def transaction(tx_info,
encoding,
exact_fee=None,
fee_provided=0,
unittest=False,
public_key_hex=None,
allow_unconfirmed_inputs=False):
(source, destination_outputs, data) = tx_info
if exact_fee and not isinstance(exact_fee, int):
raise exceptions.TransactionError('Exact fees must be in satoshis.')
if not isinstance(fee_provided, int):
raise exceptions.TransactionError('Fee provided must be in satoshis.')
if encoding not in ('pubkeyhash', 'multisig', 'opreturn'):
raise exceptions.TransactionError('Unknown encoding‐scheme.')
# If public key is necessary for construction of (unsigned) transaction,
# either use the public key provided, or derive it from a private key
# retrieved from wallet.
public_key = None
if encoding in ('multisig', 'pubkeyhash'):
# get the address type
pdb.set_trace()
p2sh = get_address_type(source)
if p2sh:
temp = rpc('validateaddress', [source])
redeemscript = temp['hex']
else:
# If no public key was provided, derive from private key.
if not public_key_hex:
# Get private key.
if unittest:
private_key_wif = 'cPdUqd5EbBWsjcG9xiL1hz8bEyGFiz4SW99maU9JgpL9TEcxUf3j'
else:
private_key_wif = rpc('dumpprivkey', [source])
# Derive public key.
public_key_hex = private_key_to_public_key(private_key_wif)
pubkeypair = bitcoin_utils.parse_as_public_pair(public_key_hex)
if not pubkeypair:
raise exceptions.InputError('Invalid private key.')
public_key = public_pair_to_sec(pubkeypair, compressed=True)
# Protocol change.
if encoding == 'pubkeyhash' and get_block_count(
) < 293000 and not config.TESTNET:
raise exceptions.TransactionError(
'pubkeyhash encoding unsupported before block 293000')
if config.PREFIX == config.UNITTEST_PREFIX: unittest = True
# Validate source and all destination addresses.
destinations = [address for address, value in destination_outputs]
for address in destinations + [source]:
if address:
try:
base58_decode(address, config.ADDRESSVERSION,
config.ADDRESSVERSION_MULTISIG)
except Exception: # TODO
raise exceptions.AddressError('Invalid Bitcoin address:',
address)
# Check that the source is in wallet.
if not unittest and encoding in ('multisig') and not public_key:
if not rpc('validateaddress', [source])['ismine']:
raise exceptions.AddressError('Not one of your Bitcoin addresses:',
source)
# Check that the destination output isn't a dust output.
# Set null values to dust size.
new_destination_outputs = []
for address, value in destination_outputs:
if encoding == 'multisig':
if value == None: value = config.MULTISIG_DUST_SIZE
if not value >= config.MULTISIG_DUST_SIZE:
raise exceptions.TransactionError(
'Destination output is below the dust target value.')
else:
if value == None: value = config.REGULAR_DUST_SIZE
if not value >= config.REGULAR_DUST_SIZE:
raise exceptions.TransactionError(
'Destination output is below the dust target value.')
new_destination_outputs.append((address, value))
destination_outputs = new_destination_outputs
# Divide data into chunks.
if data:
def chunks(l, n):
""" Yield successive n‐sized chunks from l.
"""
for i in range(0, len(l), n):
yield l[i:i + n]
if encoding == 'pubkeyhash':
data_array = list(chunks(data + config.PREFIX,
20 - 1)) # Prefix is also a suffix here.
elif encoding == 'multisig':
data_array = list(chunks(data, 33 - 1))
elif encoding == 'opreturn':
data_array = list(chunks(data, 80))
assert len(
data_array
) == 1 # Only one OP_RETURN output currently supported (messages should all be shorter than 80 bytes, at the moment).
else:
data_array = []
# Calculate total BTC to be sent.
btc_out = 0
if encoding == 'multisig': data_value = config.MULTISIG_DUST_SIZE
elif encoding == 'opreturn': data_value = config.OP_RETURN_VALUE
else: data_value = config.REGULAR_DUST_SIZE # Pay‐to‐PubKeyHash
btc_out = sum([data_value for data_chunk in data_array])
btc_out += sum([value for address, value in destination_outputs])
# Get size of outputs.
if encoding == 'multisig': data_output_size = 81 # 71 for the data
elif encoding == 'opreturn': data_output_size = 90 # 80 for the data
else: data_output_size = 25 + 9 # Pay‐to‐PubKeyHash (25 for the data?)
