multisig.js

const Caver = require('caver-js')
const caver = new Caver('https://api.baobab.klaytn.net:8651')

const originalKey = 'original_key';
const originalAccount = caver.klay.accounts.wallet.add(originalKey);
const address = originalAccount.address;
const acct1 = caver.klay.accounts.privateKeyToAccount('key1');
const acct2 = caver.klay.accounts.privateKeyToAccount('key2');
const acct3 = caver.klay.accounts.privateKeyToAccount('key3');

(async () => {
    // const privateKeyArray = [acct1.privateKey, acct2.privateKey, acct3.privateKey];
    // const multiSigOptions = { threshold: 2, weight: [1, 1, 1] };
    // const accountForUpdateForAccountKeyMultiSig = caver.klay.accounts.createAccountForUpdate(address, privateKeyArray, multiSigOptions);

    // const receipt = await caver.klay.sendTransaction({
    //     type: 'ACCOUNT_UPDATE',
    //     from: address,
    //     key: accountForUpdateForAccountKeyMultiSig,
    //     gas: 300000,
    // });
    // console.log(receipt);

    // Get account information
    await caver.klay.getAccount(address).then(console.log);

    // Value transfer using multisig
    const tx = {
        type: 'VALUE_TRANSFER',
        from: address,
        to: '0x5e47b195eeb11d72f5e1d27aebb6d341f1a9bedb',
        gas: '300000',
        value: caver.utils.toPeb('0.1', 'KLAY'),
    };

    // Sign the tx multiple times
    const { rawTransaction: toBeSigned } = await caver.klay.accounts.signTransaction(tx, acct1.privateKey);
    // Imagine a user holding acct1 signed the tx and pass the result (i.e., raw tx) to another user holding acct2
    const completelySigned = await caver.klay.accounts.signTransaction(toBeSigned, acct2.privateKey);

    const receipt = await caver.klay.sendSignedTransaction(completelySigned);
    console.log(receipt);
})();