Account Update

Fee Delegation

Import the ethers and @kaiachain/ethers-ext packages to add kaia features on ethers.js

Declaring sender , fee payer address and private keys.

senderNewPriv is the private key to be updated

Creating a JSON-RPC provider instance with the specified URL

Also, you can change the default provider. For example, using the alchemy provider.

Compute new public key from new private key

Creating a transaction object to update new publickey

Populate the transaction with sender's wallet.

Sign the transaction with senderWallet

Send the transaction to blockchain using fee payer's wallet. Function sendTransactionAsFeePayer adds a signature with FeePayer’s private key to the sender’s signature and transmits it to the blockchain network.

Wait for the transaction receipt

TxTypeFeeDelegatedAccountUpdate.js


const ethers = require("ethers");
const { Wallet, TxType, AccountKeyType } = require("@kaiachain/ethers-ext/v6");
// Using senderPriv == senderNewPriv to execute this example repeatedly.
// But you might want to register a different private key.
const senderAddr = "0xe15cd70a41dfb05e7214004d7d054801b2a2f06b";
const senderPriv = "0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8";
const senderNewPriv = "0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8";
const feePayerAddr = "0xcb0eb737dfda52756495a5e08a9b37aab3b271da";
const feePayerPriv = "0x9435261ed483b6efa3886d6ad9f64c12078a0e28d8d80715c773e16fc000cff4";
const provider = new ethers.JsonRpcProvider("https://public-en-kairos.node.kaia.io");
const senderWallet = new Wallet(senderAddr, senderPriv, provider); // decoupled account
const feePayerWallet = new Wallet(feePayerPriv, provider);
async function main() {
  const pub = ethers.SigningKey.computePublicKey(senderNewPriv, true);
  console.log("pub", pub);
  const tx = {
    type: TxType.FeeDelegatedAccountUpdate,
    from: senderAddr,
    key: {
      type: AccountKeyType.Public,
      key: pub,
    }
  };
  // Sign transaction by sender
  const populatedTx = await senderWallet.populateTransaction(tx);
  const senderTxHashRLP = await senderWallet.signTransaction(populatedTx);
  console.log("senderTxHashRLP", senderTxHashRLP);
  // Sign and send transaction by fee payer
  const sentTx = await feePayerWallet.sendTransactionAsFeePayer(senderTxHashRLP);
  console.log("sentTx", sentTx.hash);
  const receipt = await sentTx.wait();
  console.log("receipt", receipt);
}
main();

output


❯ node TxTypeFeeDelegatedAccountUpdate.js
pub 0x03dc9dccbd788c00fa98f7f4082f2f714e799bc0c29d63f04d48b54fe6250453cd
senderTxHashRLP 0x21f88c73850ba43b740082cd1494e15cd70a41dfb05e7214004d7d054801b2a2f06ba302a103dc9dccbd788c00fa98f7f4082f2f714e799bc0c29d63f04d48b54fe6250453cdf847f8458207f5a0b1671119941dc92cde038dfe10284b7a41d5ab7fadef6be3480e919c63138dc0a06f1097e05153a83f1353efb579c191070caf5824929fbb7e7b79a266c1746b61
sentTx 0xaf6c1121ce8d7d43cfd229b7f026d73049b6982c8f9e24cc3b0f958d1c4d75bb
receipt {
  to: '0xe15Cd70A41dfb05e7214004d7D054801b2a2f06b',
  from: '0xe15Cd70A41dfb05e7214004d7D054801b2a2f06b',
  contractAddress: null,
  transactionIndex: 2,
  gasUsed: BigNumber { _hex: '0xc738', _isBigNumber: true },
  logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
  blockHash: '0x5db31996350447e3aee600ef259f7a381c16a40ecdc0d7e6b3ac4125e86ff400',
  transactionHash: '0xaf6c1121ce8d7d43cfd229b7f026d73049b6982c8f9e24cc3b0f958d1c4d75bb',
  logs: [],
  blockNumber: 148732537,
  confirmations: 3,
  cumulativeGasUsed: BigNumber { _hex: '0x05d4ab', _isBigNumber: true },
  effectiveGasPrice: BigNumber { _hex: '0x05d21dba00', _isBigNumber: true },
  status: 1,
  type: 0,
  byzantium: true
}