Public Account Key

AccountKeyPublic is used for accounts having one public key. If an account has an AccountKeyPublic object, the transaction validation process is done like below:

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

Define sender's address and private key

Set up the provider with the specified kairos testnet URL. A provider in ethers 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 and provider

Define a message to be signed and recovered

Sign the message with sender's wallet

Recover the address from signed message using ethers.utils.verifyMessage

Recover the address from signed message using klay_recoverFromMessage

SignMsgWithPubkeyExample.js

const { ethers } = require("ethers");

const { Wallet } = require("@kaiachain/ethers-ext/v5");

const senderAddr = "0xe15cd70a41dfb05e7214004d7d054801b2a2f06b";

const senderPriv = "0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8";

const provider = new ethers.providers.JsonRpcProvider("https://public-en-kairos.node.kaia.io");

const wallet = new Wallet(senderAddr, senderPriv, provider); // decoupled account

async function main() {

const msg = "hello";

const msghex = ethers.utils.hexlify(ethers.utils.toUtf8Bytes(msg));

const sig = await wallet.signMessage(msg);

console.log({ senderAddr, msg, msghex, sig });

const addr1 = ethers.utils.verifyMessage(msg, sig);

console.log("recoveredAddr lib", addr1, addr1.toLowerCase() === wallet.address.toLowerCase());

const addr2 = await provider.send("klay_recoverFromMessage", [senderAddr, msghex, sig, "latest"]);

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

}

main().catch(console.error);

output

❯ js SignMsgWithPubkeyExample.js

{

senderAddr: '0xe15cd70a41dfb05e7214004d7d054801b2a2f06b',

msg: 'hello',

msghex: '0x68656c6c6f',

sig: '0xed55b92b3db953c4b4d928c99f93275d2590fe2ec95f2d8c069068d86d43ce0c0d1206f297351c6a0dfaba9c24d1a2ac293ac8f8a73d16c2b0c39ce90bc36ab71b'

}

recoveredAddr lib 0xA2a8854b1802D8Cd5De631E690817c253d6a9153 true

recoveredAddr rpc 0xa2a8854b1802d8cd5de631e690817c253d6a9153 true