def assert_signable(self) -> None:
self.assert_valid()
for i, tx_in in enumerate(self.tx.vin):
non_witness_utxo = self.inputs[i].non_witness_utxo
witness_utxo = self.inputs[i].witness_utxo
redeem_script = self.inputs[i].redeem_script
if witness_utxo:
script_pub_key = witness_utxo.script_pub_key
script_type, payload = type_and_payload(script_pub_key.script)
if script_type == "p2sh":
script_type, _ = type_and_payload(redeem_script)
if script_type not in ("p2wpkh", "p2wsh"):
raise BTClibValueError(
"script type not it ('p2wpkh', 'p2wsh')")
elif non_witness_utxo:
script_pub_key = non_witness_utxo.vout[
tx_in.prev_out.vout].script_pub_key
_, payload = type_and_payload(script_pub_key.script)
else:
err_msg = "missing script_pub_key"
raise BTClibValueError(err_msg)
if redeem_script and payload != hash160(redeem_script):
raise BTClibValueError("invalid redeem script hash160")
if self.inputs[i].witness_script:
if redeem_script:
_, payload = type_and_payload(redeem_script)
if payload != sha256(self.inputs[i].witness_script):
raise BTClibValueError("invalid witness script sha256")
def test_p2wpkh() -> None:
# self-consistency
pub_key = "02 cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaf"
payload = hash160(pub_key)
script_pub_key = serialize(["OP_0", payload])
assert_p2wpkh(script_pub_key)
assert script_pub_key == ScriptPubKey.p2wpkh(pub_key).script
assert ("p2wpkh", payload) == type_and_payload(script_pub_key)
# bech32 address
network = "mainnet"
addr = b32.p2wpkh(pub_key, network)
assert addr == address(script_pub_key, network)
assert addr == b32.address_from_witness(0, payload, network)
# back from the address to the script_pub_key
assert script_pub_key == ScriptPubKey.from_address(addr).script
assert network == ScriptPubKey.from_address(addr).network
# p2sh-wrapped base58 address
addr = b58.p2wpkh_p2sh(pub_key, network)
assert addr == "3BJxz2r8zY7LxJfdGjUpjjHNh6YEiitvf2"
err_msg = "invalid witness version: "
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2wpkh(b"\x33" + script_pub_key[1:])
err_msg = "invalid pub_key hash length marker: "
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2wpkh(script_pub_key[:1] + b"\x00" + script_pub_key[2:])
def test_p2wsh() -> None:
# self-consistency
pub_key = "02 cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaf"
redeem_script = ScriptPubKey.p2pkh(pub_key).script
payload = sha256(redeem_script)
script_pub_key = serialize(["OP_0", payload])
assert_p2wsh(script_pub_key)
assert script_pub_key == ScriptPubKey.p2wsh(redeem_script).script
assert ("p2wsh", payload) == type_and_payload(script_pub_key)
# bech32 address
network = "mainnet"
addr = b32.p2wsh(redeem_script, network)
assert addr == address(script_pub_key, network)
assert addr == b32.address_from_witness(0, payload, network)
# back from the address to the script_pub_key
assert script_pub_key == ScriptPubKey.from_address(addr).script
assert network == ScriptPubKey.from_address(addr).network
# p2sh-wrapped base58 address
addr = b58.p2wsh_p2sh(redeem_script, network)
assert addr == "39GUePMSQ4mADpihVLd8cFQ2tih9Fy4qkz"
err_msg = "invalid witness version: "
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2wsh(b"\x33" + script_pub_key[1:])
err_msg = "invalid redeem script hash length marker: "
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2wsh(script_pub_key[:1] + b"\x00" + script_pub_key[2:])
