def test_creation() -> None:
psbt_str = "cHNidP8BAJoCAAAAAljoeiG1ba8MI76OcHBFbDNvfLqlyHV5JPVFiHuyq911AAAAAAD/////g40EJ9DsZQpoqka7CwmK6kQiwHGyyng1Kgd5WdB86h0BAAAAAP////8CcKrwCAAAAAAWABTYXCtx0AYLCcmIauuBXlCZHdoSTQDh9QUAAAAAFgAUAK6pouXw+HaliN9VRuh0LR2HAI8AAAAAAAAAAAA="
psbt = Psbt.b64decode(psbt_str)
assert psbt.b64encode() == psbt_str
output_1 = TxOut(
149990000,
ScriptPubKey("0014d85c2b71d0060b09c9886aeb815e50991dda124d"))
output_2 = TxOut(
100000000,
ScriptPubKey("001400aea9a2e5f0f876a588df5546e8742d1d87008f"))
input_1 = TxIn(
OutPoint(
"75ddabb27b8845f5247975c8a5ba7c6f336c4570708ebe230caf6db5217ae858",
0),
b"",
0xFFFFFFFF,
)
input_2 = TxIn(
OutPoint(
"1dea7cd05979072a3578cab271c02244ea8a090bbb46aa680a65ecd027048d83",
1),
b"",
0xFFFFFFFF,
)
transaction = Tx(2, 0, [input_1, input_2], [output_1, output_2])
psbt_from_tx_ = Psbt.from_tx(transaction)
assert psbt_from_tx_ == psbt
def test_p2pk() -> None:
pub_key = "0479BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8"
signature = "304402200A5C6163F07B8D3B013C4D1D6DBA25E780B39658D79BA37AF7057A3B7F15FFA102201FD9B4EAA9943F734928B99A83592C2E7BF342EA2680F6A2BB705167966B742001"
script_pub_key = serialize([pub_key, "OP_CHECKSIG"])
script_sig = serialize([signature])
founding_tx_script = serialize(["OP_0", "OP_0"])
tx_in = TxIn(OutPoint(b"\x00" * 32, 0xFFFFFFFF), founding_tx_script, 0xFFFFFFFF)
funding_tx = Tx(1, 0, [tx_in], [TxOut(0, script_pub_key)])
tx_in = TxIn(OutPoint(funding_tx.id, 0), script_sig, 0xFFFFFFFF)
receiving_tx = Tx(1, 0, [tx_in], [TxOut(0, b"")])
hash_ = sig_hash.from_tx(funding_tx.vout, receiving_tx, 0, sig_hash.ALL)
assert dsa.verify_(hash_, pub_key, bytes.fromhex(signature)[:-1])
def test_p2pk_anyonecanpay() -> None:
pub_key = "048282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f5150811f8a8098557dfe45e8256e830b60ace62d613ac2f7b17bed31b6eaff6e26caf"
signature = "304402204710a85181663b32d25c70ec2bbd14adff5ddfff6cb50d09e155ef5f541fc86c0220056b0cc949be9386ecc5f6c2ac0493269031dbb185781db90171b54ac127790281"
script_pub_key = serialize([pub_key, "OP_CHECKSIG"])
script_sig = serialize([signature])
founding_tx_script = serialize(["OP_0", "OP_0"])
tx_in = TxIn(OutPoint(b"\x00" * 32, 0xFFFFFFFF), founding_tx_script,
0xFFFFFFFF)
funding_tx = Tx(1, 0, [tx_in], [TxOut(0, script_pub_key)])
tx_in = TxIn(OutPoint(funding_tx.id, 0), script_sig, 0xFFFFFFFF)
receiving_tx = Tx(1, 0, [tx_in], [TxOut(0, b"")])
hash_ = sig_hash.from_tx(funding_tx.vout, receiving_tx, 0,
sig_hash.ANYONECANPAY | sig_hash.ALL)
assert dsa.verify_(hash_, pub_key, bytes.fromhex(signature)[:-1])
def parse(cls: Type[_Tx],
data: BinaryData,
check_validity: bool = True) -> _Tx:
"Return a Tx by parsing binary data."
