Add nonce & timestamp to block

Sources/Blockchain/Models/Blockchain.swift

@@ -16,6 +16,8 @@ class Blockchain {
         genesisBlock.data = data
         genesisBlock.previousHash = "0000"
         genesisBlock.index = 0
+        genesisBlock.nonce = 0
+        genesisBlock.timestamp = genesisBlock.generateTimestamp()
         genesisBlock.hash = genesisBlock.generateHash()
         chain.append(genesisBlock)
         print("Genesis block created -- hash: \(genesisBlock.hash ?? "")")
@@ -26,6 +28,8 @@ class Blockchain {
         newBlock.data = data
         newBlock.previousHash = chain[chain.count-1].hash
         newBlock.index = chain.count
+        newBlock.nonce = 0
+        newBlock.timestamp = newBlock.generateTimestamp()
         newBlock.hash = newBlock.generateHash()
         chain.append(newBlock)