def test_exercise_4(self):
prev_tx = bytes.fromhex(
'75a1c4bc671f55f626dda1074c7725991e6f68b8fcefcfca7b64405ca3b45f1c')
prev_index = 1
target_address = 'miKegze5FQNCnGw6PKyqUbYUeBa4x2hFeM'
target_amount = 0.01
change_address = 'mzx5YhAH9kNHtcN481u6WkjeHjYtVeKVh2'
change_amount = 0.009
secret = 8675309
priv = PrivateKey(secret=secret)
tx_ins = []
tx_ins.append(TxIn(prev_tx, prev_index, Script([]), 0xffffffff))
tx_outs = []
h160 = decode_base58(target_address)
script_pubkey = p2pkh_script(h160)
target_satoshis = int(target_amount * 100000000)
tx_outs.append(TxOut(target_satoshis, script_pubkey))
h160 = decode_base58(change_address)
script_pubkey = p2pkh_script(h160)
change_satoshis = int(change_amount * 100000000)
tx_outs.append(TxOut(change_satoshis, script_pubkey))
tx_obj = Tx(1, tx_ins, tx_outs, 0, testnet=True)
self.assertTrue(tx_obj.sign_input(0, priv))
self.assertTrue(tx_obj.verify())
want = '01000000011c5fb4a35c40647bcacfeffcb8686f1e9925774c07a1dd26f6551f67bcc4a175010000006b483045022100a08ebb92422b3599a2d2fcdaa11f8f807a66ccf33e7f4a9ff0a3c51f1b1ec5dd02205ed21dfede5925362b8d9833e908646c54be7ac6664e31650159e8f69b6ca539012103935581e52c354cd2f484fe8ed83af7a3097005b2f9c60bff71d35bd795f54b67ffffffff0240420f00000000001976a9141ec51b3654c1f1d0f4929d11a1f702937eaf50c888ac9fbb0d00000000001976a914d52ad7ca9b3d096a38e752c2018e6fbc40cdf26f88ac00000000'
self.assertEqual(tx_obj.serialize().hex(), want)
def test_sign_input(self):
private_key = PrivateKey(secret=8675309)
tx_ins = []
prev_tx = bytes.fromhex(
'0025bc3c0fa8b7eb55b9437fdbd016870d18e0df0ace7bc9864efc38414147c8')
tx_ins.append(
TxIn(
prev_tx=prev_tx,
prev_index=0,
script_sig=Script([]),
sequence=0xffffffff,
))
tx_outs = []
h160 = decode_base58('mzx5YhAH9kNHtcN481u6WkjeHjYtVeKVh2')
tx_outs.append(
TxOut(amount=int(0.99 * 100000000),
script_pubkey=p2pkh_script(h160)))
h160 = decode_base58('mnrVtF8DWjMu839VW3rBfgYaAfKk8983Xf')
tx_outs.append(
TxOut(amount=int(0.1 * 100000000),
script_pubkey=p2pkh_script(h160)))
tx = Tx(
version=1,
tx_ins=tx_ins,
tx_outs=tx_outs,
locktime=0,
testnet=True,
)
self.assertTrue(tx.sign_input(0, private_key, SIGHASH_ALL))
def test_example_6(self):
tx_ins = []
prev_tx = bytes.fromhex(
'0d6fe5213c0b3291f208cba8bfb59b7476dffacc4e5cb66f6eb20a080843a299')
prev_index = 13
tx_ins.append(TxIn(prev_tx, prev_index, Script([]), 0xffffffff))
tx_outs = []
change_amount = int(0.33 * 100000000)
change_h160 = decode_base58('mzx5YhAH9kNHtcN481u6WkjeHjYtVeKVh2')
change_script = p2pkh_script(change_h160)
tx_outs.append(TxOut(amount=change_amount,
script_pubkey=change_script))
target_amount = int(0.1 * 100000000)
target_h160 = decode_base58('mnrVtF8DWjMu839VW3rBfgYaAfKk8983Xf')
target_script = p2pkh_script(target_h160)
tx_outs.append(TxOut(amount=target_amount,
script_pubkey=target_script))
transaction = Tx(1, tx_ins, tx_outs, 0, testnet=True)
z = transaction.sig_hash(0)
private_key = PrivateKey(secret=8675309)
der = private_key.sign(z).der()
sig = der + SIGHASH_ALL.to_bytes(1, 'big')
sec = private_key.point.sec()
transaction.tx_ins[0].script_sig = Script([sig, sec])
want = '010000000199a24308080ab26e6fb65c4eccfadf76749bb5bfa8cb08f291320b3c21e56f0d0d0000006b4830450221008ed46aa2cf12d6d81065bfabe903670165b538f65ee9a3385e6327d80c66d3b502203124f804410527497329ec4715e18558082d489b218677bd029e7fa306a72236012103935581e52c354cd2f484fe8ed83af7a3097005b2f9c60bff71d35bd795f54b67ffffffff02408af701000000001976a914d52ad7ca9b3d096a38e752c2018e6fbc40cdf26f88ac80969800000000001976a914507b27411ccf7f16f10297de6cef3f291623eddf88ac00000000'
self.assertEqual(transaction.serialize().hex(), want)
def new_commitment_tx(node, current_channel, cost, secret_hash):
remote_peer = current_channel.peer
# Create input using the output from the funding tx
tx_in = TxIn(bytes.fromhex(current_channel.funding_tx.id()), 0)
# Create 3 outputs. 1 to nodeA and 1 to nodeB and 1 to an HTLC script
script_1 = p2pkh_script(decode_base58(node.address))
tx_out_1 = TxOut(amount=current_channel.local_amt - cost,
script_pubkey=script_1)
script_2 = p2pkh_script(decode_base58(remote_peer.btc_addr.decode()))
tx_out_2 = TxOut(amount=current_channel.remote_amt, script_pubkey=script_2)
#script_3 HTLC
script_3 = Script([
99, 168, secret_hash, 136, 118, 169,
hash160(remote_peer.public_key.sec()), 103,
encode_varint(1000), 177, 117, 118, 169,
hash160(node.public_key.sec()), 104, 136, 172
])
tx_out_3 = TxOut(amount=cost, script_pubkey=script_3)
