python简单区块链模拟详解

class DaDaBlockCoin:

 #index 索引，timestamp 时间戳，data 交易记录，self_hash交易hash,last_hash,上个hash
 def __init__(self,idex,timestamp,data,last_hash):
  self.idex = idex
  self.timestamp = timestamp
  self.data = data
  self.last_hash = last_hash
  self.self_hash=self.hash_DaDaBlockCoin()


 def hash_DaDaBlockCoin(self):
  sha = hashlib.md5()#加密算法,这里可以选择sha256,sha512,为了打印方便，所以选了md5
  #对数据整体加密
  datastr = str(self.idex)+str(self.timestamp)+str(self.data)+str(self.last_hash)
  sha.update(datastr.encode("utf-8"))
  return sha.hexdigest()

def create_first_DaDaBlock(): # 创世区块

 return DaDaBlockCoin(0, datetime.datetime.now(), "love dadacoin", "0")

# last_block,上一个区块
def create_money_DadaBlock(last_block): # 其它块
 this_idex = last_block.idex + 1 # 索引加1
 this_timestamp = datetime.datetime.now()
 this_data = "love dada" + str(this_idex) # 模拟交易数据
 this_hash = last_block.self_hash # 取得上一块的hash
 return DaDaBlockCoin(this_idex, this_timestamp, this_data, this_hash)

DaDaBlockCoins = [create_first_DaDaBlock()] # 区块链列表，只有一个创世区块
nums = 10
head_block = DaDaBlockCoins[0]
print(head_block.idex, head_block.timestamp, head_block.self_hash, head_block.last_hash)
for i in range(nums):
 dadaBlock_add = create_money_DadaBlock(head_block) # 创建一个区块链的节点
 DaDaBlockCoins.append(dadaBlock_add)
 head_block = dadaBlock_add
 print(dadaBlock_add.idex, dadaBlock_add.timestamp, dadaBlock_add.self_hash, dadaBlock_add.last_hash)