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Public Account Key

AccountKeyPublic is used for accounts having one public key. AccountKeyPublic은 공개 키가 하나뿐인 계정에 사용됩니다.
계정에 AccountKeyPublic 객체가 있는 경우 트랜잭션 유효성 검사 프로세스는 아래와 같이 수행됩니다:

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.verifyMessage

Recover the address from signed message using klay_recoverFromMessage

SignMsgWithPubkeyExample.js

const { ethers } = require("ethers");
const { Wallet } = require("@kaiachain/ethers-ext/v6");
const senderAddr = "0xe15cd70a41dfb05e7214004d7d054801b2a2f06b";
const senderPriv = "0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8";
const provider = new ethers.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.hexlify(ethers.toUtf8Bytes(msg));
const sig = await wallet.signMessage(msg);
console.log({ senderAddr, msg, msghex, sig });
const addr1 = ethers.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

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