Sending a Simulated Transaction

After simulating a transaction and ensuring it behaves as expected, the next step is to send the transaction on the OP_NET network. This guide explains how to build and send a transaction based on simulation results using the sendTransaction method.

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Method

sendTransaction(interactionParams: TransactionParameters): Promise<InteractionTransactionReceipt>;

• Parameters:

  • interactionParams: TransactionParameters: The parameters required to send the transaction.

• Returns:

  • Promise<InteractionTransactionReceipt>: An object containing details about the submitted transaction.

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Object Definitions

TransactionParameters Object

Field	Type	Description
signer	Signer | ECPairInterface	Signer to authorize the transaction.
refundTo	string	Address to refund unused satoshis.
priorityFee	bigint	(Optional) Fee for prioritizing the transaction.
feeRate	number	(Optional) Fee rate in satoshis per byte.
utxos	UTXO[]	(Optional) UTXOs to fund the transaction.
maximumAllowedSatToSpend	bigint	Max satoshis allowed to spend.
network	Network	The Bitcoin network (e.g., regtest, mainnet).

InteractionTransactionReceipt Object

Field	Type	Description
transactionId	string	The ID of the transaction on the network.
newUTXOs	UTXO[]	Newly created UTXOs from the transaction.
peerAcknowledgements	number	Number of peers that acknowledged the transaction.

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Sending the Transaction

Once you have the simulation result, you can call the sendTransaction method directly on the simulation object. Here’s a conceptual explanation:

1. Simulate the Transaction: Obtain the simulation result from a contract interaction. For example:

   const result = await op20Contract.approve(addressPublicKey, 1000n); // Simulate an `approve` transaction

2. Signer Setup: Use the Wallet.fromWif for example, to create a signer object:

   const wallet = Wallet.fromWif("your-wif-key", networks.regtest); // Replace with your actual WIF
   const signer = wallet.keypair;

3. Call sendTransaction: Using the simulation object, pass the necessary parameters to sendTransaction:

   const receipt = await result.sendTransaction({
     signer: signer,
     refundTo: "bcrt1...address", // Replace with your refund address
     feeRate: 100, // Optional: Fee rate in satoshis per byte
     priorityFee: 300n, // Optional: Priority fee in satoshis
     maximumAllowedSatToSpend: 100_000n, // Maximum satoshis to spend
     network: networks.regtest, // Network configuration
   });