Deploy Smart Contracts on Hedera Using Truffle

async function main() {
  // Generate ECDSA key pair
  console.log("- Generating a new key pair... \n");
  const newPrivateKey = PrivateKey.generateECDSA();
  const newPublicKey = newPrivateKey.publicKey;
  const newAliasAccountId = newPublicKey.toAccountId(0, 0);

  console.log(`- New account alias: ${newAliasAccountId} \n`);
  console.log(`- New private key (Hedera): ${newPrivateKey} \n`);
  console.log(`- New public key (Hedera): ${newPublicKey} \n`);
  console.log(
    `- New private key (RAW EVM): 0x${newPrivateKey.toStringRaw()} \n`
  );
  console.log(`- New public key (RAW): 0x${newPublicKey.toStringRaw()} \n`);
  console.log(
    `- New public key (EVM): 0x${newPublicKey.toEthereumAddress()} \n\n`
  );

  // Transfer HBAR to newAliasAccountId to auto-create the new account
  // Get account information from a transaction record query
  const [txReceipt, txRecQuery] = await autoCreateAccountFcn(
    operatorId,
    newAliasAccountId,
    100
  );
  console.log(`- HBAR Transfer to new account: ${txReceipt.status} \n\n`);
  console.log(`- Parent transaction ID: ${txRecQuery.transactionId} \n`);
  console.log(
    `- Child transaction ID: ${txRecQuery.children[0].transactionId.toString()} \n`
  );
  console.log(
    `- New account ID (from RECORD query): ${txRecQuery.children[0].receipt.accountId.toString()} \n`
  );

  // Get account information from a mirror node query
  const mirrorQueryResult = await mirrorQueryFcn(newPublicKey);
  console.log(
    `- New account ID (from MIRROR query): ${mirrorQueryResult.data?.accounts[0].account} \n`
  );
}

async function autoCreateAccountFcn(
  senderAccountId,
  receiverAccountId,
  hbarAmount
) {
  //Transfer hbar to the account alias to auto-create account
  const transferToAliasTx = new TransferTransaction()
    .addHbarTransfer(senderAccountId, new Hbar(-hbarAmount))
    .addHbarTransfer(receiverAccountId, new Hbar(hbarAmount))
    .freezeWith(client);
  const transferToAliasSign = await transferToAliasTx.sign(operatorKey);
  const transferToAliasSubmit = await transferToAliasSign.execute(client);
  const transferToAliasRx = await transferToAliasSubmit.getReceipt(client);

  // Get a transaction record and query the record to get information about the account creation
  const transferToAliasRec = await transferToAliasSubmit.getRecord(client);
  const txRecordQuery = await new TransactionRecordQuery()
    .setTransactionId(transferToAliasRec.transactionId)
    .setIncludeChildren(true)
    .execute(client);
  return [transferToAliasRx, txRecordQuery];
}

async function mirrorQueryFcn(publicKey) {
  // Query a mirror node for information about the account creation
  await delay(10000); // Wait for 10 seconds before querying account id
  const mirrorNodeUrl = "https://testnet.mirrornode.hedera.com/api/v1/";
  const mQuery = await axios.get(
    mirrorNodeUrl + "accounts?account.publickey=" + publicKey.toStringRaw()
  );
  return mQuery;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.9.0;

contract SimpleStorage {
   uint256 data;

   function getData() external view returns (uint256) {
       return data;
   }

   function setData(uint256 _data) external {
       data = _data;
   }
}

truffle compile

NETWORK_ID = 296
JSON_RPC_RELAY_URL = https://testnet.hashio.io/api
ETH_PRIVATE_KEY = 0x7a9e... [Run create-account.js and paste value of “New private key (RAW EVM)”]

truffle migrate