stream = bytesio_from_binarydata(data)
# version is a signed int (int32_t, not uint32_t)
version = int.from_bytes(stream.read(4),
byteorder="little",
signed=True)
segwit = stream.read(2) == _SEGWIT_MARKER
if not segwit:
# Change stream position: seek to byte offset relative to position
stream.seek(-2, SEEK_CUR) # current position
n = var_int.parse(stream)
vin = [TxIn.parse(stream) for _ in range(n)]
n = var_int.parse(stream)
vout = [TxOut.parse(stream) for _ in range(n)]
if segwit:
for tx_in in vin:
tx_in.script_witness = Witness.parse(stream, check_validity)
lock_time = int.from_bytes(stream.read(4),
byteorder="little",
signed=False)
return cls(version, lock_time, vin, vout, check_validity)
def test_legacy_p2pkh() -> None:
pub_key = "04280c8f66bf2ccaeb3f60a19ad4a06365f8bd6178aab0e709df2173df8f553366549aec336aae8742a84702b6c7c3052d89f5d76d535ec3716e72187956351613"
signature = "3045022100ea43c4800d1a860ec89b5273898a146cfb01d34ff4c364d24a110c480d0e3f7502201c82735577f932f1ca8e1c54bf653e0f8e74e408fe83666bc85cac4472ec950801"
script_sig = serialize([signature, pub_key])
out_point = OutPoint(
"d8343a35ba951684f2969eafe833d9e6fe436557b9707ae76802875952e860fc", 1)
tx_in = TxIn(out_point, script_sig, 0xFFFFFFFF)
tx_out1 = TxOut(
2017682,
bytes.fromhex("76a91413bd20236d0da56492c325dce289b4da35b4b5bd88ac"))
tx_out2 = TxOut(
1049154982,
bytes.fromhex("76a914da169b45781ca210f8c11617ba66bd843da76b1688ac"))
tx = Tx(1, 0, [tx_in], [tx_out1, tx_out2])
script_pub_key = serialize([
"OP_DUP",
"OP_HASH160",
"82ac30f58baf99ec9d14e6181eee076f4e27f69c",
"OP_EQUALVERIFY",
"OP_CHECKSIG",
])
utxo = TxOut(1051173696, script_pub_key)
hash_ = sig_hash.from_tx([utxo], tx, 0, sig_hash.ALL)
assert dsa.verify_(hash_, pub_key, bytes.fromhex(signature)[:-1])
def test_dataclasses_json_dict() -> None:
fname = "d4f3c2c3c218be868c77ae31bedb497e2f908d6ee5bbbe91e4933e6da680c970.bin"
filename = path.join(path.dirname(__file__), "_data", fname)
with open(filename, "rb") as binary_file_:
temp = Tx.parse(binary_file_.read())
tx_in = temp.vin[0]
# TxIn dataclass
assert isinstance(tx_in, TxIn)
# TxIn dataclass to dict
tx_in_dict = tx_in.to_dict()
assert isinstance(tx_in_dict, dict)
# TxIn dataclass dict to file
datadir = path.join(path.dirname(__file__), "_generated_files")
filename = path.join(datadir, "tx_in.json")
with open(filename, "w") as file_:
json.dump(tx_in_dict, file_, indent=4)
# TxIn dataclass dict from file
with open(filename, "r") as file_:
tx_dict2 = json.load(file_)
assert isinstance(tx_dict2, dict)
assert tx_in_dict == tx_dict2
# TxIn dataclass from dict
tx_in2 = TxIn.from_dict(tx_in_dict)
assert isinstance(tx_in2, TxIn)
assert tx_in == tx_in2
def test_output_scripts_serialization() -> None:
input_1 = TxIn(
OutPoint(
"75ddabb27b8845f5247975c8a5ba7c6f336c4570708ebe230caf6db5217ae858",
0),
b"",
0xFFFFFFFF,
)
output_1 = TxOut(
149990000,
bytes.fromhex("a914256b3a9ae8145e5094329537dd4d7a25dbc9452087"))
output_2 = TxOut(
100000000,
bytes.fromhex("001400aea9a2e5f0f876a588df5546e8742d1d87008f"))
tx = Tx(2, 0, [input_1], [output_1, output_2])
psbt = Psbt.from_tx(tx)
# p2sh-p2wsh
psbt.outputs[0].redeem_script = bytes.fromhex(
"003BD89EE628E6EB745F99DF1E4AEF64A0DAA814850DAA509F30C0F472E0563C7A")
psbt.outputs[0].witness_script = bytes.fromhex(
"522103dcea327ff7b2b4449413d9dc24cef0cc9e7864bad9d6291f3f1a04b639422c312103a2c5199b333adfaed4fea7ab65485b9e23a6cb317ddae7e8c1f2bd673414bdd352ae"
)
assert Psbt.b64decode(psbt.b64encode()) == psbt
def from_dict(cls: Type["Tx"],
dict_: Mapping[str, Any],
check_validity: bool = True) -> "Tx":
return cls(
dict_["version"],
dict_["locktime"],
[TxIn.from_dict(tx_in, False) for tx_in in dict_["vin"]],
[TxOut.from_dict(tx_out, False) for tx_out in dict_["vout"]],
check_validity,
)
def test_p2pkh() -> None:
pub_key = "038282263212C609D9EA2A6E3E172DE238D8C39CABD5AC1CA10646E23FD5F51508"
signature = "304402206E05A6FE23C59196FFE176C9DDC31E73A9885638F9D1328D47C0C703863B8876022076FEB53811AA5B04E0E79F938EB19906CC5E67548BC555A8E8B8B0FC603D840C01"
script_pub_key = serialize([
"OP_DUP",
"OP_HASH160",
"1018853670F9F3B0582C5B9EE8CE93764AC32B93",
"OP_EQUALVERIFY",
"OP_CHECKSIG",
])
script_sig = serialize([signature, pub_key])
founding_tx_script = serialize(["OP_0", "OP_0"])
tx_in = TxIn(OutPoint(b"\x00" * 32, 0xFFFFFFFF), founding_tx_script,
0xFFFFFFFF)
funding_tx = Tx(1, 0, [tx_in], [TxOut(0, script_pub_key)])
tx_in = TxIn(OutPoint(funding_tx.id, 0), script_sig, 0xFFFFFFFF)
receiving_tx = Tx(1, 0, [tx_in], [TxOut(0, b"")])
hash_ = sig_hash.from_tx(funding_tx.vout, receiving_tx, 0, sig_hash.ALL)
assert dsa.verify_(hash_, pub_key, bytes.fromhex(signature)[:-1])
def test_empty_stack() -> None:
utxo = TxOut(
100000000,
serialize([
"OP_1",
"cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaf"
]),
)
tx_in = TxIn(OutPoint(), "", 1, Witness([]))
tx = Tx(vin=[tx_in], vout=[TxOut(100000000, "")])
err_msg = "Empty stack"
with pytest.raises(BTClibValueError, match=err_msg):
sig_hash.from_tx([utxo], tx, 0, 0)
def test_wrapped_p2tr() -> None:
script = [
"OP_1",
"cc71eb30d653c0c3163990c47b976f3fb3f37cccdcbedb169a1dfef58bbfbfaf",
]
utxo = TxOut(
100000000,
serialize(["OP_HASH160",
hash160(serialize(script)), "OP_EQUAL"]))
tx_in = TxIn(OutPoint(), serialize(script), 1, Witness(["0A" * 32]))
tx = Tx(vin=[tx_in], vout=[TxOut(100000000, "")])
err_msg = "Taproot scripts cannot be wrapped in p2sh"
with pytest.raises(BTClibValueError, match=err_msg):
