Legacy Account Key

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

Define sender's address and private key

Define receiver's address

Set up the provider with the specified kairos testnet URL. A provider in web3js is a read-only abstraction to access the blockchain data.

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

Define a web3 instance using the provider

Create a sender's wallet with the private key and provider

Create a value transfer transaction, use toPeb helper to convert amount from KLAY to Peb

Sign the transaction with sender's wallet

Send the signed transaction to kaia network

Recover the address from signed transaction using web3.klay.recoverFromTransaction

SignTxWithLegacyExample.js

const { Web3, toPeb } = require("@kaiachain/web3js-ext");

const senderAddr = "0xb2ba72e1f84b7b8cb15487a2bf20328f2cf40c25";

const senderPriv = "0xebceaca693ea3740231be94f38af6090d3aded336725d26a09b7d14e8e485e1e";

const receiverAddr = "0xc40b6909eb7085590e1c26cb3becc25368e249e9";

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);

async function main() {

let tx = {

from: senderAddr,

to: receiverAddr,

value: toPeb("0.01", "KLAY"),

};

const signResult = await senderAccount.signTransaction(tx);

console.log("signedTx", signResult.transactionHash);

const receipt = await web3.eth.sendSignedTransaction(signResult.rawTransaction);

console.log("receipt", receipt);

const sig = signResult.signature;

const addr2 = await web3.klay.recoverFromTransaction(senderAddr, sig, "latest");

console.log("recoveredAddr rpc", addr2, addr2.toLowerCase() === senderAddr);

}

main().catch(console.error);

output

❯ js SignTxWithLegacyExample.js

rawTx 0x08f87e05850ba43b740082cd1494c40b6909eb7085590e1c26cb3becc25368e249e98094b2ba72e1f84b7b8cb15487a2bf20328f2cf40c25f847f8458207f5a070d2c5f2dd52d6a3b7bba65594b2c875b8ce0473e16b06b43d5c2ec9ebfcd467a048af2fc51f75961a9cebfb1685b12d99db143bbd42a76f9c50970b807e1010b9

sentTx 0xecb117338d7a0e7e9444886ebdab5d0e14fd1b02fa476fee839a2fc3b105f391

receipt {

to: '0xC40B6909EB7085590E1c26Cb3beCC25368e249E9',

from: '0xb2ba72e1f84b7B8Cb15487A2bf20328F2cF40c25',

contractAddress: null,

transactionIndex: 1,

gasUsed: BigNumber { _hex: '0x5208', _isBigNumber: true },

logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',

blockHash: '0x7eae10aa2fcd3c42ac1705b63ad025f972a222bb71d65feeb0000d92c2e73732',

transactionHash: '0xecb117338d7a0e7e9444886ebdab5d0e14fd1b02fa476fee839a2fc3b105f391',

logs: [],

blockNumber: 152256170,

confirmations: 3,

cumulativeGasUsed: BigNumber { _hex: '0x029636', _isBigNumber: true },

effectiveGasPrice: BigNumber { _hex: '0x05d21dba00', _isBigNumber: true },

status: 1,

type: 0,

byzantium: true

}

recoveredAddr rpc 0xb2ba72e1f84b7b8cb15487a2bf20328f2cf40c25 true