.SetWriteDeadline(time.Now().Add(timeout))
+	return conn.conn.WriteJSON(value)
 }

 // sendError transmits an error to the remote end of the websocket, also setting
 // the write deadline to 1 second to prevent waiting forever.
-func sendError(conn *websocket.Conn, err error) error {
+func sendError(conn *wsConn, err error) error {
 	return send(conn, map[string]string{"error": err.Error()}, time.Second)
 }

 // sendSuccess transmits a success message to the remote end of the websocket, also
 // setting the write deadline to 1 second to prevent waiting forever.
-func sendSuccess(conn *websocket.Conn, msg string) error {
+func sendSuccess(conn *wsConn, msg string) error {
 	return send(conn, map[string]string{"success": msg}, time.Second)
 }

 // authTwitter tries to authenticate a faucet request using Twitter posts, returning
-// the username, avatar URL and Ethereum address to fund on success.
-func authTwitter(url string) (string, string, common.Address, error) {
+// the uniqueness identifier (user id/username), username, avatar URL and Ethereum address to fund on success.
+func authTwitter(url string, tokenV1, tokenV2 string) (string, string, string, common.Address, error) {
 	// Ensure the user specified a meaningful URL, no fancy nonsense
 	parts := strings.Split(url, "/")
 	if len(parts) < 4 || parts[len(parts)-2] != "status" {
 		//lint:ignore ST1005 This error is to be displayed in the browser
-		return "", "", common.Address{}, errors.New("Invalid Twitter status URL")
+		return "", "", "", common.Address{}, errors.New("Invalid Twitter status URL")
 	}
-	// Twitter's API isn't really friendly with direct links. Still, we don't
-	// want to do ask read permissions from users, so just load the public posts
+	// Strip any query parameters from the tweet id and ensure it's numeric
+	tweetID := strings.Split(parts[len(parts)-1], "?")[0]
+	if !regexp.MustCompile("^[0-9]+$").MatchString(tweetID) {
+		return "", "", "", common.Address{}, errors.New("Invalid Tweet URL")
+	}
+	// Twitter's API isn't really friendly with direct links.
+	// It is restricted to 300 queries / 15 minute with an app api key.
+	// Anything more will require read only authorization from the users and that we want to avoid.
+
+	// If Twitter bearer token is provided, use the API, selecting the version
+	// the user would prefer (currently there's a limit of 1 v2 app / developer
+	// but unlimited v1.1 apps).
+	switch {
+	case tokenV1 != "":
+		return authTwitterWithTokenV1(tweetID, tokenV1)
+	case tokenV2 != "":
+		return authTwitterWithTokenV2(tweetID, tokenV2)
+	}
+	// Twiter API token isn't provided so we just load the public posts
 	// and scrape it for the Ethereum address and profile URL. We need to load
 	// the mobile page though since the main page loads tweet contents via JS.
 	url = strings.Replace(url, "https://twitter.com/", "https://mobile.twitter.com/", 1)

 	res, err := http.Get(url)
 	if err != nil {
-		return "", "", common.Address{}, err
+		return "", "", "", common.Address{}, err
 	}
 	defer res.Body.Close()

@@ -706,31 +727,115 @@ func authTwitter(url string) (string, string, common.Address, error) {
 	parts = strings.Split(res.Request.URL.String(), "/")
 	if len(parts) < 4 || parts[len(parts)-2] != "status" {
 		//lint:ignore ST1005 This error is to be displayed in the browser
-		return "", "", common.Address{}, errors.New("Invalid Twitter status URL")
+		return "", "", "", common.Address{}, errors.New("Invalid Twitter status URL")
 	}
 	username := parts[len(parts)-3]

