EIP1271 Module

A simple library to validate EIP1271 signatures.

Usage

Simple usage

import {
  isValidEip1271Signature,
  isValidEip1271SignatureForAllNetworks,
  mainnet,
  polygon
} from '@cometh/eip1271-signature-validation'
import { hashMessage } from 'viem'
import { mnemonicToAccount } from 'viem/accounts'
import { MNEMONIC, RPC, EIP712_SAFE_MESSAGE_TYPE } from './constants'

const checkSig = async () => {
  const account = mnemonicToAccount(MNEMONIC) // owner of the smart contract wallet

  const signature = account.signMessage({
    message: 'Hello world'
  })

  const networks = [mainnet, polygon]

  const isValidSig = await isValidEip1271Signature(
    walletAddress,
    message,
    signature,
    networks
  )

  console.log('is signature valid:', isValidSig) // Returns a single boolean

  const isValidSigPerNetwork = await isValidEip1271SignatureForAllNetworks(
    walletAddress,
    message,
    signature,
    networks
  )

  console.log('is signature valid for each network:', isValidSigPerNetwork) // Returns an array of booleans with chainId for each network you provided a RPC URL for eg. [{ chainId: 1, name: "mainnet", valid: true }, { chainId: 56, name: "bnb", valid: false }, ...]
}