Overview

An implementation of zkSync's account abstraction and paymaster with a batched transaction and daily spending limit feature. You can find and explore more details about zkSync and those features in the documentation below.

• zkSync Developer Doc
• Account Abstraction
• Tutorial: Account Abstraction
• Tutorial: Paymaster

Developments

Account

zkSync Account Abstraction contract wallet. Architecture is inspired by Gnosis Safe. Account.sol and BaseAccount.sol.

Batch transaction

Account.sol has multicall feature so that it can facilitate batched transactions with _executeBatchTransaction where for-loop utilizes targets[] and methods[] data which respectively store contract addresses and functions. As such, in a batched transaction, msg.data isn't single hexlified method data but a batched multiple transaction data encoded with AbiCoder.encode() method.

Sponsored Transaction

As zksync-unique approvalBased paymaster flow is supported, MyPaymaster.sol allows the account to both proceed gas-sponsored transcations and gas payments in ERC20. Also, it calculates the actual gas cost in ERC20 terms with the price data retrieved from chainlink oracle.

Spending limit

The daily-spending limit feature can be enabled for the account, where it refuses the account to spend in ETH/ERC20 more than a configured limit amount.

!Currently, deploy and test folders in this repo don't work as they haven't been updated for new contracts

Deployment & Test

git clone git@github.com:porco-rosso-j/zksync-aa-wallet-paymaster.git

• Enter the repo and install dependencies.

cd zksync-aa-wallet-paymaster
npm i

• To set-up local environment, Docker and docker-compose should be installed.
  If they are not installed on your computer: Install.

• To run zkSync local chain, do:

git clone https://github.com/matter-labs/local-setup.git
cd local-setup
./start.sh

*check details and common errors for running local zksync chain here.

• compile:

npm run compile

• additional configuration: add .env file touch .env and add NODE_ENV=test in it.

• deploy:

npx hardhat deploy-zksync --script deploy/<file-name>.ts

example:

npx hardhat deploy-zksync --script deploy/deploy-paymaster.ts

• test:

npm run test:integration