def _create_transaction_to_miner(cls):
transaction_inputs = list(map(
lambda tx_o: tx_o.to_input(''), TransactionOutput.list_unspent(COINBASE_ADDRESS)
))
transaction_input_amounts = list(map(lambda tx_i: tx_i.transaction_output.amount, transaction_inputs))
if len(transaction_inputs) == 0:
transaction_input_amount_sum = Decimal(0)
else:
transaction_input_amount_sum = Decimal(reduce((lambda x, y: x + y), transaction_input_amounts))
transaction = Transaction.build(
block_id = None,
locktime = 0,
timestamp = datetime.now().timestamp()
)
transaction_output_to_miner = TransactionOutput.build(
transaction_id = transaction.transaction_id,
amount = transaction_input_amount_sum * Decimal(0.99),
sender_address = COINBASE_ADDRESS,
recipient_address = cls.MINER_ADDRESS,
timestamp = datetime.now().timestamp()
)
transaction_output_to_coinbase = TransactionOutput.build(
transaction_id = transaction.transaction_id,
amount = transaction_input_amount_sum * Decimal(0.99),
sender_address = COINBASE_ADDRESS,
recipient_address = COINBASE_ADDRESS,
timestamp = datetime.now().timestamp()
)
transaction.transaction_inputs = transaction_inputs
transaction.transaction_outputs = [transaction_output_to_miner, transaction_output_to_coinbase]
UnconfirmedTransactionPool.transactions.append(transaction)
return transaction
def seed(cls):
timestamp = 0
block = Block.build(block_number=1,
version='1',
previous_block_hash='1',
timestamp=1,
merkle_root='',
difficulty_target=10,
nonce=1)
transaction = Transaction.build(block_id='1',
locktime=0,
timestamp=timestamp)
transaction_output = TransactionOutput.build(
transaction_id='1',
amount=10000000000000000000,
sender_address='coinbase',
recipient_address=
'-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAznjoHvzCJtQcIYd3yj7v\ngwaPlyiG6U/Qlw1G89n0bNt5anvRe+e2eKzvpy98aj6ShGu7hARE9SxAFA9bIHCB\nqdAyPnrUaw7qGkeZNPHBByHe9prJSn0ZwBtfySOSbzdetO5aAwvLj5qMudW2PDz1\n5mP2taGOvXqNnbcH78ZHQLvF6G+SbwuLHU5LEDSZlcy+CnvPqD67cg+QmJLneVmQ\nfOBtbFHz3yDQghNrHWa+UCspUMHVGsDG6OEK7MSpPieY6TzBEYQWsikosQ+V0zBN\nrSCADe3GBcJ7XzafM/gb+gzJ1eP78F1sA6Ja4ZtqInqN406PwerAXaUJa2twW652\n9wIDAQAB\n-----END PUBLIC KEY-----',
timestamp=timestamp)
db.session.add(block)
db.session.add(transaction)
db.session.add(transaction_output)
db.session.commit()
def create_transaction(cls, request):
transaction_input_dicts = request['transaction_inputs']
sender_address = request['sender_address']
recipient_address = request['recipient_address']
request_amount = request['amount']
timestamp = request['timestamp']
unspent_transaction_outputs = list(
filter(
lambda tx_output: tx_output['tx_o'] is not None,
list(
map(
lambda tx_input: {
'tx_o':
TransactionOutput.find_unspent(tx_input[
'transaction_output_id']),
'unlocking_script':
tx_input['unlocking_script']
}, transaction_input_dicts))))
transaction_inputs = list(
map(
lambda tx_output: tx_output['tx_o'].to_input(tx_output[
'unlocking_script']), unspent_transaction_outputs))
verify_results = list(
map(lambda input: input.verify(sender_address),
transaction_inputs))
if False in verify_results:
raise Exception('error.cant_verify_input')
if len(transaction_inputs) == 0:
raise Exception('error.not_enough_input_amount')
transaction_input_amounts = list(
map(lambda input: input.transaction_output.amount,
transaction_inputs))
transaction_input_amount_sum = reduce((lambda x, y: x + y),
transaction_input_amounts)
if request_amount > transaction_input_amount_sum:
raise Exception('error.not_enough_input_amount')
to_sender_amount = request_amount * 0.99
transaction = Transaction.build(block_id=None,
locktime=0,
timestamp=timestamp)
to_sender_transaction_output = TransactionOutput.build(
transaction_id=transaction.transaction_id,
amount=to_sender_amount,
sender_address=sender_address,
recipient_address=recipient_address,
timestamp=timestamp)
to_coinbase_amount = TransactionOutput.build(
transaction_id=transaction.transaction_id,
amount=request_amount - to_sender_amount,
sender_address=sender_address,
recipient_address=COINBASE_ADDRESS,
timestamp=timestamp)
to_recipient_amount = TransactionOutput.build(
transaction_id=transaction.transaction_id,
amount=transaction_input_amount_sum - request_amount,
sender_address=sender_address,
recipient_address=sender_address,
