donkequan / blockchain_simple_implementation

A simple implementation for developing a blockchain application with mining in Python.

blockchain simple implementation in Python

A simple implementation for developing a blockchain application with mining in Python.

项目是一个区块链的简单实现，是支持数据上传，挖矿和共识。

为了简化，没有加入签名认证，并且实验时一次只能有一个节点挖矿。

必要环境

• python3

基于Flask框架和requests请求

pip3 install -r requirements.txt

功能实现和测试：

1. 交易上传

   python flask_server.py -p 8080
   python client.py -p 8080 -a hdk -d hhhhhh
   

   访问：

   localhost:8080/pending_tx
   

   输出：

   [{"author": "hdk", "content": "hhhhhh", "timestamp": 1674557970.5027435}]

2. 挖块

   访问：
   localhost:8080/generate_block
   localhost:8080/chain
   

   输出链结构：

   {"length": 2, "chain": [{"index": 0, "transactions": [], "timestamp": 1674557968.4578717, "previous_hash": "0", "nonce": 0, "hash": "1857515eb50c52193140126226825e0a8203488afa70b2b21a407cb45c0e4173"}, {"index": 1, "transactions": [{"author": "hdk", "content": "hhhhhh", "timestamp": 1674557970.5027435}], "timestamp": 1674558249.506999, "previous_hash": "1857515eb50c52193140126226825e0a8203488afa70b2b21a407cb45c0e4173", "nonce": 761, "hash": "00006de85025cab6ee8bc33dc34c7dad21489c8c1363836113766e6eb1226d07"}]}

3. 节点加入

   python .\flask_server.py -p 8081

   端口8081加入8080的网络

   localhost:8081/join/localhost/8080

   查看8080端口加入的节点：

   浏览器访问：localhost:8080/peers
   [{'ip': 'localhost', 'port': 8081}]

   查看8081端口加入的节点

   浏览器访问：localhost:8080/peers
   返回：[{'ip': 'localhost', 'port': 8081}]

   查看8080端口块数据

   浏览器访问：localhost:8080/chain
   返回：{"length": 2, "chain": [{"index": 0, "transactions": [], "timestamp": 1674557968.4578717, "previous_hash": "0", "nonce": 0, "hash": "1857515eb50c52193140126226825e0a8203488afa70b2b21a407cb45c0e4173"}, {"index": 1, "transactions": [{"author": "hdk", "content": "hhhhhh", "timestamp": 1674557970.5027435}], "timestamp": 1674558249.506999, "previous_hash": "1857515eb50c52193140126226825e0a8203488afa70b2b21a407cb45c0e4173", "nonce": 761, "hash": "00006de85025cab6ee8bc33dc34c7dad21489c8c1363836113766e6eb1226d07"}]}

   查看8081端口块数据

   浏览器访问：localhost:8081/chain
   返回：{"length": 2, "chain": [{"index": 0, "transactions": [], "timestamp": 1674557968.4578717, "previous_hash": "0", "nonce": 0, "hash": "1857515eb50c52193140126226825e0a8203488afa70b2b21a407cb45c0e4173"}, {"index": 1, "transactions": [{"author": "hdk", "content": "hhhhhh", "timestamp": 1674557970.5027435}], "timestamp": 1674558249.506999, "previous_hash": "1857515eb50c52193140126226825e0a8203488afa70b2b21a407cb45c0e4173", "nonce": 761, "hash": "00006de85025cab6ee8bc33dc34c7dad21489c8c1363836113766e6eb1226d07"}]}

​ 块数据一致

Ref：

• https://github.com/OpensourceBooks/blockchain

• https://github.com/satwikkansal/python_blockchain_app/tree/ibm_blockchain_post