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 address and sender private key

Smart contract bytecode to deploy, you can retreive it from compiled solidity code

Set up the provider with the specified kairos testnet URL. A provider in web3js is a read-only abstraction to access the blockchain data.

Also, you can change the provider URL from kairos to quicknode

Create a KlaytnWeb3 instance using the provider

Convert the sender's private key to an account using web3.eth.accounts.privateKeyToAccount

Define a transaction object for the Cancel transaction

Set type: TxType.SmartContractDeploy for the transaction type of deploying contract

Set data: bytecode or input: bytecode for the source of the contract

Set params from, humanReadable, codeFormat as value in example

Sign the transaction with the sender's account

Send the signed transaction to the kaia network. It will return the transaction receipt

SmartContractDeploy.js


const { KlaytnWeb3, TxType } = require("@kaiachain/web3js-ext");
const { Web3 } = require("web3");
const senderAddr = "0xa2a8854b1802d8cd5de631e690817c253d6a9153";
const senderPriv = "0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8";
const bytecode = "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";
async function main() {
  const provider = new Web3.providers.HttpProvider("https://public-en-kairos.node.kaia.io");
  const web3 = new KlaytnWeb3(provider);
  const senderAccount = web3.eth.accounts.privateKeyToAccount(senderPriv);
  const tx = {
    type: TxType.SmartContractDeploy,
    from: senderAddr,
    data: bytecode, // both 'data' and 'input' works
    humanReadable: false, // must be false
    codeFormat: 0, // must be 0
  };
  const signResult = await senderAccount.signTransaction(tx);
  console.log("rawTx", signResult.rawTransaction);
  const receipt = await web3.eth.sendSignedTransaction(signResult.rawTransaction);
  console.log("receipt", receipt);
}
main();

output


❯ js SmartContractDeploy.js
signedTx 0x07b3209f1e56484f9a61885b25ddb398668b6d423ca98fea5004f1a1b87d1532
receipt {
  blockHash: '0x8a5cde9fd5b5f8dba974b4d5207cdb728a7e07cc9f595ef8e6284f1681a45e8b',
  blockNumber: 148742566n,
  contractAddress: '0xbb1e6520d31d7d046e993a436e0f9c054ac37efb',
  cumulativeGasUsed: 130317n,
  effectiveGasPrice: 25000000000n,
  from: '0xa2a8854b1802d8cd5de631e690817c253d6a9153',
  gasUsed: 130317n,
  logs: [],
  logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
  status: 1n,
  transactionHash: '0x07b3209f1e56484f9a61885b25ddb398668b6d423ca98fea5004f1a1b87d1532',
  transactionIndex: 0n,
  type: 0n
}