edit README.md

README.md

@@ -1,2 +1,108 @@
 # goPoS
-A golang implemention of Proof-of-Stake
+#### 1. 基本结构
+
+##### 1.1 区块结构
+
+```go
+type Block struct {
+	Number    int
+	BPM       int
+	Hash      string
+	PrevHash  string
+	Validator string
+	Timestamp time.Time
+}
+```
+
+其中`BPM`用于之后的共识。
+
+##### 1.2 区块链结构
+
+```go
+var Blockchain []Block
+```
+
+#### 2. 区块操作
+
+##### 2.1 生成区块
+
+```go
+func GenerateBlock(prevBlock Block, BPM int, address string) Block {
+	return newBlock
+}
+```
+
+##### 2.2 计算Hash
+
+```go
+func (b *Block) CalculateBlockHash() string {
+	record := string(b.Number) + b.Timestamp.String() + string(b.BPM) + b.PrevHash
+	return calculateHash(record)
+}
+```
+
+在这里使用的是`sha256`的`Hash`计算方法。
+
+##### 2.3 验证区块
+
+```go
+func IsBlockValid(newBlock, prevBlock Block) bool {
+	if prevBlock.Number+1 != newBlock.Number {
+		return false
+	}
+	if prevBlock.Hash != newBlock.PrevHash {
+		return false
+	}
+	if newBlock.CalculateBlockHash() != newBlock.Hash {
+		return false
+	}
+	return true
+}
+```
+
+#### 3. 共识过程
+
+##### 3.1 生成创世区块，并生成区块链
+
+```go
+genesisBlock = Block{0, 0, "", "", "", t}
+Blockchain = append(Blockchain, genesisBlock)
+```
+
+##### 3.2 获取数据
+
+执行`PoS`需要获取每个节点的`Balance`和`BPM`信息：
+
+```go
+// 获取 Balance 信息
+for scanBalance.Scan() {
+	balance, err := strconv.Atoi(scanBalance.Text())
+	validators[address] = balance
+}
+// 获取 BPM 信息
+for {
+	bpm, err := strconv.Atoi(scanBPM.Text())
+	newBlock := GenerateBlock(prevLastIndex, bpm, address)
+	if IsBlockValid(newBlock, prevLastIndex) {
+		candidateBlocks = append(candidateBlocks, newBlock) // 将新生成的区块放入到候选区块中
+	}
+}
+```
+
+##### 3.3 选择获胜者
+
+将每个用户的`Stake`作为权重，并从中随机选择获胜者：
+
+```go
+k, ok := setValidators[block.Validator]
+	if ok {
+		for i := 0; i < k; i++ {
+			lotteryPool = append(lotteryPool, block.Validator)
+		}
+	}
+}
+s := rand.NewSource(time.Now().Unix())
+r := rand.New(s)
+lotteryMiner := lotteryPool[r.Intn(len(lotteryPool))]
+```
+