[ethereum] privatekey를 이용하여 address 복구, transaction 발생

privateKeyToAccount()를 이용하면 privatekey를 이용하여 account를 가져올 수 있습니다.

 

let Web3 = require('web3')
let web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io'));

let PK = "0x1076f9a014620c526eaf424cad97755a8d5c1a492f2637731f56975d30805db6"

let account = web3.eth.accounts.privateKeyToAccount(PK)
console.log(account)

· 실행결과

{ address: '0x31bF95273C33C9042da801580F6d54a6f11b3CfE',
  privateKey:
   '0x1076f9a014620c526eaf424cad97755a8d5c1a492f2637731f56975d30805db6',
  signTransaction: [Function: signTransaction],
  sign: [Function: sign],
  encrypt: [Function: encrypt] }

가져온 account에서 encrypt를 이용하면 keystore를 만들 수 있고, signTransactio을 이용하면 트랜잭션에 서명하여 rawTransaction을 만들 수 있습니다.

​

· sample

let Web3 = require('web3')
let web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io'));

/*
  web3.utils.toWei(1, 'ether')  : 1ETH        => 1 * 10 ^ 18
  web3.utils.fromWei(1, 'ether'): 1 * 10 ^ 18 => 1ETH
*/

(async () => {
  let EOA1 = "0x31bF95273C33C9042da801580F6d54a6f11b3CfE"
  let PK = "0x1076f9a014620c526eaf424cad97755a8d5c1a492f2637731f56975d30805db6"
  let EOA2 = "0x22C353816541d2437dd9Aa673Be0de07d869df6B"

  let eoa1_nonce = await web3.eth.getTransactionCount(EOA1, "pending")
  let balance = await web3.eth.getBalance(EOA1)
  
  console.log(eoa1_nonce)
  console.log(balance)
  console.log(web3.utils.toWei("0.1", 'ether'))
  console.log(web3.utils.toWei("21", 'Gwei'))

  let txParam = {
    nonce: eoa1_nonce,
    from: EOA1,
    to: EOA2,
    value: web3.utils.toHex(web3.utils.toWei("0.1", 'ether')), // 0.1 이더
    gasPrice: web3.utils.toHex(web3.utils.toWei("21", 'Gwei')), // 가스 가격
    gasLimit: web3.utils.toHex(300000), // 가스 최대 사용량
  }

  let account = web3.eth.accounts.privateKeyToAccount(PK)
  let signedTx = await account.signTransaction(txParam)

  let txInfo = await web3.eth.sendSignedTransaction(signedTx.rawTransaction, (err, txHash) => {
    if (err) {
      console.log('========== transaction 발생 중 에러 ===========')  
      return
    }
    console.log('========== transaction 발생 ===========')
    console.log(txHash)
  })

  console.log('========== transaction 처리완료 ===========')
  console.log(txInfo)
})()