# Construct the commitment tx object
commitment_tx = Tx(1, [tx_in], [tx_out_1, tx_out_2, tx_out_3], 0, True)
#sign it
commitment_tx.tx_ins[0].script_sig = get_script_sig(
commitment_tx, node.private_key)
return commitment_tx
def sig_hash_bip143(prev_tx, tx, txi, redeem_script=None, witness_script=None, testnet=False):
"""
bip143
1:04LE version
2:32 hash prevouts
3:32 hash sequence
4:32+4LE outpoint
5:* script_code of the input
6:08LE value of output spent
7:04LE n_sequence of the input
8:32 hash outputs
9:4LE n_locktime
10:4LE sighash
"""
s = util.int_to_little_endian(tx["version"], 4) # 1
hash_all_prevouts, hash_all_sequence = hash_all_txis(tx)
s += hash_all_prevouts + hash_all_sequence # 2,3
s += txi["txid"][::-1] + util.int_to_little_endian(txi["idx"], 4) # 4
# 5
if witness_script:
script_code = script.serialize(witness_script)
elif redeem_script:
script_code = script.serialize(script.p2pkh_script(redeem_script[1]))
else:
script_code = script.serialize(script.p2pkh_script(prev_tx["txos"][txi["idx"]]["script"][1]))
s += script_code
s += util.int_to_little_endian(prev_tx["txos"][txi["idx"]]["amount"], 8) # 6
s += util.int_to_little_endian(txi["seq.no"], 4) # 7
s += hash_all_txos(tx) # 8
s += util.int_to_little_endian(tx["locktime"], 4) # 9
s += util.int_to_little_endian(util.SIGHASH_ALL, 4) # 10
return int.from_bytes(util.hash256(s), 'big')
def test_example_1(self):
tx_ins = []
prev_tx = bytes.fromhex(
'8be2f69037de71e3bc856a6627ed3e222a7a2d0ce81daeeb54a3aea8db274149')
prev_index = 4
tx_ins.append(TxIn(prev_tx, prev_index))
tx_outs = []
h160 = decode_base58('mzx5YhAH9kNHtcN481u6WkjeHjYtVeKVh2')
tx_outs.append(
TxOut(
amount=int(0.38 * 100000000),
script_pubkey=p2pkh_script(h160),
))
h160 = decode_base58('mnrVtF8DWjMu839VW3rBfgYaAfKk8983Xf')
tx_outs.append(
TxOut(
amount=int(0.1 * 100000000),
script_pubkey=p2pkh_script(h160),
))
tx_obj = Tx(1, tx_ins, tx_outs, 0, testnet=True)
z = tx_obj.sig_hash(0)
pk = PrivateKey(secret=8675309)
der = pk.sign(z).der()
sig = der + SIGHASH_ALL.to_bytes(1, 'big')
sec = pk.point.sec()
tx_obj.tx_ins[0].script_sig = Script([sig, sec])
want = '0100000001494127dba8aea354ebae1de80c2d7a2a223eed27666a85bce371de3790f6e28b040000006b483045022100fa3032607b50e8cb05bedc9d43f986f19dedc22e61320b9765061c5cd9c66946022072d514ef637988515bfa59a660596206de68f0ed4090d0a398e70f4d81370dfb012103935581e52c354cd2f484fe8ed83af7a3097005b2f9c60bff71d35bd795f54b67ffffffff0280d54302000000001976a914d52ad7ca9b3d096a38e752c2018e6fbc40cdf26f88ac80969800000000001976a914507b27411ccf7f16f10297de6cef3f291623eddf88ac00000000'
self.assertEqual(tx_obj.serialize().hex(), want)
def sig_hash_bip143(self,
input_index,
redeem_script=None,
witness_script=None):
'''Returns the integer representation of the hash that needs to get
signed for index input_index'''
tx_in = self.tx_ins[input_index]
# per BIP143 spec
s = int_to_little_endian(self.version, 4)
s += self.hash_prevouts() + self.hash_sequence()
s += tx_in.prev_tx[::-1] + int_to_little_endian(tx_in.prev_index, 4)
if witness_script:
script_code = witness_script.serialize()
elif redeem_script:
script_code = p2pkh_script(redeem_script.cmds[1]).serialize()
else:
script_code = p2pkh_script(
tx_in.script_pubkey(self.testnet).cmds[1]).serialize()
s += script_code
s += int_to_little_endian(tx_in.value(), 8)
s += int_to_little_endian(tx_in.sequence, 4)
s += self.hash_outputs()
s += int_to_little_endian(self.locktime, 4)
s += int_to_little_endian(SIGHASH_ALL, 4)
return int.from_bytes(hash256(s), 'big')
def get_output_info(num_outputs, amount_available):
tx_outs = []
amount = amount_available
for i in range(num_outputs):
target_address = input("Enter address of recipient: ")
target_h160 = decode_base58(target_address)
valid_amount = False
target_amount = int(float(input("How much would you like to pay them (in tBTC)? ")) * sat_in_bit)
while(valid_amount == False):
if(target_amount > amount):
print("Insufficient Funds")
target_amount = int(float(input("How much would you like to pay them (in tBTC)? ")) * sat_in_bit)
else:
print("Sufficient Funds")
valid_amount = True
amount = amount - target_amount
print(str(amount/sat_in_bit)+" tBTC remaining")
if(target_address[0]=='2'):
print("This recipient is a P2SH")
target_script = p2sh_script(target_h160)
tx_outs.append(TxOut(amount = target_amount, script_pubkey = target_script))
else:
print("This recipient is a P2PKH")
target_script = p2pkh_script(target_h160)
tx_outs.append(TxOut(amount = target_amount, script_pubkey = target_script))