outputs_size = ((25 + 9) * len(destination_outputs)) + (len(data_array) *
data_output_size)
# Get inputs.
unspent = get_unspent_txouts(source, normalize=True, unittest=unittest)
unspent = sort_unspent_txouts(unspent, allow_unconfirmed_inputs)
inputs, btc_in = [], 0
change_quantity = 0
sufficient_funds = False
final_fee = config.FEE_PER_KB
for coin in unspent:
inputs.append(coin)
btc_in += round(coin['amount'] * config.UNIT)
# If exact fee is specified, use that. Otherwise, calculate size of tx and base fee on that (plus provide a minimum fee for selling BTC).
if exact_fee:
final_fee = exact_fee
else:
size = 181 * len(inputs) + outputs_size + 10
necessary_fee = (int(size / 10000) + 1) * config.FEE_PER_KB
final_fee = max(fee_provided, necessary_fee)
assert final_fee >= 1 * config.FEE_PER_KB
# Check if good.
change_quantity = btc_in - (btc_out + final_fee)
if change_quantity == 0 or change_quantity >= config.REGULAR_DUST_SIZE: # If change is necessary, must not be a dust output.
sufficient_funds = True
break
if not sufficient_funds:
# Approximate needed change, fee by with most recently calculated quantities.
total_btc_out = btc_out + max(change_quantity, 0) + final_fee
raise exceptions.BalanceError(
'Insufficient bitcoins at address {}. (Need approximately {} BTC.)'
.format(source, total_btc_out / config.UNIT))
# Construct outputs.
if data: data_output = (data_array, data_value)
else: data_output = None
if change_quantity: change_output = (source, change_quantity)
else: change_output = None
# Serialise inputs and outputs.
transaction = serialise(encoding,
inputs,
destination_outputs,
data_output,
change_output,
source=source,
public_key=public_key)
unsigned_tx_hex = binascii.hexlify(transaction).decode('utf-8')
return unsigned_tx_hex
def transaction (tx_info, encoding, unittest=False, public_key_hex=None, allow_unconfirmed_inputs=False):
if len(tx_info) == 3:
source, destination_outputs, data = tx_info
fee_provided = 0
else:
source, destination_outputs, data, fee_provided = tx_info
if not isinstance(fee_provided, int):
raise exceptions.TransactionError('Fee provided must be in satoshis')
if encoding not in ('pubkeyhash', 'multisig', 'opreturn'):
raise exceptions.TransactionError('Unknown encoding‐scheme.')
# If public key is necessary for construction of (unsigned) transaction,
# either use the public key provided, or derive it from a private key
# retrieved from wallet.
public_key = None
if encoding in ('multisig', 'pubkeyhash'):
# If no public key was provided, derive from private key.
if not public_key_hex:
# Get private key.
if unittest:
private_key_wif = 'cPdUqd5EbBWsjcG9xiL1hz8bEyGFiz4SW99maU9JgpL9TEcxUf3j'
else:
private_key_wif = rpc('dumpprivkey', [source])
# Derive public key.
public_key_hex = private_key_to_public_key(private_key_wif)
pubkeypair = bitcoin_utils.parse_as_public_pair(public_key_hex)
public_key = public_pair_to_sec(pubkeypair, compressed=True)
# Protocol change.
if encoding == 'pubkeyhash' and get_block_count() < 293000 and not config.TESTNET:
raise exceptions.TransactionError('pubkeyhash encoding unsupported before block 293000')
if config.PREFIX == config.UNITTEST_PREFIX: unittest = True
# Validate source and all destination addresses.
destinations = [address for address, value in destination_outputs]
for address in destinations + [source]:
if address:
try:
base58_decode(address, config.ADDRESSVERSION)
except Exception: # TODO
raise exceptions.AddressError('Invalid Bitcoin address:', address)
# Check that the source is in wallet.
if not unittest and encoding in ('multisig') and not public_key:
if not rpc('validateaddress', [source])['ismine']:
raise exceptions.AddressError('Not one of your Bitcoin addresses:', source)
# Check that the destination output isn't a dust output.
# Set null values to dust size.
new_destination_outputs = []
for address, value in destination_outputs:
if encoding == 'multisig':
if value == None: value = config.MULTISIG_DUST_SIZE
if not value >= config.MULTISIG_DUST_SIZE:
raise exceptions.TransactionError('Destination output is below the dust target value.')
