Multisig Account Key

AccountKeyWeightedMultiSig is an account key type containing a threshold and WeightedPublicKeys which contains a list consisting of a public key and its weight.

In order for a transaction to be valid for an account associated with AccountKeyWeightedMultiSig, the following conditions should be satisfied: _ The weighted sum of the signed public keys should be larger than the threshold. _ The invalid signature should not be included in the transaction. * The number of signed public keys should be less than the number of weightedPublicKeys.

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

Define sender's address and private key and all weighted multi-sig private keys

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 3 wallets with the weight multi-sig private keys and provider

Define a message to be signed and recovered

Sign the message with sender's wallet3

Recover the address from signed message using ethers.verifyMessage

Recover the address from signed message using klay_recoverFromMessage

SignMsgWithMultiSigExample.js

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

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

const senderAddr = "0x82c6a8d94993d49cfd0c1d30f0f8caa65782cc7e";

const senderPriv = "0xa32c30608667d43be2d652bede413f12a649dd1be93440878e7f712d51a6768a";

const senderNewPriv1 = "0xa32c30608667d43be2d652bede413f12a649dd1be93440878e7f712d51a6768a";

const senderNewPriv2 = "0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8";

const senderNewPriv3 = "0xc9668ccd35fc20587aa37a48838b48ccc13cf14dd74c8999dd6a480212d5f7ac";

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

const wallet1 = new Wallet(senderAddr, senderNewPriv1, provider);

const wallet2 = new Wallet(senderAddr, senderNewPriv2, provider);

const wallet3 = new Wallet(senderAddr, senderNewPriv3, provider);

async function main() {

const msg = "hello";

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

const sig = await wallet3.signMessage(msg);

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

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

console.log("recoveredAddr lib", addr1, addr1.toLowerCase() === wallet3.address.toLowerCase());

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

console.log("recoveredAddr rpc", addr2, addr2.toLowerCase() === wallet3.address.toLowerCase());

}

main().catch(console.error);

output

❯ js SignMsgWithMultiSigExample.js

{

senderAddr: '0x82c6a8d94993d49cfd0c1d30f0f8caa65782cc7e',

msg: 'hello',

msghex: '0x68656c6c6f',

sig: '0x4bb3156dfd3349b974222b9ed754a3835802d920b63e8c07f41a75a174ce99d92a70d62e7a4b30d18599de61a882c59c0fd726883e3ce9955f8d5f60ce5b65211c'

}

recoveredAddr lib 0xe15Cd70A41dfb05e7214004d7D054801b2a2f06b true

recoveredAddr rpc 0xe15cd70a41dfb05e7214004d7d054801b2a2f06b true