二、PoS权益证明

2.1 产生区块

• 定义区块结构体

  type Block struct {
  	Index     int    // 高度
  	TimeStamp string // 时间戳
  	BPM       int    // 交易信息
  	HashCode  string // 哈希
  	PrevHash  string // 上一节点哈希
  	Validator string // 区块验证者：保存的是哪个节点对当前区块进行了挖矿
  }
  
  

• 产生首个区块

  func GenerateFirstBlock() Block {
  	var firstBlock Block
    firstBlock.BPM = 100
    firstBlock.PrevHash = "0"
    firstBlock.TimeStamp = time.Now().String()
    firstBlock.Validator = "创世区块"
    firstBlock.Index = 1
    firstBlock.HashCode = GenerateHashValue(firstBlock)
    return firstBlock
  }
  
  

• 产生新区块

  func GenerateNextBlock(oldBlock Block, BPM int, address string) Block {
  	var newBlock Block
  	newBlock.Index = oldBlock.Index + 1
  	newBlock.TimeStamp = time.Now().String()
  	newBlock.PrevHash = oldBlock.HashCode
  	newBlock.Validator = address
  	newBlock.BPM = BPM
  	newBlock.HashCode = GenerateHashValue(newBlock)
  	return newBlock
  }
  
  // 计算区块哈希值
  func GenerateHashValue(block Block) string {
  	var hashCode = block.PrevHash + block.HashCode + block.TimeStamp + block.Validator + strconv.Itoa(block.BPM) + strconv.Itoa(block.Index)
  	sha := sha256.New()
  	sha.Write([]byte(hashCode))
  	hashed := sha.Sum(nil)
  	return hex.EncodeToString(hashed)
  }
  
  

2.2 产生区块链

• 通过数组的形式，维护区块链业务

• 创建链

  var BlockChain []Block
  

• 定义网络中的节点结构体

  type Node struct {
  	tokens  int    // 记录有多少币
  	address string // 节点地址
  }
  
  

• 模拟权益比例1:2的两个用户挖矿

  // 创建创世区块
  firstBlock := GenerateFirstBlock()
  // 将创世区块添加到区块链中
  BlockChain = append(BlockChain, firstBlock)
  
  // 存放两个炒币者：权益比例1:2
  n[0] = Node{1000, "炒币者1"}
  n[1] = Node{2000, "炒币者2"}
  
  // 循环完成，addr前1000为炒币者1，后2000为炒币者2
  count := 0
  for i := 0; i < len(n); i++ {
  	for j := 0; j < n[i].tokens; j++ {
  		addr[count] = n[i].address
  		count++
  	}
  }
  
  // 随机选一个矿工
  rand.Seed(time.Now().Unix())
  rd := rand.Intn(3000)
  var addr = addr[rd]
  
  // 挖矿：挖矿节点就是随机选出的矿工节点
  secondBlock := GenerateNextBlock(firstBlock, 200, addr)
  BlockChain = append(BlockChain, secondBlock)
  fmt.Println(BlockChain)