else:
if value == None: value = config.REGULAR_DUST_SIZE
if not value >= config.REGULAR_DUST_SIZE:
raise exceptions.TransactionError('Destination output is below the dust target value.')
new_destination_outputs.append((address, value))
destination_outputs = new_destination_outputs
# Divide data into chunks.
if data:
def chunks(l, n):
""" Yield successive n‐sized chunks from l.
"""
for i in range(0, len(l), n): yield l[i:i+n]
if encoding == 'pubkeyhash':
data_array = list(chunks(data + config.PREFIX, 20 - 1)) # Prefix is also a suffix here.
elif encoding == 'multisig':
data_array = list(chunks(data, 33 - 1))
elif encoding == 'opreturn':
data_array = list(chunks(data, 80))
assert len(data_array) == 1 # Only one OP_RETURN output currently supported (messages should all be shorter than 80 bytes, at the moment).
else:
data_array = []
# Calculate total BTC to be sent.
btc_out = 0
if encoding == 'multisig': data_value = config.MULTISIG_DUST_SIZE
elif encoding == 'opreturn': data_value = config.OP_RETURN_VALUE
else: data_value = config.REGULAR_DUST_SIZE # Pay‐to‐PubKeyHash
btc_out = sum([data_value for data_chunk in data_array])
btc_out += sum([value for address, value in destination_outputs])
# Get size of outputs.
if encoding == 'multisig': data_output_size = 81 # 71 for the data
elif encoding == 'opreturn': data_output_size = 90 # 80 for the data
else: data_output_size = 25 + 9 # Pay‐to‐PubKeyHash (25 for the data?)
outputs_size = ((25 + 9) * len(destination_outputs)) + (len(data_array) * data_output_size)
# Get inputs.
unspent = get_unspent_txouts(source, normalize=True, unittest=unittest, allow_unconfirmed_inputs=allow_unconfirmed_inputs)
inputs, btc_in = [], 0
change_quantity = 0
sufficient_funds = False
final_fee = config.FEE_PER_KB
for coin in sorted(unspent,key=lambda x:input_value_weight(x['amount'])):
inputs.append(coin)
btc_in += round(coin['amount'] * config.UNIT)
size = 181 * len(inputs) + outputs_size + 10
necessary_fee = (int(size / 10000) + 1) * config.FEE_PER_KB
final_fee = max(fee_provided, necessary_fee)
change_quantity = btc_in - (btc_out + final_fee)
if change_quantity == 0 or change_quantity >= config.REGULAR_DUST_SIZE: # If change is necessary, must not be a dust output.
sufficient_funds = True
break
if not sufficient_funds:
# Approximate needed change, fee by with most recently calculated quantities.
total_btc_out = btc_out + max(change_quantity, 0) + final_fee
raise exceptions.BalanceError('Insufficient bitcoins at address {}. (Need approximately {} BTC.)'.format(source, total_btc_out / config.UNIT))
# Construct outputs.
if data: data_output = (data_array, data_value)
else: data_output = None
if change_quantity: change_output = (source, change_quantity)
else: change_output = None
# Serialise inputs and outputs.
transaction = serialise(encoding, inputs, destination_outputs, data_output, change_output, source=source, public_key=public_key)
unsigned_tx_hex = binascii.hexlify(transaction).decode('utf-8')
return unsigned_tx_hex
def serialise(inputs,
destination_output=None,
data_output=None,
change_output=None,
source=None,
multisig=False):
s = (1).to_bytes(4, byteorder='little') # Version
# Number of inputs.
s += var_int(int(len(inputs)))
