def from_bytes(b):
""" Creates a BlockHeader object from a serialized
bytestream. This function "eats" the bytestream and
returns the remainder of the stream after deserializing
the fields of the BlockHeader.
Args:
b (bytes): bytes beginning with the (4-byte) version.
Returns:
bh, b (tuple): A tuple containing two elements - a BlockHeader object
and the remainder of the bytestream after deserialization.
"""
version, b = unpack_u32(b)
prev_block_hash, b = Hash(b[0:32]), b[32:]
merkle_root_hash, b = Hash(b[0:32]), b[32:]
time, b = unpack_u32(b)
bits, b = unpack_u32(b)
nonce, b = unpack_u32(b)
return (
BlockHeader(version,
prev_block_hash,
merkle_root_hash,
time,
bits,
nonce),
b
)
def test_block(blocks_json):
for block_json in blocks_json:
# Why is it so f*ing hard to get a UNIX-time from a time string?
a = arrow.get(block_json['time'])
time = timegm(a.datetime.timetuple())
# TODO: Need to have a make_txn_from_json() method that's shared
# between here and test_txn()
txns = [txn_from_json(t) for t in block_json['transactions']]
# Create a new Block object
block = Block(block_json['height'], block_json['version'],
Hash(block_json['previous_block_hash']), time,
int(block_json['bits'], 16), block_json['nonce'], txns)
block_hash = block.hash
try:
assert len(block.txns) == len(block_json['transactions'])
assert block.height == block_json['height']
assert block.block_header.version == block_json['version']
assert block.block_header.prev_block_hash == Hash(
block_json['previous_block_hash'])
assert block.block_header.merkle_root_hash == Hash(
block_json['merkle_root'])
assert block.block_header.time == time
assert block.block_header.bits == int(block_json['bits'], 16)
assert block.block_header.nonce == block_json['nonce']
assert block_hash == Hash(block_json['hash'])
assert block.block_header.valid
except AssertionError as e:
print(e)
print("block height: %d" % (block.height))
print(" from json: %d" % (block_json['height']))
print(" version: %d" % (block.block_header.version))
print(" from json: %d" % (block_json['version']))
print(" prev_block_hash: %s" %
(block.block_header.prev_block_hash))
print(" from json: %s" %
(block_json['previous_block_hash']))
print(" merkle_root_hash: %s" %
(block.block_header.merkle_root_hash))
print(" from json: %s" % (block_json['merkle_root']))
print(" time: %d" % (block.block_header.time))
print(" from json: %d" % (time))
print(" bits: %d" % (block.block_header.bits))
print(" from json: %d" % (int(block_json['bits'], 16)))
print(" nonce: %d" % (block.block_header.nonce))
print(" from json: %d" % (block_json['nonce']))
raise
def _op_hash256(self):
""" The input is hashed two times with SHA-256.
"""
self._check_stack_len(1)
x = self._stack.pop()
self._stack.append(bytes(Hash.dhash(x)))
def hash(self):
""" Computes the hash of the transaction.
Returns:
dhash (bytes): Double SHA-256 hash of the serialized transaction.
"""
return Hash.dhash(bytes(self))
def hash(self):
""" Computes the double SHA-256 hash of the serialized object.
Returns:
Hash: object containing the hash
"""
return Hash.dhash(bytes(self))
def txn_from_json(txn_json):
inputs = []
for i in txn_json['inputs']:
if 'output_hash' in i:
outpoint = Hash(i['output_hash'])
script = Script(bytes.fromhex(i['script_signature_hex']))
# Do this to test script de/serialization
script._disassemble()
inp = TransactionInput(outpoint, i['output_index'], script,
i['sequence'])
else:
# Coinbase txn, we pass in a block version of 1 since the
# coinbase script from api.chain.com already has the
# height in there. Don't want our stuff to repack it in.
inp = CoinbaseInput(txn_json['block_height'],
bytes.fromhex(i['coinbase']), i['sequence'], 1)
inputs.append(inp)
outputs = []
for o in txn_json['outputs']:
scr = Script(bytes.fromhex(o['script_hex']))
scr._disassemble()
out = TransactionOutput(o['value'], scr)
outputs.append(out)
txn = Transaction(Transaction.DEFAULT_TRANSACTION_VERSION, inputs, outputs,
txn_json['lock_time'])
return txn
def hash(self):
""" Computes the double SHA-256 hash of the serialized object.
Returns:
Hash: object containing the hash
"""
return Hash.dhash(bytes(self))
def get_transactions(self, address_list, limit=100, min_block=None):
""" Provides transactions associated with each address in address_list.
Args:
address_list (list(str)): List of Base58Check encoded Bitcoin
addresses.
limit (int): Maximum number of transactions to return.
min_block (int): Block height from which to start getting
transactions. If None, will get transactions from the
entire blockchain.
Returns:
dict: A dict keyed by address with each value being a list of
Transaction objects.
"""
last_block_index = self.get_block_height()
ret = defaultdict(list)
total_items = limit
for addresses in self._list_chunks(address_list, 199):
fr = 0
to = min(100, limit)
while fr < total_items:
req = "addrs/" + ",".join(addresses) + \
"/txs?from=%d&to=%d" % (fr, to)
r = self._request("GET", req)
txn_data = r.json()
if "totalItems" in txn_data:
total_items = txn_data["totalItems"]
fr = txn_data["to"]
to = fr + 100
for data in txn_data['items']:
if "vin" not in data or "vout" not in data:
continue
block_hash = None
block = None
if data['confirmations'] > 0:
block = last_block_index - data['confirmations'] + 1
block_hash = Hash(data['blockhash'])
metadata = dict(block=block,
block_hash=block_hash,
network_time=data.get("time", None),
confirmations=data['confirmations'])
if min_block and block:
if block < min_block:
continue
txn, addr_keys = self.txn_from_json(data)
for addr in addr_keys:
if addr in addresses:
ret[addr].append(
dict(metadata=metadata, transaction=txn))
return ret
def get_transactions_by_id(self, ids):
""" Gets transactions by their IDs.