def test_p2ms_2() -> None:
m = 1
# all uncompressed
pub_key0 = "04 cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaf f7d8a473e7e2e6d317b87bafe8bde97e3cf8f065dec022b51d11fcdd0d348ac4"
pub_key1 = "04 61cbdcc5409fb4b4d42b51d33381354d80e550078cb532a34bfa2fcfdeb7d765 19aecc62770f5b0e4ef8551946d8a540911abe3e7854a26f39f58b25c15342af"
pub_key2 = "04 79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798 483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8"
uncompressed_pub_keys: List[Key] = [pub_key0, pub_key1, pub_key2]
# mixed compressed / uncompressed public keys
pub_key0 = "04 cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaf f7d8a473e7e2e6d317b87bafe8bde97e3cf8f065dec022b51d11fcdd0d348ac4"
pub_key1 = "03 61cbdcc5409fb4b4d42b51d33381354d80e550078cb532a34bfa2fcfdeb7d765"
pub_key2 = "02 79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798"
mixed_pub_keys: List[Key] = [pub_key0, pub_key1, pub_key2]
for pub_keys in (uncompressed_pub_keys, mixed_pub_keys):
for lexi_sort in (True, False):
script_pub_key = ScriptPubKey.p2ms(m,
pub_keys,
lexi_sort=lexi_sort).script
assert is_p2ms(script_pub_key)
assert address(script_pub_key) == ""
script_type, payload = type_and_payload(script_pub_key)
assert script_type == "p2ms"
assert payload == script_pub_key[:-1]
def test_valid_script_path() -> None:
fname = "tapscript_test_vector.json"
filename = path.join(path.dirname(__file__), "_data", fname)
with open(filename, "r", encoding="ascii") as file_:
data = json.load(file_)
for x in data:
prevouts = [TxOut.parse(prevout) for prevout in x["prevouts"]]
index = x["index"]
if not is_p2tr(prevouts[index].script_pub_key.script):
continue
script_sig = x["success"]["scriptSig"]
assert not script_sig
witness = Witness(x["success"]["witness"])
if len(witness.stack) >= 2 and witness.stack[-1][0] == 0x50:
witness.stack = witness.stack[:-1]
# check script paths
if len(witness.stack) < 2:
continue
Q = type_and_payload(prevouts[index].script_pub_key.script)[1]
script = witness.stack[-2]
control = witness.stack[-1]
assert check_output_pubkey(Q, script, control)
def test_nulldata() -> None:
OP_RETURN = b"\x6a" # pylint: disable=invalid-name
# self-consistency
string = "time-stamped data"
payload = string.encode()
script_pub_key = serialize(["OP_RETURN", payload])
assert script_pub_key == ScriptPubKey.nulldata(string).script
# back from the script_pub_key to the payload
assert ("nulldata", payload) == type_and_payload(script_pub_key)
# data -> payload in this case is invertible (no hash functions)
assert payload.decode("ascii") == string
assert address(script_pub_key) == ""
# documented test cases: https://learnmeabitcoin.com/guide/nulldata
string = "hello world"
payload = string.encode()
assert payload.hex() == "68656c6c6f20776f726c64" # pylint: disable=no-member
script_pub_key = OP_RETURN + var_bytes.serialize(payload)
assert script_pub_key == ScriptPubKey.nulldata(string).script
assert ("nulldata", payload) == type_and_payload(script_pub_key)
# documented test cases: https://learnmeabitcoin.com/guide/nulldata
string = "charley loves heidi"
payload = string.encode()
assert (payload.hex() # pylint: disable=no-member
== "636861726c6579206c6f766573206865696469")
script_pub_key = OP_RETURN + var_bytes.serialize(payload)
assert script_pub_key == ScriptPubKey.nulldata(string).script
