def create_new_block_and_header():
'''Creates a new block and header with the coinbase transaction included and returns them.'''
block = blockchain.Block()
header = blockchain.Header()
# Create the coinbase Transaction
coinbase_tx = blockchain.Transaction()
coinbase_tx.setVersionNumber(
len(Blockchain)) # Becomes a unique identifier for the transaction
coinbase_tx.setInCounter(1)
coinbase_tx.setOutCounter(1)
coinbase_tx.setListOfInputs([blockchain.compute_double_hash('coinbase')])
coinbase_tx.setListOfOutputs([blockchain.compute_double_hash('minerpay')])
coinbase_tx.setTransactionHash(
blockchain.computeTransactionHash(coinbase_tx))
# Add to block and update header
block.addTransaction(coinbase_tx)
block.setTransactionCounter(block.getTransactionCounter() + 1)
Tree = Merkel_Tree(list(block.getTransactions()[0].getTransactionHash()))
Tree.construct_tree()
header.sethashMerkleRoot(Tree.merkelroot) # Set Merkel Root
header.setTimestamp(int(time.time()))
header.sethashPrevBlock(
Blockchain[-1].getBlockhash()) # Set Previous Block
header.setBits(0x1e200000) # Set the difficulty bits
block.setBlocksize(179)
block.setBlockHeader(header)
block.setBlockhash(blockchain.computeHeaderHash(block.getBlockHeader()))
return block, header
def new_tx_from_data(self, data):
phash = 0
if len(self.unconfirmed_transactions) > 0:
phash = self.unconfirmed_transactions[-1].hash
tx = bl.Transaction(phash, data)
self.unconfirmed_transactions.append(tx)
return tx.serialize()
def generate_genesis_block():
'''Generates the genesis block'''
# Genesis Transaction
genesis_transaction = blockchain.Transaction()
genesis_transaction.setVersionNumber(0)
genesis_transaction.setOutCounter(1)
genesis_transaction.setInCounter(1)
genesis_transaction.setListOfInputs(['genin'])
genesis_transaction.setListOfOutputs(['genesis07'])
genesis_transaction.setTransactionHash(
blockchain.computeTransactionHash(genesis_transaction))
# Genesis Header
genesis_header = blockchain.Header()
genesis_header.sethashPrevBlock('0' * 64) # Previous Hash of all 0's
Tree = Merkel_Tree([genesis_transaction.getTransactionHash()])
Tree.construct_tree()
genesis_header.sethashMerkleRoot(Tree.merkelroot)
# Genesis Block
genesis_block = blockchain.Block()
genesis_block.setBlockHeader(genesis_header)
genesis_block.setTransactionCounter(1)
genesis_block.addTransaction(genesis_transaction)
genesis_block.setBlocksize(179)
genesis_block.setBlockhash(
blockchain.computeHeaderHash(genesis_block.getBlockHeader()))
return genesis_block
def new_transaction():
if request.method == 'POST':
tx_data = request.get_json()
forwarder = tx_data['forwarder']
receiver = tx_data['receiver']
amount = tx_data['amount']
publickey = tx_data['publickey']
signature = tx_data['signature']
hashed = tx_data['hash']
transaction = blockchain.Transaction(forwarder, receiver, amount, publickey)
print("Checking: " + str(transaction.overview()))
if not has_transaction(transaction):
# two step verification
# transaction comes from publickey owner
condition = crypto.verify(publickey, str(transaction), signature)
print ('tx condition: ' + str(condition))
# value can be spend
# TODO get_balance(fingerprint)
if condition:
advertise_transaction(transaction)
add_transaction(transaction)
if not transaction_thread.is_alive():
transaction_thread = threading.Thread(name='transaction', target=process_transaction)
transaction_thread.start()
return 'Transaction registered'
else:
return 'Verification fail, requester is a teapot', 418
else:
return 'Transaction already registered'
def test_tx_hash(self):
inputs = [Bytes(b"one"), Bytes(b"two"), Bytes(b"three")]
outputs = [Bytes(b"abc"), Bytes(b"xyz")]
tx = blockchain.Transaction(inputs=inputs,
outputs=outputs,
hash_f=lambda x: b"(" + x + b")")
assert b"(onetwothreeabcxyz\x00)" == tx.hash
def test_tx_bytes(self):
inputs = [Bytes(b"one"), Bytes(b"two"), Bytes(b"three")]
outputs = [Bytes(b"abc"), Bytes(b"xyz")]
