ZkSync Paymaster

YouTube video

zkSolc-Bin Compiler

IPaymaster Interface Code

zkSync Ethers

• Make sure solc is available on the system. Check with solc --version. If not, use brew install solidity

Check to make sure binary compiler is working

1. Download binary compiler from zkSolc repo
2. Create basic contract to test compiling
3. Run the following chmod +x ./zksolc-macosx-amd64-v1.4.1
4. Run the following ./zksolc-macosx-amd64-v1.4.1 --combined-json abi,bin contracts/Paymaster.sol > artifacts/Paymaster.json

Generate a private key locally

$ node
> require('crypto').randomBytes(32).toString('hex')
> .exit

Run script to create Contract

$ node scripts/deploy.js

0x45Be9d07374cbB4195187f8FA2458b43696D9de1 # Deploy wallet address
5000000000000000n # initial balance (.005 ETH)
0x2D4a1DF404136DC98540a5e7244A1ac52ba22584 # Paymaster address

Run script to sponsor gas

$ node scripts/gasSponsor.js
Destination address 0
{
  transaction: TransactionResponse {
    provider: Provider { _contractAddresses: {} },
    blockNumber: null,
    blockHash: null,
    index: undefined,
    hash: '0x786e847b261d3754a7e7213b069883b0f11ccfd07da45084d76b13a5065821b8',
    type: 113,
    to: '0x2d4A1df404136DC98540A5E7244A1ac52Ba22585',
    from: '0xA0bfc908E057CfA1Ea9eaDD8B5b3aAdBB65C8BBE',
    nonce: 0,
    gasLimit: 7517422n,
    gasPrice: undefined,
    maxPriorityFeePerGas: 54564953n,
    maxFeePerGas: 54564953n,
    maxFeePerBlobGas: null,
    data: '0x1337',
    value: 0n,
    chainId: 300n,
    signature: Signature { r: "0x0000000000000000000000000000000000000000000000000000000000000000", s: "0x0000000000000000000000000000000000000000000000000000000000000000", yParity: 0, networkV: null },
    accessList: null,
    blobVersionedHashes: null,
    l1BatchNumber: undefined,
    l1BatchTxIndex: undefined
}