An ordered and back-linked list in Go

pseudo-blockchain.go

package blockchain

import (
	"bytes"
	"crypto/sha256"
	"strconv"
	"time"
)

type Blockchain struct {
	blocks []*Block
}

func (b *Blockchain) AddBlock(data string) {
	prevBlock := b.blocks[len(b.blocks)-1]
	newBlock := NewBlock(data, prevBlock.Hash)
	b.blocks = append(b.blocks, newBlock)
}

type Block struct {
	Timestamp     int64
	Data          []byte
	PrevBlockHash []byte
	Hash          []byte
}

func NewBlock(data string, prevBlockHash []byte) *Block {
	block := &Block{
		Timestamp:     time.Now().Unix(),
		Data:          []byte(data),
		PrevBlockHash: prevBlockHash,
	}
	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[:]
}