README.md

typed-data-encoder example

1. Clone this gist and cd into the directory.
2. yarn
3. node genTypedData.js to print the JSON payload
4. Paste a signature into verifyTypedData.js
5. node verifyTypedData.js to print the signer address for the pasted signature

genTypedData.js

const { genTypedData } = require('./utils')

const main = async () => {
    const payload = genTypedData()
    console.log(JSON.stringify(payload, null, 2))
}

main()

package.json

{
  "name": "typed-data-encoder-example",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "ethers": "^5.5.2"
  }
}

utils.js

const ethers = require('ethers')

const params = {
    // Replace with the chainId of the chain that the L1Migrator is deployed on
    chainId: 1,
    // Replace with the address of the L1Migrator
    verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC',
    // Replace with the address that is migrating from L1
    l1Addr: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC',
    // Replace with the address to use on L2
    l2Addr: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC'
}

const domain = {
    name: 'Livepeer L1Migrator',
    version: '1',
    chainId: params.chainId,
    verifyingContract: params.verifyingContract
}

const types = {
    MigrateDelegator: [
        { name: 'l1Addr', type: 'address' },
        { name: 'l2Addr', type: 'address' }
    ]
}

const value = {
    l1Addr: params.l1Addr,
    l2Addr: params.l2Addr
}

const genTypedData = () => {
    const payload = ethers.utils._TypedDataEncoder.getPayload(domain, types, value)
    return payload
}

module.exports = {
    genTypedData,
    domain,
    types,
    value
}

verifyTypedData.js

const ethers = require('ethers')
const { domain, types, value } = require('./utils')

const main = async () => {
    // Replace with actual signature
    const sig = ""
    const signer = ethers.utils.verifyTypedData(domain, types, value, sig)
    // If l1Addr is the address signing, then the following should be equal to l1Addr after calling verifyTypedData
    console.log(signer)
}

main()