Basic concept of blockchain

Blockchain/Models/Blockchain.swift

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+//
+//  Blockchain.swift
+//  Blockchain
+//
+//  Created by Victor BODINAUD on 27/02/2020.
+//  Copyright © 2020 Victor BODINAUD. All rights reserved.
+//
+
+import Foundation
+
+class Blockchain {
+    var chain = [Block]()
+    
+    func createGenesisBlock(data: String) {
+        let genesisBlock = Block()
+        genesisBlock.data = data
+        genesisBlock.previousHash = "0000"
+        genesisBlock.index = 0
+        genesisBlock.hash = genesisBlock.generateHash()
+        chain.append(genesisBlock)
+        print("Genesis block created -- hash: \(genesisBlock.hash ?? "")")
+    }
+    
+    func createBlock(data: String) {
+        let newBlock = Block()
+        newBlock.data = data
+        newBlock.previousHash = chain[chain.count-1].hash
+        newBlock.index = chain.count
+        newBlock.hash = newBlock.generateHash()
+        chain.append(newBlock)
+        
+        print("Block \(newBlock.index ?? 0) created -- hash: \(newBlock.hash ?? "") previous hash: \(newBlock.previousHash ?? "") data: \(newBlock.data ?? "")")
+    }
+}