用Go语言打造区块链[1]

最早由李笑来处了解到。
中文翻译文字部分看这里：
https://zhuanlan.zhihu.com/p/29971930

学好Go语言走遍天下都不怕。以下代码建立了一个非常原始的电子账本：

package mainimport (    "bytes"    "crypto/sha256"    "fmt"    "strconv"    "time")type Block struct {    Timestamp     int64    Data          []byte    PrevBlockHash []byte    Hash          []byte}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[:]}/*    初始化第一个块*/func NewBlock(data string, prevBlockHash []byte) *Block {    block := &Block{time.Now().Unix(), []byte(data), prevBlockHash, []byte{}}    block.SetHash()    return block}type Blockchain struct {    blocks []*Block}/*    添加 区块*/func (bc *Blockchain) AddBlock(data string) {    prevBlock := bc.blocks[len(bc.blocks)-1]    newBlock := NewBlock(data, prevBlock.Hash)    bc.blocks = append(bc.blocks, newBlock)}func NewGenesisBlock() *Block {    return NewBlock("Genesis Block创始块", []byte{})}/*    用创始块创建一个区块链的函数*/func NewBlockchain() *Blockchain {    return &Blockchain{[]*Block{NewGenesisBlock()}} /*我不太理解这种语法,层层深入？*/}func main() {    /*       初始化    */    bc := NewBlockchain()    /*       添加记录    */    bc.AddBlock("Send 1 BTC TO L")    bc.AddBlock("Send 2 BTC to R")    /*      查看我们最终存储结果    */    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()    }}