def close_tx(self, fee: int, privkey_dest: str) -> str:
"""Create a (mutual) close tx"""
txin = CTxIn(COutPoint(bytes.fromhex(self.txid), self.output_index))
out_privkey = privkey_expand(privkey_dest)
txout = CTxOut(self.amount - fee,
CScript([script.OP_0,
Hash160(coincurve.PublicKey.from_secret(out_privkey.secret).format())]))
tx = CMutableTransaction(vin=[txin], vout=[txout])
sighash = script.SignatureHash(self.redeemscript(), tx, inIdx=0,
hashtype=script.SIGHASH_ALL,
amount=self.amount,
sigversion=script.SIGVERSION_WITNESS_V0)
sigs = [key.sign(sighash, hasher=None) for key in self.funding_privkeys_for_tx()]
# BOLT #3:
# ## Closing Transaction
# ...
# * `txin[0]` witness: `0 <signature_for_pubkey1> <signature_for_pubkey2>`
witness = CScriptWitness([bytes(),
sigs[0] + bytes([script.SIGHASH_ALL]),
sigs[1] + bytes([script.SIGHASH_ALL]),
self.redeemscript()])
tx.wit = CTxWitness([CTxInWitness(witness)])
return tx.serialize().hex()
def as_tx(self):
sum_in = sum(prevtx.nValue for _, prevtx, _ in self.prevouts)
sig_size = sum(redeemer.spendbytes for _, _, redeemer in self.prevouts)
tx_size = (
4 + # version field
2 + # # of txins
len(self.prevouts) * 41 + # txins, excluding sigs
sig_size + # txins, sigs only
1 + # # of txouts
34 + # txout
4 # nLockTime field
)
feerate = int(self.proxy._call('estimatefee', 1) * COIN)
# satoshi's per KB
if feerate <= 0:
feerate = 10000
fees = int(tx_size * feerate / 1000)
tx = CMutableTransaction(
[CTxIn(outpoint, nSequence=0) for outpoint, _, _ in self.prevouts],
[CTxOut(sum_in - fees, self.payto.to_scriptPubKey())], 0)
for n, (_, _, redeemer) in enumerate(self.prevouts):
redeemer.mutate_spend(tx, n)
unsigned_tx = CTransaction.from_tx(tx)
for n, (_, _, redeemer) in enumerate(self.prevouts):
txin = CMutableTxIn.from_txin(tx.vin[n])
txin.scriptSig = redeemer.sign_spend(unsigned_tx, n)
tx.vin[n] = CTxIn.from_txin(txin)
print(b2x(tx.serialize()))
def open_channel(self, my_money, their_money, fees, their_coins,
their_change, their_pubkey, their_addr):
"""Respond to a requested open."""
assert self.state == 'begin'
# Get inputs and change output
coins, change = self.select_coins(my_money + 2 * fees)
# Make the anchor script
anchor_output_script = self.anchor_script(self.private_key.pub,
their_pubkey)
# Construct the anchor utxo
payment = CMutableTxOut(my_money + their_money + 2 * fees,
anchor_output_script.to_p2sh_scriptPubKey())
# Anchor tx
transaction = CMutableTransaction(their_coins + coins,
[payment, change, their_change])
# Half-sign
transaction = self.bitcoind.signrawtransaction(transaction)['tx']
# Create channel in DB
self.anchor.prevout = CMutableOutPoint(transaction.GetHash(), 0)
self.anchor.scriptSig = AnchorScriptSig(0, b'', anchor_output_script)
self.our.nValue = my_money
self.our.scriptPubKey = self.bitcoind.getnewaddress()
self.their.nValue = their_money
self.their.scriptPubKey = their_addr
# Event: channel opened
channel_opened.send(self.cmd_id, address=self.address)
self.bob.open_accept(transaction, anchor_output_script,
self.our.scriptPubKey)
self.state = 'open_wait_1.5'
def open_channel(address, mymoney, theirmoney, fees, their_coins, their_change,
their_pubkey, their_out_addr): # pylint: disable=too-many-arguments, line-too-long
"""Open a payment channel."""
# Get inputs and change output
coins, change = select_coins(mymoney + 2 * fees)
# Make the anchor script
anchor_output_script = anchor_script(get_pubkey(), their_pubkey)
# Construct the anchor utxo
payment = CMutableTxOut(mymoney + theirmoney + 2 * fees,
anchor_output_script.to_p2sh_scriptPubKey())
# Anchor tx
transaction = CMutableTransaction(their_coins + coins,
[payment, change, their_change])
# Half-sign
transaction = g.bit.signrawtransaction(transaction)['tx']
# Create channel in DB
our_addr = g.bit.getnewaddress()
channel = Channel(
address=address,
anchor_point=COutPoint(transaction.GetHash(), 0),
anchor_index=0,
their_sig=b'',
anchor_redeem=anchor_output_script,
our_balance=mymoney,
our_addr=our_addr,
their_balance=theirmoney,
their_addr=their_out_addr,
)
database.session.add(channel)
database.session.commit()
# Event: channel opened
CHANNEL_OPENED.send('channel', address=address)
return (transaction, anchor_output_script, our_addr)
def refund(proxy, refundGuy, contract):
redeemScript = CScript(x(contract['redeemScript']))
txin = CMutableTxIn(fundtx['outpoint'])
txout = CMutableTxOut(fundtx['amount'] - FEE,
refundGuy['addr'].to_scriptPubKey())
tx = CMutableTransaction([txin], [txout])
txin.nSequence = 0
tx.nLockTime = contract['redeemblocknum']
sighash = SignatureHash(redeemScript, tx, 0, SIGHASH_ALL)
sig = refundGuy['key'].sign(sighash) + bytes([SIGHASH_ALL])
txin.scriptSig = CScript([sig, refundGuy['key'].pub, OP_FALSE, redeemScript])
txin_scriptPubKey = redeemScript.to_p2sh_scriptPubKey()
print('Raw redeem transaction hex: {0}'.format(b2x(tx.serialize())))
res = VerifyScript(txin.scriptSig, txin_scriptPubKey,
tx, 0, (SCRIPT_VERIFY_P2SH,))
print("Script verified, sending raw transaction... (NOT)", res)
txid = proxy.sendrawtransaction(tx)
refund_tx = b2x(lx(b2x(txid)))
fund_tx = str(fundtx['outpoint'])
return {"refund_tx": refund_tx, "fund_tx": fund_tx}
def spend_p2sh_mediator(redeemScript, txins_str, amounts, daddrs, sig, rein):
txin_redeemScript = CScript(x(redeemScript))
txin_scriptPubKey = txin_redeemScript.to_p2sh_scriptPubKey()
txins_obj = []
for txin_str in txins_str.split():
txin_list = txin_str.split("-")
txins_obj.append(
CMutableTxIn(COutPoint(lx(txin_list[0]), int(txin_list[1]))))
txouts = []
len_amounts = len(amounts)
for i in range(0, len_amounts):
txouts.append(
CMutableTxOut(
round(amounts[i], 8) * COIN,
CBitcoinAddress(daddrs[i]).to_scriptPubKey()))
tx = CMutableTransaction(txins_obj, txouts)
seckey = CBitcoinSecret(rein.user.dkey)
ntxins = len(txins_obj)
sig_list = []
for s in sig.split():
sig_list.append(x(s))
sig2_str = ""
for i in range(0, ntxins):
sighash = SignatureHash(txin_redeemScript, tx, i, SIGHASH_ALL)
sig2 = seckey.sign(sighash) + x("01")
sig2_str += " " + b2x(sig2)
txins_obj[i].scriptSig = CScript(
[OP_0, sig2, sig_list[i], txin_redeemScript])
VerifyScript(txins_obj[i].scriptSig, txin_scriptPubKey, tx, i,
(SCRIPT_VERIFY_P2SH, ))
tx_bytes = tx.serialize()
hash = sha256(sha256(tx_bytes).digest()).digest()
txid = b2x(hash[::-1])
txid_causeway = broadcast_tx(b2x(tx_bytes), rein)
return (txid, sig2_str[1:])
def redeem(proxy, redeemerGuy, contract, fundtx, secret):
print('redeemPubKey', redeemerGuy['addr'])
