Account Update

Import the web3 and @kaiachain/web3js-ext packages to add kaia features on web3

Define sender address, sender private key and new private key to be changed

Define fee payer address and private key

Set up the provider with the specified kairos testnet URL. A provider in web3 is a read-only abstraction to access the blockchain data.

Also, you can change the provider URL from kairos to quicknode

Create a sender's wallet with the private key using web3.eth.accounts.privateKeyToAccount

Create a fee payer's wallet with the private key using web3.eth.accounts.privateKeyToAccount

Generating the public key from the new private key using getPublicKeyFromPrivate

Creating a transaction object with type: TxType.FeeDelegatedAccountUpdate and key contains new public key

Sign the transaction with the sender account

Use fee payer account to sign the transaction with signTransactionAsFeePayer

Send the signed transaction to blockchain with web3.eth.sendSignedTransaction. It will return the transaction receipt

TxTypeFeeDelegatedAccountUpdate.js


const { Web3, TxType, AccountKeyType, getPublicKeyFromPrivate } = require("@kaiachain/web3js-ext");
// Using senderPriv == senderNewPriv to execute this example repeatedly.
// But you might want to register a different private key.
const senderAddr = "0x30908464d76604420162a6c880c0e1c7e641bad7";
const senderPriv = "0xf8cc7c3813ad23817466b1802ee805ee417001fcce9376ab8728c92dd8ea0a6b";
const senderNewPriv = "0xf8cc7c3813ad23817466b1802ee805ee417001fcce9376ab8728c92dd8ea0a6b";
const feePayerAddr = "0xcb0eb737dfda52756495a5e08a9b37aab3b271da";
const feePayerPriv = "0x9435261ed483b6efa3886d6ad9f64c12078a0e28d8d80715c773e16fc000cff4";
const provider = new Web3.providers.HttpProvider("https://public-en-kairos.node.kaia.io");
const web3 = new Web3(provider);
const senderAccount = web3.eth.accounts.privateKeyToAccount(senderPriv);
const feePayerAccount = web3.eth.accounts.privateKeyToAccount(feePayerPriv);
async function main() {
  const publicKey = getPublicKeyFromPrivate(senderNewPriv);
  console.log({ publicKey });
  const tx = {
    type: TxType.FeeDelegatedAccountUpdate,
    from: senderAddr,
    key: {
      type: AccountKeyType.Public,
      key: publicKey
    },
  };
  // Sign transaction by sender
  const signResult1 = await senderAccount.signTransaction(tx);
  console.log("senderTxHashRLP", signResult1.rawTransaction);
  // Sign and send transaction by fee payer
  const signResult2 = await feePayerAccount.signTransactionAsFeePayer(signResult1.rawTransaction);
  console.log("signedTx", signResult2.transactionHash);
  const receipt = await web3.eth.sendSignedTransaction(signResult2.rawTransaction);
  console.log("receipt", receipt);
}
main();

output


❯ js TxTypeFeeDelegatedAccountUpdate.js
{
  publicKey: '0x02dbac81e8486d68eac4e6ef9db617f7fbd79a04a3b323c982a09cdfc61f0ae0e8'
}
senderTxHashRLP 0x21f88d0c850ba43b7400830205949430908464d76604420162a6c880c0e1c7e641bad7a302a102dbac81e8486d68eac4e6ef9db617f7fbd79a04a3b323c982a09cdfc61f0ae0e8f847f8458207f6a06aa4e32d36dd96da8cb0f2404d81302d855defbaabf4fdbf176aabf415179564a02161361ff91f14ebccc265c55c6dff8f4fbba4b467da07c1283d8e5991051cb0
signedTx 0xbf72aae23989ca58eabfca9bd84b1ad9d60354e22b55102f5f5d4af18725a58e
receipt {
  blockHash: '0x8d14709da1890fcefa545bdc4f4bccacbed948d799db2c34c9eb87deeb3b1e08',
  blockNumber: 148744920n,
  cumulativeGasUsed: 429478n,
  effectiveGasPrice: 25000000000n,
  from: '0x30908464d76604420162a6c880c0e1c7e641bad7',
  gasUsed: 51000n,
  logs: [],
  logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
  status: 1n,
  to: '0x30908464d76604420162a6c880c0e1c7e641bad7',
  transactionHash: '0xbf72aae23989ca58eabfca9bd84b1ad9d60354e22b55102f5f5d4af18725a58e',
  transactionIndex: 2n,
  type: 0n
}