def check_pow(self):
'''Returns whether this block satisfies proof of work'''
dat_hash = hash256(self.serialize())
dat_hash = little_endian_to_int(dat_hash)
return dat_hash < self.target()
def op_hash256(stack):
if len(stack) < 1:
return False
element = stack.pop()
stack.append(hash256(element))
return True
from ecc import PrivateKey from helper import hash256, little_endian_to_int mypass = b'KBU_201601071_PARKDONGHYUNE' mysecret = little_endian_to_int(hash256(mypass)) P = PrivateKey(mysecret) print(P.point.address(testnet=True))
from helper import decode_base58, little_endian_to_int, hash256, SIGHASH_ALL
from script import p2pkh_script, Script
from tx import TxIn, TxOut, Tx
from ecc import PrivateKey
secret1 = little_endian_to_int(hash256(b'dat_test_private_key_p2sh1'))
secret2 = little_endian_to_int(hash256(b'dat_test_private_key2_p2sh2'))
## first we create the scriptPubKey of the redeemscript or redeem script
# we decode our previous pubkey to put them in script commands
private_key1 = PrivateKey(secret1)
private_key2 = PrivateKey(secret2)
print(private_key1.point.address(testnet=True))
print(private_key2.point.address(testnet=True))
public_key1 = decode_base58('mvEg6eZ3sUApodedYQrkpEPMMALsr1K1k1')
public_key2 = decode_base58('mwjg9Y1jeFdNu7DQBAW7DUbJqj6jMmhd74')
dat_redeem_script_op = Script([0x52, public_key1, public_key2, 0x52, 0xae])
# make a transact to mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv with 60% of a UTXO and send back the change
secret = little_endian_to_int(hash256(b'dat_test_private_key'))
private_key = PrivateKey(secret)
"""
"""
dat_s = io.BytesIO(b'abc')
print(little_endian_to_int(dat_s.read(4)))
"""
from helper import decode_base58, little_endian_to_int, hash256, SIGHASH_ALL
from script import p2pkh_script, Script
from tx import TxIn, TxOut, Tx
from ecc import PrivateKey
# make a transact to mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv with 60% of a UTXO and send back the change
secret = little_endian_to_int(hash256(b'dat_test_private_key'))
private_key = PrivateKey(secret)
print(private_key.point.address(testnet=True, dat_h160=False))
# 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)
def hash(self):
return hash256(self.serialize())[::-1]
def check_pow(self):
h256 = hash256(self.serialize())
proof = little_endian_to_int(h256)
return proof < self.target()
def hash(self):
s = self.serialize()
sha = hash256(s)
return sha[::-1]
z = 0xec208baa0fc1c19f708a9ca96fdeff3ac3f230bb4a7ba4aede4942ad003c0f60 r = 0xac8d1c87e51d0d441be8b3dd5b05c8795b48875dffe00b7ffcfac23010d3a395 s = 0x68342ceff8935ededd102dd876ffd6ba72d6a427a3edb13d26eb0781cb423c4 s_inv = pow(s, N - 2, N) u = z * s_inv % N v = r * s_inv % N print(((u * G) + (v * Point)).x.num == r) #2 z = 0x7c076ff316692a3d7eb3c3bb0f8b1488cf72e1afcd929e29307032997a838a3d r = 0xeff69ef2b1bd93a66ed5219add4fb51e11a840f404876325a1e8ffe0529a2c s = 0xc7207fee197d27c618aea621406f6bf5ef6fca38681d82b2f06fddbdce6feab6 s_inv = pow(s, N - 2, N) u = z * s_inv % N v = r * s_inv % N print((u * G + v * Point).x.num == r) e = 12345 z = int.from_bytes(hash256(b'Programming Bitcoin!'), 'big') k = 3333 r = (k * G).x.num k_inv = pow(k, N - 2, N) s = (z + r * 2) * k_inv % N Point = e * G print(Point) print(hex(z)) print(hex(r))
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()
sig = der + SIGHASH_ALL.to_bytes(1, 'big')
sec = private_key.point.sec()
script_sig = Script([sig, sec])
tx_obj.tx_ins[0].script_sig = script_sig
print(tx_obj.serialize().hex())
# end
der = bytes.fromhex(hex_der)
redeem_script = Script.parse(BytesIO(bytes.fromhex(hex_redeem_script)))
stream = BytesIO(bytes.fromhex(hex_tx))
tx = Tx.parse(stream, False)
dat_s = int_to_little_endian(tx.version, 4)
dat_s += encode_varint(len(tx.tx_ins))
dat_s += TxIn(
prev_tx = tx.tx_ins[0].prev_tx,
