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import hashlib
import time
class Block:
def __init__(self, index, previous_hash, timestamp, data, hash):
self.index = index
self.previous_hash = previous_hash
self.timestamp = timestamp
self.data = data
self.hash = hash
class Blockchain:
def __init__(self):
self.chain = [self.create_genesis_block()]
def create_genesis_block(self):
genesis_block = Block(0, "0", int(time.time()), "Genesis Block", "0")
genesis_block.hash = self.calculate_hash(genesis_block)
return genesis_block
def calculate_hash(self, block):
block_string = f"{block.index}{block.previous_hash}{block.timestamp}{block.data}".encode()
return hashlib.sha256(block_string).hexdigest()
def get_latest_block(self):
return self.chain[-1]
def add_block(self, data):
latest_block = self.get_latest_block()
new_block = Block(len(self.chain), latest_block.hash, int(time.time()), data, "")
new_block.hash = self.calculate_hash(new_block)
self.chain.append(new_block)
print(f"Block added: {new_block.hash}")
return new_block
def is_chain_valid(self):
for i in range(1, len(self.chain)):
current_block = self.chain[i]
previous_block = self.chain[i - 1]
if current_block.hash != self.calculate_hash(current_block):
return False
if current_block.previous_hash != previous_block.hash:
return False
return True
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