def get_transactions(self):
"""Get one transaction per subaccount which includes at least one recovered utxo and it is
able to pay the fees"""
transactions = []
for subaccount_pointer in range((clargs.args.search_subaccounts or 0) +
1):
utxos = self.scan_subaccount(subaccount_pointer,
clargs.args.key_search_depth)
if not utxos:
continue
unblinded_utxos = [u for u in utxos if u.is_unblinded()]
if unblinded_utxos:
logging.warning('Found {} unblinded utxos.'.format(
len(unblinded_utxos)))
if not clargs.args.split_unblinded_inputs and unblinded_utxos:
logging.warning('You may want to create two transactions with '
'--split-unblinded-inputs')
utxo_sets = [utxos]
else:
utxos = [u for u in utxos if u not in unblinded_utxos]
utxo_sets = [utxos, unblinded_utxos]
for us in utxo_sets:
transaction, used_utxo = self.create_transaction(us)
if transaction:
signed_transaction = self.sign_transaction(
transaction, used_utxo)
transactions.append(signed_transaction)
if transactions:
self.test_transactions(transactions)
logging.debug('transactions: {}'.format(transactions))
flags = wally.WALLY_TX_FLAG_USE_WITNESS | wally.WALLY_TX_FLAG_USE_ELEMENTS
return [(wally.tx_from_hex(tx, flags), None) for tx in transactions]
def sign_tx(self, details):
txdetails = details['transaction']
utxos = txdetails['used_utxos'] or txdetails['old_used_utxos']
signatures = []
for index, utxo in enumerate(utxos):
wally_tx = wally.tx_from_hex(txdetails['transaction'],
wally.WALLY_TX_FLAG_USE_WITNESS)
is_segwit = utxo['script_type'] in [14, 15, 159, 162] # FIXME!!
if not is_segwit:
# FIXME
raise NotImplementedError("Non-segwit input")
flags = wally.WALLY_TX_FLAG_USE_WITNESS if is_segwit else 0
prevout_script = wally.hex_to_bytes(utxo['prevout_script'])
txhash = wally.tx_get_btc_signature_hash(wally_tx, index,
prevout_script,
utxo['satoshi'],
wally.WALLY_SIGHASH_ALL,
flags)
path = utxo['user_path']
privkey = self.get_privkey(path)
signature = wally.ec_sig_from_bytes(
privkey, txhash, wally.EC_FLAG_ECDSA | wally.EC_FLAG_GRIND_R)
signature = wally.ec_sig_to_der(signature)
signature.append(wally.WALLY_SIGHASH_ALL)
signatures.append(wally.hex_from_bytes(signature))
logging.debug('Signature (der) input %s path %s: %s', index, path,
signature)
return json.dumps({'signatures': signatures})
def parse_tx_file(file):
with file as f:
try:
return wally.tx_from_hex(
f.read().strip(), wally.WALLY_TX_FLAG_USE_WITNESS
| wally.WALLY_TX_FLAG_USE_ELEMENTS)
except ValueError:
err("Invalid transaction")
def sign_tx(self, details):
tx_flags = wally.WALLY_TX_FLAG_USE_WITNESS | wally.WALLY_TX_FLAG_USE_ELEMENTS
wally_tx = wally.tx_from_hex(details['transaction']['transaction'], tx_flags)
retval = {}
retval.update(self._get_blinding_factors(details['transaction'], wally_tx))
retval.update(self._sign_tx(details, wally_tx))
return json.dumps(retval)
def sign_transaction(transaction, used_utxos):
# TODO: use a wally_tx wrapper
flags = wally.WALLY_TX_FLAG_USE_WITNESS
tx = wally.tx_from_hex(transaction, flags)
# All sequence numbers must be set before signing
for index, u in enumerate(used_utxos):
u.set_csv_sequence(tx, index)
blockcount = get_current_blockcount() or 0
for index, u in enumerate(used_utxos):
assert u.is_expired(blockcount)
logging.debug('signing {}-th input'.format(index))
