send multiple transaction at once and wait for them to be mined

README.md

run script

npx hardhat run scripts/hardhat-send-multiple-txs.ts --network goerli

result

Sending funds
Tx sent: nonce: 11 | hash: 0xcc25e7c4ea0aec0726f28ae0bbdfd438cbcb9a78b4571610219171b500533ea8
Tx sent: nonce: 12 | hash: 0x5851f016b17772c479df1adb98406a1b3bb7a8f44f6418aec9b5d7c0895217ff
Tx confirmed: hash: 0x5851f016b17772c479df1adb98406a1b3bb7a8f44f6418aec9b5d7c0895217ff
Tx confirmed: hash: 0xcc25e7c4ea0aec0726f28ae0bbdfd438cbcb9a78b4571610219171b500533ea8

hardhat-send-multiple-txs.ts

import { TransactionResponse } from "@ethersproject/providers";
import { Signer } from "ethers";
import { ethers } from "hardhat";

/*
  const nonce0 = await signer.getTransactionCount();
  
  await Promise.all(argsArray.map(
    async (args: Type, index: number) => {
      // TODO: send transaction here with nonce = nonce0 + index
      
    }
  ));
*/

async function sendFunds(signer: Signer, receivers: string[]) {
  console.log("Sending funds");
  const nonce0 = await signer.getTransactionCount();
  
  // send multiple transactions
  await Promise.all(receivers.map(
    async (receiver: string, index: number) => {
      // create transaction
      // const tx: TransactionResponse = await contract.method(args, {nonce: nonce0 + index});
      const tx: TransactionResponse = await signer.sendTransaction({
        to: receiver,
        value: ethers.utils.parseEther("0.1"),
        nonce: nonce0 + index,
      });
      console.log(`Tx sent: nonce: ${tx.nonce} | hash: ${tx.hash}`);
      
      // wait for confirmation
      const minedTx = await tx.wait()
      console.log(`Tx confirmed: hash: ${minedTx.transactionHash}`);    
    }
  ));
}

async function main() {
  const signers = await ethers.getSigners()

  // the 2nd account will send the 1st and the 3rd accounts 0.1 ETH
  await sendFunds(signers[1], [
    signers[0].address,
    signers[2].address
  ]);
  
}

// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});