import hashlib

from embit.script import Script


def address_to_scripthash(address: str) -> str:
    """Electrum protocol scripthash: sha256(scriptPubKey), byte-reversed, hex.

    Uses `.data` (the raw scriptPubKey bytes), not `.serialize()` — the latter
    prefixes a compact-size length byte meant for embedding the script as pushdata
    elsewhere (e.g. a P2SH redeemScript), which is not part of the actual on-chain
    output script and produces a wrong (unmatchable) scripthash if used here.
    """
    script_pubkey = Script.from_address(address).data
    return hashlib.sha256(script_pubkey).digest()[::-1].hex()