Trustless Developer Guide - Authentication Example

efx_auth.js

// This example shows how to generate the signature from a raw private key
// Signing using hardware wallets such as Ledger or Trezor can be done using their documentation

const ethUtils = require('ethereumjs-utils')

const privKey = /* Your Private Key */
const nonce = ((Date.now() / 1000) + 350) + ''

const hash = ethUtils.hashPersonalMessage(ethUtils.toBuffer(nonce.toString(16)))
const signature = ethUtils.ecsign(hash, privKey)

const response = await efx.contract.unlock(token, amount, nonce, signature)