prev_index = tx.tx_ins[0].prev_index,
script_sig = redeem_script,
sequence = tx.tx_ins[0].sequence,
).serialize()
dat_s += encode_varint(len(tx.tx_outs))
for tx_out in tx.tx_outs:
dat_s += tx_out.serialize()
dat_s += int_to_little_endian(tx.locktime, 4)
dat_s += int_to_little_endian(SIGHASH_ALL, 4)
dat_h256 = hash256(dat_s)
dat_z = int.from_bytes(dat_h256, 'big')
dat_256Point = S256Point.parse(sec)
dat_sig = Signature.parse(der)
#dat_combined = redeem_script + dat_S
print(dat_256Point.verify(dat_z, dat_sig))
# dat_s = little_endian_to_int(stream.read(4))
# dat_s = read_varint(stream)
#dat_s = int_to_little_endian(stream, stream.read(4))
def hash256(self):
h256 = hash256(self.serialize())
return h256[::-1]
def hash(self):
block_hash = hash256(self.serialize())
return block_hash[::-1]
def hash(self):
'''Returns the hash256 interpreted little endian of the block'''
return hash256(self.serialize())[::-1]
def createAddress(passphrase):
secret = little_endian_to_int(hash256(passphrase))
publicKey = PrivateKey(secret).point
address = publicKey.address(testnet=True)
return address
def is_unspent(txid, index, proxy):
return proxy.gettxout(txid, index) == None
p = RawProxy(service_port=18332)
# Sender Information
sender_secret = b'[email protected] Tranquility Cracks is a hidden gem that many seek but few find'
secret = little_endian_to_int(hash256(sender_secret))
private_key = PrivateKey(secret)
public_key = private_key.point
sender_address = public_key.address(testnet=True)
# Receiver Information
receiver_address = createAddress(b'some salt for this receiver address')
# What is in our wallet that we can spend? (this one has 0.01 tBTC)
tx_in_id = 'acf22005638e60379aa43d4cd2a5eb47a0fa1fefc5883eecf83329a607431d50'
tx_in_index = 1
tx_input = TxIn(bytes.fromhex(tx_in_id), tx_in_index)
# Checking spentness of the inputs. Should be False
print("Spentness of input " + str(tx_in_index) + ": " +
str(is_unspent(tx_in_id, tx_in_index, p)))
def update(self, stop_height=None):
if stop_height is None:
stop_height = self.node.latest_block
start_height = self.store_height()
previous = self.headers[-1]
# find the first epoch timestamp
epoch_first_block = self.headers[(len(self.headers) // 2016) * 2016]
epoch_first_timestamp = epoch_first_block.timestamp
epoch_bits = epoch_first_block.bits
# download blocks we don't have
current_height = start_height + 1
while current_height <= stop_height:
LOGGER.info('downloading headers {} to {}'.format(current_height, current_height+1999))
# ask for headers
getheaders = GetHeadersMessage(start_block=previous.hash())
self.node.send(getheaders)
headers = self.node.wait_for(HeadersMessage)
# validate headers
for header in headers.blocks:
if not header.check_pow():
raise RuntimeError('{}: PoW is invalid'.format(current_height))
if header.prev_block != previous.hash():
raise RuntimeError('{}: not sequential'.format(current_height))
if current_height % 2016 == 0:
# difficulty adjustment
time_diff = previous.timestamp - epoch_first_timestamp
epoch_bits = calculate_new_bits(previous.bits, time_diff)
expected_bits = epoch_bits
epoch_first_timestamp = header.timestamp
elif self.testnet and header.timestamp > previous.timestamp + 20 * 60:
expected_bits = LOWEST_BITS
else:
expected_bits = epoch_bits
if header.bits != expected_bits:
raise RuntimeError('{}: bad bits {} vs {}'.format(
current_height, header.bits.hex(), expected_bits.hex()))
previous = header
current_height += 1
self.headers.append(header)
self.headers_lookup[header.hash()] = header
if current_height > stop_height:
break
LOGGER.info('downloaded headers to {} inclusive'.format(stop_height))
# download compact filter checkpoints
getcfcheckpoint = GetCFCheckPointMessage(stop_hash=self.headers[-1].hash())
self.node.send(getcfcheckpoint)
cfcheckpoint = self.node.wait_for(CFCheckPointMessage)