if(amount > 0):
print("There is a remainder of "+str(amount/sat_in_bit)+" tBTC. Please fill in recipient details:")
target_address = input("Enter address of recipient: ")
target_h160 = decode_base58(target_address)
target_amount = amount
if(target_address[0]=='2'):
print("This recipient is a P2SH")
target_script = p2sh_script(target_h160)
tx_outs.append(TxOut(amount = target_amount, script_pubkey = target_script))
else:
print("This recipient is a P2PKH")
target_script = p2pkh_script(target_h160)
tx_outs.append(TxOut(amount = target_amount, script_pubkey = target_script))
return tx_outs
def test_exercise_5(self):
prev_tx_1 = bytes.fromhex(
'11d05ce707c1120248370d1cbf5561d22c4f83aeba0436792c82e0bd57fe2a2f')
prev_index_1 = 1
prev_tx_2 = bytes.fromhex(
'51f61f77bd061b9a0da60d4bedaaf1b1fad0c11e65fdc744797ee22d20b03d15')
prev_index_2 = 1
target_address = 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv'
target_amount = 0.0429
secret = 8675309
priv = PrivateKey(secret=secret)
tx_ins = []
tx_ins.append(TxIn(prev_tx_1, prev_index_1, Script([]), 0xffffffff))
tx_ins.append(TxIn(prev_tx_2, prev_index_2, Script([]), 0xffffffff))
tx_outs = []
h160 = decode_base58(target_address)
script_pubkey = p2pkh_script(h160)
target_satoshis = int(target_amount * 100000000)
tx_outs.append(TxOut(target_satoshis, script_pubkey))
tx_obj = Tx(1, tx_ins, tx_outs, 0, testnet=True)
self.assertTrue(tx_obj.sign_input(0, priv))
self.assertTrue(tx_obj.sign_input(1, priv))
self.assertTrue(tx_obj.verify())
want = '01000000022f2afe57bde0822c793604baae834f2cd26155bf1c0d37480212c107e75cd011010000006a47304402204cc5fe11b2b025f8fc9f6073b5e3942883bbba266b71751068badeb8f11f0364022070178363f5dea4149581a4b9b9dbad91ec1fd990e3fa14f9de3ccb421fa5b269012103935581e52c354cd2f484fe8ed83af7a3097005b2f9c60bff71d35bd795f54b67ffffffff153db0202de27e7944c7fd651ec1d0fab1f1aaed4b0da60d9a1b06bd771ff651010000006b483045022100b7a938d4679aa7271f0d32d83b61a85eb0180cf1261d44feaad23dfd9799dafb02205ff2f366ddd9555f7146861a8298b7636be8b292090a224c5dc84268480d8be1012103935581e52c354cd2f484fe8ed83af7a3097005b2f9c60bff71d35bd795f54b67ffffffff01d0754100000000001976a914ad346f8eb57dee9a37981716e498120ae80e44f788ac00000000'
self.assertEqual(tx_obj.serialize().hex(), want)
def test_exercise_4(self):
last_block_hex = '000000000d65610b5af03d73ed67704713c9b734d87cf4b970d39a0416dd80f9'
last_block = bytes.fromhex(last_block_hex)
secret = little_endian_to_int(
hash256(b'Jimmy Song Programming Blockchain'))
private_key = PrivateKey(secret=secret)
addr = private_key.point.address(testnet=True)
h160 = decode_base58(addr)
target_address = 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv'
self.assertEqual(addr, target_address)
filter_size = 30
filter_num_functions = 5
filter_tweak = 90210 # FILL THIS IN
target_h160 = decode_base58(target_address)
target_script = p2pkh_script(target_h160)
fee = 5000 # fee in satoshis
node = SimpleNode('tbtc.programmingblockchain.com',
testnet=True,
logging=False)
bf = BloomFilter(filter_size, filter_num_functions, filter_tweak)
bf.add(h160)
node.handshake()
node.send(b'filterload', bf.filterload())
getheaders_message = GetHeadersMessage(start_block=last_block)
node.send(getheaders_message.command, getheaders_message.serialize())
headers_envelope = node.wait_for_commands([HeadersMessage.command])
stream = headers_envelope.stream()
headers = HeadersMessage.parse(stream)
get_data_message = GetDataMessage()
for block in headers.blocks:
self.assertTrue(block.check_pow())
if last_block is not None:
self.assertEqual(block.prev_block, last_block)
last_block = block.hash()
get_data_message.add_data(FILTERED_BLOCK_DATA_TYPE, last_block)
node.send(get_data_message.command, get_data_message.serialize())
prev_tx = None
while prev_tx is None:
envelope = node.wait_for_commands([b'merkleblock', b'tx'])
stream = envelope.stream()
if envelope.command == b'merkleblock':
mb = MerkleBlock.parse(stream)
self.assertTrue(mb.is_valid())
else:
prev = Tx.parse(stream, testnet=True)
for i, tx_out in enumerate(prev.tx_outs):
if tx_out.script_pubkey.address(testnet=True) == addr:
prev_tx = prev.hash()
prev_index = i
prev_amount = tx_out.amount
break
tx_in = TxIn(prev_tx, prev_index)
output_amount = prev_amount - fee
tx_out = TxOut(output_amount, target_script)
tx_obj = Tx(1, [tx_in], [tx_out], 0, testnet=True)
tx_obj.sign_input(0, private_key)
self.assertEqual(
tx_obj.serialize().hex(),
