Add Blockchain

.vscode/launch.json

@@ -0,0 +1,24 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Launch Package",
+      "type": "go",
+      "request": "launch",
+      "mode": "debug",
+      "program": "${workspaceFolder}"
+    },
+    {
+      "name": "Launch",
+      "type": "go",
+      "request": "launch",
+      "mode": "auto",
+      "program": "${fileDirname}",
+      "env": {},
+      "args": []
+    }
+  ]
+}

Block.go

@@ -0,0 +1,6 @@
+package main
+
+type Block struct {
+	hash         []byte
+	previousHash []byte
+}

Blockchain.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"crypto/sha256"
+	"fmt"
+)
+
+// Blockchain struct
+type Blockchain struct {
+	blocks []Block
+}
+
+func (bc *Blockchain) addBlock(block Block) {
+	bc.blocks = append(bc.blocks, block)
+}
+
+func newBlockchain() Blockchain {
+
+	blockchain := Blockchain{blocks: make([]Block, 0)}
+
+	genesisBlock := generateGenesisBlock()
+	blockchain.addBlock(genesisBlock)
+
+	return blockchain
+}
+
+func generateGenesisBlock() Block {
+	block := new(Block)
+	hasher := sha256.New()
+	s := fmt.Sprintf("%v", block)
+	sum := hasher.Sum([]byte(s))
+	block.hash = sum
+
+	return *block
+}

main.go

@@ -1,7 +1,14 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+)
 
 func main() {
-	fmt.Printf("hello, world\n")
+	blockchain := newBlockchain()
+
+	for _, v := range blockchain.blocks {
+		fmt.Println(v.hash)
+	}
+
 }