# TODO: Compare with script on blockchain?
redeemScript = CScript(x(contract['redeemScript']))
txin = CMutableTxIn(fundtx['outpoint'])
txout = CMutableTxOut(fundtx['amount'] - FEE,
redeemerGuy['addr'].to_scriptPubKey())
# Create the unsigned raw transaction.
tx = CMutableTransaction([txin], [txout])
sighash = SignatureHash(redeemScript, tx, 0, SIGHASH_ALL)
# TODO: protect privkey better, separate signing from rawtx creation
#privkey = self.bitcoind.dumpprivkey(self.redeemPubKey)
sig = redeemerGuy['key'].sign(sighash) + bytes([SIGHASH_ALL])
preimage = secret.encode('utf-8')
# preimage = x(secret)
txin.scriptSig = CScript([sig, redeemerGuy['key'].pub, preimage,
OP_TRUE, redeemScript])
# print("txin.scriptSig", b2x(txin.scriptSig))
txin_scriptPubKey = redeemScript.to_p2sh_scriptPubKey()
print('Raw redeem transaction hex: ', b2x(tx.serialize()))
VerifyScript(txin.scriptSig, txin_scriptPubKey,
tx, 0, (SCRIPT_VERIFY_P2SH,))
print("Script verified, sending raw transaction...")
txid = proxy.sendrawtransaction(tx)
fund_tx = str(fundtx['outpoint'])
redeem_tx = b2x(lx(b2x(txid)))
return {"redeem_tx": redeem_tx, "fund_tx": fund_tx}
def as_tx(self):
sum_in = sum(prevtx.nValue for _,prevtx,_ in self.prevouts)
sig_size = sum(redeemer.spendbytes for _,_,redeemer in self.prevouts)
tx_size = (4 + # version field
2 + # # of txins
len(self.prevouts) * 41 + # txins, excluding sigs
sig_size + # txins, sigs only
1 + # # of txouts
34 + # txout
4 # nLockTime field
)
feerate = int(self.proxy._call('estimatefee', 1) * COIN)
# satoshi's per KB
if feerate <= 0:
feerate = 10000
fees = int(tx_size * feerate / 1000)
tx = CMutableTransaction(
[CTxIn(outpoint, nSequence=0)
for outpoint,_,_ in self.prevouts],
[CTxOut(sum_in - fees, self.payto.to_scriptPubKey())],
0)
for n,(_,_,redeemer) in enumerate(self.prevouts):
redeemer.mutate_spend(tx, n)
unsigned_tx = CTransaction.from_tx(tx)
for n,(_,_,redeemer) in enumerate(self.prevouts):
txin = CMutableTxIn.from_txin(tx.vin[n])
txin.scriptSig = redeemer.sign_spend(unsigned_tx, n)
tx.vin[n] = CTxIn.from_txin(txin)
print(b2x(tx.serialize()))
def main():
''' Our main function. '''
SelectParams('mainnet')
decoded_transaction = eval(open('transaction_to_sign.txt').read()) # pylint: disable=eval-used
txin_txid = lx(decoded_transaction['vin'][0]['txid'])
txin_vout = 0
tx_in = CMutableTxIn(COutPoint(txin_txid, txin_vout))
tx_out = []
for idx in range(len(decoded_transaction['vout'])):
satoshis = int(COIN * decoded_transaction['vout'][idx]['value'])
script_pub_key = CScript(bytes.fromhex(decoded_transaction['vout'][idx]['scriptPubKey']['hex']))
tx_out.append(CMutableTxOut(satoshis, script_pub_key))
tx_to_spend = CMutableTransaction([tx_in], tx_out)
priv_1 = CBitcoinSecret.from_secret_bytes(bytes.fromhex(PRIV_HEX_1))
priv_2 = CBitcoinSecret.from_secret_bytes(bytes.fromhex(PRIV_HEX_2))
txin_redeem_script = CScript(bytes.fromhex(decoded_transaction['vin'][0]['scriptSig']['hex']))
# Input 0 is fixed.
sighash = SignatureHash(txin_redeem_script, tx_to_spend, 0, SIGHASH_ALL)
signatures = []
for priv in [priv_1, priv_2]:
signatures.append(priv.sign(sighash) + bytes([SIGHASH_ALL]))
tx_in.scriptSig = CScript([CScriptOp(0x00), signatures[0], signatures[1], txin_redeem_script])
# script_pub_key Defined in cycle.
VerifyScript(tx_in.scriptSig, txin_redeem_script, tx_to_spend, 0, (SCRIPT_VERIFY_P2SH,))
print(b2x(tx_to_spend.serialize()))
def refund(self, contract):
fundtx = self.find_transaction_to_address(contract.p2sh)
print("Fund tx found in refund: ", fundtx)
refundPubKey = self.find_refundAddr(contract)
print('refundPubKey: {0}'.format(refundPubKey))
redeemScript = CScript(x(contract.redeemScript))
txin = CMutableTxIn(fundtx['outpoint'])
txout = CMutableTxOut(fundtx['amount'] - FEE,
refundPubKey.to_scriptPubKey())
