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 necessary classes from the Web3j and kaia libraries(web3j-ext).

Create a Web3j instance with the specified BAOBAB_URL

Also, you can change the default provider. For example, using the alchemy provider.

Create 3 different credentials from private keys

Gas price and gas limit settings

Get chain ID from the network

Get the nonce for the sender's address

Generate new account keys and theirs weights for account update

Combine generated weighted account keys into a list

Set transaction type as ACCOUNT_UPDATE

Create a raw transaction for account update

Sign the transaction

Send the signed transaction to kaia network

Wait for the transaction to be completed and get the transaction receipt

Shut down the Web3j instance

Decode the raw transaction to get the transaction type

AccountUpdateWithMultiSigExample.java

package org.web3j.example.accountKey;

import org.web3j.tx.response.PollingTransactionReceiptProcessor;

import org.web3j.tx.response.TransactionReceiptProcessor;

import org.web3j.example.keySample;

import java.io.IOException;

import java.math.BigInteger;

import java.util.List;

import org.web3j.crypto.KlayCredentials;

import org.web3j.crypto.KlayRawTransaction;

import org.web3j.crypto.KlayTransactionEncoder;

import org.web3j.crypto.transaction.account.AccountKeyPublic;

import org.web3j.crypto.transaction.account.AccountKeyWeightedMultiSig;

import org.web3j.crypto.transaction.account.AccountKeyWeightedMultiSig.WeightedPublicKey;

import org.web3j.crypto.transaction.type.TxType;

import org.web3j.crypto.transaction.type.TxTypeAccountUpdate;

import org.web3j.crypto.transaction.type.TxType.Type;

import org.web3j.protocol.core.DefaultBlockParameterName;

import org.web3j.protocol.core.methods.response.EthChainId;

import org.web3j.protocol.core.methods.response.EthSendTransaction;

import org.web3j.protocol.kaia.Web3j;

import org.web3j.protocol.http.HttpService;

import org.web3j.utils.Numeric;

import org.web3j.protocol.kaia.core.method.response.TransactionReceipt;

public class AccountUpdateWithMultiSigExample {

public static void run() throws Exception {

Web3j web3j = Web3j.build(new HttpService(keySample.BAOBAB_URL));

KlayCredentials credential1 = KlayCredentials.create(keySample.MULTI_KEY_privkey1, keySample.MULTI_KEY_address);

KlayCredentials credential2 = KlayCredentials.create(keySample.MULTI_KEY_privkey2, keySample.MULTI_KEY_address);

KlayCredentials credential3 = KlayCredentials.create(keySample.MULTI_KEY_privkey3, keySample.MULTI_KEY_address);

BigInteger GAS_PRICE = BigInteger.valueOf(50000000000L);

BigInteger GAS_LIMIT = BigInteger.valueOf(6721950);

String from = credential1.getAddress();

EthChainId EthchainId = web3j.ethChainId().send();

long chainId = EthchainId.getChainId().longValue();

BigInteger nonce = web3j.ethGetTransactionCount(from, DefaultBlockParameterName.LATEST).send()

.getTransactionCount();

BigInteger newPubkey1 = credential1.getEcKeyPair().getPublicKey();

WeightedPublicKey weightedAccountKey1 = WeightedPublicKey.create(BigInteger.ONE,

AccountKeyPublic.create(newPubkey1));

BigInteger newPubkey2 = credential2.getEcKeyPair().getPublicKey();

WeightedPublicKey weightedAccountKey2 = WeightedPublicKey.create(BigInteger.ONE,

AccountKeyPublic.create(newPubkey2));

BigInteger newPubkey3 = credential3.getEcKeyPair().getPublicKey();

WeightedPublicKey weightedAccountKey3 = WeightedPublicKey.create(BigInteger.ONE,

AccountKeyPublic.create(newPubkey3));

// make list with weightedAccountKey1, weightedAccountKey2, weightedAccountKey3

List<WeightedPublicKey> weightedAccountKeyList = List.of(weightedAccountKey1, weightedAccountKey2,

weightedAccountKey3);

AccountKeyWeightedMultiSig accountkey = AccountKeyWeightedMultiSig.create(BigInteger.TWO,

weightedAccountKeyList);

TxType.Type type = Type.ACCOUNT_UPDATE;