assert ("nulldata", payload) == type_and_payload(script_pub_key)
# documented test cases: https://learnmeabitcoin.com/guide/nulldata
string = "家族も友達もみんなが笑顔の毎日がほしい"
payload = string.encode()
assert (
payload.hex() # pylint: disable=no-member
==
"e5aeb6e6978fe38282e58f8be98194e38282e381bfe38293e381aae3818ce7ac91e9a194e381aee6af8ee697a5e3818ce381bbe38197e38184"
)
script_pub_key = OP_RETURN + var_bytes.serialize(payload)
assert script_pub_key == ScriptPubKey.nulldata(string).script
assert ("nulldata", payload) == type_and_payload(script_pub_key)
def witness_v0_script(script_pub_key: Octets) -> List[bytes]:
script_type, payload = type_and_payload(script_pub_key)
if script_type == "p2wpkh":
script = serialize(
["OP_DUP", "OP_HASH160", payload, "OP_EQUALVERIFY", "OP_CHECKSIG"])
return [script]
script_s: List[bytes] = []
current_script: List[Command] = []
for token in parse(script_pub_key)[::-1]:
if token == "OP_CODESEPARATOR": # nosec required for python < 3.8
script_s.append(serialize(current_script[::-1]))
current_script.append(token)
script_s.append(serialize(current_script[::-1]))
return script_s[::-1]
def test_p2tr() -> None:
pub_key = "cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaf"
payload = output_pubkey(pub_key)[0]
script_pub_key = serialize(["OP_1", payload])
assert_p2tr(script_pub_key)
assert ("p2tr", payload) == type_and_payload(script_pub_key)
network = "mainnet"
addr = b32.p2tr(pub_key, network=network)
assert addr == address(script_pub_key, network)
assert script_pub_key == ScriptPubKey.from_address(addr).script
assert script_pub_key == ScriptPubKey.p2tr(pub_key).script
err_msg = "invalid redeem script hash length marker: "
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2tr(script_pub_key[:1] + b"\x00" + script_pub_key[2:])
def test_nulldata4() -> None:
script_: List[Command] = [
"OP_RETURN",
"OP_RETURN",
"OP_3",
"OP_1",
"OP_VERIF",
"OP_0",
"OP_3",
]
# FIXME: serialization is not 0x6A{1 byte data-length}{data 6 bytes)}
script_pub_key = serialize(script_)
assert len(script_pub_key) == 7
assert parse(script_pub_key) == script_
script_type, _ = type_and_payload(script_pub_key)
# FIXME: it should be "nulldata"
assert script_type == "unknown"
def test_p2pkh() -> None:
# self-consistency
pub_key = (
"04 "
"cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaf"
"f7d8a473e7e2e6d317b87bafe8bde97e3cf8f065dec022b51d11fcdd0d348ac4")
payload = hash160(pub_key)
script_pub_key = serialize(
["OP_DUP", "OP_HASH160", payload, "OP_EQUALVERIFY", "OP_CHECKSIG"])
assert_p2pkh(script_pub_key)
assert script_pub_key == ScriptPubKey.p2pkh(pub_key).script
assert ("p2pkh", payload) == type_and_payload(script_pub_key)
# base58 address
network = "mainnet"
addr = b58.p2pkh(pub_key, network)
assert addr == address(script_pub_key, network)
assert addr == b58.address_from_h160("p2pkh", payload, network)
# back from the address to the script_pub_key
assert script_pub_key == ScriptPubKey.from_address(addr).script
assert network == ScriptPubKey.from_address(addr).network
# documented test case: https://learnmeabitcoin.com/guide/p2pkh
payload = bytes.fromhex("12ab8dc588ca9d5787dde7eb29569da63c3a238c")
script_pub_key = bytes.fromhex("76a914") + payload + bytes.fromhex("88ac")
assert_p2pkh(script_pub_key)
addr = "12higDjoCCNXSA95xZMWUdPvXNmkAduhWv"
assert addr == address(script_pub_key, network)