# Create the unsigned raw transaction.
tx = CMutableTransaction([txin], [txout])
# Set nSequence and nLockTime
txin.nSequence = 0
tx.nLockTime = contract.redeemblocknum
sighash = SignatureHash(redeemScript, tx, 0, SIGHASH_ALL)
privkey = self.bitcoind.dumpprivkey(refundPubKey)
sig = privkey.sign(sighash) + bytes([SIGHASH_ALL])
# Sign without secret
txin.scriptSig = CScript([sig, privkey.pub, OP_FALSE, redeemScript])
# txin.nSequence = 2185
txin_scriptPubKey = redeemScript.to_p2sh_scriptPubKey()
print('Raw redeem transaction hex: {0}'.format(b2x(tx.serialize())))
res = VerifyScript(txin.scriptSig, txin_scriptPubKey,
tx, 0, (SCRIPT_VERIFY_P2SH,))
print("Script verified, sending raw transaction... (NOT)", res)
txid = self.bitcoind.sendrawtransaction(tx)
refund_tx = b2x(lx(b2x(txid)))
fund_tx = str(fundtx['outpoint'])
return {"refund_tx": refund_tx, "fund_tx": fund_tx}
def test_emergency_txout(bitcoind):
"""Test mostly the emergency tx locktime"""
amount = Decimal("50") - Decimal("500") / Decimal(COIN)
privkeys = [CKey(os.urandom(32)) for _ in range(4)]
pubkeys = [k.pub for k in privkeys]
txo = emergency_txout(pubkeys, COIN * amount)
addr = str(CBitcoinAddress.from_scriptPubKey(txo.scriptPubKey))
# This makes a transaction with only one vout
txid = bitcoind.pay_to(addr, amount)
new_amount = amount - Decimal("500") / Decimal(COIN)
addr = bitcoind.getnewaddress()
txin = CTxIn(COutPoint(lx(txid), 0), nSequence=4464)
txout = CTxOut(new_amount * COIN, CBitcoinAddress(addr).to_scriptPubKey())
tx = CMutableTransaction([txin], [txout], nVersion=2)
tx_hash = SignatureHash(emergency_script(pubkeys), tx, 0, SIGHASH_ALL,
int(amount * COIN), SIGVERSION_WITNESS_V0)
sigs = [k.sign(tx_hash) + bytes([SIGHASH_ALL]) for k in privkeys]
witness_script = [bytes(0), *sigs, emergency_script(pubkeys)]
tx.wit = CTxWitness([CTxInWitness(CScriptWitness(witness_script))])
# 1 month of locktime
bitcoind.generate_block(4464 - 2)
with pytest.raises(VerifyRejectedError, match="non-BIP68-final"):
bitcoind.send_tx(tx.serialize().hex())
bitcoind.generate_block(1)
bitcoind.send_tx(tx.serialize().hex())
assert bitcoind.has_utxo(addr)
def open_channel(address, mymoney, theirmoney, fees, their_coins, their_change, their_pubkey, their_out_addr): # pylint: disable=too-many-arguments
"""Open a payment channel."""
# Get inputs and change output
coins, change = select_coins(mymoney + 2 * fees)
# Make the anchor script
anchor_output_script = anchor_script(get_pubkey(), their_pubkey)
anchor_output_address = anchor_output_script.to_p2sh_scriptPubKey()
# Construct the anchor utxo
payment = CMutableTxOut(mymoney + theirmoney + 2 * fees, anchor_output_address)
# Anchor tx
transaction = CMutableTransaction(
their_coins + coins,
[payment, change, their_change])
# Half-sign
transaction = g.bit.signrawtransaction(transaction)['tx']
# Create channel in DB
channel = Channel(address,
CMutableTxIn(CMutableOutPoint(transaction.GetHash(), 0),
AnchorScriptSig(0, b'', anchor_output_script)),
CMutableTxOut(mymoney, g.bit.getnewaddress()),
CMutableTxOut(theirmoney, their_out_addr))
channel.put()
# Event: channel opened
CHANNEL_OPENED.send('channel', address=address)
return (transaction, anchor_output_script, channel.our.scriptPubKey)
def submit_opreturn(rpc_connection, address, data):
from bitcoin.core import CTxIn, CMutableTxOut, CScript, CMutableTransaction, COIN, CENT, b2x, b2lx
from bitcoin.core.script import OP_CHECKSIG, OP_RETURN
txouts = []
unspent = sorted([y for y in rpc_connection.listunspent(0) if str(y['address']) == address], key=lambda x: hash(x['amount']))
txins = [CTxIn(unspent[-1]['outpoint'])]
value_in = unspent[-1]['amount']
change_pubkey = rpc_connection.validateaddress(address)['pubkey']
change_out = CMutableTxOut(int(value_in - 2*CENT), CScript([change_pubkey, OP_CHECKSIG]))
digest_outs = [CMutableTxOut(CENT, CScript([OP_RETURN, data]))]
txouts = [change_out] + digest_outs
tx = CMutableTransaction(txins, txouts)
print tx.serialize().encode('hex')
r = rpc_connection.signrawtransaction(tx)
assert r['complete']
tx = r['tx']
#print b2x(tx.serialize())
#print len(tx.serialize()), 'bytes'
print(b2lx(rpc_connection.sendrawtransaction(tx)))
def submit_opreturn(rpc_raw, rpc_connection, address, data):
from bitcoin.core import CTxIn, CMutableTxOut, CScript, CMutableTransaction, COIN, CENT, b2x, b2lx
from bitcoin.core.script import OP_CHECKSIG, OP_RETURN
txouts = []
unspent = sorted(
[y for y in rpc_connection.listunspent(0) if str(y["address"]) == address], key=lambda x: hash(x["amount"])
)
txins = [CTxIn(unspent[-1]["outpoint"])]
value_in = unspent[-1]["amount"]
change_pubkey = rpc_connection.validateaddress(address)["pubkey"]
change_out = CMutableTxOut(int(value_in - 1 * CENT), CScript([change_pubkey, OP_CHECKSIG]))
digest_outs = [CMutableTxOut(0, CScript([OP_RETURN, data]))]
txouts = [change_out] + digest_outs
tx = CMutableTransaction(txins, txouts)
tx_hex = tx.serialize().encode("hex")
print "decoderawtransaction", tx_hex
transaction_decoded = rpc_raw.decoderawtransaction(tx_hex)
print json.dumps(transaction_decoded, indent=4, default=json_custom_parser)
r = rpc_connection.signrawtransaction(tx)
assert r["complete"]
tx = r["tx"]
# print b2x(tx.serialize())
# print len(tx.serialize()), 'bytes'
sent_tx_id = rpc_connection.sendrawtransaction(tx)
return b2lx(sent_tx_id)
def test_sendrawtransaction(self):
num_outputs = 5
given_transaction = CMutableTransaction([], [make_txout() for x in range(0, num_outputs)])
expected_txid = b2lx(given_transaction.GetHash())
given_transaction_hex = b2x(given_transaction.serialize())
proxy = FakeBitcoinProxy()
resulting_txid = proxy.sendrawtransaction(given_transaction_hex)
self.assertEqual(resulting_txid, expected_txid)
def put(self):
"""Persist self."""
commitment = CMutableTransaction([self.anchor], [self.our, self.their])
commitment = CMutableTransaction.from_tx(commitment)
commitment.vin[0].scriptSig = commitment.vin[0].scriptSig.to_script()
for tx_out in commitment.vout:
tx_out.scriptPubKey = tx_out.scriptPubKey.to_scriptPubKey()
with g.dat:
g.dat.execute("INSERT OR REPLACE INTO CHANNELS VALUES (?, ?)",
(self.address, commitment.serialize()))
def test_fundrawtransaction_adds_output(self):
num_outputs = 5
unfunded_transaction = CMutableTransaction([], [make_txout() for x in range(0, num_outputs)])
proxy = FakeBitcoinProxy()
funded_transaction_hex = proxy.fundrawtransaction(b2x(unfunded_transaction.serialize()))["hex"]
funded_transaction = CMutableTransaction.deserialize(x(funded_transaction_hex))
self.assertTrue(len(funded_transaction.vout) > num_outputs)
self.assertEqual(len(funded_transaction.vout), num_outputs + 1)
def unsigned_settlement(self):
"""Generate the settlement transaction."""
