Part 10

.gitignore

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+tmp/

README.md

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+# Golang Blockchain
+
+### In this tutorial, we add a Wallet Module to our Blockchain app. 
+
+## Run `go run main.go` to run the app, run `go build main.go` to build an executable file.
+
+### Check out the Youtube Tutorial for this [Go Program](https://youtu.be/O9rDas-0s2c). Here is our [Youtube Channel](https://www.youtube.com/channel/UCYqCZOwHbnPwyjawKfE21wg) Subscribe for more content.
+
+### Check out our blog at [tensor-programming.com](http://tensor-programming.com/).
+
+### Our [Twitter](https://twitter.com/TensorProgram), our [facebook](https://www.facebook.com/Tensor-Programming-1197847143611799/) and our [Steemit](https://steemit.com/@tensor).

blockchain/block.go

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+package blockchain
+
+import (
+	"bytes"
+	"encoding/gob"
+	"log"
+	"time"
+)
+
+type Block struct {
+	Timestamp    int64
+	Hash         []byte
+	Transactions []*Transaction
+	PrevHash     []byte
+	Nonce        int
+	Height       int
+}
+
+func (b *Block) HashTransactions() []byte {
+	var txHashes [][]byte
+
+	for _, tx := range b.Transactions {
+		txHashes = append(txHashes, tx.Serialize())
+	}
+	tree := NewMerkleTree(txHashes)
+
+	return tree.RootNode.Data
+}
+
+func CreateBlock(txs []*Transaction, prevHash []byte, height int) *Block {
+	block := &Block{time.Now().Unix(), []byte{}, txs, prevHash, 0, height}
+	pow := NewProof(block)
+	nonce, hash := pow.Run()
+
+	block.Hash = hash[:]
+	block.Nonce = nonce
+
+	return block
+}
+
+func Genesis(coinbase *Transaction) *Block {
+	return CreateBlock([]*Transaction{coinbase}, []byte{}, 0)
+}
+
+func (b *Block) Serialize() []byte {
+	var res bytes.Buffer
+	encoder := gob.NewEncoder(&res)
+
+	err := encoder.Encode(b)
+
+	Handle(err)
+
+	return res.Bytes()
+}
+
+func Deserialize(data []byte) *Block {
+	var block Block
+
+	decoder := gob.NewDecoder(bytes.NewReader(data))
+
+	err := decoder.Decode(&block)
+
+	Handle(err)
+
+	return &block
+}
+
+func Handle(err error) {
+	if err != nil {
+		log.Panic(err)
+	}
+}