shengxinjing / Iblockchain
Licence: mit
Learn blockchain by building one in node.js
Stars: ✭ 79
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javascript
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功能
- 学习区块链的演示demo
- 简单的挖矿、交易、P2P网络的实现
- 一系列demo演示命令，辅助理解blockchain
安装
npm install -g iblockchain
上手
执行iblockchain 后 进入demo页面
Welcome to iblockchain !
Commands:
help [command...] Provides help for a given command.
exit Exits application.
mine 开始挖矿
blockchain 查看整个区块链 [bc]
pending 查看还没有打包进区块的交易
trans <to> <amount> 给人转账
blance [address] 查看地址的余额
pub 本地公钥(公钥就是地址)
prv 本地私钥
detail <index> 查看第n个区块的详情
peer 查看P2P网络节点
--------我是分割线--------
hash <value> [演示] 计算sha256哈希
minedemo <data> <difficulty> [演示] 挖矿计算逻辑
getpub <value> [演示] 根据私钥计算出公钥(私钥加密 公钥解密，公钥可以从私钥计算出来)
sign <value> <prv> [演示] 用私钥加密信息 得到签名
verify <value> <pub> <sig> [演示] 使用签名 校验信息 <消息> <公钥> <签名>
valid [演示] 区块链是否合法
update <index> [演示] 篡改<index>个block的数据,第一个转账信息amount+1
mineblock <index> [演示] 对<index>个上的区块数据重新挖矿,使其变成合法的小块块
iblockchain => [信息]: UDP服务监听完毕: 0.0.0.0:51881
[信息]: 更新本地区块链
iblockchain =>
// 继续输入命令 体验功能
体验一下下
查看整个区块链数据
iblockchain => blockchain
// output
┌────────────────────┬────────────────────┬────────────────────┬────────────────────┬────────────────────┬────────────────────┐
│ index │ previousHash │ timestamp │ data │ hash │ nonce │
├────────────────────┼────────────────────┼────────────────────┼────────────────────┼────────────────────┼────────────────────┤
│ 0 │ "0" │ 1538669227813 │ "Welcome to ibloc… │ "00000aa1fbf27775… │ 979911 │
├────────────────────┼────────────────────┼────────────────────┼────────────────────┼────────────────────┼────────────────────┤
│ 1 │ "00000aa1fbf27775… │ 1538988895613 │ [ │ "0000050c2b1b65a0… │ 69438 │
│ │ │ │ { │ │ │
│ │ │ │ "from": "0", │ │ │
│ │ │ │ "to": "0414b351… │ │ │
│ │ │ │ "amount": 100, │ │ │
│ │ │ │ "sig": "3046022… │ │ │
│ │ │ │ "timestamp": 15… │ │ │
│ │ │ │ } │ │ │
│ │ │ │ ] │ │ │
├────────────────────┼────────────────────┼────────────────────┼────────────────────┼────────────────────┼────────────────────┤
│ 2 │ "0000050c2b1b65a0… │ 1538988929584 │ [ │ "000001ee70cd40e8… │ 766700 │
│ │ │ │ { │ │ │
│ │ │ │ "from": "0", │ │ │
│ │ │ │ "to": "0429b0e2… │ │ │
│ │ │ │ "amount": 100, │ │ │
│ │ │ │ "sig": "3044022… │ │ │
│ │ │ │ "timestamp": 15… │ │ │
│ │ │ │ } │ │ │
│ │ │ │ ] │ │ │
└────────────────────┴────────────────────┴────────────────────┴────────────────────┴────────────────────┴────────────────────┘
挖矿,新增区块 mine
iblockchain => mine
// output
[信息]: 挖矿结束 用时4.30s , 算了806180次, 哈希值是00000c3633bd15a4b2c45bbc9373658694b55c078de4777bec28e10cea9e53fd，入账100 请笑纳
┌────────────────────┬────────────────────┬────────────────────┬────────────────────┬────────────────────┬────────────────────┐