# Put outputs in the order of the inputs, so that both versions are the same
if self.anchor.scriptSig.my_index == 0:
transaction = CMutableTransaction([self.anchor], [self.our, self.their])
elif self.anchor.scriptSig.my_index == 1:
transaction = CMutableTransaction([self.anchor], [self.their, self.our])
else:
raise Exception("Unknown index", self.anchor.scriptSig.my_index)
return CMutableTransaction.from_tx(transaction)
def test_create_transaction_object_1(inputs_1, outputs_1):
r = PaymentService.create_transaction_object(inputs=inputs_1, outputs=outputs_1)
tx_in: List[CMutableTxIn] = [
CMutableTxIn(COutPoint(lx('4521418569de2f78d5d2d3c535567ac9c48c95314c53a67788d4dcdc9a8d915b'), 0))]
pk = CBitcoinAddress('16moGJwkzWhNC1pfnfJptKj9G1ogQz16xd').to_scriptPubKey()
tx_out: List[CMutableTxOut] = [CMutableTxOut(100000, pk)]
expected = CMutableTransaction(tx_in, tx_out)
assert b2x(r.serialize()) == b2x(expected.serialize())
def test_fundrawtransaction_hex_hash(self):
unfunded_transaction = CMutableTransaction([], [make_txout() for x in range(0, 5)])
proxy = FakeBitcoinProxy()
funded_transaction_hex = proxy.fundrawtransaction(b2x(unfunded_transaction.serialize()))["hex"]
funded_transaction = CMutableTransaction.deserialize(x(funded_transaction_hex))
self.assertTrue(unfunded_transaction is not funded_transaction)
self.assertEqual(type(funded_transaction), type(unfunded_transaction))
self.assertNotEqual(len(funded_transaction.vin), 0)
self.assertTrue(len(funded_transaction.vin) > len(unfunded_transaction.vin))
self.assertEqual(type(funded_transaction.vin[0]), CTxIn)
def redeem_contract(self, contract, secret):
print("Parsing script for redeem_contract...")
scriptarray = self.parse_script(contract.redeemScript)
redeemblocknum = scriptarray[8]
redeemPubKey = P2PKHBitcoinAddress.from_bytes(x(scriptarray[6]))
refundPubKey = P2PKHBitcoinAddress.from_bytes(x(scriptarray[13]))
p2sh = contract.p2sh
#checking there are funds in the address
amount = self.check_funds(p2sh)
if(amount == 0):
print("address ", p2sh, " not funded")
quit()
fundtx = self.find_transaction_to_address(p2sh)
amount = fundtx['amount'] / COIN
# print("Found fund_tx: ", fundtx)
p2sh = P2SHBitcoinAddress(p2sh)
if fundtx['address'] == p2sh:
print("Found {0} in p2sh {1}, redeeming...".format(amount, p2sh))
blockcount = self.bitcoind.getblockcount()
print("\nCurrent blocknum at time of redeem on Zcash:", blockcount)
if blockcount < int(redeemblocknum):
print('redeemPubKey', redeemPubKey)
zec_redeemScript = CScript(x(contract.redeemScript))
txin = CMutableTxIn(fundtx['outpoint'])
txout = CMutableTxOut(fundtx['amount'] - FEE, redeemPubKey.to_scriptPubKey())
# Create the unsigned raw transaction.
tx = CMutableTransaction([txin], [txout])
sighash = SignatureHash(zec_redeemScript, tx, 0, SIGHASH_ALL)
# TODO: protect privkey better, separate signing from rawtx creation
privkey = self.bitcoind.dumpprivkey(redeemPubKey)
sig = privkey.sign(sighash) + bytes([SIGHASH_ALL])
preimage = secret.encode('utf-8')
txin.scriptSig = CScript([sig, privkey.pub, preimage, OP_TRUE, zec_redeemScript])
# print("txin.scriptSig", b2x(txin.scriptSig))
txin_scriptPubKey = zec_redeemScript.to_p2sh_scriptPubKey()
print('Raw redeem transaction hex: ', b2x(tx.serialize()))
VerifyScript(txin.scriptSig, txin_scriptPubKey, tx, 0, (SCRIPT_VERIFY_P2SH,))
print("Script verified, sending raw transaction...")
txid = self.bitcoind.sendrawtransaction(tx)
fund_tx = str(fundtx['outpoint'])
redeem_tx = b2x(lx(b2x(txid)))
return {"redeem_tx": redeem_tx, "fund_tx": fund_tx}
else:
print("nLocktime exceeded, refunding")
print('refundPubKey', refundPubKey)
txid = self.bitcoind.sendtoaddress(refundPubKey, fundtx['amount'] - FEE)
fund_tx = str(fundtx['outpoint'])
refund_tx = b2x(lx(b2x(txid)))
return {"refund_tx": refund_tx, "fund_tx": fund_tx}
else:
print("No contract for this p2sh found in database", p2sh)
def sig_for_them(self):
"""Generate a signature for the mirror commitment transaction."""