sig_hash.from_tx([utxo], tx, 0, 0)
def test_psbt() -> None:
prev_out = OutPoint(
"9dcfdb5836ecfe146bdaa896605ba21222f83cd014dd47adde14fab2aba7de9b", 1)
script_sig = b""
sequence = 0xFFFFFFFF
tx_in = TxIn(prev_out, script_sig, sequence)
tx_out1 = TxOut(2500000, "a914f987c321394968be164053d352fc49763b2be55c87")
tx_out2 = TxOut(
6381891,
"0020701a8d401c84fb13e6baf169d59684e17abd9fa216c8cc5b9fc63d622ff8c58d")
version = 1
lock_time = 0
tx = Tx(version, lock_time, [tx_in], [tx_out1, tx_out2])
psbt = Psbt.from_tx(tx)
assert psbt == Psbt.parse(psbt.serialize())
assert psbt == Psbt.from_dict(psbt.to_dict())
def test_valid_sign_2() -> None:
psbt_str = "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"
psbt = Psbt.b64decode(psbt_str)
assert psbt.b64encode() == psbt_str
transaction_input = TxIn(
OutPoint(
"75ddabb27b8845f5247975c8a5ba7c6f336c4570708ebe230caf6db5217ae858",
0),
b"",
0xFFFFFFFF,
)
assert psbt.inputs[0].witness_utxo is not None
# pylance cannot grok the following line, even considering the above line
transaction = Tx(1, 2, [transaction_input],
[psbt.inputs[0].witness_utxo]) # type: ignore
psbt.tx.vin[0].prev_out.tx_id = transaction.id
psbt.inputs[0].non_witness_utxo = transaction
psbt.assert_signable()
def test_coinbase_block_1() -> None:
coinbase_out = "00f2052a0100000043410496b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be63c52da7589379515d4e0a604f8141781e62294721166bf621e73a82cbf2342c858eeac"
tx_out = TxOut.parse(coinbase_out)
assert tx_out.serialize().hex() == coinbase_out
coinbase_inp = ( # prev_out
"0000000000000000000000000000000000000000000000000000000000000000ffffffff"
"0704ffff001d0104" # script_sig
"ffffffff" # sequence
)
tx_in = TxIn.parse(coinbase_inp)
assert tx_in.serialize().hex() == coinbase_inp
assert tx_in.prev_out.is_coinbase
coinbase = "01000000" "01" + coinbase_inp + "01" + coinbase_out + "00000000"
tx = Tx.parse(coinbase)
assert tx.serialize(include_witness=True).hex() == coinbase
assert tx == Tx.from_dict(tx.to_dict())
assert tx.version == 1
assert tx.lock_time == 0
assert len(tx.vin) == 1
assert len(tx.vout) == 1
assert tx.vin[0].script_sig == tx_in.script_sig
assert tx.vout[0].script_pub_key == tx_out.script_pub_key
tx_id = "0e3e2357e806b6cdb1f70b54c3a3a17b6714ee1f0e68bebb44a74b1efd512098"
assert tx.id.hex() == tx_id
assert tx.id == tx.hash
assert tx.size == 134
assert tx.vsize == tx.size
assert tx.weight == tx.size * 4
assert not tx.is_segwit()
assert not any(bool(w) for w in tx.vwitness)
assert not any(bool(tx_in.script_witness) for tx_in in tx.vin)
assert tx.is_coinbase()
def parse(cls: Type["Tx"],
data: BinaryData,
check_validity: bool = True) -> "Tx":
"Return a Tx by parsing binary data."
stream = bytesio_from_binarydata(data)