'010000000194e631abb9e1079ec72a1616a3aa0111c614e65b96a6a4420e2cc6af9e6cc96e000000006a47304402203cc8c56abe1c0dd043afa9eb125dafbebdde2dd4cd7abf0fb1aae0667a22006e02203c95b74d0f0735bbf1b261d36e077515b6939fc088b9d7c1b7030a5e494596330121021cdd761c7eb1c90c0af0a5963e94bf0203176b4662778d32bd6d7ab5d8628b32ffffffff01f8829800000000001976a914ad346f8eb57dee9a37981716e498120ae80e44f788ac00000000'
)
def test_exercise_6(self):
last_block_hex = '000000000d65610b5af03d73ed67704713c9b734d87cf4b970d39a0416dd80f9'
secret = little_endian_to_int(
hash256(b'Jimmy Song Programming Blockchain'))
private_key = PrivateKey(secret=secret)
addr = private_key.point.address(testnet=True)
h160 = decode_base58(addr)
target_address = 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv'
self.assertEqual(addr, target_address)
target_h160 = decode_base58(target_address)
target_script = p2pkh_script(target_h160)
fee = 5000
node = SimpleNode('tbtc.programmingblockchain.com', testnet=True)
bf = BloomFilter(30, 5, 90210)
bf.add(h160)
node.handshake()
node.send(bf.filterload())
start_block = bytes.fromhex(last_block_hex)
getheaders = GetHeadersMessage(start_block=start_block)
node.send(getheaders)
headers = node.wait_for(HeadersMessage)
last_block = None
getdata = GetDataMessage()
for b in headers.blocks:
if not b.check_pow():
raise RuntimeError('proof of work is invalid')
if last_block is not None and b.prev_block != last_block:
raise RuntimeError('chain broken')
getdata.add_data(FILTERED_BLOCK_DATA_TYPE, b.hash())
last_block = b.hash()
node.send(getdata)
prev_tx, prev_index, prev_tx_obj = None, None, None
while prev_tx is None:
message = node.wait_for(MerkleBlock, Tx)
if message.command == b'merkleblock':
if not message.is_valid():
raise RuntimeError('invalid merkle proof')
else:
message.testnet = True
for i, tx_out in enumerate(message.tx_outs):
if tx_out.script_pubkey.address(testnet=True) == addr:
prev_tx = message.hash()
prev_index = i
prev_amount = tx_out.amount
self.assertEqual(
message.id(),
'6ec96c9eafc62c0e42a4a6965be614c61101aaa316162ac79e07e1b9ab31e694'
)
self.assertEqual(i, 0)
break
tx_in = TxIn(prev_tx, prev_index)
output_amount = prev_amount - fee
tx_out = TxOut(output_amount, target_script)
tx_obj = Tx(1, [tx_in], [tx_out], 0, testnet=True)
tx_obj.sign_input(0, private_key)
self.assertEqual(
tx_obj.serialize().hex(),
'010000000194e631abb9e1079ec72a1616a3aa0111c614e65b96a6a4420e2cc6af9e6cc96e000000006a47304402203cc8c56abe1c0dd043afa9eb125dafbebdde2dd4cd7abf0fb1aae0667a22006e02203c95b74d0f0735bbf1b261d36e077515b6939fc088b9d7c1b7030a5e494596330121021cdd761c7eb1c90c0af0a5963e94bf0203176b4662778d32bd6d7ab5d8628b32ffffffff01f8829800000000001976a914ad346f8eb57dee9a37981716e498120ae80e44f788ac00000000'
)
def test_example_5(self):
tx_ins = []
prev_tx = bytes.fromhex('0d6fe5213c0b3291f208cba8bfb59b7476dffacc4e5cb66f6eb20a080843a299')
prev_index = 13
tx_ins.append(TxIn(prev_tx, prev_index, Script([]), 0xffffffff))
tx_outs = []
change_amount = int(0.33 * 100000000)
change_h160 = decode_base58('mzx5YhAH9kNHtcN481u6WkjeHjYtVeKVh2')
change_script = p2pkh_script(change_h160)
tx_outs.append(TxOut(change_amount, change_script))
target_amount = int(0.1 * 100000000)
target_h160 = decode_base58('mnrVtF8DWjMu839VW3rBfgYaAfKk8983Xf')
target_script = p2pkh_script(target_h160)
tx_outs.append(TxOut(target_amount, target_script))
transaction = Tx(1, tx_ins, tx_outs, 0, testnet=True)
want = '010000000199a24308080ab26e6fb65c4eccfadf76749bb5bfa8cb08f291320b3c21e56f0d0d00000000ffffffff02408af701000000001976a914d52ad7ca9b3d096a38e752c2018e6fbc40cdf26f88ac80969800000000001976a914507b27411ccf7f16f10297de6cef3f291623eddf88ac00000000'
self.assertEqual(transaction.serialize().hex(), want)
def sig_hash_bip143(self,
input_index,
redeem_script=None,
witness_script=None):
'''Returns the integer representation of the hash that needs to get
signed for index input_index'''
tx_in = self.tx_ins[input_index]
print("****** in sig_hash_bip143")
# per BIP143 spec
s = int_to_little_endian(self.version,
4) # applicable to all tx_ins in this tx
s += self.hash_prevouts() + self.hash_sequence(
) # applicable to all tx_ins in this tx
s += tx_in.prev_tx[::-1] + int_to_little_endian(
tx_in.prev_index, 4) # specific to this tx_in
#
# Setting the script_code:
#
# If there is a witness_script, then the situation is either a p2wsh
# or a p2sh-p2wsh. Use the witnesss script to make the script_code:
if witness_script:
script_code = witness_script.serialize()