transaction = CMutableTransaction([self.anchor], [self.their, self.our])
transaction = CMutableTransaction.from_tx(transaction) # copy
# convert scripts to CScript
transaction.vin[0].scriptSig = transaction.vin[0].scriptSig.to_script()
for tx_out in transaction.vout:
tx_out.scriptPubKey = tx_out.scriptPubKey.to_scriptPubKey()
# sign
sighash = SignatureHash(self.anchor.scriptSig.redeem, transaction, 0, SIGHASH_ALL)
sig = g.seckey.sign(sighash) + bytes([SIGHASH_ALL])
return sig
def build_tx(self) -> str:
# Sort inputs by serial number
ins = [x['input'] for x in
sorted(self.inputs, key=lambda k: k['serial_id'])]
# Sort outputs by serial number
outs = [x['output'] for x in
sorted(self.outputs, key=lambda k: k['serial_id'])]
self.tx = CMutableTransaction(ins, outs, nVersion=2, nLockTime=self.locktime)
self.txid = self.tx.GetTxid().hex()
return self.tx.serialize().hex()
def main():
proxy = bitcoin.rpc.Proxy()
assert len(sys.argv) > 1
digests = []
for f in sys.argv[1:]:
try:
with open(f, 'rb') as fd:
digests.append(Hash(fd.read()))
except FileNotFoundError as exp:
if len(f)/2 in (20, 32):
digests.append(x(f))
else:
raise exp
except IOError as exp:
print(exp, file=sys.stderr)
continue
for digest in digests:
unspent = sorted(proxy.listunspent(0),
key=lambda _x: hash(_x['amount']))
txins = [CTxIn(unspent[-1]['outpoint'])]
value_in = unspent[-1]['amount']
change_addr = proxy.getnewaddress()
change_pubkey = proxy.validateaddress(change_addr)['pubkey']
change_out = CMutableTxOut(params.MAX_MONEY, CScript([change_pubkey, OP_CHECKSIG]))
digest_outs = [CMutableTxOut(0, CScript([OP_RETURN, digest]))]
txouts = [change_out] + digest_outs
tx = CMutableTransaction(txins, txouts)
FEE_PER_BYTE = 0.00025*COIN/1000
while True:
tx.vout[0].nValue = int(value_in - max(len(tx.serialize()) * FEE_PER_BYTE, 0.00011*COIN))
r = proxy.signrawtransaction(tx)
assert r['complete']
tx = r['tx']
if value_in - tx.vout[0].nValue >= len(tx.serialize()) * FEE_PER_BYTE:
print(b2x(tx.serialize()))
print(len(tx.serialize()), 'bytes', file=sys.stderr)
print(b2lx(proxy.sendrawtransaction(tx)))
break
def from_utxo(txid_in: str,
tx_index_in: int,
sats: int,
privkey: str,
fee: int,
local_node_privkey: str,
local_funding_privkey: str,
remote_node_privkey: str,
remote_funding_privkey: str,
chain_hash: str = regtest_hash) -> Tuple['Funding', str]:
"""Make a funding transaction by spending this utxo using privkey: return Funding, tx."""
# Create dummy one to start: we will fill in txid at the end.
funding = Funding('', 0, sats - fee, local_node_privkey,
local_funding_privkey, remote_node_privkey,
remote_funding_privkey, chain_hash)
# input private key.
inkey = privkey_expand(privkey)
inkey_pub = coincurve.PublicKey.from_secret(inkey.secret)
# use RBF'able input (requirement for dual-funded things)
txin = CTxIn(COutPoint(bytes.fromhex(txid_in), tx_index_in),
nSequence=0xFFFFFFFD)
txout = CTxOut(
sats - fee,
CScript([script.OP_0,
sha256(funding.redeemscript()).digest()]))
tx = CMutableTransaction([txin], [txout],
nVersion=2,
nLockTime=funding.locktime)
# now fill in funding txid.
funding.txid = tx.GetTxid().hex()
funding.tx = tx
# while we're here, sign the transaction.
address = P2WPKHBitcoinAddress.from_scriptPubKey(
CScript([script.OP_0, Hash160(inkey_pub.format())]))
sighash = script.SignatureHash(address.to_redeemScript(),
tx,
0,
script.SIGHASH_ALL,
amount=sats,
sigversion=script.SIGVERSION_WITNESS_V0)
sig = inkey.sign(sighash, hasher=None) + bytes([script.SIGHASH_ALL])
tx.wit = CTxWitness(
[CTxInWitness(CScriptWitness([sig, inkey_pub.format()]))])
return funding, tx.serialize().hex()
def redeem_after_timelock(contract):
p2sh = contract.p2sh
fundtx = find_transaction_to_address(p2sh)
amount = fundtx['amount'] / COIN
if (fundtx['address'].__str__() != p2sh):
print("no fund transaction found to the contract p2sh address ", p2sh)
quit()
print("Found fundtx:", fundtx)
# Parsing redeemblocknum from the redeemscript of the p2sh
redeemblocknum = find_redeemblocknum(contract)
blockcount = bitcoind.getblockcount()
print("Current block:", blockcount, "Can redeem from block:",
redeemblocknum)
if (still_locked(contract)):
print("too early for redeeming with timelock try again at block",
redeemblocknum, "or later")
return 0
print("Found {0} in p2sh {1}, redeeming...".format(amount, p2sh))
redeemPubKey = find_refundAddr(contract)
print('refundPubKey', redeemPubKey)
redeemScript = CScript(x(contract.redeemScript))
txin = CMutableTxIn(fundtx['outpoint'])
txout = CMutableTxOut(fundtx['amount'] - FEE,
redeemPubKey.to_scriptPubKey())
# Create the unsigned raw transaction.
txin.nSequence = 0
tx = CMutableTransaction([txin], [txout])
tx.nLockTime = redeemblocknum
sighash = SignatureHash(redeemScript, tx, 0, SIGHASH_ALL)
# TODO: figure out how to better protect privkey
privkey = bitcoind.dumpprivkey(redeemPubKey)
sig = privkey.sign(sighash) + bytes([SIGHASH_ALL])
txin.scriptSig = CScript([sig, privkey.pub, OP_FALSE, redeemScript])
# exit()
# print("txin.scriptSig", b2x(txin.scriptSig))
txin_scriptPubKey = redeemScript.to_p2sh_scriptPubKey()
# print('Redeem txhex', b2x(tx.serialize()))
VerifyScript(txin.scriptSig, txin_scriptPubKey, tx, 0,
(SCRIPT_VERIFY_P2SH, ))
print("script verified, sending raw tx")
txid = bitcoind.sendrawtransaction(tx)
print("Txid of submitted redeem tx: ", b2x(lx(b2x(txid))))
return b2x(lx(b2x(txid)))
def signed_commitment(self):
"""Return the fully signed commitment transaction."""
transaction = CMutableTransaction([self.anchor], [self.our, self.their])
transaction = CMutableTransaction.from_tx(transaction)
for tx_out in transaction.vout:
tx_out.scriptPubKey = tx_out.scriptPubKey.to_scriptPubKey()
sighash = SignatureHash(self.anchor.scriptSig.redeem, transaction, 0, SIGHASH_ALL)
sig = g.seckey.sign(sighash) + bytes([SIGHASH_ALL])
transaction.vin[0].scriptSig = transaction.vin[0].scriptSig.to_script(sig)
# verify signing worked
VerifyScript(transaction.vin[0].scriptSig,
self.anchor.scriptSig.redeem.to_p2sh_scriptPubKey(),
transaction, 0, (SCRIPT_VERIFY_P2SH,))
return transaction
def get_unsigned_tx(funding_tx,
redeem_script,
address,
amount,
lock_time=0,
n_sequence=0,
vout=0):
"""
Returns a raw transaction and it's signature hash
that pays to address from funding_tx
Arguments:
funding_tx (str): the 'input' tx
redeem_script (str): The redeem script
address (str): The output address that would receive `amount`
lock_time (int, optional): The time the tx should be locked to
n_sequence (int, optional): The sequence number to use in tx
vout (int, optional): The index of the output point of `funding_tx`
Returns:
A tuple containing:
1/ The serial tx
2/ The tx hash
"""
# Set P2SH funding tx in little-endian
fx = lx(funding_tx)
# nSequence must be any number less than 0xffffffff to enable nLockTime
txin = CMutableTxIn(COutPoint(fx, vout), nSequence=n_sequence)
# if(nlock_time != 0):
# txin = CMutableTxIn(COutPoint(fx, vout), nSequence=n_sequence)
# else:
# txin = CMutableTxIn(COutPoint(fx, vout))
# Convert amount to Satoshi's
amount *= COIN
# Create the txout to address
script_pubkey = CBitcoinAddress(address).to_scriptPubKey()
txout = CMutableTxOut(amount, script_pubkey)
# Create the unsigned transaction.
tx = CMutableTransaction([txin], [txout], nLockTime=lock_time)
# Calculte TX sig hash
sighash = SignatureHash(CScript(redeem_script), tx, 0, SIGHASH_ALL)
return (tx.serialize(), sighash)
def fundrawtransaction(self, given_transaction, *args, **kwargs):
"""
Make up some inputs for the given transaction.