# List of Inputs.
for i in range(len(inputs)):
txin = inputs[i]
s += binascii.unhexlify(bytes(txin['txid'],
'utf-8'))[::-1] # TxOutHash
s += txin['vout'].to_bytes(4, byteorder='little') # TxOutIndex
script = str.encode(txin['scriptPubKey'])
s += var_int(int(len(script))) # Script length
s += script # Script
s += b'\xff' * 4 # Sequence
# Number of outputs.
n = 0
if destination_output: n += 1
if data_output:
data_array, value = data_output
for data_chunk in data_array:
n += 1
else:
data_array = []
if change_output: n += 1
s += var_int(n)
# Destination output.
if destination_output:
address, value = destination_output
pubkeyhash = base58_decode(address, config.ADDRESSVERSION)
s += value.to_bytes(8, byteorder='little') # Value
script = OP_DUP # OP_DUP
script += OP_HASH160 # OP_HASH160
script += op_push(20) # Push 0x14 bytes
script += pubkeyhash # pubKeyHash
script += OP_EQUALVERIFY # OP_EQUALVERIFY
script += OP_CHECKSIG # OP_CHECKSIG
s += var_int(int(len(script))) # Script length
s += script
# Data output.
for data_chunk in data_array:
data_array, value = data_output # DUPE
s += value.to_bytes(8, byteorder='little') # Value
if multisig:
# Get source public key (either provided as a string or derived from a private key in the wallet).
if isinstance(multisig, str):
pubkeypair = bitcoin_utils.parse_as_public_pair(multisig)
source_pubkey = public_pair_to_sec(pubkeypair, compressed=True)
else:
if config.PREFIX == config.UNITTEST_PREFIX:
private_key_wif = 'cPdUqd5EbBWsjcG9xiL1hz8bEyGFiz4SW99maU9JgpL9TEcxUf3j'
else:
private_key_wif = rpc('dumpprivkey', [source])
if private_key_wif[0] == 'c': testnet = True
else: testnet = False
secret_exponent, compressed = wif_to_tuple_of_secret_exponent_compressed(
private_key_wif, is_test=testnet)
public_pair = public_pair_for_secret_exponent(
generator_secp256k1, secret_exponent)
source_pubkey = public_pair_to_sec(public_pair,
compressed=compressed)
# Get data (fake) public key.
pad_length = 33 - 1 - len(data_chunk)
assert pad_length >= 0
data_pubkey = bytes([len(data_chunk)
]) + data_chunk + (pad_length * b'\x00')
script = OP_1 # OP_1
script += op_push(
len(source_pubkey)) # Push bytes of source public key
script += source_pubkey # Source public key
script += op_push(
len(data_pubkey)) # Push bytes of data chunk (fake) public key
script += data_pubkey # Data chunk (fake) public key
script += OP_2 # OP_2
script += OP_CHECKMULTISIG # OP_CHECKMULTISIG
else:
script = OP_RETURN # OP_RETURN
script += op_push(len(
data_chunk)) # Push bytes of data chunk (NOTE: OP_SMALLDATA?)
script += data_chunk # Data chunk
s += var_int(int(len(script))) # Script length
s += script
# Change output.
if change_output:
address, value = change_output
pubkeyhash = base58_decode(address, config.ADDRESSVERSION)
s += value.to_bytes(8, byteorder='little') # Value
script = OP_DUP # OP_DUP
script += OP_HASH160 # OP_HASH160
script += op_push(20) # Push 0x14 bytes
script += pubkeyhash # pubKeyHash
script += OP_EQUALVERIFY # OP_EQUALVERIFY
script += OP_CHECKSIG # OP_CHECKSIG
s += var_int(int(len(script))) # Script length
s += script
s += (0).to_bytes(4, byteorder='little') # LockTime
return s
def serialise (encoding, inputs, destination_outputs, data_output=None, change_output=None, source=None, pubkey=None):
s = (1).to_bytes(4, byteorder='little') # Version
# Number of inputs.
s += var_int(int(len(inputs)))
# List of Inputs.
for i in range(len(inputs)):
txin = inputs[i]
s += binascii.unhexlify(bytes(txin['txid'], 'utf-8'))[::-1] # TxOutHash
s += txin['vout'].to_bytes(4, byteorder='little') # TxOutIndex
script = binascii.unhexlify(bytes(txin['scriptPubKey'], 'utf-8'))