# If there is a redeem_script, then the situation is a p2sh-p2wpkh.
# Make the script_code from the hash in the redeem_script-which is the
# 20-byte public key hash.
elif redeem_script:
script_code = p2pkh_script(redeem_script.cmds[1]).serialize()
# If no witness_script or redeem_script, the situation is a straight
# p2wpkh. Use the 20 byte hash from the utxo script_pubkey.
else:
script_code = p2pkh_script(
tx_in.script_pubkey(self.testnet).cmds[1]).serialize()
s += script_code # specific to this tx_ins
s += int_to_little_endian(tx_in.value(), 8) # specific to this tx_ins
s += int_to_little_endian(tx_in.sequence, 4) # specific to this tx_ins
s += self.hash_outputs() # applicable to all tx_ins in this tx
s += int_to_little_endian(self.locktime,
4) # applicable to all tx_ins in this tx
s += int_to_little_endian(SIGHASH_ALL,
4) # applicable to all tx_ins in this tx
print("****** out sig_hash_bip143")
return int.from_bytes(hash256(s), 'big')
def send(self, adddress, amount, fee=500):
# collect inputs
unspent = self.unspent()
tx_ins = []
input_sum = 0
for utxo in unspent:
if input_sum >= amount + fee:
break
input_sum += utxo.amount
tx_in = TxIn(utxo.tx_id, utxo.index)
tx_ins.append(tx_in)
# make sure we have enough
assert input_sum > amount + fee, 'not enough satoshis'
# send output
send_h160 = decode_base58(address)
send_script = p2pkh_script(send_h160)
send_output = TxOut(amount=amount, script_pubkey=send_script)
# change output
change_amount = input_sum - amount - fee
change_h160 = decode_base58(self.address())
change_script = p2pkh_script(change_h160)
change_output = TxOut(amount=amount, script_pubkey=change_script)
# construct
tx = Tx(1, tx_ins, [send_output, change_output], 0, True)
# sign
for i in range(len(tx_ins)):
utxo = unspent[i]
assert tx.sign_input(i, self.private_key, utxo.script_pubkey)
print(f'signed {i}')
print(tx)
# broadcast
import bit
tx_hex = tx.serialize().hex()
print(tx_hex)
# raises a ConnectionError if it fails
print(bit.network.NetworkAPI.broadcast_tx_testnet(tx_hex))
def test_exercise_3_1(self):
prev_tx = bytes.fromhex(
'eb581753a4dbd6befeaaaa28a6f4576698ba13a07c03da693a65bce11cf9887a')
prev_index = 1
target_address = 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv'
target_amount = 0.04
change_address = 'mzx5YhAH9kNHtcN481u6WkjeHjYtVeKVh2'
fee = 50000
secret = 8675309
private_key = PrivateKey(secret=secret)
tx_ins = []
tx_ins.append(TxIn(prev_tx, prev_index))
tx_outs = []
h160 = decode_base58(target_address)
script_pubkey = p2pkh_script(h160)
target_satoshis = int(target_amount * 100000000)
tx_outs.append(TxOut(target_satoshis, script_pubkey))
h160 = decode_base58(change_address)
script_pubkey = p2pkh_script(h160)
prev_amount = tx_ins[0].value(testnet=True)
change_satoshis = prev_amount - target_satoshis - fee
tx_outs.append(TxOut(change_satoshis, script_pubkey))
tx_obj = Tx(1, tx_ins, tx_outs, 0, testnet=True)
tx_obj.sign_input(0, private_key)
if private_key.point.address(testnet=True) != change_address:
raise RuntimeError(
'Private Key does not correspond to Change Address, check priv_key and change_address'
)
if tx_ins[0].script_pubkey(
testnet=True).instructions[2] != decode_base58(change_address):
raise RuntimeError(
'Output is not something you can spend with this private key. Check that the prev_tx and prev_index are correct'
)
if tx_obj.fee() > 0.05 * 100000000 or tx_obj.fee() <= 0:
raise RuntimeError(
'Check that the change amount is reasonable. Fee is {}'.format(
tx_obj.fee()))
self.assertEqual(
tx_obj.serialize().hex(),
'01000000017a88f91ce1bc653a69da037ca013ba986657f4a628aaaafebed6dba4531758eb010000006a47304402204ce6e3877ed2e18d2165276cbdba241507ce72b44d8df640eb6cb4d415eaaea002207dffd162da35593d86188ce87a1cbc9d3a5b26391870f19bf1764ca05b315ad9012103935581e52c354cd2f484fe8ed83af7a3097005b2f9c60bff71d35bd795f54b67ffffffff0200093d00000000001976a914ad346f8eb57dee9a37981716e498120ae80e44f788ac7077e401000000001976a914d52ad7ca9b3d096a38e752c2018e6fbc40cdf26f88ac00000000'
)
def test_address(self):
address_1 = '1BenRpVUFK65JFWcQSuHnJKzc4M8ZP8Eqa'
h160 = decode_base58(address_1)
p2pkh_script_pubkey = p2pkh_script(h160)
self.assertEqual(p2pkh_script_pubkey.address(), address_1)
address_2 = 'mrAjisaT4LXL5MzE81sfcDYKU3wqWSvf9q'
self.assertEqual(p2pkh_script_pubkey.address(testnet=True), address_2)
address_3 = '3CLoMMyuoDQTPRD3XYZtCvgvkadrAdvdXh'
h160 = decode_base58(address_3)
p2sh_script_pubkey = p2sh_script(h160)
self.assertEqual(p2sh_script_pubkey.address(), address_3)
address_4 = '2N3u1R6uwQfuobCqbCgBkpsgBxvr1tZpe7B'
