Getting Non-Wallet Transactions from Ethereum Using bitcoin-rpc

As you’re exploring the Bitcoin protocol with Bitcoin-Qt, you can leverage its API, specifically bitcoin-rpc, to fetch non-wallet transactions. In this article, we’ll walk through the process of fetching all transactions in a specific block and then extracting information about them.

Prerequisites

Before proceeding, ensure you have:

• Bitcoin-Qt installed on your system.

• A working connection to the Ethereum network (you can use bitcoin-rpc‘s built-in client or external tools like geth).

Fetching All Blocks and Transactions

To get all blocks and their transactions, you can use a loop that continuously calls getblockchaininfo with the raw parameter set to 1. This will retrieve a list of blocks in JSON format.

import bitcoinrpc


def get_blocks_and_transactions():

    rpc = bitcoinrpc.RPC()

    block_info = rpc.getblockchaininfo([1000])  




fetch the first 1000 blocks

    for block in block_info['blocks']:

        print(f"Block {block['hash']}:")

        for tx in block['transactions']:

            print(tx['hex'])

This code will output a list of transactions associated with each block.

Fetching Non-Wallet Transactions

To get non-wallet (i.e., publicly available) transactions, you need to fetch them using the gettransaction RPC call. This method is more complex because it requires interacting directly with the Ethereum network.

Here’s an example implementation in Python:

import bitcoinrpc


def get_non_wallet_transactions(block_hash):

    rpc = bitcoinrpc.RPC()

    tx_list = []

    for i in range(1, 100):  
fetch up to 99 transactions for demonstration purposes

        try:

            transaction = rpc.gettransaction(block_hash, i)['transaction']['hex']

            if 'from' not in transaction:  
non-wallet transactions don't have a 'from' address

                tx_list.append(transaction)

        except Exception as e:

            print(f"Error fetching transaction {i}: {e}")

    return tx_list



Example usage

block_hash = "your_block_hash_here"

non_wallet_txs = get_non_wallet_transactions(block_hash)

for tx in non_wallet_txs:

    print(tx)

This code fetches up to 99 transactions for each block and prints them.

Important Considerations

When working with bitcoin-rpc, keep the following in mind:

• The gettransaction method returns a list of transaction objects, which contain information like from, to, value, etc.

• Non-wallet transactions typically don’t have a ‘from’ address or other publicly available details. Therefore, this example will only fetch non-wallet transactions that are directly linked to the specified block hash.

Please note that these examples demonstrate basic usage of bitcoin-rpc and may require adjustments based on your specific requirements. Also, be aware that interacting with the Ethereum network can be resource-intensive; always ensure you have sufficient connections or consider using more efficient methods like caching or pagination for large datasets.