INNER CODE UNIT · Python

is_p2tr

BlockstreamResearch/secp256k1-zkp · tools/tests_silentpayments_generate.py:30

def is_p2tr(s):  # OP_1 OP_PUSHBYTES_32 <32 bytes>
    return (len(s) == 34) and (s[0] == 0x51) and (s[1] == 0x20)

def get_pubkey_from_input(input_data, pubkey_hex):
    """Extract the correct pubkey for an input, handling NUMS_H filtering and format conversion"""
    spk = bytes.fromhex(input_data['prevout']['scriptPubKey']['hex'])
    pubkey = bytes.fromhex(pubkey_hex)

    if is_p2tr(spk):  # taproot input
        # Check for NUMS_H in witness (should be skipped)
        witness = bytes.fromhex(input_data.get('txinwitness', ''))
        # Parse witness stack
        witness_stack = []
        num_witness_items = 0
        if len(witness) > 0:
            num_witness_items = witness[0]
            witness = witness[1:]
        for i in range(num_witness_items):

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