Reconstruction of tornado-instances

This is a (NOT-MINIMAL) reconstruction of the Tornado Cash tornado-instances repository with additional contract variants added. It is not minimal because some dependencies, because of the Github takedowns (and other stuff), had annoying build issues (at least for me) which made me inline a lot of the contract code.

Just like with relayer-registry, one annoying part of univ3 core code had to be edited to compile with 0.6.12, meaning that you should execute yarn build before compiling the contracts.

There is currently NO tests for the contract variations or anything which the original authors did not write, due to the simplicity and the nature (non custodial) of the contracts, they can mostly be easily reviewed bar the cloneable versions of ETHTornado and ERC20Tornado.

The old README follows:

Tornado Pool Factory

About

Separate instance of Tornado classic is needed for each [token, denomination] pair. This repository contains smart contracts of Tornado Pool Factory, which is used to create and register new pools:

• factory creates a new Tornado pool
• if there is pool registry on this chain (only ETH mainnet for now), the factory also creates governance proposal for registration new pool in instance registry

There are two deployed contracts:

1. InstanceFactory - instance factory for the creation of new Tornado ERC20/native pools
2. InstanceProposalCreator - governance proposal factory for the addition of new Tornado instances to the Tornado instance registry

InstanceFactory

Anyone for sidechains and only governance for mainnet can create a new instance by calling createInstanceClone method of the factory with parameters:

1. address token - address of ERC20 token for a new instance, zero address for the native currency
2. uint256 denomination - denomination for new instance (tokens can only be deposited in certain denominations into Tornado instances)

InstanceProposalCreator

Anyone can create a governance proposal for the addition of a new instance by calling createProposalApprove/createProposalPermit method of the factory with parameters (proposal creation fee in TORN is charged from the sender):

1. address token - address of ERC20 token for a new instance, zero address for the native instance
2. uint24 uniswapPoolSwappingFee - fee value of Uniswap instance which will be used for TORN/token price determination. 3000 means 0.3% fee Uniswap pool. Zero value for the native instance.
3. uint256[] denominations - list of denominations for each new instance (tokens can only be deposited in certain denominations into instances).
4. uint32[] protocolFees - list of protocol fees for each new instance (this fee is only charged from registrated relayer during withdrawal process). 100 means 1% of instance denomination fee for withdrawal throw registrated relayer.

Parameters

InstanceProposalCreator

1. max number of new instances in one proposal - the current version supports the addition of a maximum of 4 instances at once.
2. proposal creation fee - this fee is charged from creator of the proposal during createProposalApprove/createProposalPermit factory method execution. It can be changed by governance. Default value is stored in config.js.
3. TWAPSlotsMin - minimum number of TWAP slots for Uniswap pool that is chosen during createProposalApprove/createProposalPermit factory method call. It can be changed by governance. The default value is stored in config.js.

Warnings

1. This version of the factory creates a proposal for immutable Tornado instance initialization.

Tests

Setting up the repository:

    yarn
    cp .env.example .env

Please fill out .env according to the template provided in it. Please ensure that all of the example values are set to the correct addresses.

To run test scripts:

    yarn test

Test scripts cover instance factory deployment, proposal deployment, and executing proposal.

Deploy

Check config.js for actual values.

With salt = 0x0000000000000000000000000000000000000000000000000000000047941987 address must be:

1. SidechainInstanceFactory - 0x3D36D4b204E68e8A1431ec31Bea1fFbA3eC04590
2. SidechainInstanceFactory proxy - 0x9d5C91ccF5c58b312896C4B4De45426fA128b001
3. InstanceFactory - 0x83216783423500116723884F70dB44fB7BBb855b
4. InstanceFactory proxy - 0x300aF836C74c1Af73f4353130AC1314Ed59B6a0A
5. InstanceProposalCreator - 0x2b73b3555F1904CB8042cA6703734438eD4F28a0
6. InstanceProposalCreator proxy - 0x84E013c8699Cb115906929B68b1Dc5ca5B2Fc46c

Check addresses with current config:

    yarn compile
    node -e 'require("./src/generateAddresses").generateWithLog()'

Deploy SidechainInstanceFactory:

Check config.js for the actual admin value for this sidechain (TornadoCash community multisig).

    yarn hardhat run scripts/deploySidechainInstanceFactory.js --network mainnet

Deploy InstanceProposalCreator + InstanceFactory (ETH mainnet):

    yarn hardhat run scripts/deployInstanceProposalCreator.js --network mainnet

Verify on Etherscan:

    yarn hardhat verify --network <network-name> <contract-address> <constructor-arguments>