# download all cfheaders
prev_filter_header = b'\x00' * 32
cfcheckpoint.filter_headers.append(None)
for i, cpfilter_header in enumerate(cfcheckpoint.filter_headers):
if i == 0:
start = 0
else:
start = i * 1000 + 1
end = (i+1) * 1000
if end <= start_height:
prev_filter_header = cpfilter_header
continue
if end > stop_height:
end = stop_height
stop_hash = self.headers[-1].hash()
else:
stop_hash = self.header_by_height(end).hash()
LOGGER.info('getting filters range {} to {}'.format(start, end))
getcfheaders = GetCFHeadersMessage(
start_height=start, stop_hash=stop_hash)
self.node.send(getcfheaders)
cfheaders = self.node.wait_for(CFHeadersMessage)
if prev_filter_header != cfheaders.previous_filter_header:
raise RuntimeError('Non-sequential CF headers')
# validate all cfheaders
for j, filter_hash in enumerate(cfheaders.filter_hashes):
header = self.header_by_height(start + j)
filter_header = hash256(filter_hash[::-1] + prev_filter_header[::-1])[::-1]
prev_filter_header = filter_header
header.cfhash = filter_hash
header.cfheader = filter_header
if cpfilter_header is not None and cpfilter_header != prev_filter_header:
raise RuntimeError('CF header not what we expected')
def createAddress(passphrase):
secret = little_endian_to_int(hash256(passphrase))
publicKey = PrivateKey(secret).point
address = publicKey.address(testnet=True)
return address
def whash(self):
if not self.segwit:
return self.hash()
return hash256(self.serialize_segwit())[::-1]
def hash(self):
s = self.serialize()
h256 = hash256(s)
return h256[::-1]
def op_hash256(stack: List[bytes]) -> bool:
if len(stack) < 1:
return False
element = stack.pop()
stack.append(hash256(element))
return True
from ecc import PrivateKey
from helper import decode_base58, little_endian_to_int, hash256
from script import p2pkh_script
from tx import TxIn, TxOut, Tx
#PRIVATE KEY
SEMILLA = b'HolaHashgerTraines'
SECRETO = little_endian_to_int(hash256(SEMILLA))
PrivKey = PrivateKey(SECRETO)
print('Mi llave privada es: ', PrivKey.hex())
ADDRESS = PrivKey.point.address(testnet=True)
print('Mi direecion Bitcoin testenet es: ', ADDRESS)
#INPUTS
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)
1574e6b3c192ecfb52cc8984ee7b6c568700000000'
hex_sec = '03b287eaf122eea69030a0e9feed096bed8045c8b98bec453e1ffac7fbdbd4b\
b71'
hex_der = '3045022100da6bee3c93766232079a01639d07fa869598749729ae323eab8ee\
f53577d611b02207bef15429dcadce2121ea07f233115c6f09034c0be68db99980b9a6c5e75402\
2'
hex_redeem_script = '475221022626e955ea6ea6d98850c994f9107b036b1334f18ca88\
30bfff1295d21cfdb702103b287eaf122eea69030a0e9feed096bed8045c8b98bec453e1ffac7f\
bdbd4bb7152ae'
sec = bytes.fromhex(hex_sec)
der = bytes.fromhex(hex_der)
redeem_script = Script.parse(BytesIO(bytes.fromhex(hex_redeem_script)))
stream = BytesIO(bytes.fromhex(hex_tx))
tx_obj = Tx.parse(stream)
s = int_to_little_endian(tx_obj.version, 4)
s += encode_varint(len(tx_obj.tx_ins))
i = tx_obj.tx_ins[0]
s += TxIn(i.prev_tx, i.prev_index, redeem_script, i.sequence).serialize()
s += encode_varint(len(tx_obj.tx_outs))
for tx_out in tx_obj.tx_outs:
s += tx_out.serialize()
s += int_to_little_endian(tx_obj.locktime, 4)
s += int_to_little_endian(SIGHASH_ALL, 4)
z = int.from_bytes(hash256(s), 'big')
point = S256Point.parse(sec)
sig = Signature.parse(der)
print(point.verify(z, sig))
# signature 2 z = 0x7c076ff316692a3d7eb3c3bb0f8b1488cf72e1afcd929e29307032997a838a3d r = 0xeff69ef2b1bd93a66ed5219add4fb51e11a840f404876325a1e8ffe0529a2c s = 0xc7207fee197d27c618aea621406f6bf5ef6fca38681d82b2f06fddbdce6feab6 u = z * pow(s, N-2, N) % N v = r * pow(s, N-2, N) % N print((u * G + v * point).x.num == r) # result : True # In[16]: from ecc import S256Point, G, N from helper import hash256 e = int.from_bytes(hash256(b'my secret'), 'big') z = int.from_bytes(hash256(b'my message'), 'big') k = 1234567890 r = (k*G).x.num k_inv = pow(k, N-2, N) s = (z+r*e) * k_inv % N point = e*G print(point) print(hex(z)) print(hex(r)) print(hex(s)) # ### Exercise 7 # # Sign the following message with the secret
def test_exercise_9(self):
