watch for Simplcity spends.md

For Simplicity on a signet

(Untested code)

Watch for Simplicity spends

import zmq
from bitcoinrpc import BitcoinRPC  # Or elementsrpc for Liquid
rpc = BitcoinRPC('user', 'pass', 'http://localhost:18884')  # Liquid testnet port example
context = zmq.Context()
socket = context.socket(zmq.SUB)
socket.connect('tcp://127.0.0.1:29000')  # ZMQ for blocks
socket.setsockopt(zmq.SUBSCRIBE, b'rawblock')
while True:
    topic, body = socket.recv_multipart()
    if topic == b'rawblock':
        block_hex = body.hex()
        block = rpc.getblock(block_hex, 2)
        for tx in block['tx']:
            for vin in tx['vin']:
                if 'txinwitness' in vin and len(vin['txinwitness']) > 2:
                    control_block = vin['txinwitness'][-1]
                    leaf_version = int(control_block[:2], 16) & 0xfe  # First byte hex
                    if leaf_version == 0xc2:  # Need to add the version when we know it. 
                        print(f"Potential Simplicity tx: {tx['txid']}")
                        # Optional: Validate script with simplicity lib

Querying blocks for Simplicity spends

from bitcoinrpc import BitcoinRPC

rpc = BitcoinRPC('user', 'pass', 'http://localhost:18884')

def query_simplicity_txs(start_height, end_height=None):
    try:
        current_height = rpc.getblockcount()
        if end_height is None or end_height > current_height:
            end_height = current_height
        
        print(f"Querying blocks from height {start_height} to {end_height}...")
        
        for height in range(start_height, end_height + 1):
            block_hash = rpc.getblockhash(height)
            block = rpc.getblock(block_hash, 2)
            
            for tx in block['tx']:
                for vin in tx['vin']:
                    if 'txinwitness' in vin and len(vin['txinwitness']) > 2:
                        control_block = vin['txinwitness'][-1]
                        leaf_version = int(control_block[:2], 16) & 0xfe  # Mask to get version
                        if leaf_version == 0xc2:  # Adjust to actual Simplicity leaf version (e.g., 0xc2 or confirmed value)
                            print(f"Potential Simplicity tx at height {height}: {tx['txid']}")
                            # Optional: Validate script with simplicity lib, e.g., decode the script item
                            # script = vin['txinwitness'][-2]  # Second-last is the revealed script
                            # Use rust-simplicity or similar to verify: simplicity.decode_program(script)
            
            if height % 100 == 0:  # Progress update every 100 blocks
                print(f"Processed up to height {height}")
        
        print("Query complete.")
    except Exception as e:
        print(f"Error during query: {e}")

# Example usage: Query from block 100000 to current
query_simplicity_txs(start_height=100000)
# Or specify end: query_simplicity_txs(start_height=200000, end_height=200100)