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 = date self.previous_hash = precedent_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. lanț = [] def add_block(self, data): index = len(self.chain) + 1 timestamp = time.time() dacă 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 dacă current_block.hash != current_block.calculate_hash(): return False return True class Nod: def init(self, id , blockchain): self.id = id self.blockchain = blockchain self.connections = [] def connect_to_node(


clasa Nod: 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, mesaj): pentru nodul din self.connections: node.receive(mesaj) def receive(self, message): # Procesează trecerea mesajului primit

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