self.assertEqual(p2sh_script_pubkey.address(testnet=True), address_4)
def test_exercise_3_2(self):
prev_tx_1 = bytes.fromhex(
'89cbfe2eddaddf1eb11f5c4adf6adaa9bca4adc01b2a3d03f8dd36125c068af4')
prev_index_1 = 0
prev_tx_2 = bytes.fromhex(
'19069e1304d95f70e03311d9d58ee821e0978e83ecfc47a30af7cd10fca55cf4')
prev_index_2 = 0
target_address = 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv'
fee = 50000
secret = 61740721216174072121
private_key = PrivateKey(secret=secret)
tx_ins = []
tx_ins.append(TxIn(prev_tx_1, prev_index_1))
tx_ins.append(TxIn(prev_tx_2, prev_index_2))
tx_outs = []
h160 = decode_base58(target_address)
script_pubkey = p2pkh_script(h160)
target_satoshis = tx_ins[0].value(True) + tx_ins[1].value(True) - fee
tx_outs.append(TxOut(target_satoshis, script_pubkey))
tx_obj = Tx(1, tx_ins, tx_outs, 0, testnet=True)
tx_obj.sign_input(0, private_key)
tx_obj.sign_input(1, private_key)
if tx_ins[0].script_pubkey(
testnet=True).instructions[2] != decode_base58(
private_key.point.address(testnet=True)):
raise RuntimeError(
'Output is not something you can spend with this private key. Check that the prev_tx and prev_index are correct'
)
if tx_obj.fee() > 0.05 * 100000000 or tx_obj.fee() <= 0:
raise RuntimeError(
'Check that the change amount is reasonable. Fee is {}'.format(
tx_obj.fee()))
self.assertEqual(
tx_obj.serialize().hex(),
'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'
)
def test_exercise_6(self):
last_block_hex = '00000000000538d5c2246336644f9a4956551afb44ba47278759ec55ea912e19'
secret = little_endian_to_int(
hash256(b'Jimmy Song Programming Blockchain'))
private_key = PrivateKey(secret=secret)
addr = private_key.point.address(testnet=True)
h160 = decode_base58(addr)
target_address = 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv'
self.assertEqual(addr, target_address)
target_h160 = decode_base58(target_address)
target_script = p2pkh_script(target_h160)
fee = 5000
node = SimpleNode('tbtc.programmingblockchain.com', testnet=True)
bf = BloomFilter(30, 5, 90210)
bf.add(h160)
node.handshake()
node.send(b'filterload', bf.filterload())
start_block = bytes.fromhex(last_block_hex)
getheaders_message = GetHeadersMessage(start_block=start_block)
node.send(getheaders_message.command, getheaders_message.serialize())
headers_envelope = node.wait_for_commands({HeadersMessage.command})
stream = headers_envelope.stream()
headers = HeadersMessage.parse(stream)
last_block = None
get_data_message = GetDataMessage()
for b in headers.blocks:
if not b.check_pow():
raise RuntimeError('proof of work is invalid')
if last_block is not None and b.prev_block != last_block:
raise RuntimeError('chain broken')
get_data_message.add_data(FILTERED_BLOCK_DATA_TYPE, b.hash())
last_block = b.hash()
node.send(get_data_message.command, get_data_message.serialize())
prev_tx, prev_index, prev_tx_obj = None, None, None
while prev_tx is None:
envelope = node.wait_for_commands({b'merkleblock', b'tx'})
stream = envelope.stream()
if envelope.command == b'merkleblock':
mb = MerkleBlock.parse(stream)
if not mb.is_valid():
raise RuntimeError('invalid merkle proof')
else:
prev_tx_obj = Tx.parse(stream, testnet=True)
for i, tx_out in enumerate(prev_tx_obj.tx_outs):
if tx_out.script_pubkey.address(testnet=True) == addr:
prev_tx = prev_tx_obj.hash()
prev_index = i
self.assertEqual(
prev_tx_obj.id(),
'e3930e1e566ca9b75d53b0eb9acb7607f547e1182d1d22bd4b661cfe18dcddf1'
)
self.assertEqual(i, 0)
tx_in = TxIn(prev_tx, prev_index, Script([]), 0xffffff)
TxFetcher.cache[prev_tx] = prev_tx_obj
tx_ins = [tx_in]
total = prev_tx_obj.tx_outs[prev_index].amount
tx_outs = [TxOut(total - fee, target_script)]
tx_obj = Tx(1, tx_ins, tx_outs, 0, testnet=True)
tx_obj.sign_input(0, private_key)
self.assertEqual(
tx_obj.serialize().hex(),
'0100000001f1dddc18fe1c664bbd221d2d18e147f50776cb9aebb0535db7a96c561e0e93e3000000006a473044022046a49962540a89e83da0636455b6c81c11c2844b7f3cd414c02e1a13741f4d15022006eed4eeda994d2bfebb9f1a494bfa3c8bab96e7e4c82623f4a29736dfe309e70121021cdd761c7eb1c90c0af0a5963e94bf0203176b4662778d32bd6d7ab5d8628b32ffffff0001a1629ef5000000001976a914ad346f8eb57dee9a37981716e498120ae80e44f788ac00000000'
)
def test_create_legacy_tx():
# to_alice = total_amount - to_bob - fee
txo_amount = 0.01750649
tx_fee = 0.0005
to_bob = 0.005
sat_amount = int(txo_amount * 10 ** 8)
sat_tx_fee = int(tx_fee * 10 ** 8)
sat_to_bob = int(to_bob * 10 ** 8)
sat_to_alice = sat_amount - sat_to_bob - sat_tx_fee
# add txo: to alice
alice = 'mxFMySFd6tkjnomB1LgGC85i5hvwGtaFiW'
h160 = util.decode_base58(alice)
print(h160.hex())
lock_script = script.p2pkh_script(h160)
