def test_block_parsing_and_serialization(self):
tx_in = TxIn(
prev_tx=b'\x00' * 32,
prev_index=0xffffffff,
script_sig=Script([b'muhhh coinz']),
)
sk = create_sk(100)
sec = sk.verifying_key.to_sec(compressed=False)
tx_out = TxOut(
amount=50 * 100_000_000,
script_pubkey=p2pk_script(sec),
)
coinbase = Tx(
version=1,
tx_ins=[tx_in],
tx_outs=[tx_out],
locktime=0,
)
block = mine(
Block(version=1,
prev_block=genesis.hash(),
merkle_root=merkle_root([coinbase.hash()]),
timestamp=int(time.time()),
bits=starting_bits,
nonce=b'\x00\x00\x00\x00',
txns=[coinbase]))
assert Block.parse(BytesIO(block.serialize())).hash() == block.hash()
def spend_nonexistant_output(bitcoin_node):
coinbase = prepare_coinbase(bob_sec)
tx_in = TxIn(
prev_tx=urandom(32),
prev_index=0,
script_sig=p2pk_script(bob_sec),
)
tx_out = TxOut(
amount=50 * 100_000_000,
script_pubkey=p2pk_script(bob_sec),
)
bad_spend = Tx(
version=1,
tx_ins=[tx_in],
tx_outs=[tx_out],
locktime=0,
)
block = mine(
Block(
version=1,
prev_block=bitcoin_node.headers[-1].hash(),
merkle_root=merkle_root([coinbase.hash(),
bad_spend.hash()]), # FIXME
timestamp=int(time.time()),
bits=starting_bits,
nonce=b'\x00\x00\x00\x00',
txns=[coinbase, bad_spend],
))
valid = False
hints = make_hints([
'this transaction spends an output that does not exist',
])
# FIXME: check that utxo_set was updated
return block, valid, hints
def bad_coinbase(bitcoin_node):
# this scenario sucks b/c we test multiple things and it's unclear whether the latter
# checks are even happening
tx_in = TxIn(
prev_tx=b'\x00' * 32,
prev_index=0xffffffff,
script_sig=p2pk_script(urandom(10)),
)
tx_out = TxOut(
amount=100 * 100_000_000,
script_pubkey=p2pk_script(bob_sec),
)
coinbase = Tx(
version=1,
tx_ins=[tx_in],
tx_outs=[tx_out],
locktime=0,
)
block = mine(
Block(
version=1,
prev_block=bitcoin_node.headers[-1].hash(),
merkle_root=merkle_root([coinbase.hash()]), # FIXME
timestamp=int(time.time()),
bits=starting_bits,
nonce=b'\x00\x00\x00\x00',
txns=[coinbase]))
valid = False
hints = make_hints([
"Bad coinbase",
])
return block, valid, hints
def parse(cls, s):
block = BlockHeader.parse(s) # FIXME
# num_txns - varint
num_txns = read_varint(s)
# num_txns many transactions remain
block.txns = []
for _ in range(num_txns):
block.txns.append(Tx.parse(s))
return block
def first_valid_spend(bitcoin_node):
coinbase = prepare_coinbase(bob_sec)
assert len(list(bitcoin_node.utxo_set.keys())) == 1
outpoint = list(bitcoin_node.utxo_set.keys())[0] # FIXME
utxo = bitcoin_node.utxo_set[outpoint]
tx_in = TxIn(
prev_tx=bytes.fromhex(outpoint[0]),
prev_index=outpoint[1],
)
tx_out = TxOut(
amount=utxo.amount - 10,
script_pubkey=p2pk_script(bob_sec),
)
bad_spend = Tx(
version=1,
tx_ins=[tx_in],
tx_outs=[tx_out],
locktime=0,
)
### HACKS!!! ###
for i in range(len(bad_spend.tx_ins)):
bad_spend.sign_input(i, bob_sk, utxo.script_pubkey)
### /HACKS!!! ###
block = mine(
Block(
version=1,
prev_block=bitcoin_node.headers[-1].hash(),
merkle_root=merkle_root([coinbase.hash(),
bad_spend.hash()]), # FIXME
timestamp=int(time.time()),
bits=starting_bits,
nonce=b'\x00\x00\x00\x00',
txns=[coinbase, bad_spend],
))
valid = True
hints = make_hints([
'did utxo set update?',
])
# FIXME: check that utxo_set was updated
return block, valid, hints
def prepare_coinbase(sec):
tx_in = TxIn(
prev_tx=b'\x00' * 32,
prev_index=0xffffffff,
script_sig=p2pk_script(urandom(10)),
)
tx_out = TxOut(
amount=50 * 100_000_000,
script_pubkey=p2pk_script(sec),
)
return Tx(
version=1,
tx_ins=[tx_in],
tx_outs=[tx_out],
locktime=0,
)