# version is a signed int (int32_t) in bitcoin_core
# However there are at least two transactions:
# 35e79ee733fad376e76d16d1f10088273c2f4c2eaba1374a837378a88e530005
# c659729a7fea5071361c2c1a68551ca2bf77679b27086cc415adeeb03852e369
# where the version number is negative if it is considered as a signed
# integer. As such in btclib the version is an UNSIGNED integer.
# This has been discussed in: https://github.com/bitcoin/bitcoin/pull/16525
version = int.from_bytes(stream.read(4),
byteorder="little",
signed=False)
segwit = stream.read(2) == _SEGWIT_MARKER
if not segwit:
# Change stream position: seek to byte offset relative to position
stream.seek(-2, SEEK_CUR) # current position
n = var_int.parse(stream)
vin = [TxIn.parse(stream) for _ in range(n)]
n = var_int.parse(stream)
vout = [TxOut.parse(stream) for _ in range(n)]
if segwit:
for tx_in in vin:
tx_in.script_witness = Witness.parse(stream, check_validity)
lock_time = int.from_bytes(stream.read(4),
byteorder="little",
signed=False)
return cls(version, lock_time, vin, vout, check_validity)
def test_tx() -> None:
# default constructor
tx = Tx()
assert not tx.is_segwit()
assert not any(bool(w) for w in tx.vwitness)
assert not any(bool(tx_in.script_witness) for tx_in in tx.vin)
assert not tx.is_coinbase()
assert tx.version == 1
assert tx.lock_time == 0
assert not tx.vin
assert not tx.vout
assert tx.nVersion == tx.version
assert tx.nLockTime == tx.lock_time
tx_id = "d21633ba23f70118185227be58a63527675641ad37967e2aa461559f577aec43"
assert tx.id.hex() == tx_id
assert tx.hash == tx.id
assert tx.size == 10
assert tx.vsize == tx.size
assert tx.weight == tx.size * 4
tx_2 = Tx.from_dict(tx.to_dict())
assert tx_2.is_segwit() == tx.is_segwit()
assert tx_2 == tx
tx_2 = Tx.parse(tx.serialize(include_witness=True))
assert tx_2.is_segwit() == tx.is_segwit()
assert tx_2 == tx
tx_2 = Tx.parse(tx.serialize(include_witness=False))
assert not tx_2.is_segwit()
assert tx_2 == tx
# non-default constructor, no segwit
prev_out = OutPoint(
"9dcfdb5836ecfe146bdaa896605ba21222f83cd014dd47adde14fab2aba7de9b", 1)
script_sig = b""
sequence = 0xFFFFFFFF
tx_in = TxIn(prev_out, script_sig, sequence)
tx_out1 = TxOut(2500000, "a914f987c321394968be164053d352fc49763b2be55c87")
tx_out2 = TxOut(
6381891,
"0020701a8d401c84fb13e6baf169d59684e17abd9fa216c8cc5b9fc63d622ff8c58d")
version = 1
lock_time = 0
tx = Tx(version, lock_time, [tx_in], [tx_out1, tx_out2])
assert not tx.is_segwit()
assert not any(bool(w) for w in tx.vwitness)
assert not any(bool(tx_in.script_witness) for tx_in in tx.vin)
assert not tx.is_coinbase()
assert tx.version == 1
assert tx.lock_time == 0
assert len(tx.vin) == 1
assert len(tx.vout) == 2
assert tx.nVersion == tx.version
assert tx.nLockTime == tx.lock_time
tx_id = "4e52f7848dab7dd89ef7ba477939574198a170bfcb2fb34355c69f5e0169f63c"
assert tx.id.hex() == tx_id
assert tx.hash == tx.id
assert tx.size == 126
assert tx.vsize == tx.size
assert tx.weight == tx.size * 4
tx_2 = Tx.from_dict(tx.to_dict())
assert tx_2.is_segwit() == tx.is_segwit()
assert tx_2 == tx
tx_2 = Tx.parse(tx.serialize(include_witness=True))
assert tx_2.is_segwit() == tx.is_segwit()
assert tx_2 == tx
tx_2 = Tx.parse(tx.serialize(include_witness=False))
assert not tx_2.is_segwit()
assert tx_2 == tx
# non-default constructor, with segwit
version = 1
lock_time = 0
tx = Tx(version, lock_time, [tx_in], [tx_out1, tx_out2])
stack = [
"",
"30440220421fbbedf2ee096d6289b99973509809d5e09589040d5e0d453133dd11b2f78a02205686dbdb57e0c44e49421e9400dd4e931f1655332e8d078260c9295ba959e05d01",
"30440220398f141917e4525d3e9e0d1c6482cb19ca3188dc5516a3a5ac29a0f4017212d902204ea405fae3a58b1fc30c5ad8ac70a76ab4f4d876e8af706a6a7b4cd6fa100f4401",