txo_0 = {
"amount": sat_to_alice,
"script": lock_script
}
# add txo: to bob
bob = "mtTt5dA1vbELiycUagedatkPQRm1QseoCa"
h160 = util.decode_base58(bob)
print(h160.hex())
lock_script = script.p2pkh_script(h160)
txo_1 = {
"amount": sat_to_bob,
"script": lock_script
}
# add_txi
txid = "dd21423466a93ccca9ea5b548e0c19efcfc3aee41036a90102bca600cd9260fb"
# "asm": "OP_DUP OP_HASH160 e4c8b088f49dbc6a2248400e5002d2a29aed6953 OP_EQUALVERIFY OP_CHECKSIG",
# generate unlock script
prev_tx = tx.fetch(bytes.fromhex(txid), True)
print(prev_tx)
for i, txo in enumerate(prev_tx['txos']):
if script.is_p2pkh(txo['script']):
print(i, "p2pkh")
elif script.is_p2sh(txo['script']):
print(i, "p2sh")
elif script.is_p2wpkh(txo['script']):
print(i, "p2wpkh")
elif script.is_p2wsh(txo['script']):
print(i, "pswsh")
# lock_script: p2pkh
txi_0 = {
"txid": bytes.fromhex(txid),
"idx": 1,
"script": [],
"seq.no": 0
}
tx_obj = {
"version": 1,
# "mark": None,
# "flag": None,
"txi.count": 1,
"txis": [txi_0],
"txo.count": 2,
"txos": [txo_0, txo_1],
# "wits": None,
"locktime": 0
}
# alice's 'sec_key': 947605268396919657983759089664,
sec_key = 947605268396919657983759089664
z = tx.sig_hash(tx_obj, 0, prev_tx["txos"][1]["script"])
print(z)
sig = ecc.sig(sec_key, z)
der = ecc.sig_der(sig)
pub_key = ecc.ecc_mul(sec_key)
sec = ecc.sec(pub_key[0], pub_key[1], False)
print(sec)
sig_with_type = der + util.SIGHASH_ALL.to_bytes(1, 'big')
txi_0["script"] = [sig_with_type, sec]
print(tx_obj)
new_tx_bytes = tx.serialize(tx_obj)
print(new_tx_bytes.hex())
# tx verification
stream = BytesIO(new_tx_bytes)
tx_obj = tx.parse(stream)
print(tx_obj)
tx.verify(tx_obj, testnet=True)
return new_tx_bytes
# UTXO that we gonna receive
prev_tx = bytes.fromhex(
'1ed5583812bda08b71a71c2fa1e6788dac956efa9d2c26b6c9fd10f6e885658f')
prev_index = 1
# create the txin with the output of the UTXO we have been given
tx_in = TxIn(prev_tx, prev_index)
tx_outs = []
change_amount = int(0.00003 * 100000000)
# output address that will receive the sat we have not spend
change_h160 = decode_base58('mvEg6eZ3sUApodedYQrkpEPMMALsr1K1k1')
change_script = p2pkh_script(change_h160)
change_output = TxOut(amount=change_amount, script_pubkey=change_script)
# output address that will receive our sat
target_amount = int(0.00006 * 100000000)
target_h160 = decode_base58('mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv')
target_script = p2pkh_script(target_h160)
target_output = TxOut(amount=target_amount, script_pubkey=target_script)
tx_obj = Tx(1, [tx_in], [change_output, target_output], 0, True)
#print(tx_obj).hex()
# now we sign the transaction
z = tx_obj.sig_hash(0)
tx_previa = bytes.fromhex(
'b685879f3939fa9531899b729394ed85edab8b6850b72a9e378ea31af96a304a')
index_tx_previa = 1
tx_inputs = []
tx_inputs.append(TxIn(tx_previa, index_tx_previa))
#OUPUTS
tx_outputs = []
destinatario = 'mv4rnyY3Su5gjcDNzbMLKBQkBicCtHUtFB'
monto = .00008
change_adress = ADDRESS
cambio = .00001
#SEND OUTPUT
h160 = decode_base58(destinatario)
script_pubkey = p2pkh_script(h160)
monto_satoshis = int(monto * 100_000_000)
tx_outputs.append(TxOut(monto_satoshis, script_pubkey))
#CHANGE OUPUT
h160 = decode_base58(change_adress)
script_pubkey = p2pkh_script(h160)
cambio_satoshis = int(cambio * 100_000_000)
tx_outputs.append(TxOut(cambio_satoshis, script_pubkey))
#TX BUILD
TX_BUILD = Tx(1, tx_inputs, tx_outputs, 0, testnet=True)
#SIGN
print(TX_BUILD.sign_input(0, PrivKey))
print(TX_BUILD.serialize().hex())
def pubkey_to_p2pkh_script(cls, pubkey):
h160 = pubkey.hash160()
return p2pkh_script(h160)
pay_private_key = PrivateKey(pay_secret)
output_address = pay_private_key.point.address(testnet=True)
# out1_address resulting from the above pay_secret
# out1_address = 'mgbxvp8L3o5zbw8P81VWVv42gUj9eZNjAN'
change_secret = 9883161471906162552674337436001522581212416354973578695250248738884382136882
#secret = random.getrandbits(256)
change_private_key = PrivateKey(change_secret)
change_address = change_private_key.point.address(testnet=True)
paying_amount = prev_tx_obj.tx_outs[0].amount
paid_amount = math.floor(paying_amount * .1)
fee = math.floor(paid_amount * .1)
change_amount = paying_amount - paid_amount - fee
paid_script = p2pkh_script(decode_base58(output_address))
change_script = p2pkh_script(decode_base58(change_address))
tx_out_paid = TxOut(paid_amount, paid_script)
tx_out_change = TxOut(change_amount, change_script)
tx = Tx(1, [txi], [tx_out_paid, tx_out_change], 0, True)
print(tx)
print(tx.sign_input(input_index=0, private_key=input_private_key))
print(tx)
print("tx_in script...")
