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");

// 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.providers.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.utils.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

}