u.sign(tx, index)
logging.debug('signed tx: {}'.format(wally.tx_to_hex(tx, flags)))
return wally.tx_to_hex(tx, flags)
def get_transactions(self):
"""Get one transaction per subaccount which includes at least one recovered utxo and it is
able to pay the fees"""
transactions = []
for subaccount_pointer in range((clargs.args.search_subaccounts or 0) + 1):
utxos = self.scan_subaccount(subaccount_pointer, clargs.args.key_search_depth)
if len(utxos) == 0:
continue
transaction, used_utxo = self.create_transaction(utxos)
if transaction:
signed_transaction = self.sign_transaction(transaction, used_utxo)
transactions.append(signed_transaction)
if transactions:
self.test_transactions(transactions)
logging.debug('transactions: {}'.format(transactions))
flags = wally.WALLY_TX_FLAG_USE_WITNESS
return [(wally.tx_from_hex(transaction, flags), None) for transaction in transactions]
def get_utxos(self, outputs):
"""Get utxos from a list of possible outputs"""
core = bitcoincore.Connection(clargs.args)
version = core.getnetworkinfo()["version"]
if version < 180101:
raise BitcoinCoreConnectionError('Unsupported version')
# using a descriptor with CSV is not possible
scanobjects = [{'desc': 'addr({})'.format(o.address)} for o in outputs]
result = core.scantxoutset('start', scanobjects)
if not result['success']:
raise BitcoinCoreConnectionError('scantxoutset failed')
# add info for unblind
for u in result['unspents']:
blockhash = core.getblockhash(u['height'])
tx_hex = core.getrawtransaction(u['txid'], False, blockhash)
flags = wally.WALLY_TX_FLAG_USE_WITNESS | wally.WALLY_TX_FLAG_USE_ELEMENTS
tx = wally.tx_from_hex(tx_hex, flags)
u.update({
'address':
u['desc']
[5:-10], # stripping from "addr(<address>)#<8-char checksum>"
'noncecommitment':
b2h(wally.tx_get_output_nonce(tx, u['vout'])),
'rangeproof':
b2h(wally.tx_get_output_rangeproof(tx, u['vout'])),
})
# unblind and match keys with utxos
utxos = [
SpendableElementsUTXO(u, o, self.seed) for u in result['unspents']
for o in outputs if h2b(u['scriptPubKey']) == o.script_pubkey
]
logging.info('found {} utxos'.format(len(utxos)))
return utxos
import sys
import wallycore as wally
txmaker, address_taker, x, A, y, B, FEE, txidB, voutB, amountB, txidFEE, voutFEE, amountFEE = sys.argv[
1:]
x = float(x)
y = float(y)
amountB = float(amountB)
amountFEE = float(amountFEE)
voutB = int(voutB)
voutFEE = int(voutFEE)
#decode tx
tx = wally.tx_from_hex(txmaker, 3)
scriptpubkey = wally.address_to_scriptpubkey(
address_taker, wally.WALLY_NETWORK_LIQUID_REGTEST)
def h2b_rev(h):
return wally.hex_to_bytes(h)[::-1]
def btc2sat(btc):
return round(btc * 10**8)
def add_unblinded_output(tx_, script, asset, amount):
wally.tx_add_elements_raw_output(
tx_,
def from_hex(tx_hex):
return wally.tx_from_hex(tx_hex, wally.WALLY_TX_FLAG_USE_WITNESS)
def from_hex(tx_hex):
return wally.tx_from_hex(tx_hex.encode('ascii'),
wally.WALLY_TX_FLAG_USE_WITNESS)
def sign_tx(self, details):
tx_flags = wally.WALLY_TX_FLAG_USE_WITNESS
wally_tx = wally.tx_from_hex(details['transaction']['transaction'], tx_flags)
return json.dumps(self._sign_tx(details, wally_tx))
private_blinding_key = wally.asset_blinding_key_to_ec_private_key(
master_blinding_key, script_pubkey)
public_blinding_key = wally.ec_public_key_from_private_key(