"""
# just use any txid here
vintxid = lx("99264749804159db1e342a0c8aa3279f6ef4031872051a1e52fb302e51061bef")
if isinstance(given_transaction, str):
given_bytes = x(given_transaction)
elif isinstance(given_transaction, CMutableTransaction):
given_bytes = given_transaction.serialize()
else:
raise FakeBitcoinProxyException("Wrong type passed to fundrawtransaction.")
# this is also a clever way to not cause a side-effect in this function
transaction = CMutableTransaction.deserialize(given_bytes)
for vout_counter in range(0, self._num_fundrawtransaction_inputs):
txin = CMutableTxIn(COutPoint(vintxid, vout_counter))
transaction.vin.append(txin)
# also allocate a single output (for change)
txout = make_txout()
transaction.vout.append(txout)
transaction_hex = b2x(transaction.serialize())
return {"hex": transaction_hex, "fee": 5000000}
def create_trx(op_return_val, issuing_transaction_fee, issuing_address,
tx_outs, tx_inputs):
"""
:param op_return_val:
:param issuing_transaction_fee:
:param issuing_address:
:param tx_outs:
:param tx_input:
:return:
"""
cert_out = CMutableTxOut(0, CScript([OP_RETURN, op_return_val]))
tx_ins = []
value_in = 0
for tx_input in tx_inputs:
tx_ins.append(CTxIn(COutPoint(tx_input.tx_hash,
tx_input.tx_out_index)))
value_in += tx_input.coin_value
# send change back to our address
amount = value_in - issuing_transaction_fee
if amount > 0:
change_out = create_transaction_output(issuing_address, amount)
tx_outs = tx_outs + [change_out]
tx_outs = tx_outs + [cert_out]
transaction = CMutableTransaction(tx_ins, tx_outs)
return transaction
def partial_spend_p2sh_mediator(redeemScript,
rein,
mediator_address,
mediator_sig=False):
txin_redeemScript = CScript(x(redeemScript))
txin_scriptPubKey = txin_redeemScript.to_p2sh_scriptPubKey()
txin_p2sh_address = CBitcoinAddress.from_scriptPubKey(txin_scriptPubKey)
(txins, total_value) = unspent_txins(txin_p2sh_address, rein.testnet)
if len(txins) == 0:
raise ValueError('No unspent txins found')
txins_str = ""
txins_obj = []
for txid, vout in txins:
txins_str += " " + txid + "-" + str(vout)
txins_obj.append(CMutableTxIn(COutPoint(lx(txid), vout)))
fee = 0.00025
amount = round(total_value - fee, 8)
if amount <= 0:
raise ValueError('Not enough value in the inputs')
if mediator_sig:
txout = CMutableTxOut(
amount * COIN,
CBitcoinAddress(mediator_address).to_scriptPubKey())
tx = CMutableTransaction(txins_obj, [txout])
seckey = CBitcoinSecret(rein.user.dkey)
ntxins = len(txins_obj)
sig = ""
for i in range(0, ntxins):
sighash = SignatureHash(txin_redeemScript, tx, i, SIGHASH_ALL)
sig += " " + b2x(seckey.sign(sighash) + x("01"))
return (txins_str[1:], "{:.8f}".format(amount), str(mediator_address),
sig[1:])
return (txins_str[1:], "{:.8f}".format(amount), str(mediator_address))
def spend_escrow(self, payer_sig, redeemer_sig, serial_tx, redeem_script):
'''
Sends a transaction fulfilling the redeem script of escrow tx
'''
# Read in transaction
temp_tx = CTransaction.deserialize(serial_tx)
tx = CMutableTransaction.from_tx(temp_tx)
txin = tx.vin[0]
# Set script sig
txin.scriptSig = CScript([
OP_FALSE, payer_sig + '\x01', redeemer_sig + '\x01', OP_TRUE,
redeem_script
])
# Verify script
redeem_script = CScript(redeem_script)
serial_tx = tx.serialize()
VerifyScript(txin.scriptSig, redeem_script.to_p2sh_scriptPubKey(), tx,
0, [SCRIPT_VERIFY_P2SH])
serial_tx = tx.serialize()
if not self.test:
# txid = self.proxy.sendrawtransaction(tx)
txid = b2lx(Hash(serial_tx))
else:
txid = b2lx(Hash(serial_tx))
self.logger.info("spend_escrow: TXID is %s", txid)
self.logger.info("spend_escrow: RAW TX is %s", b2x(serial_tx))
return serial_tx
def refund_tx(self, payer_sig, serial_tx, redeem_script):
'''
Sends a transaction refunding the funder of
the P2SH address.
'''
# Read in transaction
temp_tx = CTransaction.deserialize(serial_tx)
tx = CMutableTransaction.from_tx(temp_tx)
txin = tx.vin[0]
# Set script sig
txin.scriptSig = CScript([payer_sig + '\x01', OP_FALSE, redeem_script])
# Verify script
redeem_script = CScript(redeem_script)
VerifyScript(txin.scriptSig, redeem_script.to_p2sh_scriptPubKey(), tx,
0, [SCRIPT_VERIFY_P2SH])
serial_tx = tx.serialize()
if not self.test:
# txid = self.self.proxy.sendrawtransaction(tx)
txid = b2lx(Hash(serial_tx))
else:
txid = b2lx(Hash(serial_tx))
self.logger.info("refund_tx: TXID is %s", txid)
self.logger.info("refund_tx: RAW TX is %s", b2x(serial_tx))
return serial_tx
def maketx(tx):
#txid from blockr. bitcoind does not support tx index!
