python实现区块链代码
如果你明白了原理其实挺简单的。
加密算法是python自带的
需要导入hashlib
import hashlib as hash
sha = hasher.sha256()
sha.update('your content')
print sha.hexdigest()
输出:baca6a6db216faf43b107e5f00e20eaf22edc75e922de5ccc08c16b91b9eb3bd
如果内容变成(索引+时间戳+内容+上次加密的hash内容)这个没有问题吧
然后创建一个类,把这些内容保存起来,放入到列表里。
下面贴出源代码
#!/usr/bin/env python # -*- coding:utf-8 -*- import hashlib as hasher import datetime as date 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.hash_block() def hash_block(self): sha = hasher.sha256() sha.update(str(self.index) + str(self.timestamp) + str(self.data) + str(self.previous_hash)) return sha.hexdigest() def create_genesis_block(): return Block(0, date.datetime.now(), "Block Data", "0") def next_block(last_block): this_index = last_block.index + 1 this_timestamp = date.datetime.now() this_data = "Hey! I'm block " + str(this_index) this_hash = last_block.hash return Block(this_index, this_timestamp, this_data, this_hash) blockchain = [create_genesis_block()] previous_block = blockchain[0] #生成20个为例 num_of_blocks_to_add = 20 for i in range(0, num_of_blocks_to_add): block_to_add = next_block(previous_block) blockchain.append(block_to_add) previous_block = block_to_add # Tell everyone about it! print "Block #{} has been added to the blockchain!".format(block_to_add.index) print "Hash: {}\n".format(block_to_add.hash)
结果:
Block #1 has been added to the blockchain!
Hash: b871f17f63685be10f35820bb380f53aabc2ffeed683a7d6de9787194391b1a0
Block #2 has been added to the blockchain!
Hash: df74f5d23e0772a281a0ffbc0802e4f84abcefc6be59d8af0813413d322b8e68
Block #3 has been added to the blockchain!
Hash: e9cad108bbd80eafa33d61e9cd10a37f9c5ccacac6b1293a9e0b0d3648d1d343
Block #4 has been added to the blockchain!
Hash: 10ad66a24dfa08d52034f3c366d49634cc9b1e3e614d13de9be41eed550838e6
Block #5 has been added to the blockchain!
Hash: 7d96771e2c1ef0721aca7ceb1a599550bc33d07020c419e4c1513e4f8d420a13
Block #6 has been added to the blockchain!
Hash: 08f7e29c8c9641705caa15deab28db75dd5dd66d8d98b7eb5187f40ce31dee65
Block #7 has been added to the blockchain!
Hash: e624c681afc1f6f2e785b89275bce8f5c1ac3e5b94c34ac7a0363dbdc76da41a
Block #8 has been added to the blockchain!
Hash: 6d3129403393864ec54df6e94ddfe72d6efed98383c362eedf51a0548f0f9d74
Block #9 has been added to the blockchain!
Hash: 141202a42c71ff911a829df5685737eba74d008304113381fe1fca6b3d9217be
Block #10 has been added to the blockchain!
Hash: b45029d2a40f5d691d2ce871bb7ac7d4aabab8a766349a9996c9cec07a7f2450
Block #11 has been added to the blockchain!
Hash: e24c5eefb57fe754a8f75b4b17c7d17e3fdcb8efb0713ba8ec57270d4321b139
Block #12 has been added to the blockchain!
Hash: df445b248db7b0540fbae61773a925323cccb072126a126aaf178800eca1d683
Block #13 has been added to the blockchain!
Hash: 0ffa6e5b54d2bc738afe636fd253f4afd7b13995f59ac43b992d10944f0da934
Block #14 has been added to the blockchain!
Hash: 4d45a38b7b10267c195efe8371b26e825018c32db5e2d24f174388798fedf35f
Block #15 has been added to the blockchain!
Hash: 7caae5e46a187481534f870a2fb39f6f1169162db9264273b4376665925d4d7f
Block #16 has been added to the blockchain!
Hash: 54770c9fff28e34218663812cf3234cb390715cbc24b85df236d2bb0e1e88cd5
Block #17 has been added to the blockchain!
Hash: 8a3ae9c8599c6663e6171ebca9ec6a94a1629d73a2ef91ead27447327bc741b8
Block #18 has been added to the blockchain!
Hash: 09f6c1e7b4b7a5ffee15929605c365054671447a84cbf2a0e326d43004c74ad4
Block #19 has been added to the blockchain!
Hash: 64d38c2df1190b24f68127c9d6158e1aa23c6edec0baf3280245befbbc104e7c
Block #20 has been added to the blockchain!
Hash: 4387beb245f1bb48938da280416ab5c21f17623377dd67915d6441ea47385899