Args:
ids (list(str)): List of TXIDs to retrieve.
Returns:
dict: A dict keyed by TXID of Transaction objects.
"""
last_block_index = self.get_block_height()
ret = {}
for txid in ids:
r = self._request("GET", "tx/%s" % txid)
data = r.json()
if r.status_code == 200:
if "vin" not in data or "vout" not in data:
continue
block_hash = None
block = None
if data['confirmations'] > 0:
block = last_block_index - data['confirmations'] + 1
block_hash = Hash(data['blockhash'])
metadata = dict(block=block,
block_hash=block_hash,
network_time=data['time'],
confirmations=data['confirmations'])
txn, _ = self.txn_from_json(data)
assert str(txn.hash) == txid
ret[txid] = dict(metadata=metadata, transaction=txn)
return ret
def _op_hash256(self):
""" The input is hashed two times with SHA-256.
"""
self._check_stack_len(1)
x = self._stack.pop()
self._stack.append(bytes(Hash.dhash(x)))
def hash(self):
""" Computes the hash of the transaction.
Returns:
dhash (bytes): Double SHA-256 hash of the serialized transaction.
"""
return Hash.dhash(bytes(self))
def get_transactions_by_id(self, ids):
""" Gets transactions by their IDs.
Args:
ids (list): List of TXIDs to retrieve.
Returns:
dict: A dict keyed by TXID of Transaction objects.
"""
ret = {}
for txid in ids:
r = self._request("GET", "transactions/%s" % txid)
data = r.json()
if r.status_code == 200:
block_hash = None
if data['block_hash']:
block_hash = Hash(data['block_hash'])
metadata = dict(
block=data['block_height'],
block_hash=block_hash,
network_time=timegm(
arrow.get(
data['chain_received_at']).datetime.timetuple()),
confirmations=data['confirmations'])
txn, _ = self.txn_from_json(data)
assert str(txn.hash) == txid
ret[txid] = dict(metadata=metadata, transaction=txn)
return ret
def test_op_checklocktimeverify():
prev_txn_hash = Hash(
'6eae1e03964799c4e29039db459ea4fad4df57c2b06f730b60032a48fb075620')
txn_input = TransactionInput(prev_txn_hash, 0, Script(""), 1)
addr = "1HJiL6AYYmtkbJzC9bxAorznWijwNK5Z8E"
out_script_pub_key = Script.build_p2pkh(utils.address_to_key_hash(addr)[1])
txn_output = TransactionOutput(9000, out_script_pub_key)
# Create the txn
txn = Transaction(Transaction.DEFAULT_TRANSACTION_VERSION, [txn_input],
[txn_output], 367987)
# This is one more (367988) so it should fail
s = Script("0x749d05 OP_CHECKLOCKTIMEVERIFY")
si = ScriptInterpreter(txn=txn,
input_index=0,
sub_script=out_script_pub_key)
si.run_script(s)
assert not si.valid
# This is negative, so it should fail
s = Script("0xfff74d05 OP_CHECKLOCKTIMEVERIFY")
si = ScriptInterpreter(txn=txn,
input_index=0,
sub_script=out_script_pub_key)
si.run_script(s)
assert not si.valid
# This is one less (367986) so it should pass
s = Script("0x729d05 OP_CHECKLOCKTIMEVERIFY")
si = ScriptInterpreter(txn=txn,
input_index=0,
sub_script=out_script_pub_key)
si.run_script(s)
assert not si.stop
# Now reformulate the txn so that the input is finalized
txn_input.sequence_num = 0xffffffff
si.run_script(s)
assert not si.valid
# The last check is if there are mismatching notions of locktime
txn_input.sequence_num = 1
txn.lock_time = 500000001
si = ScriptInterpreter(txn=txn,
input_index=0,
sub_script=out_script_pub_key)
si.run_script(s)
assert not si.valid
def set_txn_side_effect_for_hd_discovery(self):
# For each used account, there are at least 2 calls required:
# 1 for the first DISCOVERY_INCREMENT payout addresses and 1
# for the first DISCOVERY_INCREMENT change
# addresses. Depending on the number of used addresses for the
# account, this will change.
effects = []
n = self._num_used_accounts
if n == 0:
n = 1
for acct_num in range(n):
for change in [0, 1]:
num_used = self._num_used_addresses[acct_num][change]
r = math.ceil((num_used + HDAccount.GAP_LIMIT) /
self.address_increment)
k = 'change_addresses' if change else 'payout_addresses'
addr_list = self._acct_keys[acct_num][k]
if change:
metadata = dict(block=234790 + r,
block_hash=Hash("000000000000000007d57f03ebe36dbe4f87ab2f340e93b45999ab249b6dc0df"),
confirmations=23890 - r)
else:
metadata = dict(block=None,
block_hash=None,
confirmations=0)
if r == 0:
r = 1
for i in range(r):
start = i * self.address_increment
end = (i + 1) * self.address_increment
addr_range = range(start, end)
out = TransactionOutput(value=100000,
script=Script.build_p2pkh(
address_to_key_hash(
addr_list[i])[1]))
dummy_txn = Transaction(1,
[],
[out],
0)
m = MockTxnDict(num_used=num_used,
addr_range=addr_range,
addr_list=addr_list,
used_value=[dict(metadata=metadata,
transaction=dummy_txn)],
unused_value=[])
effects.append(m)
self.get_transactions.side_effect = effects
return len(effects)
def _complete_merkle_edge(self):
if self._cb_txn is None:
# TODO: raise an error?
return
cur_hash = self._cb_txn.hash
for e in self.merkle_edge:
cur_hash = Hash.dhash(bytes(cur_hash) + bytes(e))
self.block_header.merkle_root_hash = cur_hash
def _complete_merkle_edge(self):
if self._cb_txn is None:
# TODO: raise an error?
return
cur_hash = self._cb_txn.hash
for e in self.merkle_edge:
cur_hash = Hash.dhash(bytes(cur_hash) + bytes(e))
self.block_header.merkle_root_hash = cur_hash
def __init__(self, height, version, prev_block_hash, time, bits, nonce, txns):
self.block_header = BlockHeader(version,
prev_block_hash,
Hash(bytes(32)), # Fake merkle_root for now
time,
bits,
nonce) # Fake nonce also
self.height = height
self.txns = txns
self.merkle_tree = None
self.invalidate()
def test_smallest_first():
utxos_by_addr = {}
addr_base = "1LQ1TjCKJN8GXsYtsqnREqs5Z4eaPCu5p"
h = Hash(
"a2972893f1be1f54d68a9228d9706ff8f202bb80f488f4dd46c0fe37c1e42415")
for i in range(10):
addr = addr_base + str(i)
utxos_by_addr[addr] = [
UnspentTransactionOutput(transaction_hash=h,
outpoint_index=random.randint(0, 10),
value=i * 20000,
scr=Script(""),
confirmations=10)
]
utxos = []
for addr, addr_utxos in utxos_by_addr.items():
utxos += addr_utxos
amount = 1000000
selected, fees = utxo_selector_smallest_first(utxos_by_addr=utxos_by_addr,
amount=amount,
num_outputs=2)
assert not selected
amount = 100000
selected, fees = utxo_selector_smallest_first(utxos_by_addr=utxos_by_addr,
amount=amount,
num_outputs=2)
sum_selected = 0
remaining = []
selected_list = []
for addr, utxo_list in selected.items():
sum_selected += sum([utxo.value for utxo in utxo_list])
selected_list += utxo_list
assert sum_selected >= amount
remaining = [u for u in utxos if u not in selected_list]
largest_selected = 0
for s in selected_list:
if s.value > largest_selected:
largest_selected = s.value
# Make sure that the largest of the selected is <= min(remaining)
assert remaining == [] or largest_selected <= min(
[u.value for u in remaining])
def mine_work(work_msg, enonce1, enonce2_size):
""" Mine the work using a CPU to find a valid solution.
Loop until the CPU finds a valid solution of the given work.
Todo:
Slow down the click echo when on a 21BC.
Args:
work_msg (WorkNotification): the work given by the pool API
enonce1 (bytes): extra nonce required to make the coinbase transaction
enonce2_size (int): size of the extra nonce 2 in bytes
"""
pool_target = utils.bits_to_target(work_msg.bits_pool)
for enonce2_num in range(0, 2**(enonce2_size * 8)):
enonce2 = enonce2_num.to_bytes(enonce2_size, byteorder="big")
cb_txn, _ = Transaction.from_bytes(work_msg.coinb1 + enonce1 +
enonce2 + work_msg.coinb2)
cb = CompactBlock(
work_msg.height,
work_msg.version,
Hash(work_msg.prev_block_hash),
work_msg.ntime,
work_msg.nbits, # lower difficulty work for testing
work_msg.merkle_edge,
cb_txn)
row_counter = 0
for nonce in range(0xffffffff):
if nonce % 6e3 == 0:
logger.info(click.style(u'█', fg='green'), nl=False)
row_counter += 1
if row_counter > 40:
row_counter = 0
logger.info("")
cb.block_header.nonce = nonce
h = cb.block_header.hash.to_int('little')
if h < pool_target:
share = Share(enonce2=enonce2,
nonce=nonce,
work_id=work_msg.work_id,
otime=int(time.time()))
# adds a new line at the end of progress bar
logger.info("")
return share
logger.info("Exhausted enonce1 space. Changing enonce2")
def __init__(self, height, version, prev_block_hash, time, bits, merkle_edge, cb_txn=None):
self.block_header = BlockHeader(version,
prev_block_hash,
Hash(bytes(32)), # Fake merkle_root for now
time,
bits,
0) # Fake nonce also
self.height = height
self.merkle_edge = merkle_edge
if cb_txn is not None:
self.coinbase_transaction = cb_txn
else:
self._cb_txn = None
def set_txn_side_effect_for_index(self, account_index, address_index,
change):
dummy_txn = Transaction(1, [], [], 0)
metadata = dict(block_height=234790,
block_hash=Hash("000000000000000007d57f03ebe36dbe4f87ab2f340e93b45999ab249b6dc0df"),
confirmations=23890)
k = 'change_addresses' if change else 'payout_addresses'
addr_list = self._acct_keys[account_index][k]
mtd = MockTxnDict(num_used=address_index + 1,
addr_range=range(address_index, address_index + 1),
addr_list=addr_list,
used_value=[dict(metadata=metadata,
transaction=dummy_txn)],
unused_value=[])
self.get_transactions.side_effect = [mtd]
def get_utxos(self, addresses, include_unconfirmed=False):
""" Returns a dict containing the UTXOs for the desired
addresses
Args:
addresses (list): List of addresses to get balances for
include_unconfirmed (bool): True if unconfirmed
transactions should be included in the balance.
Returns:
dict: Keys are addresses, values are lists of
UnspentTransactionOutput objects for the address.
"""
unconfirmed_mask = self.UNSPENT | self.UNCONFIRMED | self.PROVISIONAL
rv = {}
for addr in addresses:
# Get the list of unspent deposits.
if addr not in self._deposits_for_addr:
continue
for txid in self._deposits_for_addr[addr]:
for i in self._deposits_for_addr[addr][txid]:
# Look up the status in the outputs cache
if txid not in self._outputs_cache or \
i not in self._outputs_cache[txid]:
raise Exception("Don't have information for %r:%r" %
(txid, i))
status = self._outputs_cache[txid][i]['status']
if status & self.UNSPENT:
if (status & unconfirmed_mask and include_unconfirmed) or \
(status == self.UNSPENT and not include_unconfirmed):
out = self._outputs_cache[txid][i]['output']
utxo = UnspentTransactionOutput(
transaction_hash=Hash(txid),
outpoint_index=i,
value=out.value,
scr=out.script,
confirmations=self._txn_cache[txid].