txid = lx(tx)
vout = 0
outp = COutPoint(txid, vout)
print ("output: %s"%outp)
# Create the txin structure, which includes the outpoint
txin = CMutableTxIn(outp)
print (txin)
txin_scriptPubKey = CScript([OP_DUP, OP_HASH160, Hash160(seckey.pub), OP_EQUALVERIFY, OP_CHECKSIG])
print (txin_scriptPubKey)
amount = 0.001*COIN
txout = CMutableTxOut(amount, CBitcoinAddress(a).to_scriptPubKey())
print (txout)
# Create the unsigned transaction.
newtx = CMutableTransaction([txin], [txout])
print (newtx)
sighash = SignatureHash(txin_scriptPubKey, newtx, 0, SIGHASH_ALL)
print (sighash)
# Now sign it. We have to append the type of signature we want to the end, in
# this case the usual SIGHASH_ALL.
sig = seckey.sign(sighash) + bytes([SIGHASH_ALL])
print (sig)
# Set the scriptSig of our transaction input appropriately.
txin.scriptSig = CScript([sig, seckey.pub])
try:
VerifyScript(txin.scriptSig, txin_scriptPubKey, newtx, 0, (SCRIPT_VERIFY_P2SH,))
except:
pass
print ('*'*20)
print(b2x(newtx.serialize()))
"""
def get(cls, address):
"""Get a Channel with the specified address."""
row = g.dat.execute(
"SELECT * from CHANNELS WHERE address = ?", (address,)).fetchone()
if row is None:
raise Exception("Unknown address", address)
address, commitment = row
commitment = CMutableTransaction.deserialize(commitment)
commitment = CMutableTransaction.from_tx(commitment)
assert len(commitment.vin) == 1
assert len(commitment.vout) == 2
commitment.vin[0].scriptSig = AnchorScriptSig.from_script(
commitment.vin[0].scriptSig)
for tx_out in commitment.vout:
tx_out.scriptPubKey = CBitcoinAddress.from_scriptPubKey(tx_out.scriptPubKey)
return cls(address,
commitment.vin[0],
commitment.vout[0],
commitment.vout[1])
def _build_certificate_transactions(wallet, issuing_address, revocation_address, certificate_metadata, fees, tail):
"""Make transactions for the certificates.
"""
logging.info('Creating tx of certificate for recipient uid: %s ...',
certificate_metadata.uid)
with open(certificate_metadata.certificate_hash_file_name, 'rb') as in_file:
# this is the recipient-specific hash that will be recorded on the
# blockchain
hashed_certificate = in_file.read()
cert_out = CMutableTxOut(0, CScript([OP_RETURN, hashed_certificate]))
# send a transaction to the recipient's public key, and to a revocation
# address
txouts = create_recipient_outputs(
certificate_metadata.pubkey, revocation_address, fees.min_per_output)
# define transaction inputs
unspent_outputs = wallet.get_unspent_outputs(issuing_address)
last_input = unspent_outputs[tail]
txins = [CTxIn(last_input.outpoint)]
value_in = last_input.amount
# very important! If we don't send the excess change back to ourselves,
# some lucky miner gets it!
amount = value_in - fees.cost_per_transaction
if amount > 0:
change_out = create_transaction_output(issuing_address, amount)
txouts = txouts + [change_out]
txouts = txouts + [cert_out]
tx = CMutableTransaction(txins, txouts)
# this is the transaction for a recipient, unsigned
hextx = hexlify(tx.serialize())
with open(certificate_metadata.unsigned_tx_file_name, 'wb') as out_file:
out_file.write(bytes(hextx, 'utf-8'))
logging.info(
'Created unsigned tx for recipient; last_input=%s', last_input)
return last_input
def sendrawtransaction(self, given_transaction):
"""
Pretend to broadcast and relay the transaction. Return the txid of the
given transaction.
"""
if isinstance(given_transaction, str):
given_bytes = x(given_transaction)
elif isinstance(given_transaction, CMutableTransaction):
given_bytes = given_transaction.serialize()
else:
raise FakeBitcoinProxyException("Wrong type passed to sendrawtransaction.")
transaction = CMutableTransaction.deserialize(given_bytes)
return b2lx(transaction.GetHash())
def signrawtransaction(self, given_transaction):
"""
This method does not actually sign the transaction, but it does return
a transaction based on the given transaction.
"""
if isinstance(given_transaction, str):
given_bytes = x(given_transaction)
elif isinstance(given_transaction, CMutableTransaction):
given_bytes = given_transaction.serialize()
else:
raise FakeBitcoinProxyException("Wrong type passed to signrawtransaction.")
transaction = CMutableTransaction.deserialize(given_bytes)
transaction_hex = b2x(transaction.serialize())
return {"hex": transaction_hex}
def from_serialized(cls, serialized_tx, testnet=False):
tx = CMutableTransaction.stream_deserialize(BytesIO(serialized_tx))
return BitcoinTransaction(tx, testnet)
bitcoin.SelectParams('testnet')
rpc = bitcoin.rpc.Proxy()
args.dust = int(args.dust * COIN)
feeperbyte1 = args.fee1 / 1000 * COIN
feeperbyte2 = args.fee2 / 1000 * COIN
# Construct payment tx
payment_address = CBitcoinAddress(args.address)
payment_txout = CMutableTxOut(int(args.amount * COIN), payment_address.to_scriptPubKey())
change_txout = CMutableTxOut(0, rpc.getnewaddress().to_scriptPubKey())
tx = CMutableTransaction()
tx.vout.append(change_txout)
tx.vout.append(payment_txout)
# Add all undesirable txouts meant to reduce propagation
if args.op_return:
op_ret_txout = CMutableTxOut(0, CScript([OP_RETURN, b'\x00unsuccessful double-spend attempt\x00']))
tx.vout.append(op_ret_txout)
if args.multisig:
multisig_txout = CMutableTxOut(args.dust,
CScript([1, x('0378d430274f8c5ec1321338151e9f27f4c676a008bdf8638d07c0b6be9ab35c71'),
b'\x00'*33,
2, OP_CHECKMULTISIG]))
tx.vout.append(multisig_txout)
def test_send_script_spend(self):
"""
Run more in-depth execution checks on the script generated for the send transaction
"""
sender_private_key = CBitcoinSecret.from_secret_bytes(x('4f65da9b656de4036076911707d2b2dbf065689245b8674faa8790e36d7e5850'))
sender_public_key = sender_private_key.pub
recipient_private_key = CBitcoinSecret.from_secret_bytes(x('cfe8e33672f7045f020210f3c7afbca660e053e4c9415c542ff185e97b175cf0'))
recipient_public_key = recipient_private_key.pub
secret = x('88d6e51f777b0b8dc0f429da9f372fbc')
secret_hash = Hash(secret)
send_to_key = CBitcoinSecret.from_secret_bytes(x('15a249b4c09286b877d4708191f1ee8de09903bae034dd9dc8e3286451fa1c80'))
send_to_address = P2PKHBitcoinAddress.from_pubkey(send_to_key.pub)
random_tx_id = x('8390b4c8198198c6447da1a6fad498209436a785459936b95a1e3b63618c1d8a')