s += var_int(int(len(script))) # Script length
s += script # Script
s += b'\xff' * 4 # Sequence
# Number of outputs.
n = 0
n += len(destination_outputs)
if data_output:
data_array, value = data_output
for data_chunk in data_array: n += 1
else:
data_array = []
if change_output: n += 1
s += var_int(n)
# Destination output.
for address, value in destination_outputs:
pubkeyhash = base58_decode(address, config.ADDRESSVERSION)
s += value.to_bytes(8, byteorder='little') # Value
script = OP_DUP # OP_DUP
script += OP_HASH160 # OP_HASH160
script += op_push(20) # Push 0x14 bytes
script += pubkeyhash # pubKeyHash
script += OP_EQUALVERIFY # OP_EQUALVERIFY
script += OP_CHECKSIG # OP_CHECKSIG
s += var_int(int(len(script))) # Script length
s += script
# Data output.
for data_chunk in data_array:
data_array, value = data_output # DUPE
s += value.to_bytes(8, byteorder='little') # Value
# Get source public key (either provided as a string or derived from a private key in the wallet).
if encoding in ('multisig', 'pubkeyhash'):
if pubkey:
pubkeypair = bitcoin_utils.parse_as_public_pair(pubkey)
source_pubkey = public_pair_to_sec(pubkeypair, compressed=True)
else:
if config.PREFIX == config.UNITTEST_PREFIX:
private_key_wif = 'cPdUqd5EbBWsjcG9xiL1hz8bEyGFiz4SW99maU9JgpL9TEcxUf3j'
else:
private_key_wif = rpc('dumpprivkey', [source])
if private_key_wif[0] == 'c': testnet = True
else: testnet = False
secret_exponent, compressed = wif_to_tuple_of_secret_exponent_compressed(private_key_wif, is_test=testnet)
public_pair = public_pair_for_secret_exponent(generator_secp256k1, secret_exponent)
source_pubkey = public_pair_to_sec(public_pair, compressed=compressed)
if encoding == 'multisig':
# Get data (fake) public key.
pad_length = 33 - 1 - len(data_chunk)
assert pad_length >= 0
data_pubkey = bytes([len(data_chunk)]) + data_chunk + (pad_length * b'\x00')
# Construct script.
script = OP_1 # OP_1
script += op_push(len(source_pubkey)) # Push bytes of source public key
script += source_pubkey # Source public key
script += op_push(len(data_pubkey)) # Push bytes of data chunk (fake) public key
script += data_pubkey # Data chunk (fake) public key
script += OP_2 # OP_2
script += OP_CHECKMULTISIG # OP_CHECKMULTISIG
elif encoding == 'opreturn':
script = OP_RETURN # OP_RETURN
script += op_push(len(data_chunk)) # Push bytes of data chunk (NOTE: OP_SMALLDATA?)
script += data_chunk # Data chunk
elif encoding == 'pubkeyhash':
pad_length = 20 - 1 - len(data_chunk)
assert pad_length >= 0
obj1 = ARC4.new(binascii.unhexlify(inputs[0]['txid'])) # Arbitrary, easy‐to‐find, unique key.
pubkeyhash = bytes([len(data_chunk)]) + data_chunk + (pad_length * b'\x00')
pubkeyhash_encrypted = obj1.encrypt(pubkeyhash)
# Construct script.
script = OP_DUP # OP_DUP
script += OP_HASH160 # OP_HASH160
script += op_push(20) # Push 0x14 bytes
script += pubkeyhash_encrypted # pubKeyHash
script += OP_EQUALVERIFY # OP_EQUALVERIFY
script += OP_CHECKSIG # OP_CHECKSIG
else:
raise exceptions.TransactionError('Unknown encoding‐scheme.')