"52210375e00eb72e29da82b89367947f29ef34afb75e8654f6ea368e0acdfd92976b7c2103a1b26313f430c4b15bb1fdce663207659d8cac749a0e53d70eff01874496feff2103c96d495bfdd5ba4145e3e046fee45e84a8a48ad05bd8dbb395c011a32cf9f88053ae",
]
tx.vin[0].script_witness = Witness(stack)
assert tx.is_segwit()
assert any(bool(w) for w in tx.vwitness)
assert any(bool(tx_in.script_witness) for tx_in in tx.vin)
assert not tx.is_coinbase()
assert tx.version == 1
assert tx.lock_time == 0
assert len(tx.vin) == 1
assert len(tx.vout) == 2
assert tx.nVersion == tx.version
assert tx.nLockTime == tx.lock_time
tx_id = "4e52f7848dab7dd89ef7ba477939574198a170bfcb2fb34355c69f5e0169f63c"
assert tx.id.hex() == tx_id
hash_ = "d39eb3e3954be4bdc0b3be2d980124b1e1e11fb414b886b52939b07d95a58a8f"
assert tx.hash.hex() == hash_
assert tx.size == 380
assert tx.vsize == 190
assert tx.weight == 758
tx_2 = Tx.from_dict(tx.to_dict())
assert tx_2.is_segwit() == tx.is_segwit()
assert tx_2 == tx
tx_2 = Tx.parse(tx.serialize(include_witness=True))
assert tx_2.is_segwit() == tx.is_segwit()
assert tx_2 == tx
tx_2 = Tx.parse(tx.serialize(include_witness=False))
assert not tx_2.is_segwit()
assert tx_2 != tx
def test_tx_in() -> None:
tx_in = TxIn()
assert tx_in.prev_out == OutPoint()
assert tx_in.script_sig == b""
assert tx_in.sequence == 0
assert tx_in.outpoint == tx_in.prev_out
assert tx_in.scriptSig == tx_in.script_sig
assert tx_in.nSequence == tx_in.nSequence
assert tx_in.is_coinbase()
assert not tx_in.is_segwit()
tx_in2 = TxIn.parse(tx_in.serialize())
assert not tx_in2.is_segwit()
assert tx_in == tx_in2
tx_in2 = TxIn.from_dict(tx_in.to_dict())
assert not tx_in2.is_segwit()
assert tx_in == tx_in2
tx_id = "d5b5982254eebca64e4b42a3092a10bfb76ab430455b2bf0cf7c4f7f32db1c2e"
vout = 0
prev_out = OutPoint(tx_id, vout)
script_sig = b""
sequence = 0
tx_in = TxIn(prev_out, script_sig, sequence)
assert tx_in.prev_out == prev_out
assert tx_in.script_sig == script_sig
assert tx_in.sequence == sequence
assert tx_in.outpoint == tx_in.prev_out
assert tx_in.scriptSig == tx_in.script_sig
assert tx_in.nSequence == tx_in.nSequence
assert not tx_in.is_coinbase()
assert not tx_in.is_segwit()
tx_in2 = TxIn.parse(tx_in.serialize())
assert not tx_in2.is_segwit()
assert tx_in == tx_in2
tx_in2 = TxIn.from_dict(tx_in.to_dict())
assert not tx_in2.is_segwit()
assert tx_in == tx_in2
prev_out = OutPoint(
"9dcfdb5836ecfe146bdaa896605ba21222f83cd014dd47adde14fab2aba7de9b", 1
)
script_sig = b""
sequence = 0xFFFFFFFF
tx_in = TxIn(prev_out, script_sig, sequence)
stack = [
"",
"30440220421fbbedf2ee096d6289b99973509809d5e09589040d5e0d453133dd11b2f78a02205686dbdb57e0c44e49421e9400dd4e931f1655332e8d078260c9295ba959e05d01",
"30440220398f141917e4525d3e9e0d1c6482cb19ca3188dc5516a3a5ac29a0f4017212d902204ea405fae3a58b1fc30c5ad8ac70a76ab4f4d876e8af706a6a7b4cd6fa100f4401",
"52210375e00eb72e29da82b89367947f29ef34afb75e8654f6ea368e0acdfd92976b7c2103a1b26313f430c4b15bb1fdce663207659d8cac749a0e53d70eff01874496feff2103c96d495bfdd5ba4145e3e046fee45e84a8a48ad05bd8dbb395c011a32cf9f88053ae",
]
tx_in.script_witness = Witness(stack)
assert tx_in.prev_out == prev_out
assert tx_in.script_sig == script_sig
assert tx_in.sequence == sequence
assert tx_in.outpoint == tx_in.prev_out
assert tx_in.scriptSig == tx_in.script_sig
assert tx_in.nSequence == tx_in.nSequence
assert not tx_in.is_coinbase()
assert tx_in.is_segwit()
tx_in2 = TxIn.parse(tx_in.serialize())
assert not tx_in2.is_segwit()
assert tx_in == tx_in2 or TX_IN_COMPARES_WITNESS
tx_in2 = TxIn.from_dict(tx_in.to_dict())
assert tx_in2.is_segwit()
assert tx_in == tx_in2
assert tx_in != OutPoint()
tx_in.sequence = 0xFFFFFFFF + 1
with pytest.raises(BTClibValueError, match="invalid sequence: "):
tx_in.assert_valid()