Submit Signature

Summary:

This script signs a scheduled transaction on the Hedera network using a specified private key. It demonstrates how to use the ScheduleSignTransaction to create a transaction for signing a scheduled transaction, sign it with a specified private key, execute it on the Hedera network, and retrieve the transaction status to confirm the signing operation.

Step 1: Imports and Environment Setup

const {
    ScheduleSignTransaction,
    Client,
    PrivateKey,
    ScheduleInfoQuery
} = require("@hashgraph/sdk");
require('dotenv').config({ path: 'Scheduled_TX/.env' });

• The script imports necessary modules from the Hedera JavaScript SDK (@hashgraph/sdk): ScheduleSignTransaction, Client, PrivateKey, and ScheduleInfoQuery.

• It also imports the dotenv module to load environment variables from a .env file located in the Scheduled_TX directory.

Step 2: Environment Variables Retrieval and Validation

const myAccountId = process.env.MY_ACCOUNT_ID;
const myPrivateKey = PrivateKey.fromString(process.env.MY_PRIVATE_KEY);

const otherAccountId = process.env.OTHER_ACCOUNT_ID;
const otherPrivateKey = PrivateKey.fromString(process.env.OTHER_PRIVATE_KEY);

const scheduleId = process.env.SCHEDULE_ID;

if (myAccountId == null ||
    myPrivateKey == null ) {
    throw new Error("Environment variables myAccountId and myPrivateKey must be present");
}

• The code retrieves necessary environment variables such as account IDs and private keys from the .env file.

• It validates that the required environment variables (MY_ACCOUNT_ID and MY_PRIVATE_KEY) are present. If not, it throws an error.

Step 3: Client Setup

const client = Client.forTestnet();
client.setOperator(myAccountId, myPrivateKey);

• It creates a client instance for the Hedera testnet and sets the operator account using the user's account ID and private key.

Step 4: Main Function

async function main() {
    const transaction = await new ScheduleSignTransaction()
        .setScheduleId(scheduleId)
        .freezeWith(client)
        .sign(otherPrivateKey);

    const txResponse = await transaction.execute(client);

    const receipt = await txResponse.getReceipt(client);

    const transactionStatus = receipt.status;
    console.log("The transaction consensus status is " +transactionStatus);

    process.exit();
}

• This is the main function named main().

• It creates a ScheduleSignTransaction instance to sign the scheduled transaction using the provided schedule ID and the specified private key (otherPrivateKey).

• The transaction is frozen with the client, signed with the specified private key (otherPrivateKey), and executed using the client.

• The script then retrieves the receipt of the transaction to obtain its status, which indicates the consensus status of the signing operation.

• The transaction consensus status is logged to the console.

Step 5: Execution

main();

• This line calls the main() function to start the execution of the script.