$ビットコイン (BTC.CC)$import hashlib import datetime class ブロック:...

$ビットコイン(BTC.CC)$import hashlib
import datetime

class ブロック:
def __init__(self, index, previous_hash, timestamp, data, nonce=0):
self.index = index
self.previous_hash = previous_hash
self.timestamp = timestamp
self.data = data
      self.nonce = nonce
      self.hash = self.calculate_hash()

    def calculate_hash(self):
        return hashlib.sha256((str(self.index) + self.previous_hash + str(self.timestamp) + self.data + str(self.nonce)).encode()).hexdigest()

class Blockchain:
    def __init__(self):
        self.chain = [self.create_genesis_block()]

    def create_genesis_block(self):
        return ブロック(0, "0", datetime.datetime.now(), "Genesis Block")

    def add_block(self, new_block):
        new_block.previous_hash = self.chain[-1].hash
        new_block.hash = new_block.calculate_hash()
        self.chain.append(new_block)

    def proof_of_work(self, block, difficulty):
        while block.hash[:difficulty] != '0' * difficulty:
            block.nonce += 1
            block.hash = block.calculate_hash()
        print("ブロックがマイニングされました:", block.hash)

# 使用例
difficulty = 4  # ハッシュ出力の先頭に必要なゼロの数
ブロックチェーン = Blockchain()

# 創世ブロックのマイニング
blockchain.proof_of_work(blockchain.chain[0], difficulty)
print("Genesis Block mined")

# 追加のブロックを追加
num_blocks = 3
for i in range(1, num_blocks + 1):
new_block = Block(i, "", datetime.datetime.now(), "Block " + str(i))
blockchain.proof_of_work(new_block, difficulty)
blockchain.add_block(new_block)
print("Block", i, "added to the blockchain")