Ethereum: How to fetch transaction from input address using bitcoind JSON-RPC?

Using Bitcoind JSON-RPC to Retrieve Unspent Transaction Outputs

In this article, we’ll explore how to use the Bitcoind JSON-RPC protocol to retrieve unspent transaction outputs (UTXOs) from an address that used a single transaction. We’ll also discuss why listtransactions doesn’t list those addresses.

What are Unspent Transaction Outputs?

Unspent transaction outputs represent the available funds in a wallet, which can be spent again using Bitcoin transactions. When you create a new transaction, it’s not immediately spent; instead, it’s converted into unspent transaction outputs that can be used later.

The Problem: listtransactions Doesn’t List Unspent TXOs

In your node instance, listtransactions might not list addresses with multiple unspent transaction outputs because these addresses have:

• Limited or no funds: They might not have any unspent transaction outputs (UTXOs) to display.

• No transactions in the blockchain: The address is part of a single transaction, so there are no new UTXOs being created.

Using Bitcoind JSON-RPC: A Solution

To retrieve unspent transaction outputs from an address that used a single transaction, you need to use Bitcoind’s JSON-RPC protocol. Here’s the step-by-step guide:

• Set up your node instance: Make sure your Bitcoin node is running and configured correctly.

• Create a request for unspent transaction outputs: Use the GET method (GET) with the UNSPENTTXOUTS parameter to retrieve unspent transaction outputs.

• Specify the address and transaction hash (optional)

  : If you know the original sender’s address or the transaction hash, you can add it as a query parameter.

Sample Request

Here’s an example request:

GET /jsonrpc/2.0/pokewallet/1.0/getunspenttxoutlist?method=UNSPENTTXOUTS&address=&txid=

Replace with the actual address you’re interested in, and with the hash of the single transaction that used this address.

Response

The response will contain a list of unspent transaction outputs for the specified address. Each output is represented as an object with fields like amount (the available funds) and txid (the transaction hash).

For example, if you retrieve the list for an address that used a single transaction with hash 1234567890abcdef, you’ll get something like:

{

  "unspenttxoutlist": [

    {

      "txid": "1234567890abcdef",

      "amount": 0.00001,

      "pubkey": "your_public_key"

    }

  ]

}

This response tells you that the address has one unspent transaction output with an amount of 0.00001 Satoshis.

By using Bitcoind JSON-RPC, you can retrieve unspent transaction outputs from any address that used a single transaction. This is particularly useful when you need to analyze or audit wallet activity on behalf of regulatory authorities or other organizations.

Remember to always follow best practices for handling sensitive data and ensure that your node instance is properly secured.

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