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On this page
  • Summary
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  • Table of Contents
  • 1. Create a transaction to schedule
  • 2. Schedule the transfer transaction
  • 3. Submit Signatures
  • Submit one of the required signatures for the transfer transaction
  • Submit the second signature
  • 4. Verify the schedule was triggered
  • 5. Verify the scheduled transaction executed

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  1. Tutorials
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Schedule Your First Transaction

PreviousVirtual Environment SetupNextHow to Connect to Hedera Networks Over RPC

Last updated 4 months ago

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Summary

In this tutorial, you'll learn how to create and sign a scheduled transaction. Scheduled Transactions enable multiple parties to easily, inexpensively, and natively schedule and execute any type of Hedera transaction together. Once a transaction is scheduled, additional signatures can be submitted via a ScheduleSign transaction. After the last signature is received within the allotted timeframe, the scheduled transaction will execute.


Prerequisites

We recommend you complete the following introduction to get a basic understanding of Hedera transactions. This example does not build upon the previous examples.

  • Get a .

  • Set up your environment .


Table of Contents


1. Create a transaction to schedule

//Create a transaction to schedule
TransferTransaction transaction = new TransferTransaction()
     .addHbarTransfer(senderAccount, Hbar.fromTinybars(-1))
     .addHbarTransfer(recipientAccount, Hbar.fromTinybars(1));
//Create a transaction to schedule
const transaction = new TransferTransaction()
     .addHbarTransfer(senderAccount, Hbar.fromTinybars(-1))
     .addHbarTransfer(recipientAccount, Hbar.fromTinybars(1));
//Create a transaction to schedule
transaction := hedera.NewTransferTransaction().
     AddHbarTransfer(senderAccount, hedera.HbarFromTinybar(-1)).
     AddHbarTransfer(recipientAccount, hedera.HbarFromTinybar(1))
     

2. Schedule the transfer transaction

Next, you will schedule the transfer transaction by submitting a ScheduleCreate transaction to the network. Once the transfer transaction is scheduled, you can obtain the schedule ID from the receipt of the ScheduleCreate transaction. The schedule ID identifies the schedule that scheduled the transfer transaction. The schedule ID can be shared with the three signatories. The schedule is immutable unless the admin key is specified during creation.

The scheduled transaction ID of the transfer transaction can also be returned from the receipt of the ScheduleCreate transaction. You will notice that the transaction ID for a scheduled transaction includes a ?scheduled flag e.g. 0.0.9401@1620177544.531971543?scheduled. All transactions that have been scheduled will include this flag.

You can optionally add signatures you may have during the creation of the ScheduleCreate transaction by calling .freezeWith(client) and .sign() methods. This might make sense if you are one of the required signatures for the scheduled transaction.

Visit the page below to view additional properties that can be set when building a ScheduleCreate transaction.

//Schedule a transaction
TransactionResponse scheduleTransaction = new ScheduleCreateTransaction()
     .setScheduledTransaction(transaction)
     .execute(client);

//Get the receipt of the transaction
TransactionReceipt receipt = scheduleTransaction.getReceipt(client);
     
//Get the schedule ID
ScheduleId scheduleId = receipt.scheduleId;
System.out.println("The schedule ID is " +scheduleId);

//Get the scheduled transaction ID
TransactionId scheduledTxId = receipt.scheduledTransactionId;
System.out.println("The scheduled transaction ID is " +scheduledTxId);
//Schedule a transaction
const scheduleTransaction = await new ScheduleCreateTransaction()
     .setScheduledTransaction(transaction)
     .execute(client);

//Get the receipt of the transaction
const receipt = await scheduleTransaction.getReceipt(client);
     
//Get the schedule ID
const scheduleId = receipt.scheduleId;
console.log("The schedule ID is " +scheduleId);

//Get the scheduled transaction ID
const scheduledTxId = receipt.scheduledTransactionId;
console.log("The scheduled transaction ID is " +scheduledTxId);
//Schedule a transaction
scheduleTransaction, err := hedera.NewScheduleCreateTransaction().
		SetScheduledTransaction(transaction)
if err != nil {
	panic(err)
}

submitScheduleTx, err := scheduleTransaction.Execute(client)
if err != nil {
	panic(err)
}

//Get the receipt of the transaction
receipt, err := submitScheduleTx.GetReceipt(client)
if err != nil {
	panic(err)
}
	
//Get the schedule ID
scheduleId := receipt.ScheduleID
fmt.Printf("The schedule ID %v\n", scheduleId)

//Get the scheduled transaction ID
scheduleTxId := receipt1.ScheduledTransactionID
fmt.Printf("The scheduled transaction ID is %v\n", scheduleTxId)

3. Submit Signatures

Submit one of the required signatures for the transfer transaction

//Submit the first signatures
TransactionResponse signature1 = new ScheduleSignTransaction()
     .setScheduleId(scheduleId)
     .freezeWith(client)
     .sign(signerKey1)
     .execute(client);
     
//Verify the transaction was successful and submit a schedule info request
TransactionReceipt receipt1 = signature1.getReceipt(client);
System.out.println("The transaction status is " +receipt1.status);

ScheduleInfo query1 = new ScheduleInfoQuery()
     .setScheduleId(scheduleId)
     .execute(client);

//Confirm the signature was added to the schedule  
System.out.println(query1);
//Submit the first signature
const signature1 = await (await new ScheduleSignTransaction()
     .setScheduleId(scheduleId)
     .freezeWith(client)
     .sign(signerKey1))
     .execute(client);
     