confirmations)
if addr not in rv:
rv[addr] = []
rv[addr].append(utxo)
return rv
def _invalidate_coinbase(self, merkle_node=None):
if merkle_node is None:
merkle_node = self.merkle_tree
if(merkle_node.left_child is None and
merkle_node.right_child is None):
# This is the node corresponding to the coinbase, update hash
merkle_node.hash = self.coinbase_transaction.hash
return
else:
self._invalidate_coinbase(merkle_node.left_child)
merkle_node.hash = Hash.dhash(bytes(merkle_node.left_child.hash) +
bytes(merkle_node.right_child.hash))
# If we're back at the root, update the blockheader
if merkle_node is self.merkle_tree:
self.block_header.merkle_root_hash = self.merkle_tree.hash
def _invalidate_coinbase(self, merkle_node=None):
if merkle_node is None:
merkle_node = self.merkle_tree
if(merkle_node.left_child is None and
merkle_node.right_child is None):
# This is the node corresponding to the coinbase, update hash
merkle_node.hash = self.coinbase_transaction.hash
return
else:
self._invalidate_coinbase(merkle_node.left_child)
merkle_node.hash = Hash.dhash(bytes(merkle_node.left_child.hash) +
bytes(merkle_node.right_child.hash))
# If we're back at the root, update the blockheader
if merkle_node is self.merkle_tree:
self.block_header.merkle_root_hash = self.merkle_tree.hash
def get_transactions(self, address_list, limit=100, min_block=None):
""" Provides transactions associated with each address in address_list.
Args:
address_list (list): List of Base58Check encoded Bitcoin
addresses.
limit (int): Maximum number of transactions to return.
min_block (int): Block height from which to start getting
transactions. If None, will get transactions from the
entire blockchain.
Returns:
dict: A dict keyed by address with each value being a list of
Transaction objects.
"""
ret = defaultdict(list)
for addresses in self._list_chunks(address_list, 199):
path = "addresses/" + ",".join(addresses) \
+ "/transactions?limit={}".format(limit)
if min_block:
path += "&min_block={}".format(min_block)
r = self._request("GET", path)
txn_data = r.json()
for data in txn_data:
block_hash = None
if data['block_hash']:
block_hash = Hash(data['block_hash'])
metadata = dict(
block=data['block_height'],
block_hash=block_hash,
network_time=timegm(
arrow.get(
data['chain_received_at']).datetime.timetuple()),
confirmations=data['confirmations'])
txn, addr_keys = self.txn_from_json(data)
for addr in addr_keys:
if addr in addresses:
ret[addr].append(
dict(metadata=metadata, transaction=txn))
return ret
def _deserialize(wt_dict):
# Private, only for internal wallet usage
wt = WalletTransaction.from_hex(wt_dict['transaction'])
if 'metadata' in wt_dict:
m = wt_dict['metadata']
else:
m = wt_dict
wt.block = m['block']
if m['block_hash'] is not None:
wt.block_hash = Hash(m['block_hash'])
wt.confirmations = m['confirmations']
wt.network_time = m['network_time']
if 'value' in m:
wt.value = m['value']
if 'fees' in m:
wt.fees = m['fees']
if 'provisional' in m:
wt.provisional = m['provisional']
return wt
def get_signature_for_input(self, input_index, hash_type, private_key,
sub_script):
""" Returns the signature for an input.
This function only returns the signature for an input, it
does not insert the signature into the script member of
the input. It also does not validate that the given private key
matches any public keys in the sub_script.
Args:
input_index (int): The index of the input to sign.
hash_type (int): What kind of signature hash to do.
private_key (crypto.PrivateKey): private key with which
to sign the transaction.
sub_script (Script): the scriptPubKey of the corresponding
utxo being spent if the outpoint is P2PKH or the redeem
script if the outpoint is P2SH.
Returns:
tuple:
A tuple containing the signature object and the message that
was signed.
"""
if input_index < 0 or input_index >= len(self.inputs):
raise ValueError("Invalid input index.")
tmp_script = sub_script.remove_op("OP_CODESEPARATOR")
if hash_type & 0x1f == self.SIG_HASH_SINGLE and len(self.inputs) > len(self.outputs):
# This is to deal with the bug where specifying an index
# that is out of range (wrt outputs) results in a
# signature hash of 0x1 (little-endian)
msg_to_sign = 0x1.to_bytes(32, 'little')
else:
txn_copy = self._copy_for_sig(input_index, hash_type, tmp_script)
msg_to_sign = bytes(Hash.dhash(bytes(txn_copy) +
pack_u32(hash_type)))
sig = private_key.sign(msg_to_sign, False)
return sig, msg_to_sign
def _compute_merkle_tree(self):
""" Computes the merkle tree from the transactions in self.txns.
The merkle root is the top node in the tree and can be accessed as
self.merkle_tree.merkle_hash.
"""
# Tree gets built bottom up
level_nodes = [MerkleNode(t.hash, None, None) for t in self.txns]
while True:
if len(level_nodes) == 1:
self.merkle_tree = level_nodes[0] # This is the root
return
if len(level_nodes) % 2 != 0:
# Make sure there are an even number of nodes
level_nodes.append(level_nodes[-1])
new_level = []
for i in range(0, len(level_nodes), 2):
left = level_nodes[i]
right = level_nodes[i+1]
n = MerkleNode(Hash.dhash(bytes(left.hash) + bytes(right.hash)), left, right)
new_level.append(n)
level_nodes = new_level
def _compute_merkle_tree(self):
""" Computes the merkle tree from the transactions in self.transactions.
The merkle root is the top node in the tree and can be accessed as
self.merkle_tree.merkle_hash.
"""
# Tree gets built bottom up
level_nodes = [MerkleNode(t.hash, None, None) for t in self.txns]
while True:
if len(level_nodes) == 1:
self.merkle_tree = level_nodes[0] # This is the root
return
if len(level_nodes) % 2 != 0:
# Make sure there are an even number of nodes
level_nodes.append(level_nodes[-1])
new_level = []
for i in range(0, len(level_nodes), 2):
left = level_nodes[i]
right = level_nodes[i+1]
n = MerkleNode(Hash.dhash(bytes(left.hash) + bytes(right.hash)), left, right)
new_level.append(n)
level_nodes = new_level
def from_bytes(b):
""" Deserializes a byte stream into a TransactionInput.