s += var_int(int(len(script))) # Script length
s += script
# Change output.
if change_output:
address, value = change_output
pubkeyhash = base58_decode(address, config.ADDRESSVERSION)
s += value.to_bytes(8, byteorder='little') # Value
script = OP_DUP # OP_DUP
script += OP_HASH160 # OP_HASH160
script += op_push(20) # Push 0x14 bytes
script += pubkeyhash # pubKeyHash
script += OP_EQUALVERIFY # OP_EQUALVERIFY
script += OP_CHECKSIG # OP_CHECKSIG
s += var_int(int(len(script))) # Script length
s += script
s += (0).to_bytes(4, byteorder='little') # LockTime
return s
def transaction (tx_info, encoding='auto', fee_per_kb=config.DEFAULT_FEE_PER_KB,
regular_dust_size=config.DEFAULT_REGULAR_DUST_SIZE,
multisig_dust_size=config.DEFAULT_MULTISIG_DUST_SIZE,
op_return_value=config.DEFAULT_OP_RETURN_VALUE, exact_fee=None,
fee_provided=0, public_key_hex=None,
allow_unconfirmed_inputs=False, armory=False):
(source, destination_outputs, data) = tx_info
# Data encoding methods.
if data:
if encoding == 'auto':
if len(data) <= 40:
# encoding = 'opreturn'
encoding = 'multisig' # BTCGuild isn’t mining OP_RETURN?!
else:
encoding = 'multisig'
if encoding not in ('pubkeyhash', 'multisig', 'opreturn'):
raise exceptions.TransactionError('Unknown encoding‐scheme.')
if exact_fee and not isinstance(exact_fee, int):
raise exceptions.TransactionError('Exact fees must be in satoshis.')
if not isinstance(fee_provided, int):
raise exceptions.TransactionError('Fee provided must be in satoshis.')
# If public key is necessary for construction of (unsigned) transaction,
# either use the public key provided, or derive it from a private key
# retrieved from wallet.
public_key = None
if encoding in ('multisig', 'pubkeyhash'):
# If no public key was provided, derive from private key.
if not public_key_hex:
# Get private key.
if config.UNITTEST:
private_key_wif = config.UNITTEST_PRIVKEY[source]
else:
private_key_wif = rpc('dumpprivkey', [source])
# Derive public key.
public_key_hex = private_key_to_public_key(private_key_wif)
pubkeypair = bitcoin_utils.parse_as_public_pair(public_key_hex)
if not pubkeypair:
raise exceptions.InputError('Invalid private key.')
public_key = public_pair_to_sec(pubkeypair, compressed=True)
# Protocol change.
if encoding == 'pubkeyhash' and get_block_count() < 293000 and not config.TESTNET:
raise exceptions.TransactionError('pubkeyhash encoding unsupported before block 293000')
# Validate source and all destination addresses.
destinations = [address for address, value in destination_outputs]
for address in destinations + [source]:
if address:
try:
base58_decode(address, config.ADDRESSVERSION)
except Exception: # TODO
raise exceptions.AddressError('Invalid Bitcoin address:', address)
# Check that the source is in wallet.
if not config.UNITTEST and encoding in ('multisig') and not public_key:
if not rpc('validateaddress', [source])['ismine']:
raise exceptions.AddressError('Not one of your Bitcoin addresses:', source)
# Check that the destination output isn't a dust output.
# Set null values to dust size.
new_destination_outputs = []
for address, value in destination_outputs:
if encoding == 'multisig':
if value == None: value = multisig_dust_size
if not value >= multisig_dust_size:
raise exceptions.TransactionError('Destination output is below the dust target value.')
else:
if value == None: value = regular_dust_size
if not value >= regular_dust_size:
raise exceptions.TransactionError('Destination output is below the dust target value.')
new_destination_outputs.append((address, value))
destination_outputs = new_destination_outputs
# Divide data into chunks.
if data:
def chunks(l, n):
""" Yield successive n‐sized chunks from l.
"""
for i in range(0, len(l), n): yield l[i:i+n]
if encoding == 'pubkeyhash':
data_array = list(chunks(data + config.PREFIX, 20 - 1)) # Prefix is also a suffix here.
elif encoding == 'multisig':
data_array = list(chunks(data, 33 - 1))
elif encoding == 'opreturn':
data_array = list(chunks(data, config.OP_RETURN_MAX_SIZE))
assert len(data_array) == 1 # Only one OP_RETURN output currently supported (OP_RETURN messages should all be shorter than 40 bytes, at the moment).