//Verify the transaction was successful and submit a schedule info request
const receipt1 = await signature1.getReceipt(client);
console.log("The transaction status is " +receipt1.status.toString());

const query1 = await new ScheduleInfoQuery()
     .setScheduleId(scheduleId)
     .execute(client);

//Confirm the signature was added to the schedule   
console.log(query1);
//Submit the first signature
signature1, err := hedera.NewScheduleSignTransaction().
		SetScheduleID(scheduleId).
		FreezeWith(client)
if err != nil {
	panic(err)
}

//Verify the transaction was successful and submit a schedule info request
submitTx, err := signature1.Sign(signerKey1).Execute(client)
if err != nil {
	panic(err)
}

receipt1, err := submitTx.GetReceipt(client)
if err != nil {
	panic(err)
}

status := receipt1.Status

fmt.Printf("The transaction status is %v\n", status)

query1, err := hedera.NewScheduleInfoQuery().
	SetScheduleID(scheduleId).
	Execute(client)
	
//Confirm the signature was added to the schedule   
fmt.Print(query1)

Submit the second signature

Next, you will submit the second signature and verify the transaction was successful by requesting the receipt. For example purposes, you have access to all three signing keys. But the idea here is that each signer can independently submit their signature to the network.

Java
//Submit the second signature
TransactionResponse signature2 = new ScheduleSignTransaction()
     .setScheduleId(scheduleId)
     .freezeWith(client)
     .sign(signerKey2)
     .execute(client);
     
//Verify the transaction was successful
TransactionReceipt receipt2 = signature2.getReceipt(client);
System.out.println("The transaction status" +receipt2.status);
//Submit the second signature
const signature2 = await (await new ScheduleSignTransaction()
     .setScheduleId(scheduleId)
     .freezeWith(client)
     .sign(signerKey2))
     .execute(client);
     
//Verify the transaction was successful
const receipt2 = await signature2.getReceipt(client);
console.log("The transaction status " +receipt2.status.toString());
//Submit the second signature
signature2, err := hedera.NewScheduleSignTransaction().
		SetScheduleID(scheduleId).
		FreezeWith(client)
if err != nil {
	panic(err)
}

//Verify the transaction was successful and submit a schedule info request
submitTx2, err := signature2.Sign(signerKey2).Execute(client)
if err != nil {
	panic(err)
}

receipt2, err := submitTx2.GetReceipt(client)
if err != nil {
	panic(err)
}

status2 := receipt2.Status

fmt.Printf("The transaction status is %v\n", status2)

4. Verify the schedule was triggered

The schedule is triggered after it meets its minimum signing requirements. As soon as the last required signature is submitted, the schedule executes the scheduled transaction. To verify the schedule was triggered, query for the schedule info. When the schedule info is returned, you should notice both public keys that signed in the signatories field and the timestamp recorded for when the schedule transaction was executed in the executedAt field.

//Get the schedule info
ScheduleInfo query2 = new ScheduleInfoQuery()
    .setScheduleId(scheduleId)
    .execute(client);
    
System.out.println(query2);
//Get the schedule info
const query2 = await new ScheduleInfoQuery()
    .setScheduleId(scheduleId)
    .execute(client);
    
console.log(query2);
//Get the schedule info
query2, err := hedera.NewScheduleInfoQuery().
		SetScheduleID(scheduleId).
		Execute(client)

fmt.Print(query2)

5. Verify the scheduled transaction executed

//Get the scheduled transaction record
TransactionRecord scheduledTxRecord = TransactionId.fromString(scheduledTxId.toString()).getRecord(client);
System.out.println("The scheduled transaction record is: " +scheduledTxRecord);
//Get the scheduled transaction record
const scheduledTxRecord = await TransactionId.fromString(scheduledTxId.toString()).getRecord(client);
console.log("The scheduled transaction record is: " +scheduledTxRecord);
scheduledTxRecord, err := scheduledTransactionId.GetRecord(client)
fmt.Printf("The scheduled transaction record is %v\n", scheduledTxRecord)

First, you will need to build the transaction to schedule. In the example below, you will create a transfer transaction. The sender account has a structure that requires 2 out of the 3 keys to sign the transaction to authorize the transfer amount.

The signatures are submitted to the network via a transaction. The transaction requires the schedule ID of the schedule and the signature of one or more of the required keys. The scheduled transaction has 30 minutes from the time it is scheduled to receive all of its signatures; if the signature requirements are not met, the scheduled transaction will expire.

In the example below, you will submit one signature, confirm the transaction was successful, and get the to verify the signature was added to the schedule. To verify the signature was added, you can compare the public key of the submitted signature to the public key that is returned from the request.

When the scheduled transaction (transfer transaction) executes a record is produced that contains the transaction details. The scheduled transaction record can be requested immediately after the transaction has executed and includes the corresponding schedule ID. If you do not know when the scheduled transaction will execute, you can always query a using the scheduled transaction ID without the ?scheduled flag to get a copy of the transaction record.

Have a question?

threshold key
Create a schedule transaction
ScheduleSign
ScheduleSign
schedule info
schedule info
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Ask it on StackOverflow
Hedera testnet account
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Create Transaction
Schedule Transaction
Submit Signatures
Verify Schedule was Triggered
Verify Scheduled Transaction Executed