Args:
b (bytes): byte stream starting with the outpoint.
Returns:
tuple:
First element of the tuple is the TransactionInput
object and the second is the remaining byte stream.
"""
outpoint = b[0:32]
outpoint_index, b1 = unpack_u32(b[32:])
script, b1 = Script.from_bytes(b1)
sequence_num, b1 = unpack_u32(b1)
return (
TransactionInput(Hash(outpoint),
outpoint_index,
script,
sequence_num),
b1
)
class CoinbaseInput(TransactionInput):
""" See https://bitcoin.org/en/developer-reference#coinbase
Args:
height (uint): The height of the block coinbase is part of
will go into. Not required for version 1
blocks.
raw_script (bytes): the bytes of the coinbase script. For
block_version > 1 the height portion
should NOT be included in this script.
sequence (int): Unless you are Satoshi with a version 1 block,
the default is fine. If you are Satoshi, send
me some of your private keys and set this to
0.
block_version (int): The version of the block this coinbase is
a part of or will go into. If raw_script
already contains the height of the block,
this must be 1.
"""
NULL_OUTPOINT = Hash(bytes(32))
MAX_INT = 0xffffffff
def __init__(self, height, raw_script, sequence=MAX_INT, block_version=3):
self.height = height
if block_version == 1:
scr = raw_script
else:
scr = Script.build_push_int(self.height) + raw_script
# Coinbase scripts are basically whatever, so we don't
# try to create a script object from them.
super().__init__(self.NULL_OUTPOINT,
self.MAX_INT,
scr,
sequence)
def get_addresses(self, testnet=False):
""" Returns all addresses associated with the script in this input.
Args:
testnet (bool): True if the transaction is a testnet transaction.
Returns:
list (str): A list of all addresses found in the script.
"""
return []
def __str__(self):
""" Returns a human readable formatting of this input.
Returns:
s (str): A string containing the human readable input.
"""
return (
"CoinbaseInput(" +
"Outpoint: %s " % (self.outpoint) +
"Outpoint Index: 0x%08x " % (self.outpoint_index) +
"Script: %s " % (bytes_to_str(self.script)) +
"Sequence: 0x%08x)" % (self.sequence_num))
def __bytes__(self):
""" Serializes the object into a byte stream.
Returns:
b (bytes): byte stream containing the serialized coinbase input.
"""
return (
bytes(self.outpoint) +
pack_u32(self.outpoint_index) +
pack_var_str(self.script) +
pack_u32(self.sequence_num)
)
def txn_from_json(txn_json):
""" Returns a new Transaction from a JSON-serialized transaction
Args:
txn_json:
JSON with the following format:
{
"hash": "0bf0de38c26195919179f...",
"block_hash": "000000000000000...",
"block_height": 303404,
"block_time": "2014-05-30T23:54:55Z",
"chain_received_at": "2015-08-13T10:52:21.718Z",
"confirmations": 69389,
"lock_time": 0,
"inputs": [
{
"transaction_hash": "0bf0de38c2619...",
"output_hash": "b84a66c46e24fe71f9...",
"output_index": 0,
"value": 300000,
"addresses": [
"3L7dKYQGNoZub928CJ8NC2WfrM8U8GGBjr"
],
"script_signature": "03046022100de7b67b9...",
"script_signature_hex": "00493046022100de7b...",
"sequence": 4294967295
}
],
"outputs": [
{
"transaction_hash": "0bf0de38c261959...",
"output_index": 0,
"value": 290000,
"addresses": [
"1K4nPxBMy6sv7jssTvDLJWk1ADHBZEoUVb"
],
"script": "OP_DUP OP_HASH160 c629680b8d...",
"script_hex": "76a914c629680b8d13...",
"script_type": "pubkeyhash",
"required_signatures": 1,
"spent": false,
"spending_transaction": null
}
],
"fees": 10000,
"amount": 290000
},
Transaction.DEFAULT_TRANSACTION_VERSION
Returns:
two1.bitcoin.Transaction:
a deserialized transaction derived
from the provided json.
"""
inputs = []
outputs = []
addr_keys = set()
for i in txn_json["inputs"]:
if 'coinbase' in i:
inputs.append(
CoinbaseInput(height=txn_json["block_height"] or 0,
raw_script=bytes.fromhex(i['coinbase']),
sequence=i['sequence'],
block_version=1))
else:
# Script length etc. are not returned so we need to
# prepend that.
script, _ = Script.from_bytes(
pack_var_str(bytes.fromhex(i["script_signature_hex"])))
inputs.append(
TransactionInput(Hash(i["output_hash"]), i["output_index"],
script, i["sequence"]))
if "addresses" in i:
addr_keys.add(i["addresses"][0])
for i in txn_json["outputs"]:
script, _ = Script.from_bytes(
pack_var_str(bytes.fromhex(i["script_hex"])))
outputs.append(TransactionOutput(i["value"], script))
if "addresses" in i:
addr_keys.add(i["addresses"][0])
txn = Transaction(Transaction.DEFAULT_TRANSACTION_VERSION, inputs,
outputs, txn_json["lock_time"])
return txn, addr_keys
def test_txns():
txn = WalletTransaction.from_hex(
'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'
) # nopep8
txn.block = 374440
txn.block_hash = Hash(
'0000000000000000038ee0066680705455d500f287f6c56db7a979c2426a4c02')
txn.confirmations = 7533
cm.insert_txn(txn)
txid = "3779f27a81cdbc435ac258ce5076c211e7a953027aab42573b1b7ce9e50abe8e"
assert txid in cm._txn_cache
in_addrs = [
"1DpCouKa2evX3f2aELUy7iNdsrYuLLaqWy",
"1GcmBmvYWJKLFHxrTtx5DqQLV7oHQAkH2c"
]
out_addrs = [("15qCydrcqURADXJHrtMW9m6SpPTa3kqkQb", 1000000),
("18VjAjZ7Au8U75LCHT7aH7mTwKETZwHTpi", 23264)]
assert len(cm._txns_by_addr.keys()) == 4
for i, a in enumerate(out_addrs):
assert a[0] in cm._txns_by_addr
assert list(cm._deposits_for_addr[a[0]][txid]) == [i]
for i, a in enumerate(in_addrs):
assert list(cm._spends_for_addr[a][txid]) == [i]
# Check input and output caches
assert txid in cm._inputs_cache
assert len(cm._inputs_cache[txid]) == 2
assert txid in cm._outputs_cache
assert len(cm._outputs_cache[txid]) == 2
assert cm._outputs_cache[txid][0]['output'] is not None
assert cm._outputs_cache[txid][1]['output'] is not None
assert cm._outputs_cache[txid][0]['status'] == CacheManager.UNSPENT
assert cm._outputs_cache[txid][1]['status'] == CacheManager.UNSPENT
out_txid1 = "5dea6d825656c7f1596a04e8911fc44d15fb8da41523bf058b0f78ec6506cb9c"
assert out_txid1 in cm._outputs_cache
assert cm._outputs_cache[out_txid1][0]['status'] == CacheManager.SPENT
out_txid2 = "27876849184950b3a0e937c631ee4ece6fbffeec3a02599d05b2350291cb2424"
assert out_txid2 in cm._outputs_cache
assert len(cm._outputs_cache[out_txid2].keys()) == 1
assert cm._outputs_cache[out_txid2][2]['status'] == CacheManager.SPENT
assert cm.has_txns()
assert cm.has_txns(0)
assert not cm.has_txns(1)
assert cm.have_transaction(txid)
assert not cm.have_transaction(out_txid1)
assert not cm.have_transaction(out_txid2)
assert cm.get_transaction(txid) == txn
assert cm.get_transaction(out_txid1) is None
assert cm.get_transaction(out_txid2) is None
# Check balances on addresses
addr_balances = cm.get_balances([a[0] for a in out_addrs])
for addr, exp_bal in out_addrs:
assert addr_balances[addr] == exp_bal
# Add a second transaction that deposits into addresses we have,
# but insert it as unconfirmed
txn_hex = "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" # nopep8
txn = WalletTransaction.from_hex(txn_hex)
cm.insert_txn(txn)
txid = "d24f3b9f0aa7b6484bcea563f4c254bd24e8163906cbffc727c2b2dad43af61e"
assert txid in cm._txn_cache
in_addrs = [
"1Ezv6YmYsZvALUaRcZRf8hBdxYni6cm78X",
"16Mcvb7fYhif94d1RHCn5AE2dm1oXCGnH6"
]
out_addrs = [("15hyvVXH2eJnakwhpqKBf5oTCa3o2bp8m8", 1000000),
("12m3fcaabUgYwWcodgVZUGH6ntFqVrHk5C", 204154)]
for i, a in enumerate(out_addrs):
assert a[0] in cm._txns_by_addr
assert list(cm._deposits_for_addr[a[0]][txid]) == [i]
for i, a in enumerate(in_addrs):
assert list(cm._spends_for_addr[a][txid]) == [i]
# Check input and output caches
assert txid in cm._inputs_cache
assert len(cm._inputs_cache[txid]) == 2
assert txid in cm._outputs_cache
assert cm._outputs_cache[txid][0]['output'] is not None
assert cm._outputs_cache[txid][1]['output'] is not None
assert cm._outputs_cache[txid][0][
'status'] == CacheManager.UNSPENT | CacheManager.UNCONFIRMED
assert cm._outputs_cache[txid][1][
'status'] == CacheManager.UNSPENT | CacheManager.UNCONFIRMED
out_txid1 = "5fcfa7cf78b53f78cc58a339da3ca4e7fe188cee2e24448e7558215a00cc9a8a"
assert out_txid1 in cm._outputs_cache
assert cm._outputs_cache[out_txid1][0][
'status'] == CacheManager.SPENT | CacheManager.UNCONFIRMED
out_txid2 = "305839bd673fbe08a0ee47014a6b9dcb3579bd74ffbc343d608f7758f17e8515"
assert out_txid2 in cm._outputs_cache
assert len(cm._outputs_cache[out_txid2].keys()) == 1
assert cm._outputs_cache[out_txid2][2][
'status'] == CacheManager.SPENT | CacheManager.UNCONFIRMED
# Check that confirmed balances are 0 for the out_addrs
out_a = [a[0] for a in out_addrs]
conf_addr_balances = cm.get_balances(out_a)
unconf_addr_balances = cm.get_balances(out_a, True)
for addr, exp_bal in out_addrs:
assert conf_addr_balances[addr] == 0
assert unconf_addr_balances[addr] == exp_bal
# Check utxos
conf_addr_utxos = cm.get_utxos(out_a)
unconf_addr_utxos = cm.get_utxos(out_a, True)
for addr, exp_bal in out_addrs:
assert addr not in conf_addr_utxos
assert addr in unconf_addr_utxos
assert len(unconf_addr_utxos[addr]) == 1
utxo = unconf_addr_utxos[addr][0]
assert utxo.value == exp_bal
assert utxo.num_confirmations == 0
# Reinsert the transaction with it as confirmed now
txn = WalletTransaction.from_hex(txn_hex)
txn.block = 374442
txn.block_hash = Hash(
'000000000000000001de250dcfa47f8313aec2f1f41a56f4fb0d099eb497c2b2')
txn.confirmations = 7684
cm.insert_txn(txn)
assert cm._outputs_cache[txid][0]['status'] == CacheManager.UNSPENT
assert cm._outputs_cache[txid][1]['status'] == CacheManager.UNSPENT
assert cm._outputs_cache[out_txid1][0]['status'] == CacheManager.SPENT
assert cm._outputs_cache[out_txid2][2]['status'] == CacheManager.SPENT
# Check the balances again
conf_addr_balances = cm.get_balances(out_a)
unconf_addr_balances = cm.get_balances(out_a, True)
for addr, exp_bal in out_addrs:
assert conf_addr_balances[addr] == exp_bal
assert unconf_addr_balances[addr] == exp_bal
# Check utxos again
conf_addr_utxos = cm.get_utxos(out_a)
unconf_addr_utxos = cm.get_utxos(out_a, True)
for addr, exp_bal in out_addrs:
assert addr in conf_addr_utxos
assert addr in unconf_addr_utxos
assert len(conf_addr_utxos[addr]) == 1
assert len(unconf_addr_utxos[addr]) == 1
utxo = conf_addr_utxos[addr][0]
