Here is an article that explains how to send a “RawTransaction” in JSON-RPC format using the Bitcoin Core package in Node.js:

Sending Raw Transactions in JSON-RPC Format with the Bitcoin Core Package in Node.js

In this article, we will show you how to send a “RawTransaction” in JSON-RPC format using the Bitcoin Core package in Node.js.

Prerequisites

Before you begin, make sure you have the Bitcoin Core package installed and a compatible version of it running. Also make sure you have a Bitcoin Core node running on your computer with a valid address to which you want to send the raw transaction.

Installing Required Packages

To use the Bitcoin Core package in Node.js, we need to install the “bitcoin-core” package using npm:

npm install bitcoin-core --save

Sending a Raw Transaction in JSON-RPC Format

The following code snippet shows how to send a “RawTransaction” in JSON-RPC format using the Bitcoin Core package:

const BitcoinCore = request('bitcoin-core');
// Set up a Bitcoin Core connection
const bc = new BitcoinCore({
url: " // replace with your Bitcoin Core node URL
});
// Create a new transaction object
const tx = {
version: 1,
hash: 'your_tx_hash_here',
from_address: 'your_from_address_here',
to_address: 'to_address_here', // optional
flags: 'raw' // optional, can be 'full', 'confirm' or 'send-only'
};
// Create a new raw transaction object
const rawTx = {
tx_type: 'sendrawtransaction',
raw: tx
};
// Send the raw transaction in JSON-RPC format using Bitcoin Core
bc.sendRawTransaction(rawTx, (error, response) => {
if (err) {
console.error('Error sending raw transaction:', err);
} else {
// Get the transaction hash from the response
const txHash = response.hash;
console.log(Transaction hash: ${txHash});
}
});

In this example, we create a new `transaction'' object with the desired properties (version, hash, address-to-address, and flags). We then create a new raw transaction object with the same properties. Finally, we send the raw transaction in JSON-RPC format using thesendRawTransaction'' method of the Bitcoin Core connection.

• Theraw property of the `tx` object specifies that we want to send a raw transaction.

• You can customize the raw transaction by specifying additional flags (e.g. “confirm”, “send only”) or by modifying the properties of the “transaction” object.

• The Bitcoin Core response includes a “hash” field for each raw transaction. This hash can be used as a reference to verify the integrity of the transaction.

By following the steps below, you should now be able to send raw transactions in JSON-RPC format using the Bitcoin Core package in Node.js.