assert script_pub_key == ScriptPubKey.from_address(addr).script
assert network == ScriptPubKey.from_address(addr).network
err_msg = "missing final OP_EQUALVERIFY, OP_CHECKSIG"
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2pkh(script_pub_key[:-2] + b"\x40\x40")
err_msg = "missing leading OP_DUP, OP_HASH160"
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2pkh(b"\x40\x40" + script_pub_key[2:])
err_msg = "invalid pub_key hash length marker: "
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2pkh(script_pub_key[:2] + b"\x40" + script_pub_key[3:])
def test_p2sh() -> None:
# self-consistency
pub_key = "02 cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaf"
redeem_script = ScriptPubKey.p2pkh(pub_key).script
payload = hash160(redeem_script)
script_pub_key = serialize(["OP_HASH160", payload, "OP_EQUAL"])
assert_p2sh(script_pub_key)
assert script_pub_key == ScriptPubKey.p2sh(redeem_script).script
assert ("p2sh", payload) == type_and_payload(script_pub_key)
# base58 address
network = "mainnet"
addr = b58.p2sh(redeem_script, network)
assert addr == address(script_pub_key, network)
assert addr == b58.address_from_h160("p2sh", payload, network)
# back from the address to the script_pub_key
assert script_pub_key == ScriptPubKey.from_address(addr).script
assert network == ScriptPubKey.from_address(addr).network
# documented test case: https://learnmeabitcoin.com/guide/p2sh
payload = bytes.fromhex("748284390f9e263a4b766a75d0633c50426eb875")
script_pub_key = bytes.fromhex("a914") + payload + bytes.fromhex("87")
assert_p2sh(script_pub_key)
addr = "3CK4fEwbMP7heJarmU4eqA3sMbVJyEnU3V"
assert addr == address(script_pub_key, network)
assert script_pub_key == ScriptPubKey.from_address(addr).script
assert network == ScriptPubKey.from_address(addr).network
err_msg = "missing final OP_EQUAL"
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2sh(script_pub_key[:-1] + b"\x40")
err_msg = "missing leading OP_HASH160"
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2sh(b"\x40" + script_pub_key[1:])
err_msg = "invalid redeem script hash length marker: "
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2sh(script_pub_key[:1] + b"\x40" + script_pub_key[2:])
def test_invalid_taproot_key_path() -> None:
fname = "tapscript_test_vector.json"
filename = path.join(path.dirname(__file__), "_data", fname)
with open(filename, "r", encoding="ascii") as file_:
data = json.load(file_)
for x in filter(lambda x: "failure" in x.keys(), data):
tx = Tx.parse(x["tx"])
prevouts = [TxOut.parse(prevout) for prevout in x["prevouts"]]
index = x["index"]
if not is_p2tr(prevouts[index].script_pub_key.script):
continue
witness = Witness(x["failure"]["witness"])
tx.vin[index].script_witness = witness
# check only key paths
if (len(witness.stack) == 1
or len(witness.stack) == 2 and witness.stack[-1][0] == 0x50):
with pytest.raises(
(BTClibRuntimeError, BTClibValueError, AssertionError)):
assert not x["failure"]["scriptSig"]
sighash_type = 0 # all
signature = witness.stack[0][:64]
if len(witness.stack[0]) == 65:
sighash_type = witness.stack[0][-1]
if sighash_type == 0:
raise BTClibValueError(
"invalid sighash 0 in 65 bytes signature")
msg_hash = sig_hash.from_tx(prevouts, tx, index, sighash_type)
pub_key = type_and_payload(
prevouts[index].script_pub_key.script)[1]
ssa.assert_as_valid_(msg_hash, pub_key, signature)
def test_bip67() -> None:
"BIP67 test vectors https://en.bitcoin.it/wiki/BIP_0067"
data_folder = path.join(path.dirname(__file__), "_data")
filename = path.join(data_folder, "bip67_test_vectors.json")
with open(filename, "r") as file_:
# json.dump(test_vectors, f, indent=4)
test_vectors = json.load(file_)
m = 2
for i in test_vectors:
keys, addr = test_vectors[i]
script_pub_key = ScriptPubKey.p2ms(m, keys, lexi_sort=True).script
assert is_p2ms(script_pub_key)
assert address(script_pub_key) == ""
script_type, payload = type_and_payload(script_pub_key)
assert script_type == "p2ms"
assert payload == script_pub_key[:-1]
errmsg = f"Test vector #{i}"
assert addr == b58.p2sh(script_pub_key), errmsg
def test_p2pk() -> None:
# self-consistency
pub_key = "02 cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaf"
script_pub_key = serialize([pub_key, "OP_CHECKSIG"])
assert_p2pk(script_pub_key)
assert script_pub_key == ScriptPubKey.p2pk(pub_key).script
assert ("p2pk", bytes.fromhex(pub_key)) == type_and_payload(script_pub_key)
assert address(script_pub_key) == ""
err_msg = "invalid pub_key length marker: "
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2pk(b"\x31" + script_pub_key[1:])
# documented test case: https://learnmeabitcoin.com/guide/p2pk
pub_key = (
"04"
"ae1a62fe09c5f51b13905f07f06b99a2f7159b2225f374cd378d71302fa28414"
"e7aab37397f554a7df5f142c21c1b7303b8a0626f1baded5c72a704f7e6cd84c")
script_pub_key = bytes.fromhex("41" + pub_key + "ac")
assert_p2pk(script_pub_key)
assert script_pub_key == ScriptPubKey.p2pk(pub_key).script
err_msg = "missing final OP_CHECKSIG"
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2pk(script_pub_key[:-1] + b"\x00")
err_msg = "invalid pub_key length marker: "
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2pk(b"\x31" + script_pub_key[1:])
# invalid size: 34 bytes instead of (33, 65)
pub_key = "03 ae1a62fe09c5f51b13905f07f06b99a2f7159b2225f374cd378d71302fa28414 14"
err_msg = "not a private or public key: "
with pytest.raises(BTClibValueError, match=err_msg):
ScriptPubKey.p2pk(pub_key)
def test_valid_taproot_key_path() -> None:
fname = "tapscript_test_vector.json"
filename = path.join(path.dirname(__file__), "_data", fname)
with open(filename, "r", encoding="ascii") as file_:
data = json.load(file_)
for x in filter(lambda x: "TAPROOT" in x["flags"], data):
tx = Tx.parse(x["tx"])
prevouts = [TxOut.parse(prevout) for prevout in x["prevouts"]]
index = x["index"]
if not is_p2tr(prevouts[index].script_pub_key.script):
continue
assert not x["success"]["scriptSig"]
witness = Witness(x["success"]["witness"])
tx.vin[index].script_witness = witness
if (len(witness.stack) == 1
or len(witness.stack) == 2 and witness.stack[-1][0] == 0x50):
sighash_type = 0 # all
signature = witness.stack[0][:64]
if len(witness.stack[0]) == 65:
sighash_type = witness.stack[0][-1]
assert sighash_type != 0
msg_hash = sig_hash.from_tx(prevouts, tx, index, sighash_type)
pub_key = type_and_payload(
prevouts[index].script_pub_key.script)[1]
ssa.assert_as_valid_(msg_hash, pub_key, signature)
def test_p2ms_1() -> None:
# self-consistency
pub_key0 = "04 cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaf f7d8a473e7e2e6d317b87bafe8bde97e3cf8f065dec022b51d11fcdd0d348ac4"
pub_key1 = "04 61cbdcc5409fb4b4d42b51d33381354d80e550078cb532a34bfa2fcfdeb7d765 19aecc62770f5b0e4ef8551946d8a540911abe3e7854a26f39f58b25c15342af"