print(tx.tx_ins[0].script_sig)
print(tx.serialize().hex())
def construct_tx_out(address, amount):
h160 = decode_base58(address)
script = p2pkh_script(h160)
return TxOut(amount=amount, script_pubkey=script)
'df29440e796ff7e843d643380d00b79f0d6dab55c84a983849b04f9a8025f072')
prev_index1 = 0
prev_tx2 = bytes.fromhex(
'df29440e796ff7e843d643380d00b79f0d6dab55c84a983849b04f9a8025f072')
prev_index2 = 0
# create the txin with the output of the UTXO we have been given
tx_in1 = TxIn(prev_tx1, prev_index1)
tx_in2 = TxIn(prev_tx1, prev_index1)
target_amount = int(9000)
# output address that will receive the sat we have not spend
target_h160 = decode_base58('mvEg6eZ3sUApodedYQrkpEPMMALsr1K1k1')
target_script = p2pkh_script(target_h160)
target_output = TxOut(amount=target_amount, script_pubkey=target_script)
# output address that will receive our sat
target_script = p2pkh_script(target_h160)
target_output = TxOut(amount=target_amount, script_pubkey=target_script)
tx_obj = Tx(1, [tx_in], [target_output], 0, True)
#print(tx_obj).hex()
# now we sign the transaction
z = tx_obj.sig_hash(0)
private_key = PrivateKey(little_endian_to_int(
hash256(b'dat_test_private_key')))
der = private_key.sign(z).der()
def test_broadcast(self):
from bloomfilter import BloomFilter
last_block_hex = '00000000000000a03f9432ac63813c6710bfe41712ac5ef6faab093fe2917636'
secret = little_endian_to_int(hash256(b'Jimmy Song'))
private_key = PrivateKey(secret=secret)
h160 = private_key.point.hash160()
addr = private_key.point.address(testnet=True)
target_address = 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv'
target_h160 = decode_base58(target_address)
target_script = p2pkh_script(target_h160)
fee = 5000 # fee in satoshis
# connect to programmingblockchain.com in testnet mode
node = SimpleNode('programmingblockchain.com', testnet=True)
# create a bloom filter of size 30 and 5 functions. Add a tweak.
bf = BloomFilter(30, 5, 90210)
# add the h160 to the bloom filter
bf.add(h160)
# load the bloom filter with the filterload command
node.send(bf.filterload())
# set start block to last_block from above
start_block = bytes.fromhex(last_block_hex)
# send a getheaders message with the starting block
getheaders = GetHeadersMessage(start_block=start_block)
node.send(getheaders)
# wait for the headers message
headers = node.wait_for(HeadersMessage)
block_hashes = [b.hash() for b in headers.blocks]
# initialize prev_tx, prev_index and prev_amount to None
prev_tx, prev_index, prev_amount = None, None, None
for h, tx_obj in node.get_filtered_block_txs(block_hashes):
self.assertEqual(h, tx_obj.hash())
tx_obj.testnet = True
# loop through the tx outs
for i, tx_out in enumerate(tx_obj.tx_outs):
# if our output has the same address as our address we found it
if tx_out.script_pubkey.address(testnet=True) == addr:
# we found our utxo. set prev_tx, prev_index, and tx
prev_tx = h
prev_index = i
prev_amount = tx_out.amount
self.assertEqual(
h.hex(),
'b2cddd41d18d00910f88c31aa58c6816a190b8fc30fe7c665e1cd2ec60efdf3f'
)
self.assertEqual(i, 7)
break
if prev_tx:
break
# create the TxIn
tx_in = TxIn(prev_tx, prev_index)
# calculate the output amount (previous amount minus the fee)
output_amount = prev_amount - fee
# create a new TxOut to the target script with the output amount
tx_out = TxOut(output_amount, target_script)
# create a new transaction with the one input and one output
tx_obj = Tx(1, [tx_in], [tx_out], 0, testnet=True)
# sign the only input of the transaction
self.assertTrue(tx_obj.sign_input_p2pkh(0, private_key))
# serialize and hex to see what it looks like
want = '01000000013fdfef60ecd21c5e667cfe30fcb890a116688ca51ac3880f91008dd141ddcdb2070000006b483045022100ff77d2559261df5490ed00d231099c4b8ea867e6ccfe8e3e6d077313ed4f1428022033a1db8d69eb0dc376f89684d1ed1be75719888090388a16f1e8eedeb8067768012103dc585d46cfca73f3a75ba1ef0c5756a21c1924587480700c6eb64e3f75d22083ffffffff019334e500000000001976a914ad346f8eb57dee9a37981716e498120ae80e44f788ac00000000'
self.assertEqual(tx_obj.serialize().hex(), want)
# send this signed transaction on the network
node.send_tx(tx_obj)
def output_from_address(cls, address, amount):
# creates an output from the Base 58 Checksum string
# the Base 58 Checksum string is what a payor would receive from the payee
hash160_bytes = decode_base58(address)
script_pub_key = p2pkh_script(hash160_bytes)
return cls(amount, script_pub_key)