passphrase = b'[email protected] my secret'
secret = helper.little_endian_to_int(hash256(passphrase))
priv = PrivateKey(secret)
self.assertEqual(priv.point.address(testnet=True),
'mft9LRNtaBNtpkknB8xgm17UvPedZ4ecYL')
from ecc import PrivateKey from helper import hash256, little_endian_to_int passphrase = b'pickmeupimscared1419' secret = little_endian_to_int(hash256(passphrase)) priv = PrivateKey(secret) print(priv.point.address(testnet=True))
def test_exercise_8(self):
passphrase = b'Jimmy Song Programming Blockchain'
secret = little_endian_to_int(hash256(passphrase))
point = secret*G
self.assertEqual(point.address(testnet=True), 'mwJn1YPMq7y5F8J3LkC5Hxg9PHyZ5K4cFv')
def encode_base58_checksum(raw):
checksum = hash256(raw)[:4]
base58 = encode_base58(raw + checksum)
return base58.decode('ascii')
else:
amounts_valid = True
print("Sufficient Funds")
# get target address
target_address = input("Enter address of recipient: ")
target_h160 = decode_base58(target_address)
target_script = p2pkh_script(target_h160)
target_output = TxOut(amount = target_amount, script_pubkey = target_script)
# Sender Information
print("Enter your private key passphrase to prove that you can sign the inputs:")
password = getpass.getpass('Passphrase:')
secret = little_endian_to_int(hash256(str.encode(password)))
private_key = PrivateKey(secret)
public_key = private_key.point
sender_address = public_key.address(testnet=True)
print("Your Address: " + sender_address)
#send change back to sender
change_amount = int(amount_available - target_amount - fee_amount)
change_160 = decode_base58(sender_address)
change_script = p2pkh_script(change_160)
change_output = TxOut(amount = change_amount, script_pubkey = change_script)
#create the Tx object
tx_obj = Tx(1, tx_ins, [change_output, target_output], 0, True)
#signing the transaction
def hash(self): # <4>
'''Binary hash of the legacy serialization'''
return hash256(self.serialize())[::-1]
def __init__(self,
ft: Transaction,
id_l: Id,
id_r: Id,
val_l: float,
val_r: float,
fee: float,
timelockCT: int = consts.timelockCT):
self.ft = ft
self.id_l = id_l
self.id_r = id_r
self.fee = fee
self.timelockCT = timelockCT
self.timelock = consts.timelock
self.val_l = val_l
self.val_r = val_r
self.transactions = []
secret_rev = gen_secret()
ct_l = txs.get_standard_ct(TxInput(ft.get_txid(), 0),
id_l,
id_r,
hash256(secret_rev),
val_l,
val_r,
fee,
l=True,
timelock=0x2)
ct_script = ct_l.outputs[0].script_pubkey.script
ct_l_to_l = txs.get_standard_ct_spend(TxInput(ct_l.get_txid(),
0), id_l, ct_script,
val_l - 0.5 * self.fee, fee)
ct_l_punish = txs.get_standard_ct_punish(TxInput(ct_l.get_txid(),
0), self.id_r,
ct_script, secret_rev,
val_l - 0.5 * self.fee, fee)
self.transactions.append(('CT_l', ct_l))
self.transactions.append(('CT_l_to_l', ct_l_to_l))
self.transactions.append(
('CT_l_punish', ct_l_punish)
) # in the real world, this is added only when this state is revoked
secret_rev_r = gen_secret()
ct_r = txs.get_standard_ct(TxInput(ft.get_txid(), 0),
id_l,
id_r,
hash256(secret_rev_r),
val_l,
val_r,
fee,
l=False,
timelock=0x2)
ct_r_script = ct_r.outputs[0].script_pubkey.script
ct_r_to_r = txs.get_standard_ct_spend(TxInput(ct_r.get_txid(),
0), id_r, ct_r_script,
val_r - 0.5 * self.fee, fee)
ct_r_punish = txs.get_standard_ct_punish(TxInput(ct_r.get_txid(),
0), self.id_l,
ct_script, secret_rev_r,
val_r - 0.5 * self.fee, fee)
self.transactions.append(('CT_r', ct_l))
self.transactions.append(('CT_r_to_r', ct_r_to_r))
self.transactions.append(
('CT_r_punish', ct_r_punish)
) # in the real world, this is added only when this state is revoked