│ index │ previousHash │ timestamp │ nonce │ hash │ data │
├────────────────────┼────────────────────┼────────────────────┼────────────────────┼────────────────────┼────────────────────┤
│ 14 │ "00000b93ccf0c0b6… │ 1539017632369 │ 806180 │ "00000c3633bd15a4… │ [ │
│ │ │ │ │ │ { │
│ │ │ │ │ │ "from": "0", │
│ │ │ │ │ │ "to": "041ad79c… │
│ │ │ │ │ │ "amount": 100, │
│ │ │ │ │ │ "sig": "3045022… │
│ │ │ │ │ │ "timestamp": 15… │
│ │ │ │ │ │ } │
│ │ │ │ │ │ ] │
└────────────────────┴────────────────────┴────────────────────┴────────────────────┴────────────────────┴────────────────────┘
查看本地地址（公钥） pub
iblockchain => pub
//output
041ad79cddfcc575efdae26e46e14a13c600967aff1db6d7eba66f770d585c542dfaed897f72b5bc40595f5601a868837f63bface539350ac6d013b99d17a0fbeb
转账 trans
iblockchain => trans 0446b3de736bca3db5e19a7db06e56851a0a45fd07bbf74a355ef91f480151ff9ee7720367b4010c525bada702df62c98768d6a34bdd066e69653ad92e8f99f065 20
//output
┌────────────────────┬────────────────────┬────────────────────┬────────────────────┬────────────────────┐
│ from │ to │ amount │ sig │ timestamp │
├────────────────────┼────────────────────┼────────────────────┼────────────────────┼────────────────────┤
│ "041ad79cddfcc575… │ "0446b3de736bca3d… │ 20 │ "3045022100804809… │ 1539017836747 │
└────────────────────┴────────────────────┴────────────────────┴────────────────────┴────────────────────┘
查看还没打包的交易 pending
iblockchain => pending
//output
┌────────────────────┬────────────────────┬────────────────────┬────────────────────┬────────────────────┐
│ from │ to │ amount │ sig │ timestamp │
├────────────────────┼────────────────────┼────────────────────┼────────────────────┼────────────────────┤
│ "041ad79cddfcc575… │ "0446b3de736bca3d… │ 20 │ "3045022100804809… │ 1539017836747 │
├────────────────────┼────────────────────┼────────────────────┼────────────────────┼────────────────────┤
│ "041ad79cddfcc575… │ "0446b3de736bca3d… │ 12 │ "30460221008b13a5… │ 1539017874219 │
└────────────────────┴────────────────────┴────────────────────┴────────────────────┴────────────────────┘
查看地址余额(默认本地)) blance
iblockchain => blance 041ad79cddfcc575efdae26e46e14a13c600967aff1db6d7eba66f770d585c542dfaed897f72b5bc40595f5601a868837f63bface539350ac6d013b99d17a0fbeb
{
"address": "041ad79cddfcc575efdae26e46e14a13c600967aff1db6d7eba66f770d585c542dfaed897f72b5bc40595f5601a868837f63bface539350ac6d013b99d17a0fbeb",
"blance": 168
}
┌────────────────────┬────────────────────┐
│ address │ blance │
├────────────────────┼────────────────────┤
│ "041ad79cddfcc575… │ 168 │
└────────────────────┴────────────────────┘
查看网络节点列表 peer
iblockchain => peer
//output
┌────────────────────┬────────────────────┐
│ port │ address │