value = 10 * COIN
send_tx_script_pub_key = build_send_out_script(sender_public_key, recipient_public_key, secret_hash)
send_txins = [CMutableTxIn(COutPoint(random_tx_id, 0))]
send_txouts = [CMutableTxOut(value, send_tx_script_pub_key)]
send_tx = CMutableTransaction(send_txins, send_txouts)
# Test the standard spend transaction
txins = [CMutableTxIn(COutPoint(Hash(send_tx.serialize()), 0))]
txouts = [CMutableTxOut(value, send_to_address.to_scriptPubKey())]
recv_tx = CMutableTransaction(txins, txouts)
sighash = SignatureHash(send_tx_script_pub_key, recv_tx, 0, SIGHASH_ALL)
recipient_sig = recipient_private_key.sign(sighash) + (b'\x01') # bytes([SIGHASH_ALL])
recv_tx.vin[0].scriptSig = CScript([secret, 0, recipient_sig, recipient_public_key])
VerifyScript(recv_tx.vin[0].scriptSig, send_tx.vout[0].scriptPubKey, recv_tx, 0, (SCRIPT_VERIFY_P2SH,))
# Test a refund transaction
refund_tx = CMutableTransaction(txins, txouts)
sighash = SignatureHash(send_tx_script_pub_key, refund_tx, 0, SIGHASH_ALL)
sender_sig = sender_private_key.sign(sighash) + (b'\x01') # bytes([SIGHASH_ALL])
recipient_sig = recipient_private_key.sign(sighash) + (b'\x01') # bytes([SIGHASH_ALL])
refund_tx.vin[0].scriptSig = CScript([sender_sig, sender_public_key, 1, recipient_sig, recipient_public_key])
VerifyScript(refund_tx.vin[0].scriptSig, send_tx_script_pub_key, refund_tx, 0, (SCRIPT_VERIFY_P2SH,))
# Test invalid transactions are rejected
invalid_tx = CMutableTransaction(txins, txouts)
sighash = SignatureHash(send_tx_script_pub_key, invalid_tx, 0, SIGHASH_ALL)
sender_sig = sender_private_key.sign(sighash) + (b'\x01') # bytes([SIGHASH_ALL])
recipient_sig = recipient_private_key.sign(sighash) + (b'\x01') # bytes([SIGHASH_ALL])
invalid_tx.vin[0].scriptSig = CScript([])
with self.assertRaises(MissingOpArgumentsError):
VerifyScript(invalid_tx.vin[0].scriptSig, send_tx_script_pub_key, invalid_tx, 0, (SCRIPT_VERIFY_P2SH,))
invalid_tx.vin[0].scriptSig = CScript([recipient_sig, recipient_public_key, 0])
with self.assertRaises(VerifyOpFailedError):
VerifyScript(invalid_tx.vin[0].scriptSig, send_tx_script_pub_key, invalid_tx, 0, (SCRIPT_VERIFY_P2SH,))
invalid_tx.vin[0].scriptSig = CScript([recipient_sig, recipient_public_key, 1])
with self.assertRaises(VerifyOpFailedError):
VerifyScript(invalid_tx.vin[0].scriptSig, send_tx_script_pub_key, invalid_tx, 0, (SCRIPT_VERIFY_P2SH,))
invalid_tx.vin[0].scriptSig = CScript([recipient_sig, recipient_public_key, 1, recipient_sig, recipient_public_key])
with self.assertRaises(VerifyOpFailedError):
VerifyScript(invalid_tx.vin[0].scriptSig, send_tx_script_pub_key, invalid_tx, 0, (SCRIPT_VERIFY_P2SH,))
invalid_tx.vin[0].scriptSig = CScript([sender_sig, sender_public_key, 1, sender_sig, sender_public_key])
with self.assertRaises(VerifyOpFailedError):
VerifyScript(invalid_tx.vin[0].scriptSig, send_tx_script_pub_key, invalid_tx, 0, (SCRIPT_VERIFY_P2SH,))
try:
args.txid = lx(args.txid)
except ValueError as err:
parser.error('Invalid txid: %s' % str(err))
if len(args.txid) != 32:
parser.error('Invalid txid: Wrong length.')
try:
rpc.gettransaction(args.txid)
except IndexError as err:
parser.exit('Invalid txid: Not in wallet.')
txinfo = rpc.getrawtransaction(args.txid, True)
tx = CMutableTransaction.from_tx(txinfo['tx'])
if 'confirmations' in txinfo and txinfo['confirmations'] > 0:
parser.exit("Transaction already mined; %d confirmations." % txinfo['confirmations'])
# Find a txout that was being used for change
change_txout = None
for vout in tx.vout:
try:
addr = CBitcoinAddress.from_scriptPubKey(vout.scriptPubKey)
except ValueError:
continue
if rpc.validateaddress(addr)['ismine']:
change_txout = vout
break
# transaction hashes are shown little-endian rather than the usual big-endian.
# There's also a corresponding x() convenience function that takes big-endian
# hex and converts it to bytes.
txid = lx('bff785da9f8169f49be92fa95e31f0890c385bfb1bd24d6b94d7900057c617ae')
vout = 0
# Create the txin structure, which includes the outpoint. The scriptSig
# defaults to being empty.
txin = CMutableTxIn(COutPoint(txid, vout))
# Create the txout. This time we create the scriptPubKey from a Bitcoin
# address.
txout = CMutableTxOut(0.0005*COIN, CBitcoinAddress('323uf9MgLaSn9T7vDaK1cGAZ2qpvYUuqSp').to_scriptPubKey())
# Create the unsigned transaction.
tx = CMutableTransaction([txin], [txout])
# Calculate the signature hash for that transaction. Note how the script we use
# is the redeemScript, not the scriptPubKey. That's because when the CHECKSIG
# operation happens EvalScript() will be evaluating the redeemScript, so the
# corresponding SignatureHash() function will use that same script when it
# replaces the scriptSig in the transaction being hashed with the script being
# executed.
sighash = SignatureHash(txin_redeemScript, tx, 0, SIGHASH_ALL)
# Now sign it. We have to append the type of signature we want to the end, in
# this case the usual SIGHASH_ALL.
sig = seckey.sign(sighash) + bytes([SIGHASH_ALL])
# Set the scriptSig of our transaction input appropriately.
txin.scriptSig = CScript([sig, txin_redeemScript])
if unspent_tx.vout[0].nValue < args.amount:
continue
if check_full_rbf_optin(unspent_tx):
tx1 = unspent_tx
logging.info('Found unconfirmed full-RBF tx1 %s' % b2lx(txid))
break
else:
txids_seen.add(txid)
else:
logging.info('No unconfirmed full-RBF tx1 found; creating new tx')
tx2 = CMutableTransaction.from_tx(tx1) if tx1 is not None else CMutableTransaction()
# There might be a better way to fund the new outputs, so delete all but the
# first input. Of course, we can't delete all the inputs - the new transaction
# wouldn't conflict with the old one and you'd pay everyone twice!
tx2.vin = tx2.vin[0:1]
if not args.first_seen_safe and len(tx2.vout) > 0:
# Delete the change output.
#
# Unfortunately there isn't any way to ask Bitcoin Core if a given address
# is a change address; if you're sending yourself funds to test the feature
# it's not possible to distinguish change from send-to-self outputs.
#
# So instead we always build transactions such that the first output is
# change, and we delete only that output. Not pretty - you don't want to do
