create a distributed register in go

main.go
type Block struct {
    Index     int
    Timestamp string
    Data      string
    PrevHash  string
    Hash      string
    Nonce     int
}

type Blockchain struct {
    chain []*Block
}
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main.go
func (b *Blockchain) GenerateBlock(data string) *Block {
    prevBlock := b.GetPreviousBlock()
    newBlock := &Block{
        Index:     prevBlock.Index + 1,
        Timestamp: time.Now().String(),
        Data:      data,
        PrevHash:  prevBlock.Hash,
    }
    newBlock.MineBlock()
    b.chain = append(b.chain, newBlock)
    return newBlock
}

func (b *Block) MineBlock() {
    target := getTarget()
    for !b.validateNonce(target) {
        b.Nonce++
        b.Hash = calculateHash(b)
    }
}
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main.go
func (b *Blockchain) IsValid() bool {
    for i := 1; i < len(b.chain); i++ {
        currentBlock := b.chain[i]
        prevBlock := b.chain[i-1]

        if currentBlock.Hash != calculateHash(currentBlock) {
            return false
        }

        if currentBlock.PrevHash != prevBlock.Hash {
            return false
        }
    }
    return true
}

func (b *Block) validateNonce(target string) bool {
    hash := calculateHash(b)
    return hash[:len(target)] == target
}
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