区块链V2版本实现之三

 1 func (pow *ProofOfWork) IsValid() bool {
 2    //在校验的时候，block的数据是完整的，我们要做的是校验一下，Hash，block数据，和Nonce是否满足难度值要求
 3 
 4    //获取block数据
 5    //拼接nonce
 6    //做sha256
 7    //比较
 8    
 9    data := pow.prepareData(pow.block.Nonce)
10    hash := sha256.Sum256(data)
11 
12    var tmp big.Int
13    tmp.SetBytes(hash[:])
14 
15    //if tmp.Cmp(pow.target) == -1 {
16    // return true
17    //}
18    // return false
19 
20    return tmp.Cmp(pow.target) == -1
21 }

 1 package main
 2 
 3 import (
 4    "fmt"
 5    "time"
 6 )
 7 
 8 func main()  {
 9    fmt.Printf("HelloWorld!!!\n")
10 
11    ////区块实例化
12    //block := NewBlock(genesisInfo,[]byte{0x0000000000000000})
13    bc := NewBlockChain()
14    bc.AddBlock("哈哈哈哈哈")
15 
16    for i, block := range bc.Blocks{
17       //区块打印
18       fmt.Printf("+++++++++++++++ %d ++++++++++++++\n", i)
19       fmt.Printf("Version : %d\n", block.Version)
20       fmt.Printf("PrevBlockHash : %x\n", block.PrevBlockHash)
21       fmt.Printf("MerKleRoot : %x\n", block.MerKleRoot)
22 
23       timeFormat := time.Unix(int64(block.TimeStamp), 0).Format("2006-01-02 15:04:05")
24       fmt.Printf("TimeStamp : %s\n", timeFormat)
25 
26       fmt.Printf("Difficulity : %d\n", block.Difficulity)
27       fmt.Printf("Nonce : %d\n", block.Nonce)
28       fmt.Printf("Hash : %x\n", block.Hash)
29       fmt.Printf("Data : %s\n", block.Data)
30 
31       pow := NewProofOfWork(block)
32       fmt.Printf("IsValid : %v\n", pow.IsValid())
33    }
34 }