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Friday, April 26, 2024
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HERE I AM WITH YOU, FOR YOU ALWAYS
BLOCK CHAIN
import hashlib
import time
class Block:
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):
block_string = f"{self.index}{self.previous_hash}{self.timestamp}{self.data}{self.nonce}"
return hashlib.sha256(block_string.encode()).hexdigest()
def mine_block(self, difficulty):
target = '0' * difficulty
while self.hash[:difficulty] != target:
self.nonce += 1
self.hash = self.calculate_hash()
print(f"Block mined: {self.hash}")
class Blockchain:
def __init__(self, difficulty=4):
self.chain = [self.create_genesis_block()]
self.difficulty = difficulty
def create_genesis_block(self):
return Block(0, "0", time.time(), "Genesis Block")
def get_latest_block(self):
return self.chain[-1]
def add_block(self, new_block):
new_block.previous_hash = self.get_latest_block().hash
new_block.mine_block(self.difficulty)
self.chain.append(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 != current_block.calculate_hash():
print("Current block hash is invalid!")
return False
if current_block.previous_hash != previous_block.hash:
print("Previous block hash is invalid!")
return False
return True
# Example usage
blockchain = Blockchain()
print("Mining block 1...")
blockchain.add_block(Block(1, "", time.time(), "Block 1 Data"))
print("Mining block 2...")
blockchain.add_block(Block(2, "", time.time(), "Block 2 Data"))
print("Mining block 3...")
blockchain.add_block(Block(3, "", time.time(), "Block 3 Data"))
# Print the blockchain
for block in blockchain.chain:
print(f"Block {block.index} [Hash: {block.hash}, Previous Hash: {block.previous_hash}, Data: {block.data}]")
# Check if the blockchain is valid
print("Is blockchain valid?", blockchain.is_chain_valid())
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