timestamp=timestamp)
transaction_outputs = [
to_sender_transaction_output, to_coinbase_amount,
to_recipient_amount
]
transaction.transaction_outputs = transaction_outputs
transaction.transaction_inputs = transaction_inputs
UnconfirmedTransactionPool.transactions.append(transaction)
return transaction
class Blockchain:
blocks = [
Block.build(
block_number=1,
previous_block_hash="1",
timestamp=0,
merkle_root="",
difficulty_target=20,
nonce=0,
transactions=[
Transaction.build(
timestamp=1,
tx_inputs=[],
tx_outputs=[
TransactionOutput.build(
amount=1000000000,
sender_address=COINBASE_ADDRESS,
recipient_address=
"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAznjoHvzCJtQcIYd3yj7vgwaPlyiG6U/Qlw1G89n0bNt5anvRe+e2eKzvpy98aj6ShGu7hARE9SxAFA9bIHCBqdAyPnrUaw7qGkeZNPHBByHe9prJSn0ZwBtfySOSbzdetO5aAwvLj5qMudW2PDz15mP2taGOvXqNnbcH78ZHQLvF6G+SbwuLHU5LEDSZlcy+CnvPqD67cg+QmJLneVmQfOBtbFHz3yDQghNrHWa+UCspUMHVGsDG6OEK7MSpPieY6TzBEYQWsikosQ+V0zBNrSCADe3GBcJ7XzafM/gb+gzJ1eP78F1sA6Ja4ZtqInqN406PwerAXaUJa2twW6529wIDAQAB",
timestamp=1)
]),
Transaction.build(
timestamp=1,
tx_inputs=[],
tx_outputs=[
TransactionOutput.build(
amount=200000000,
sender_address=COINBASE_ADDRESS,
recipient_address=
"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAznjoHvzCJtQcIYd3yj7vgwaPlyiG6U/Qlw1G89n0bNt5anvRe+e2eKzvpy98aj6ShGu7hARE9SxAFA9bIHCBqdAyPnrUaw7qGkeZNPHBByHe9prJSn0ZwBtfySOSbzdetO5aAwvLj5qMudW2PDz15mP2taGOvXqNnbcH78ZHQLvF6G+SbwuLHU5LEDSZlcy+CnvPqD67cg+QmJLneVmQfOBtbFHz3yDQghNrHWa+UCspUMHVGsDG6OEK7MSpPieY6TzBEYQWsikosQ+V0zBNrSCADe3GBcJ7XzafM/gb+gzJ1eP78F1sA6Ja4ZtqInqN406PwerAXaUJa2twW6529wIDAQAB",
timestamp=1)
]),
Transaction.build(
timestamp=1,
tx_inputs=[],
tx_outputs=[
TransactionOutput.build(
amount=300003,
sender_address=COINBASE_ADDRESS,
recipient_address=
"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAznjoHvzCJtQcIYd3yj7vgwaPlyiG6U/Qlw1G89n0bNt5anvRe+e2eKzvpy98aj6ShGu7hARE9SxAFA9bIHCBqdAyPnrUaw7qGkeZNPHBByHe9prJSn0ZwBtfySOSbzdetO5aAwvLj5qMudW2PDz15mP2taGOvXqNnbcH78ZHQLvF6G+SbwuLHU5LEDSZlcy+CnvPqD67cg+QmJLneVmQfOBtbFHz3yDQghNrHWa+UCspUMHVGsDG6OEK7MSpPieY6TzBEYQWsikosQ+V0zBNrSCADe3GBcJ7XzafM/gb+gzJ1eP78F1sA6Ja4ZtqInqN406PwerAXaUJa2twW6529wIDAQAB",
timestamp=1)
]),
])
]
@classmethod
def fetch_all_blocks(cls):
return cls.blocks
@classmethod
def fetch_block_count(cls):
return len(cls.blocks)
@classmethod
def fetch_last_block(cls):
return cls.blocks[-1]
@classmethod
def fetch_unspent_tx_outputs_by_tx_output_ids(cls, tx_output_ids):
blocks = cls.blocks
if len(blocks) == 0:
return []
transactions = reduce(
add, list(map(lambda block: block.transactions, blocks)))
if len(transactions) == 0:
return []
tx_outputs = reduce(add,
list(map(lambda tx: tx.tx_outputs, transactions)))
tx_inputs = reduce(add, list(map(lambda tx: tx.tx_inputs,
transactions)))
spent_tx_output_ids = list(
map(lambda tx_i: tx_i.transaction_output_id, tx_inputs))
unspent_tx_outputs = list(
filter(
lambda tx_o: tx_o.transaction_output_id not in
spent_tx_output_ids, tx_outputs))
return list(
filter(lambda tx_o: tx_o.transaction_output_id in tx_output_ids,
unspent_tx_outputs))
@classmethod
def fetch_unspent_tx_outputs_by_address(cls, address):
blocks = cls.blocks
if len(blocks) == 0:
return []
transactions = reduce(
add, list(map(lambda block: block.transactions, blocks)))
if len(transactions) == 0:
return []
tx_outputs = reduce(add,
list(map(lambda tx: tx.tx_outputs, transactions)))
tx_inputs = reduce(add, list(map(lambda tx: tx.tx_inputs,
transactions)))
spent_tx_output_ids = list(
map(lambda tx_i: tx_i.transaction_output_id, tx_inputs))
return list(
filter(
lambda tx_o: tx_o.recipient_address == address and tx_o.
transaction_output_id not in spent_tx_output_ids, tx_outputs))
@classmethod
def create_block(cls, block):
cls.blocks.append(block)
@classmethod
def search_new_transactions(cls, transactions):
transactions_in_chain = reduce(
add, list(map(lambda block: block.transactions, cls.blocks)))
return list(
filter(lambda tx: tx not in transactions_in_chain, transactions))
@classmethod
def delete_block(cls, deleting_block):
cls.blocks.remove(deleting_block)
@classmethod
def find_block(cls, block_id):
blocks = list(
filter(lambda block: block.block_id == block_id, cls.blocks))
if len(blocks) == 0:
return None
return blocks[0]