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Legacy Account Key

AccountKeyLegacy

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

Create a credentials from private key

Create a Web3j instance with the specified BAOBAB_URL

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

Gas price and gas limit settings

Get chain ID from the network

Get the nonce for the sender's address

Generate a new account key for account update

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

AccountUpdateWithLegacyExample.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 org.web3j.crypto.KlayCredentials;

import org.web3j.crypto.KlayRawTransaction;

import org.web3j.crypto.KlayTransactionEncoder;

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

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 AccountUpdateWithLegacyExample {

public static void run() throws Exception {

KlayCredentials credentials = KlayCredentials.create(keySample.LEGACY_KEY_privkey);

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

BigInteger GAS_PRICE = BigInteger.valueOf(50000000000L);

BigInteger GAS_LIMIT = BigInteger.valueOf(6721950);

String from = credentials.getAddress();

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

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

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

.getTransactionCount();

AccountKeyLegacy accountkey = AccountKeyLegacy.create();

TxType.Type type = Type.ACCOUNT_UPDATE;

KlayRawTransaction raw = KlayRawTransaction.createTransaction(

type,

nonce,

GAS_PRICE,

GAS_LIMIT,

from,

accountkey);

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

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 AccountUpdateWithLegacyExample.java

TxHash :

0x7b435e127119d8ee2edf8d49377ed150e4579cc3c991e0272a519a5d7f3f17b2

Receipt from eth_getTransactionReceipt :

TransactionReceipt{transactionHash='0x7b435e127119d8ee2edf8d49377ed150e4579cc3c991e0272a519a5d7f3f17b2', transactionIndex='0x1', blockHash='0xc1d491e001410664e0a1e68c20d69890a587dede6beae43c20fa1899935425ba', blockNumber='0x90e59b5', cumulativeGasUsed='0x3240d', gasUsed='0x5208', contractAddress='null', root='null', status='0x1', from='0xa2a8854b1802d8cd5de631e690817c253d6a9153', to='0xa2a8854b1802d8cd5de631e690817c253d6a9153', logs=[], logsBloom='0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000', revertReason='null', type='0x0', effectiveGasPrice='0x5d21dba00'}

Receipt from klay_getTransactionReceipt :

class TransactionReceipt {

blockHash: 0xc1d491e001410664e0a1e68c20d69890a587dede6beae43c20fa1899935425ba

blockNumber: 0x90e59b5

codeFormat: null

contractAddress: null

feePayer: null

feePayerSignatures: []

feeRatio: null

from: 0xa2a8854b1802d8cd5de631e690817c253d6a9153

gas: 0x66919e

effectiveGasPrice: 0x5d21dba00

gasPrice: 0xba43b7400

gasUsed: 0x5208

humanReadable: null

key: 0x01c0

input: null

logs: []

logsBloom: 0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

nonce: 0x3e8

senderTxHash: 0x7b435e127119d8ee2edf8d49377ed150e4579cc3c991e0272a519a5d7f3f17b2

signature: []

status: 0x1

txError: null

to: null

transactionHash: 0x7b435e127119d8ee2edf8d49377ed150e4579cc3c991e0272a519a5d7f3f17b2

transactionIndex: 0x1

type: TxTypeAccountUpdate

typeInt: 32

value: null

}

TxType : ACCOUNT_UPDATE