# documented test case: https://learnmeabitcoin.com/guide/p2ms
script_pub_key = bytes.fromhex( # fmt: off
"51" # OP_1
"41" # canonical 65-bytes push
+ pub_key0 + "41" # noqa E148 # canonical 65-bytes push
+ pub_key1 + "52" # noqa E148 # OP_2
"ae" # OP_CHECKMULTISIG
) # fmt: on
assert is_p2ms(script_pub_key)
assert address(script_pub_key) == ""
script_type, payload = type_and_payload(script_pub_key)
assert script_type == "p2ms"
assert payload == script_pub_key[:-1]
pub_keys: List[Key] = [pub_key0, pub_key1]
assert script_pub_key == ScriptPubKey.p2ms(1, pub_keys,
lexi_sort=False).script
err_msg = "invalid m in m-of-n: "
with pytest.raises(BTClibValueError, match=err_msg):
ScriptPubKey.p2ms(4, pub_keys)
err_msg = "invalid n in m-of-n: "
with pytest.raises(BTClibValueError, match=err_msg):
# pylance cannot grok the following line
ScriptPubKey.p2ms(4, [pub_key0] * 17) # type: ignore
err_msg = "invalid m in m-of-n: "
with pytest.raises(BTClibValueError, match=err_msg):
ScriptPubKey.p2ms(0, pub_keys)
err_msg = "invalid m in m-of-n: "
with pytest.raises(BTClibValueError, match=err_msg):
ScriptPubKey.p2ms(17, pub_keys)
err_msg = "not a private or public key: "
with pytest.raises(BTClibValueError, match=err_msg):
ScriptPubKey.p2ms(1, [pub_key0 + "00", pub_key1])
script_: List[Command] = [
"OP_1",
pub_key0 + "00",
pub_key1,
"OP_2",
"OP_CHECKMULTISIG",
]
script_pub_key = serialize(script_)
assert not is_p2ms(script_pub_key)
err_msg = "invalid key in p2ms"
script_pub_key = serialize(
["OP_1", pub_key0, "00", "OP_2", "OP_CHECKMULTISIG"])
assert not is_p2ms(script_pub_key)
script_pub_key = serialize(
["OP_1", pub_key0, pub_key1, "OP_2", "OP_CHECKMULTISIG"])
assert is_p2ms(script_pub_key)
script_pub_key = serialize(
["OP_2", pub_key0, pub_key1, "OP_2", "OP_CHECKMULTISIG"])
assert is_p2ms(script_pub_key)
script_pub_key = serialize(
["OP_0", pub_key0, pub_key1, "OP_2", "OP_CHECKMULTISIG"])
assert not is_p2ms(script_pub_key)
script_pub_key = serialize(
["OP_3", pub_key0, pub_key1, "OP_2", "OP_CHECKMULTISIG"])
assert not is_p2ms(script_pub_key)
script_pub_key = serialize(["OP_1", "OP_2", "OP_CHECKMULTISIG"])
assert not is_p2ms(script_pub_key)
script_pub_key = serialize(["OP_1", pub_key0, "OP_2", "OP_CHECKMULTISIG"])
assert not is_p2ms(script_pub_key)
script_pub_key = serialize(
["OP_1", pub_key0, pub_key1, "OP_3", "OP_CHECKMULTISIG"])
assert not is_p2ms(script_pub_key)
pub_key2 = "04 79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798 483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8"
script_pub_key = serialize(
["OP_1", pub_key0, pub_key1, pub_key2, "OP_3", "OP_CHECKMULTISIG"])
assert_p2ms(script_pub_key)
err_msg = "invalid p2ms script_pub_key size"
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2ms(script_pub_key[:133] + b"\x40" + script_pub_key[134:])
with pytest.raises(BTClibValueError, match=err_msg):
assert_p2ms(script_pub_key[:-2] + b"\x00" + script_pub_key[-2:])
def test_unknown() -> None:
script_pub_key = serialize(["OP_16", 20 * b"\x00"])
assert address(script_pub_key) == ""
assert type_and_payload(script_pub_key) == ("unknown", script_pub_key)
def test_nulldata2() -> None:
for length in (0, 1, 16, 17, 74, 75, 76, 77, 78, 79, 80):
payload = b"\x00" * length
script_pub_key = serialize(["OP_RETURN", payload])
assert ("nulldata", payload) == type_and_payload(script_pub_key)
