This page uses machine translation from English, which may contain errors or unclear language. For the most accurate information, please see the original English version. Some content may be in the original English due to frequent updates. Help us improve this page's translation by joining our effort on Crowdin. (Crowdin translation page, Contributing guide)

Legacy Account Key

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

SignMsgWithLegacyExample.js

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

const { Wallet } = require("@kaiachain/ethers-ext/v6");

const senderAddr = "0x24e8efd18d65bcb6b3ba15a4698c0b0d69d13ff7";

const senderPriv = "0x4a72b3d09c3d5e28e8652e0111f9c4ce252e8299aad95bb219a38eb0a3f4da49";

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

const wallet = new Wallet(senderPriv, provider);

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() === senderAddr);

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

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

}

main().catch(console.error);

output

❯ js SignMsgWithLegacyExample.js

{

senderAddr: '0x24e8efd18d65bcb6b3ba15a4698c0b0d69d13ff7',

msg: 'hello',

msghex: '0x68656c6c6f',

sig: '0xcf6792ecd73ccc5efc1612f461bffa699e824a4ed64ec1073709c9d6b8c6daf608060326371544811e2015398f7e48ad839e1f3c551e8cb7c3c82f10d226bd671b'

}

recoveredAddr lib 0x24e8eFD18D65bCb6b3Ba15a4698c0b0d69d13fF7 true

recoveredAddr rpc 0x24e8efd18d65bcb6b3ba15a4698c0b0d69d13ff7 true