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Sign and Broadcast Tx

The code example uses ethers.js 6.10.0. To sign and broadcast a transaction to the Ethereum network, follow these steps:

Retrieve unsigned serialized transactions in Base64 encrypted format.

Sign and broadcast the transaction using the following code:

require("dotenv").config();
const { ethers } = require('ethers');

async function signAndBroadcast() {
console.log("Started");

// Enter the serialized transaction
const rawTransaction = process.env.RAW_TRANSACTION;

// Enter the private key of the address used to transfer the stake amount
const privateKey = process.env.PRIVATE_KEY;

// Enter the selected RPC URL
const rpcURL = process.env.RPC_URL;

// Initialize the provider using the RPC URL
const provider = new ethers.JsonRpcProvider(rpcURL);

// Initialize a new Wallet instance
const wallet = new ethers.Wallet(privateKey, provider);

// Parse the raw transaction
const tx = ethers.Transaction.from(rawTransaction);

const newTx = {
to: tx.to,
data: tx.data,
chainId: tx.chainId,
value: tx.value,
gasLimit: tx.gasLimit,
type: 2,

nonce: await provider.getTransactionCount(wallet.address),
// Enter the max fee per gas and prirorty fee
maxFeePerGas: ethers.parseUnits(process.env.MAX_FEE_PER_GAS_IN_GWEI, 'gwei'),
maxPriorityFeePerGas: ethers.parseUnits(process.env.MAX_PRIORITY_FEE_IN_GWEI, 'gwei')
}

// Sign the transaction
const signedTransaction = await wallet.signTransaction(newTx);

// Send the signed transaction
const transactionResponse = await provider.broadcastTransaction(signedTransaction);

return transactionResponse;
}

signAndBroadcast()
.then((transactionResponse) => {
console.log(
"Transaction broadcasted, transaction hash:",
transactionResponse.hash
);
})
.catch((error) => {
console.error("Error:", error);
})
.finally(() => {
console.log("Finished");
});