 	body, err := ioutil.ReadAll(res.Body)
 	if err != nil {
-		return "", "", common.Address{}, err
+		return "", "", "", common.Address{}, err
 	}
 	address := common.HexToAddress(string(regexp.MustCompile("0x[0-9a-fA-F]{40}").Find(body)))
 	if address == (common.Address{}) {
 		//lint:ignore ST1005 This error is to be displayed in the browser
-		return "", "", common.Address{}, errors.New("No Ethereum address found to fund")
+		return "", "", "", common.Address{}, errors.New("No Ethereum address found to fund")
 	}
 	var avatar string
 	if parts = regexp.MustCompile("src=\"([^\"]+twimg.com/profile_images[^\"]+)\"").FindStringSubmatch(string(body)); len(parts) == 2 {
 		avatar = parts[1]
 	}
-	return username + "@twitter", avatar, address, nil
+	return username + "@twitter", username, avatar, address, nil
+}
+
+// authTwitterWithTokenV1 tries to authenticate a faucet request using Twitter's v1
+// API, returning the user id, username, avatar URL and Ethereum address to fund on
+// success.
+func authTwitterWithTokenV1(tweetID string, token string) (string, string, string, common.Address, error) {
+	// Query the tweet details from Twitter
+	url := fmt.Sprintf("https://api.twitter.com/1.1/statuses/show.json?id=%s", tweetID)
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return "", "", "", common.Address{}, err
+	}
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", "", "", common.Address{}, err
+	}
+	defer res.Body.Close()
+
+	var result struct {
+		Text string `json:"text"`
+		User struct {
+			ID       string `json:"id_str"`
+			Username string `json:"screen_name"`
+			Avatar   string `json:"profile_image_url"`
+		} `json:"user"`
+	}
+	err = json.NewDecoder(res.Body).Decode(&result)
+	if err != nil {
+		return "", "", "", common.Address{}, err
+	}
+	address := common.HexToAddress(regexp.MustCompile("0x[0-9a-fA-F]{40}").FindString(result.Text))
+	if address == (common.Address{}) {
+		//lint:ignore ST1005 This error is to be displayed in the browser
+		return "", "", "", common.Address{}, errors.New("No Ethereum address found to fund")
+	}
+	return result.User.ID + "@twitter", result.User.Username, result.User.Avatar, address, nil
+}
+
+// authTwitterWithTokenV2 tries to authenticate a faucet request using Twitter's v2
+// API, returning the user id, username, avatar URL and Ethereum address to fund on
+// success.
+func authTwitterWithTokenV2(tweetID string, token string) (string, string, string, common.Address, error) {
+	// Query the tweet details from Twitter
+	url := fmt.Sprintf("https://api.twitter.com/2/tweets/%s?expansions=author_id&user.fields=profile_image_url", tweetID)
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return "", "", "", common.Address{}, err
+	}
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", "", "", common.Address{}, err
+	}
+	defer res.Body.Close()
+
+	var result struct {
+		Data struct {
+			AuthorID string `json:"author_id"`
+			Text     string `json:"text"`
+		} `json:"data"`
+		Includes struct {
+			Users []struct {
+				ID       string `json:"id"`
+				Username string `json:"username"`
+				Avatar   string `json:"profile_image_url"`
+			} `json:"users"`
+		} `json:"includes"`
+	}
+
+	err = json.NewDecoder(res.Body).Decode(&result)
+	if err != nil {
+		return "", "", "", common.Address{}, err
+	}
+
+	address := common.HexToAddress(regexp.MustCompile("0x[0-9a-fA-F]{40}").FindString(result.Data.Text))
+	if address == (common.Address{}) {
+		//lint:ignore ST1005 This error is to be displayed in the browser
+		return "", "", "", common.Address{}, errors.New("No Ethereum address found to fund")
+	}
+	return result.Data.AuthorID + "@twitter", result.Includes.Users[0].Username, result.Includes.Users[0].Avatar, address, nil
 }

 // authFacebook tries to authenticate a faucet request using Facebook posts,
 // returning the username, avatar URL and Ethereum address to fund on success.
 func authFacebook(url string) (string, string, common.Address, error) {
 	// Ensure the user specified a meaningful URL, no fancy nonsense
-	parts := strings.Split(url, "/")
+	parts := strings.Split(strings.Split(url, "?")[0], "/")
+	if parts[len(parts)-1] == "" {
+		parts = parts[0 : len(parts)-1]
+	}
 	if len(parts) < 4 || parts[len(parts)-2] != "posts" {
 		//lint:ignore ST1005 This error is to be displayed in the browser
 		return "", "", common.Address{}, errors.New("Invalid Facebook post URL")
@@ -740,7 +845,13 @@ func authFacebook(url string) (string, string, common.Address, error) {
 	// Facebook's Graph API isn't really friendly with direct links. Still, we don't
 	// want to do ask read permissions from users, so just load the public posts and
 	// scrape it for the Ethereum address and profile URL.
-	res, err := http.Get(url)
+	//
+	// Facebook recently changed their desktop webpage to use AJAX for loading post
+	// content, so switch over to the mobile site for now. Will probably end up having
+	// to use the API eventually.
+	crawl := strings.Replace(url, "www.facebook.com", "m.facebook.com", 1)
+
+	res, err := http.Get(crawl)
 	if err != nil {
 		return "", "", common.Address{}, err
 	}
--- a/cmd/faucet/faucet.html
+++ b/cmd/faucet/faucet.html
@@ -177,7 +177,7 @@
 						}
 						// Iterate over our entire local collection and re-render the funding table
 						var content = "";
-						for (var i=0; i<requests.length; i++) {
+						for (var i=requests.length-1; i >= 0; i--) {
 							var done    = requests[i].time == "";
 							var elapsed = moment().unix()-moment(requests[i].time).unix();

--- a/cmd/faucet/faucet_test.go
+++ b/cmd/faucet/faucet_test.go
@@ -0,0 +1,43 @@
+// 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 main
+
+import (
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+)
+
+func TestFacebook(t *testing.T) {
+	for _, tt := range []struct {
+		url  string
+		want common.Address
+	}{
+		{
+			"https://www.facebook.com/fooz.gazonk/posts/2837228539847129",
+			common.HexToAddress("0xDeadDeaDDeaDbEefbEeFbEEfBeeFBeefBeeFbEEF"),
+		},
+	} {
+		_, _, gotAddress, err := authFacebook(tt.url)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if gotAddress != tt.want {
+			t.Fatalf("address wrong, have %v want %v", gotAddress, tt.want)
+		}
+	}
+}
--- a/Show More
+++ b/Show More