tx = blockchain.Transaction(inputs=inputs,
outputs=outputs,
hash_f=lambda x: x)
assert b"onetwothreeabcxyz\x00" == tx.bytes
def test_tx_hash_with_extra_nonce(self):
inputs = [Bytes(b"one"), Bytes(b"two"), Bytes(b"three")]
outputs = [Bytes(b"abc"), Bytes(b"xyz")]
tx = blockchain.Transaction(inputs=inputs,
outputs=outputs,
hash_f=lambda x: b"(" + x + b")")
tx.extra_nonce = bytes_to_int(bytes("X".encode("utf-8")))
assert b"(onetwothreeabcxyzX)" == tx.hash
def NewTransactionReceived(self, request, context):
global TxnMemoryPool
print("New Transaction Received")
tr = blockchain.Transaction()
tr.setVersionNumber(request.VersionNumber)
tr.setInCounter(request.incounter)
tr.setOutCounter(request.outcounter)
tr.setListOfInputs(request.list_of_inputs)
tr.setListOfOutputs(request.list_of_outputs)
tr.setTransactionHash(request.transaction_hash)
TxnMemoryPool.append(tr) # Add the transaction to memory pool
return response
def transaction_from_serial(serial_data):
'''
Returns a python transaction from received serial data
'''
tx = blockchain.Transaction()
tx.setVersionNumber(serial_data.VersionNumber)
tx.setInCounter(serial_data.incounter)
tx.setOutCounter(serial_data.outcounter)
tx.setListOfInputs(serial_data.list_of_inputs)
tx.setListOfOutputs(serial_data.list_of_outputs)
tx.setTransactionHash(serial_data.transaction_hash)
return tx
def adv_tx(receiver, amount):
global node
global transaction_thread
print(node.overview())
t = blockchain.Transaction(node.fingerprint, receiver, amount, node.publickey)
add_transaction(t)
if not transaction_thread.is_alive():
transaction_thread = threading.Thread(name='transaction', target=process_transaction)
transaction_thread.start()
for fingerprint, address in node.neighbours.items():
a = 'http://' + address + ':5000' + '/tx'
r = requests.post(a, json=t.overview())
def add():
tr = blockchain.Transaction()
tr.setVersionNumber(1)
tr.setInCounter(1)
tr.setOutCounter(1)
random_number = round(random.random(), 2)
inp_value = str(round(time.time())) + str(random_number)
tr.setListOfInputs([blockchain.compute_double_hash(inp_value)])
tr.setListOfOutputs([
blockchain.compute_double_hash(
str(10 * random_number) + 'outputpay')
])
tr.setTransactionHash(blockchain.computeTransactionHash(tr))
TxnMemoryPool.append(tr) # Add the transaction to memory pool
newTransactionBroadcast(tr)
def create_coinbase_transaction(self, dest_key=None):
"""
Creates a coinbase transaction. This transaction is included as the
first transaction of the block and is creating a fixed amount of coins
"""
coinbase_output = blockchain.TransactionOutput(
amount=constants.BLOCK_COINBASE_AMOUNT,
key=dest_key or self._ecdsa.public_key)
coinbase_tx = blockchain.Transaction(
inputs=[],
outputs=[coinbase_output],
)
return coinbase_tx
def new_block():
global lock
lock.acquire()
if request.method == 'POST':
tx_data = request.get_json()
transactions.append(tx_data)
index = tx_data['index']
timestamp = tx_data['timestamp']
previous_hash = tx_data['previous_hash']
hashed = tx_data['hash']
nonce = tx_data['nonce']
miner = tx_data['miner']
forwarder = tx_data['transaction']['forwarder']
receiver = tx_data['transaction']['receiver']
amount = tx_data['transaction']['amount']
publickey = tx_data['transaction']['publickey']
signature = tx_data['transaction']['signature']
hashed = tx_data['transaction']['hash']
transaction = blockchain.Transaction(forwarder, receiver, amount, publickey)
print(blockchain.verify_proof(transaction, nonce, miner))
print(crypto.verify(publickey, str(transaction), signature))
# verify proof of work had place and transaction is from publickey owner
condition = blockchain.verify_proof(transaction, nonce, miner) and \
crypto.verify(publickey, str(transaction), signature)
if condition:
advertise_block(block)
#node.add_transaction(transaction)
add_block(block)
lock.release()
return 'Transaction registered'
else:
return 'Verification fail, requester is a teapot', 418
else:
lock.release()
