Smart Contract Deploy

TxTypeSmartContractDeploy deploys a smart contract to the given address. The following changes will be made by this transaction type.

Import the web3 and @kaiachain/web3js-ext packages to add kaia features on web3

Define sender, fee payer addresses and private keys

Set up the provider with the specified kaia Baobab testnet URL. A provider in web3 is a read-only abstraction to access the blockchain data.

Also, you can change the provider URL from baobab to allthatnode

Create a sender's wallet with the private key using web3.eth.accounts.privateKeyToAccount

Create a fee payer's wallet with the private key using web3.eth.accounts.privateKeyToAccount

Define a transaction object

Set type: TxType.FeeDelegatedSmartContractDeploy for transaction to deploy a new contract with a fee payer

Set data: "0x60806040... is the bytecode of the compile solidity source code

Set others required parameters such as senderAddr, humanReadable, codeFormat

Sign the transaction with sender account using signTransaction

Sign the transaction with fee payer account using signTransactionAsFeePayer

Send the transaction to blockchain. It will return the transaction receipt

FeeDelegatedSmartContractDeployExample.js

const { Web3, TxType } = require("@kaiachain/web3js-ext");

const senderAddr = "0xa2a8854b1802d8cd5de631e690817c253d6a9153";

const senderPriv = "0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8";

const feePayerAddr = "0xcb0eb737dfda52756495a5e08a9b37aab3b271da";

const feePayerPriv = "0x9435261ed483b6efa3886d6ad9f64c12078a0e28d8d80715c773e16fc000cff4";

const provider = new Web3.providers.HttpProvider("https://public-en-kairos.node.kaia.io");

const web3 = new Web3(provider);

const senderAccount = web3.eth.accounts.privateKeyToAccount(senderPriv);

const feePayerAccount = web3.eth.accounts.privateKeyToAccount(feePayerPriv);

async function main() {

const tx = {

type: TxType.FeeDelegatedSmartContractDeploy,

from: senderAddr,

data: "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",

humanReadable: false, // must be false

codeFormat: 0, // must be 0

};

// Sign transaction by sender

const signResult1 = await senderAccount.signTransaction(tx);

console.log("senderTxHashRLP", signResult1.rawTransaction);

// Sign and send transaction by fee payer

const signResult2 = await feePayerAccount.signTransactionAsFeePayer(signResult1.rawTransaction);

console.log("signedTx", signResult2.transactionHash);

const receipt = await web3.eth.sendSignedTransaction(signResult2.rawTransaction);

console.log("receipt", receipt);

}

main();

output

❯ node FeeDelegatedSmartContractDeployExample.js

senderTxHashRLP 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

signedTx 0x57cf3bfddf3e72effc39e80b9cb6995273822e51d50f55da93a14574b5dae9d1

receipt {

blockHash: '0x84f6aefd1ee6425e03cd8571fbfb653cf5971c729e7b3864456bb36bfd212622',

blockNumber: 148744885n,

contractAddress: '0x661c557c1b7c2b1fbd6c4793d210cd1e421064e9',

cumulativeGasUsed: 333958n,

effectiveGasPrice: 25000000000n,

from: '0xa2a8854b1802d8cd5de631e690817c253d6a9153',

gasUsed: 140317n,

logs: [],

logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',

status: 1n,

transactionHash: '0x57cf3bfddf3e72effc39e80b9cb6995273822e51d50f55da93a14574b5dae9d1',

transactionIndex: 1n,

type: 0n

}