├────────────────────┼────────────────────┤
│ 8001 │ "47.94.5.240" │
├────────────────────┼────────────────────┤
│ 8002 │ "42.56.89.132" │
├────────────────────┼────────────────────┤
│ 59838 │ "124.127.208.135" │
├────────────────────┼────────────────────┤
│ 27122 │ "123.114.48.94" │
└────────────────────┴────────────────────┘
演示命令
帮助 help
iblockchain => help
计算sha256哈希 hash
iblockchain => hash imooc
//output
5401cc2e57b309427fd10963f8b8ee58545284e35bfba0e00780369307e54849
┌────────────────────┬────────────────────┐
│ hash │ value │
├────────────────────┼────────────────────┤
│ "5401cc2e57b30942… │ "imooc" │
└────────────────────┴────────────────────┘
演示挖矿逻辑 minedemo
iblockchain => minedemo imooc 2
// output
[信息] 数据是 imooc0 哈希值是25c771cbd916307a0417ebf4f8a705e8319bb100c93db4cde74f4fbca7da54d6
[信息] 数据是 imooc1 哈希值是3b8368f43662598160ade6788b0504d789700c59574613c3dffb8b467aab8d5f
[信息] 数据是 imooc2 哈希值是f3cf53d3b2d6f83ac857e8e018ee4bbd78c1fdd5d96660b20116d2bc6a4e281e
...省略很多条
[信息] 数据是 imooc248 哈希值是e6e8c271edec6c1b6f2b4bfa9725fecc0fe50356dcec47766440da2e29837e88
[信息] 数据是 imooc249 哈希值是d1e79e718588ae125252d88c4a373934ebab3a9b1015f50d89329a151b78e406
[信息] 数据是 imooc250 哈希值是008781ebdfdff9e1660841b4ab159f2cb6c3fca3217865366c30a1912d620cc5
根据私钥算出公钥 getpub
iblockchain => getpub imooc
私钥imooc计算出的公钥 04c8d1d62200e93e7bbf4b0c65da66d343656a6aebd51c146ed60f9dbbe39a4beededb5bbeeb1660269695d5a6959470c411c07545952e93f80460e76e31fcdde0
RSA私钥加密 sign
// 字符imooc作为私钥 对信息imoocrocks进行签名
iblockchain => sign imoocrocks imooc
签名 304402206cc8d37c9e9ac3d679267aa0203550e04e7bb7ee6ba3f6c2193b597aa9bdaa58022029e54e94065c2a377a7632bdda0f51b6bd8e28c8667568459b2329683deb8db8
RSA公钥验证签名 verify
iblockchain => verify imoocrocks 04c8d....dde0 3044....8db8
true
校验区块链是否合法 valid
iblockchain => valid
校验结果: true
篡改blockchain交易数据 update
iblockchain => update 16
修改了 转账金额从20=>21
iblockchain => valid
[错误]: 第 16个区块hash不对,算出的是b2f20b3bde5fe69ab5d5092f50222ea57c980902d4709de19563e2e797759efd 区块里本来的hash是000001b0538910078e426c2989d561a4f715ab11838545ce4efe7838754f5fef 看来数据被篡改了
[错误]: 第16个区块不合法
校验结果: false
重新对一个区块挖矿修复 mineblock
iblockchain => mineblock 16
[错误]: 第 16个区块hash不对,算出的是b2f20b3bde5fe69ab5d5092f50222ea57c980902d4709de19563e2e797759efd 区块里本来的hash是000001b0538910078e426c2989d561a4f715ab11838545ce4efe7838754f5fef 看来数据被篡改了
[信息]: 区块16修复完毕
退出 exit
iblockchain => exit
[信息]: 网络一线牵，珍惜这段缘 再见
一些p2p网络传递的信息
[信息]: 交易合法 新增一下 { from: '0444d....bcf1'
[信息]: 挖矿结束 用时0.50s , 算了69438次, 哈希值是0000050c2b1b65a01659e85a17dfc3ad96fe8548dfaf694ff88ae478832ac37d，入账100 请笑纳
[信息]: 大家快去和新朋友打个招呼
[信息]: 有人挖矿成功，我们恭喜这位幸运儿
....
更多信息
- 知乎
- 如何写出这个demo(教程)
联系
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协议
MIT
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