else:
data_array = []
# Calculate total BTC to be sent.
btc_out = 0
if encoding == 'multisig': data_value = multisig_dust_size
elif encoding == 'opreturn': data_value = op_return_value
else: data_value = regular_dust_size # Pay‐to‐PubKeyHash
btc_out = sum([data_value for data_chunk in data_array])
btc_out += sum([value for address, value in destination_outputs])
# Get size of outputs.
if encoding == 'multisig': data_output_size = 81 # 71 for the data
elif encoding == 'opreturn': data_output_size = 90 # 80 for the data
else: data_output_size = 25 + 9 # Pay‐to‐PubKeyHash (25 for the data?)
outputs_size = ((25 + 9) * len(destination_outputs)) + (len(data_array) * data_output_size)
# Get inputs.
unspent = get_unspent_txouts(source, normalize=True)
unspent = sort_unspent_txouts(unspent, allow_unconfirmed_inputs)
logging.debug('Sorted UTXOs: {}'.format([print_coin(coin) for coin in unspent]))
inputs, btc_in = [], 0
change_quantity = 0
sufficient_funds = False
final_fee = fee_per_kb
for coin in unspent:
logging.debug('New input: {}'.format(print_coin(coin)))
inputs.append(coin)
btc_in += round(coin['amount'] * config.UNIT)
# If exact fee is specified, use that. Otherwise, calculate size of tx and base fee on that (plus provide a minimum fee for selling BTC).
if exact_fee:
final_fee = exact_fee
else:
size = 181 * len(inputs) + outputs_size + 10
necessary_fee = (int(size / 1000) + 1) * fee_per_kb
final_fee = max(fee_provided, necessary_fee)
assert final_fee >= 1 * fee_per_kb
# Check if good.
change_quantity = btc_in - (btc_out + final_fee)
logging.debug('Change quantity: {} BTC'.format(change_quantity / config.UNIT))
if change_quantity == 0 or change_quantity >= regular_dust_size: # If change is necessary, must not be a dust output.
sufficient_funds = True
break
if not sufficient_funds:
# Approximate needed change, fee by with most recently calculated quantities.
total_btc_out = btc_out + max(change_quantity, 0) + final_fee
raise exceptions.BalanceError('Insufficient bitcoins at address {}. (Need approximately {} {}.) To spend unconfirmed coins, use the flag `--unconfirmed`.'.format(source, total_btc_out / config.UNIT, config.BTC))
# Construct outputs.
if data: data_output = (data_array, data_value)
else: data_output = None
if change_quantity: change_output = (source, change_quantity)
else: change_output = None
# Serialise inputs and outputs.
unsigned_tx = serialise(encoding, inputs, destination_outputs, data_output, change_output, source=source, public_key=public_key)
unsigned_tx_hex = binascii.hexlify(unsigned_tx).decode('utf-8')
# bip-0010
try:
if armory:
txdp = []
dpid = base58_encode(hashlib.sha256(unsigned_tx).digest())[:8]
txdp.append(('-----BEGIN-TRANSACTION-' + dpid + '-----').ljust(80,'-'))
magic_bytes = binascii.hexlify(config.MAGIC_BYTES).decode('utf-8')
varIntTxSize = binascii.hexlify(len(unsigned_tx).to_bytes(2, byteorder='big')).decode('utf-8')
txdp.append('_TXDIST_{}_{}_{}'.format(magic_bytes, dpid, varIntTxSize))
tx_list = unsigned_tx_hex
for coin in inputs:
tx_list += get_raw_transaction(coin['txid'], json=False)
for byte in range(0,len(tx_list),80):
txdp.append(tx_list[byte:byte+80] )
for index, coin in enumerate(inputs):
index_fill = str(index).zfill(2)
value = '{0:.8f}'.format(coin['amount'])
txdp.append('_TXINPUT_{}_{}'.format(index_fill, value))
txdp.append(('-----END-TRANSACTION-' + dpid + '-----').ljust(80,'-'))
unsigned_tx_hex = '\n'.join(txdp)
except Exception as e:
print(e)
return unsigned_tx_hex
def serialise (inputs, destination_output=None, data_output=None, change_output=None, multisig=False, source=None, unsigned=False):
assert not (multisig and unsigned is True)
s = (1).to_bytes(4, byteorder='little') # Version
# Number of inputs.
s += var_int(int(len(inputs)))