KlayRawTransaction raw = KlayRawTransaction.createTransaction(

type,

nonce,

GAS_PRICE,

GAS_LIMIT,

from,

accountkey);

byte[] signedMessage = KlayTransactionEncoder.signMessage(raw, chainId, credential1);

signedMessage = KlayTransactionEncoder.signMessage(raw, chainId, credential2);

String hexValue = Numeric.toHexString(signedMessage);

EthSendTransaction transactionResponse = web3j.ethSendRawTransaction(hexValue).send();

System.out.println("TxHash : \n " + transactionResponse.getResult());

String txHash = transactionResponse.getResult();

int DEFAULT_POLLING_ATTEMPTS_PER_TX_HASH = 40;

int DEFAULT_BLOCK_TIME = 1 * 1000;

long DEFAULT_POLLING_FREQUENCY = DEFAULT_BLOCK_TIME;

TransactionReceiptProcessor transactionReceiptProcessor = new PollingTransactionReceiptProcessor(web3j,

DEFAULT_POLLING_FREQUENCY, DEFAULT_POLLING_ATTEMPTS_PER_TX_HASH);

org.web3j.protocol.core.methods.response.TransactionReceipt ethReceipt = transactionReceiptProcessor

.waitForTransactionReceipt(txHash);

System.out.println("Receipt from eth_getTransactionReceipt : \n" + ethReceipt);

TransactionReceipt receipt = web3j.klayGetTransactionReceipt(txHash).send().getResult();

System.out.println("Receipt from klay_getTransactionReceipt : \n" + receipt);

web3j.shutdown();

TxTypeAccountUpdate rawTransaction = TxTypeAccountUpdate.decodeFromRawTransaction(signedMessage);

System.out.println("TxType : " + rawTransaction.getKlayType());

}

}

output

❯ java AccountUpdateWithMultiSigExample.java

TxHash :

0xfffe87a710a452a8457f80a8a5bdce48e2e50cac53663dbc72cfc104926fd442

Receipt from eth_getTransactionReceipt :

TransactionReceipt{transactionHash='0xfffe87a710a452a8457f80a8a5bdce48e2e50cac53663dbc72cfc104926fd442', transactionIndex='0x3', blockHash='0x4e8c4f1b795ca48c9a60788786481b72df1e2eb16d83ffc9d89e1e2708962378', blockNumber='0x90e5807', cumulativeGasUsed='0x983cc', gasUsed='0x17700', contractAddress='null', root='null', status='0x1', from='0x82c6a8d94993d49cfd0c1d30f0f8caa65782cc7e', to='0x82c6a8d94993d49cfd0c1d30f0f8caa65782cc7e', logs=[], logsBloom='0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000', revertReason='null', type='0x0', effectiveGasPrice='0x5d21dba00'}

Receipt from klay_getTransactionReceipt :

class TransactionReceipt {

blockHash: 0x4e8c4f1b795ca48c9a60788786481b72df1e2eb16d83ffc9d89e1e2708962378

blockNumber: 0x90e5807

codeFormat: null

contractAddress: null

feePayer: null

feePayerSignatures: []

feeRatio: null

from: 0x82c6a8d94993d49cfd0c1d30f0f8caa65782cc7e

gas: 0x66919e

effectiveGasPrice: 0x5d21dba00

gasPrice: 0xba43b7400

gasUsed: 0x17700

humanReadable: null

key: 0x04f86f02f86ce301a1021473839f05083617d532325ce8aa40edffb2bc79f1ce17c77cc41f92f027dd82e301a103dc9dccbd788c00fa98f7f4082f2f714e799bc0c29d63f04d48b54fe6250453cde301a103f26489914098c5da51f0f646e3000da4d6197217df082b4f7ce1530f0a0cbf2a

input: null

logs: []

logsBloom: 0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

nonce: 0x73

senderTxHash: 0xfffe87a710a452a8457f80a8a5bdce48e2e50cac53663dbc72cfc104926fd442

signature: []

status: 0x1

txError: null

to: null

transactionHash: 0xfffe87a710a452a8457f80a8a5bdce48e2e50cac53663dbc72cfc104926fd442

transactionIndex: 0x3

type: TxTypeAccountUpdate

typeInt: 32

value: null

}

TxType : ACCOUNT_UPDATE