import hashlib import numpy as np import random class Block: def init(self, index, timestamp, data, previous_hash): self.index = index self.timestamp = timestamp self.data = data self.previous_hash = previous_hash self.hash = self.calculate_hash() def calculate_hash(self): block_string = json.dumps(self.__dict__, sort_keys=True) return hashlib.sha256(block_string.encode()).hexdigest() class Blockchain: def init(self): self.chain = [] def add_block(self, data): index = len(self.chain) + 1 timestamp = time.time() if index > 1: previous_hash = self.chain[-1].hash else: previous_hash = "0" * 64 block = Block(index, timestamp, data, previous_hash) self.chain.append(block) def validate_chain(self): for i in range(1, len(self.chain)): current_block = self.chain[i] previous_block = self.chain[i-1] if current_block.previous_hash != previous_block.hash: return False if current_block.hash != current_block.calculate_hash(): return False return True class Node: def init(self, id, blockchain): self.id = id self.blockchain = blockchain self.connections = [] def connect_to_node(

class Node: def init(self, id, blockchain): self.id = id self.blockchain = blockchain self.connections = [] def connect_to_node(self, node): self.connections.append(node) def broadcast(self, message): for node in self.connections: node.receive(message) def receive(self, message): # Process the received message pass

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