def mine_block(self, wallet: BitcoinAccount) -> Optional[Block]:
if not self.tx_pool:
return None
if self.head.hashval == None:
raise Exception("hashval of blockchain head is None.")
new_block = Block(
index=self.head.index + 1,
timestamp=time.time(),
previous_hash=self.head.hashval,
miner=wallet.to_address(),
)
reward = Transaction(
receiver=wallet.to_address(),
sender="NETWORK_ADMIN",
amount=self.block_reward,
timestamp=time.time(),
signature="NETWORK_ADMIN",
)
self.tx_pool.append(reward)
new_block.add_transactions(self.tx_pool)
new_block.mine(self.difficulty)
result = self.__add_block(new_block)
result.sign(wallet)
self.tx_pool.clear()
return result
def mine(self, difficulty, wallet: BitcoinAccount) -> int:
self.timestamp = time.time()
nonce = 0
prefix = '0' * difficulty
hash_val = self.hashBlock(nonce)
while not hash_val.startswith(prefix):
nonce += 1
hash_val = self.hashBlock(nonce)
self.hash_val = hash_val
self.nonce = nonce
if wallet:
self.miner_name = wallet.to_address()
self.sign(wallet)
else:
self.miner_name = "name"
return nonce
import json
import time
from transaction import Transaction
from block import Block
from key import BitcoinAccount
wallet = BitcoinAccount()
difficulty = 4
first_block = Block(0, "")
first_block.add_transaction(sender=wallet.to_address(),
receiver="justine",
amount=50)
first_block.transactions[-1].sign(wallet)
print(first_block.transactions[-1].verify_signature())
first_block.mine(difficulty, wallet)
print(first_block.verify_signature())
last_hash = first_block.hash_val
from chain import Blockchain
from key import BitcoinAccount
wallet = BitcoinAccount()
address = wallet.to_address()
difficulty = 4
blockchain = Blockchain(difficulty)
blockchain.create_genesis_block()
print("blockchain: ")
print(blockchain.to_dict())
first_block = blockchain.blocks_list[-1]
print("First block: ")
print(first_block)
blockchain.add_transaction(address, "colas", 10)
blockchain.add_transaction(address, "salim", 30)
blockchain.mine_block()
print("blockchain: ")
print(blockchain.to_dict())
second_block = blockchain.blocks_list[-1]
print("Second block: ")
print(second_block)
def create(cls, difficulty: int, wallet: BitcoinAccount):
blockchain = cls(difficulty)
blockchain.head.sign(wallet)
blockchain.head.miner = wallet.to_address()
return blockchain
def sign(self, wallet: BitcoinAccount):
message = str(self.sender) + str(self.receiver) + str(self.amount)
if wallet:
self.signature = wallet.sign(message).hex()
port_bind = sys.argv[1]
context = zmq.Context()
socket = context.socket(zmq.PUB)
socket.bind("tcp://*:%s" % port_bind)
topic = ""
ip = "localhost" + ":" + port_bind
socket_sub = context.socket(zmq.SUB)
socket_sub.setsockopt_string(zmq.SUBSCRIBE, topic)
# wallet generation
wallet = BitcoinAccount()
address = wallet.to_address()
file_name = "wallets/" + address + ".json"
wallet.to_file(file_name)
# blockchain data
difficulty = 3
blockchain = None
class Connection(QObject):
chain = Signal(Blockchain)
clean_tx = Signal()
add_tx = Signal(dict)
import time
from transaction import Transaction
from block import Block
from key import BitcoinAccount
wallet = BitcoinAccount()
difficulty = 4
first_block = Block(0, "")
tx = Transaction("mohamed", "justine", 50, time.time())
first_block.add_transaction(tx)
first_block.mine(difficulty)
print("First block is: ")
print(first_block)
last_hash = first_block.hashval
second_block = Block(1, last_hash)
second_block.mine(difficulty)
print("Second block is: ")
print(second_block)
def sign(self, wallet: BitcoinAccount):
message = str(self.hash_val)
self.signature = wallet.sign(message).hex()