private_blinding_key)
# end-derive_blinding_key
# start-create_conf_address
confidential_address = wally.confidential_addr_from_addr(
address, wally.WALLY_CA_PREFIX_LIQUID_REGTEST, public_blinding_key)
# end-create_conf_address
tx_hex = """\
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ae592043c1b640b15f5b6a9e3451ecabdb13c8f8076d6563630edfc4ccf46b2a72dbd16d8b62e221a7a0f7a5958fed6405bb6691b1443807a663bc4eba2d4cb44a97abfc446b28c62efc7f0b1dc191545b8ebdfa1bfee2ba596c1cee7150a96cd18882a23758fecafad405e033eb3a2093bfe6d62fec4ca2560a0000\
"""
# start-create_tx
tx = wally.tx_from_hex(
tx_hex, wally.WALLY_TX_FLAG_USE_ELEMENTS | wally.WALLY_TX_FLAG_USE_WITNESS)
# end-create_tx
# start-unblind
asset_generators_in = b''
asset_ids_in = b''
values_in = []
abfs_in = b''
vbfs_in = b''
script_pubkeys_in = []
vouts_in = []
num_outputs = wally.tx_get_num_outputs(tx)
for vout in range(num_outputs):
script_pubkey_out = wally.tx_get_output_script(tx, vout)
if script_pubkey_out != script_pubkey:
continue
def from_hex(cls, h: str, use_witness: bool = False):
flags = wally.WALLY_TX_FLAG_USE_WITNESS if use_witness else 0
try:
return cls(tx=wally.tx_from_hex(h, flags))
except ValueError:
raise InvalidTransaction
def main():
parser = argparse.ArgumentParser()
parser.add_argument(
"-n",
"--node-url",
help="Elements node URL, eg http://USERNAME:PASSWORD@HOST:PORT/",
required=True)
parser.add_argument("-u", "--utxo", help="txid:vout", required=True)
parser.add_argument("-a",
"--asset",
help="asset to receive",
required=True)
parser.add_argument("-r",
"--rate",
type=float,
help="price_asset_send/price_asset_receive",
required=True)
args = parser.parse_args()
txid, vout = args.utxo.split(":")
vout = int(vout)
asset_receive, rate = args.asset, args.rate
connection = RPCHost(args.node_url)
unspents = connection.call("listunspent")
utxo = [u for u in unspents if u["txid"] == txid and u["vout"] == vout][0]
amount_receive = round(rate * utxo["amount"], 8)
address = connection.call("getnewaddress")
tx = connection.call("createrawtransaction", [{
"txid": txid,
"vout": vout,
"sequence": 0xffffffff
}], {address: amount_receive}, 0, False, {address: asset_receive})
asset_blinder_bytes = os.urandom(32)
amount_blinder_bytes = os.urandom(32)
asset_commitment = wally.asset_generator_from_bytes(
h2b_rev(asset_receive), asset_blinder_bytes)
amount_commitment = wally.asset_value_commitment(btc2sat(amount_receive),
amount_blinder_bytes,
asset_commitment)
tx_ = wally.tx_from_hex(
tx, wally.WALLY_TX_FLAG_USE_WITNESS | wally.WALLY_TX_FLAG_USE_ELEMENTS)
wally.tx_set_output_asset(tx_, 0, asset_commitment)
wally.tx_set_output_value(tx_, 0, amount_commitment)
tx = wally.tx_to_hex(
tx_,
wally.WALLY_TX_FLAG_USE_WITNESS | wally.WALLY_TX_FLAG_USE_ELEMENTS)
ret = connection.call("signrawtransactionwithwallet", tx, None,
"SINGLE|ANYONECANPAY")
assert ret["complete"]
print(
json.dumps(
{
"tx":
ret["hex"],
"inputs": [{
"asset": utxo["asset"],
"amount": btc2sat(utxo["amount"]),
"asset_blinder": utxo["assetblinder"],
"amount_blinder": utxo["amountblinder"],
}],
"outputs": [{
"asset": asset_receive,
"amount": btc2sat(amount_receive),
"asset_blinder": b2h_rev(asset_blinder_bytes),
"amount_blinder": b2h_rev(amount_blinder_bytes),
}],
},
separators=(',', ':')))