# List of Inputs.
for i in range(len(inputs)):
txin = inputs[i]
s += binascii.unhexlify(bytes(txin['txid'], 'utf-8'))[::-1] # TxOutHash
s += txin['vout'].to_bytes(4, byteorder='little') # TxOutIndex
if not unsigned:
# No signature.
script = b''
else:
#pubkeyhash = base58_decode(source, config.ADDRESSVERSION)
#script = OP_DUP # OP_DUP
#script += OP_HASH160 # OP_HASH160
#script += op_push(20) # Push 0x14 bytes
#script += pubkeyhash # pubKeyHash
#script += OP_EQUALVERIFY # OP_EQUALVERIFY
#script += OP_CHECKSIG # OP_CHECKSIG
script = str.encode(txin['scriptPubKey'])
s += var_int(int(len(script))) # Script length
s += script # Script
s += b'\xff' * 4 # Sequence
# Number of outputs.
n = 0
if destination_output: n += 1
if data_output:
data_array, value = data_output
for data_chunk in data_array: n += 1
else:
data_array = []
if change_output: n += 1
s += var_int(n)
# Destination output.
if destination_output:
address, value = destination_output
pubkeyhash = base58_decode(address, config.ADDRESSVERSION)
s += value.to_bytes(8, byteorder='little') # Value
script = OP_DUP # OP_DUP
script += OP_HASH160 # OP_HASH160
script += op_push(20) # Push 0x14 bytes
script += pubkeyhash # pubKeyHash
script += OP_EQUALVERIFY # OP_EQUALVERIFY
script += OP_CHECKSIG # OP_CHECKSIG
s += var_int(int(len(script))) # Script length
s += script
# Data output.
for data_chunk in data_array:
data_array, value = data_output # DUPE
s += (value).to_bytes(8, byteorder='little') # Value
if multisig:
# Get source public key.
if unsigned:
assert isinstance(unsigned, str)
pubkeypair = bitcoin_utils.parse_as_public_pair(unsigned)
source_pubkey = public_pair_to_sec(pubkeypair, compressed=True)
else:
if config.PREFIX == config.UNITTEST_PREFIX:
private_key_wif = 'cPdUqd5EbBWsjcG9xiL1hz8bEyGFiz4SW99maU9JgpL9TEcxUf3j'
else:
private_key_wif = rpc('dumpprivkey', [source])
if private_key_wif[0] == 'c': testnet = True
else: testnet = False
secret_exponent, compressed = wif_to_tuple_of_secret_exponent_compressed(private_key_wif, is_test=testnet)
public_pair = public_pair_for_secret_exponent(generator_secp256k1, secret_exponent)
source_pubkey = public_pair_to_sec(public_pair, compressed=compressed)
# Get data (fake) public key.
pad_length = 33 - 1 - len(data_chunk)
assert pad_length >= 0
data_pubkey = bytes([len(data_chunk)]) + data_chunk + (pad_length * b'\x00')
script = OP_1 # OP_1
script += op_push(len(source_pubkey)) # Push bytes of source public key
script += source_pubkey # Source public key
script += op_push(len(data_pubkey)) # Push bytes of data chunk (fake) public key
script += data_pubkey # Data chunk (fake) public key
script += OP_2 # OP_2
script += OP_CHECKMULTISIG # OP_CHECKMULTISIG
else:
script = OP_RETURN # OP_RETURN
script += op_push(len(data_chunk)) # Push bytes of data chunk (NOTE: OP_SMALLDATA?)
script += data_chunk # Data chunk
s += var_int(int(len(script))) # Script length
s += script
# Change output.
if change_output:
address, value = change_output
pubkeyhash = base58_decode(address, config.ADDRESSVERSION)
s += value.to_bytes(8, byteorder='little') # Value
script = OP_DUP # OP_DUP
script += OP_HASH160 # OP_HASH160
script += op_push(20) # Push 0x14 bytes
script += pubkeyhash # pubKeyHash
script += OP_EQUALVERIFY # OP_EQUALVERIFY
script += OP_CHECKSIG # OP_CHECKSIG
s += var_int(int(len(script))) # Script length
s += script
s += (0).to_bytes(4, byteorder='little') # LockTime
return s