assert utxo.value == exp_bal
assert utxo.num_confirmations == 7684
# Insert a transaction that spends from one of the out addrs in
# the above transactions.
# 1. Insert it provisionally
# 2. Re-insert as unconfirmed
# 3. Re-insert as confirmed
txn_hex = "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" # nopep8
txn = WalletTransaction.from_hex(txn_hex)
# First test with a very short expiration
cm.insert_txn(txn, mark_provisional=True, expiration=1)
txid = "6fd3c96d466cd465b40e59be14d023c27f1d0ca13075119d3d6baeebfc587b8c"
assert txid in cm._txn_cache
assert cm._txn_cache[txid].provisional
time.sleep(1.5)
cm.prune_provisional_txns()
assert txid not in cm._txn_cache
# Now do default expiration
cm.insert_txn(txn, mark_provisional=True)
assert txid in cm._txn_cache
in_addrs = [
"15hyvVXH2eJnakwhpqKBf5oTCa3o2bp8m8",
"15qCydrcqURADXJHrtMW9m6SpPTa3kqkQb"
]
out_addrs = [("1EbnoKrmUEe3hsK9gTVfgYAming6BuqM3L", 1000000),
("1BbPtYsbBPFRCwnU5RuMTttraghXQ5JSZm", 996600)]
for i, a in enumerate(out_addrs):
assert a[0] in cm._txns_by_addr
assert list(cm._deposits_for_addr[a[0]][txid]) == [i]
for i, a in enumerate(in_addrs):
assert list(cm._spends_for_addr[a][txid]) == [i]
# Check input and output caches
assert txid in cm._inputs_cache
assert len(cm._inputs_cache[txid]) == 2
assert txid in cm._outputs_cache
assert cm._outputs_cache[txid][0]['output'] is not None
assert cm._outputs_cache[txid][1]['output'] is not None
assert cm._outputs_cache[txid][0][
'status'] == CacheManager.UNSPENT | CacheManager.PROVISIONAL | CacheManager.UNCONFIRMED # nopep8
assert cm._outputs_cache[txid][1][
'status'] == CacheManager.UNSPENT | CacheManager.PROVISIONAL | CacheManager.UNCONFIRMED # nopep8
out_txid1 = "d24f3b9f0aa7b6484bcea563f4c254bd24e8163906cbffc727c2b2dad43af61e"
assert out_txid1 in cm._outputs_cache
assert cm._outputs_cache[out_txid1][0][
'status'] == CacheManager.SPENT | CacheManager.PROVISIONAL | CacheManager.UNCONFIRMED # nopep8
out_txid2 = "3779f27a81cdbc435ac258ce5076c211e7a953027aab42573b1b7ce9e50abe8e"
assert out_txid2 in cm._outputs_cache
assert len(cm._outputs_cache[out_txid2].keys()) == 2
assert cm._outputs_cache[out_txid2][0][
'status'] == CacheManager.SPENT | CacheManager.PROVISIONAL | CacheManager.UNCONFIRMED # nopep8
# Check that confirmed balances are 0 for the out_addrs
out_a = [a[0] for a in out_addrs]
conf_addr_balances = cm.get_balances(out_a)
unconf_addr_balances = cm.get_balances(out_a, True)
for addr, exp_bal in out_addrs:
assert conf_addr_balances[addr] == 0
assert unconf_addr_balances[addr] == exp_bal
# Check utxos
conf_addr_utxos = cm.get_utxos(out_a)
unconf_addr_utxos = cm.get_utxos(out_a, True)
for addr, exp_bal in out_addrs:
assert addr not in conf_addr_utxos
assert addr in unconf_addr_utxos
assert len(unconf_addr_utxos[addr]) == 1
utxo = unconf_addr_utxos[addr][0]
assert utxo.value == exp_bal
assert utxo.num_confirmations == 0
# Re-insert as unconfirmed
txn = WalletTransaction.from_hex(txn_hex)
cm.insert_txn(txn, mark_provisional=False)
# Only the statuses should change, so check those.
assert cm._outputs_cache[txid][0][
'status'] == CacheManager.UNSPENT | CacheManager.UNCONFIRMED
assert cm._outputs_cache[txid][1][
'status'] == CacheManager.UNSPENT | CacheManager.UNCONFIRMED
assert cm._outputs_cache[out_txid1][0][
'status'] == CacheManager.SPENT | CacheManager.UNCONFIRMED
assert cm._outputs_cache[out_txid2][0][
'status'] == CacheManager.SPENT | CacheManager.UNCONFIRMED
# Re-insert as confirmed
txn = WalletTransaction.from_hex(txn_hex)
txn.block = 374445
txn.block_hash = Hash(
"000000000000000004c241778cbbc269e912df5fe8d856efaea916daa82d2575")
txn.confirmations = 7781
cm.insert_txn(txn, mark_provisional=False)
