Function taproot_construct

test/functional/test_framework/script.py:917–941

Construct a tree of Taproot spending conditions pubkey: a 32-byte xonly pubkey for the internal pubkey (bytes) scripts: a list of items; each item is either: - a (name, CScript or bytes, leaf version) tuple - a (name, CScript or bytes) tuple (defaulting to leaf ver

(pubkey, scripts=None, treat_internal_as_infinity=False)

TaprootLeafInfo = namedtuple("TaprootLeafInfo", "script,version,merklebranch,leaf_hash")

def taproot_construct(pubkey, scripts=None, treat_internal_as_infinity=False):
    """Construct a tree of Taproot spending conditions

    pubkey: a 32-byte xonly pubkey for the internal pubkey (bytes)
    scripts: a list of items; each item is either:
             - a (name, CScript or bytes, leaf version) tuple
             - a (name, CScript or bytes) tuple (defaulting to leaf version 0xc0)
             - another list of items (with the same structure)
             - a list of two items; the first of which is an item itself, and the
               second is a function. The function takes as input the Merkle root of the
               first item, and produces a (fictitious) partner to hash with.

    Returns: a TaprootInfo object
    """
    if scripts is None:
        scripts = []

    ret, h = taproot_tree_helper(scripts)
    tweak = TaggedHash("TapTweak", pubkey + h)
    if treat_internal_as_infinity:
        tweaked, negated = compute_xonly_pubkey(tweak)
    else:
        tweaked, negated = tweak_add_pubkey(pubkey, tweak)
    leaves = dict((name, TaprootLeafInfo(script, version, merklebranch, leaf)) for name, version, script, merklebranch, leaf in ret)
    return TaprootInfo(CScript([OP_1, tweaked]), pubkey, negated + 0, tweak, leaves, h, tweaked)

def is_op_success(o):
    return o == 0x50 or o == 0x62 or o == 0x89 or o == 0x8a or o == 0x8d or o == 0x8e or (o >= 0x7e and o <= 0x81) or (o >= 0x83 and o <= 0x86) or (o >= 0x95 and o <= 0x99) or (o >= 0xbb and o <= 0xfe)