基本原型

区块的结构：
　　1、在区块链中，存储有效信息的是区块
　　2、Timestamp是当前时间戳，也就是创建区块的时间
　　3、PrevBlockHash存储前一个区块的哈希值
　　4、Data是区块存储的实际有效的信息
　　5、Hash是当前区块的哈希值

block.go

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package core   import (     "time"     "strconv"     "bytes"     "crypto/sha256" )   //Block keeps block header type Block struct {     Timestamp       int64   //区块创建的时间     Data            []byte  //区块包含的数据     PrevBlockHash   []byte  //前一个区块的哈希值     Hash            []byte  //区块自身的哈希值，用于校验区块数据有效 }   //NewBlock create and returns Block func NewBlock(data string, prevBlockHash []byte) *Block {     block := &Block{         Timestamp:time.Now().Unix(),         Data: []byte(data),         PrevBlockHash: prevBlockHash,         Hash: []byte{},     }     block.SetHash()     return block }   func (b *Block) SetHash() {     timestamp := []byte(strconv.FormatInt(b.Timestamp, 10))     headers := bytes.Join([][]byte{b.PrevBlockHash, b.Data, timestamp},[]byte{})     hash := sha256.Sum256(headers)     b.Hash = hash[:] }   //NewGenesisBlock create and returns genesis Block func NewGenesisBlock() *Block {     return NewBlock("Genesis Block", []byte{}) }package core   //BlockChain keeps a sequence of Blocks type BlockChain struct {     Blocks []*Block }   //AddBlock save provided data as a block in the blockchain func (bc *BlockChain)AddBlock(data string) {     prevBlock := bc.Blocks[len(bc.Blocks)-1]     newBlock := NewBlock(data, prevBlock.Hash)     bc.Blocks = append(bc.Blocks, newBlock) }   //NewBlockChain create a new BlockChain with genesis block func NewBlockChain() *BlockChain {     return &BlockChain{[]*Block{NewGenesisBlock()}} } package main   import (     "core"     "fmt" )   func main() {       bc := core.NewBlockChain()       bc.AddBlock("Send 1 BC to Ivan")     bc.AddBlock("Send more BC to Ivan")       for _,block := range bc.Blocks {         fmt.Printf("Prev hash: %x\n", block.PrevBlockHash)         fmt.Printf("Data: %s\n", block.Data)         fmt.Printf("Hash: %x\n", block.Hash)         fmt.Println()     }   }

区块组成链式结构：
　　1、区块链是有着特定结构的数据库，一个有序向后连接的列表
　　2、区块按照插入顺序进行存储，每个块都被链接到前一个块
　　3、快速的获取链上的最新块，并且高效的通过哈希来校验一个块

blockchain.go

　main.go

　　

打印结果：

Prev hash:
Data: Genesis Block
Hash: 4577853922f097265b130464cb5392785b2fd045b724d9525dad859a629e4b0d

Prev hash: 4577853922f097265b130464cb5392785b2fd045b724d9525dad859a629e4b0d
Data: Send 1 BC to Ivan
Hash: e8bc5d03b38799140e32d662376731705f716c0443e1a17c1a45782fa1531c81

Prev hash: e8bc5d03b38799140e32d662376731705f716c0443e1a17c1a45782fa1531c81
Data: Send more BC to Ivan
Hash: 790c1a271f5a138aa2093cd236ffeadb5d6d905f841ceccb04606e3aec5b2735