# Only the statuses should change, so check those.
assert cm._outputs_cache[txid][0]['status'] == CacheManager.UNSPENT
assert cm._outputs_cache[txid][1]['status'] == CacheManager.UNSPENT
assert cm._outputs_cache[out_txid1][0]['status'] == CacheManager.SPENT
assert cm._outputs_cache[out_txid2][0]['status'] == CacheManager.SPENT
# Check balances
out_a = [a[0] for a in out_addrs]
conf_addr_balances = cm.get_balances(out_a)
unconf_addr_balances = cm.get_balances(out_a, True)
for addr, exp_bal in out_addrs:
assert conf_addr_balances[addr] == exp_bal
assert unconf_addr_balances[addr] == exp_bal
# Check utxos
conf_addr_utxos = cm.get_utxos(out_a)
unconf_addr_utxos = cm.get_utxos(out_a, True)
for addr, exp_bal in out_addrs:
assert addr in conf_addr_utxos
assert addr in unconf_addr_utxos
assert len(unconf_addr_utxos[addr]) == 1
utxo = conf_addr_utxos[addr][0]
assert utxo.value == exp_bal
assert utxo.num_confirmations == 7781
# Check utxos for all addresses that have deposits - we should only have 4
addrs = [
"1DpCouKa2evX3f2aELUy7iNdsrYuLLaqWy",
"1GcmBmvYWJKLFHxrTtx5DqQLV7oHQAkH2c",
"15hyvVXH2eJnakwhpqKBf5oTCa3o2bp8m8",
"15qCydrcqURADXJHrtMW9m6SpPTa3kqkQb",
"1EbnoKrmUEe3hsK9gTVfgYAming6BuqM3L",
"1BbPtYsbBPFRCwnU5RuMTttraghXQ5JSZm",
"1Ezv6YmYsZvALUaRcZRf8hBdxYni6cm78X",
"16Mcvb7fYhif94d1RHCn5AE2dm1oXCGnH6",
"12m3fcaabUgYwWcodgVZUGH6ntFqVrHk5C",
"18VjAjZ7Au8U75LCHT7aH7mTwKETZwHTpi"
]
conf_utxos = cm.get_utxos(addrs)
assert len(conf_utxos) == 4
utxo_addrs_values = [("18VjAjZ7Au8U75LCHT7aH7mTwKETZwHTpi", 23264),
("12m3fcaabUgYwWcodgVZUGH6ntFqVrHk5C", 204154),
("1EbnoKrmUEe3hsK9gTVfgYAming6BuqM3L", 1000000),
("1BbPtYsbBPFRCwnU5RuMTttraghXQ5JSZm", 996600)]
for a, value in utxo_addrs_values:
assert a in conf_utxos
assert len(conf_utxos[a]) == 1
assert conf_utxos[a][0].value == value
assert "15hyvVXH2eJnakwhpqKBf5oTCa3o2bp8m8" not in conf_utxos
assert "15qCydrcqURADXJHrtMW9m6SpPTa3kqkQb" not in conf_utxos
# Now delete the last transaction
cm._delete_txn(txid)
assert txid not in cm._txn_cache
assert txid not in cm._inputs_cache
assert txid not in cm._outputs_cache
for in_addr in in_addrs:
assert in_addr not in cm._spends_for_addr
for out_addr, _ in out_addrs:
assert out_addr not in cm._deposits_for_addr
for out_txid, index in [(out_txid1, 0), (out_txid2, 0)]:
out = cm._outputs_cache[out_txid][index]
assert out['status'] == CacheManager.UNSPENT
assert out['spend_txid'] is None
assert out['spend_index'] is None
def txn_from_json(txn_json):
""" Returns a new Transaction from a JSON-serialized transaction
Args:
txn_json: JSON with the following format:
{
"hash": "0bf0de38c26195919179f...",
"block_hash": "000000000000000...",
"block_height": 303404,
"block_time": "2014-05-30T23:54:55Z",
"chain_received_at": "2015-08-13T10:52:21.718Z",
"confirmations": 69389,
"lock_time": 0,
"inputs": [
{
"transaction_hash": "0bf0de38c2619...",
"output_hash": "b84a66c46e24fe71f9...",
"output_index": 0,
"value": 300000,
"addresses": [
"3L7dKYQGNoZub928CJ8NC2WfrM8U8GGBjr"
],
"script_signature": "03046022100de7b67b9...",
"script_signature_hex": "00493046022100de7b...",
"sequence": 4294967295
}
],
"outputs": [
{
"transaction_hash": "0bf0de38c261959...",
"output_index": 0,
"value": 290000,
"addresses": [
"1K4nPxBMy6sv7jssTvDLJWk1ADHBZEoUVb"
],
"script": "OP_DUP OP_HASH160 c629680b8d...",
"script_hex": "76a914c629680b8d13...",
"script_type": "pubkeyhash",
"required_signatures": 1,
"spent": false,
"spending_transaction": null
}
],
"fees": 10000,
"amount": 290000
},
Transaction.DEFAULT_TRANSACTION_VERSION
Returns:
two1.bitcoin.Transaction: a deserialized transaction derived
from the provided json.
"""
inputs = []
outputs = []
addr_keys = set()
for i in sorted(txn_json["vin"], key=lambda i: i["n"]):
if 'coinbase' in i:
inputs.append(
CoinbaseInput(height=0,
raw_script=bytes.fromhex(i['coinbase']),
sequence=i['sequence'],
block_version=1))
else:
script = Script.from_hex(i["scriptSig"]["hex"])
inputs.append(
TransactionInput(Hash(i["txid"]), i["vout"], script,
i["sequence"]))
if "addr" in i:
addr_keys.add(i["addr"])
for o in sorted(txn_json["vout"], key=lambda o: o["n"]):
script = Script.from_hex(o["scriptPubKey"]["hex"])
value = int(
decimal.Decimal(str(o["value"])) * decimal.Decimal('1e8'))
outputs.append(TransactionOutput(value, script))
if "addresses" in o["scriptPubKey"]:
for a in o["scriptPubKey"]["addresses"]:
addr_keys.add(a)
txn = Transaction(Transaction.DEFAULT_TRANSACTION_VERSION, inputs,
outputs, txn_json["locktime"])
assert txn.hash == Hash(txn_json['txid'])
return txn, addr_keys
