Mining/Proof-Of-Work Rewards.

BasicBlockChain/BlockChain.cs

@@ -6,14 +6,17 @@ namespace BasicBlockChain
 {
     public class BlockChain
     {
+        private List<Transaction> _pendingTransactions = new List<Transaction>();
         public List<Block> Chain { get; } = new List<Block>();
         public int Difficulty { get; set; } = 2;
+        public int Reward { get; set; } = 1_000_000;
 
-        public BlockChain(DateTime? genesisDate = null, int difficulty = 2)
+        public BlockChain(DateTime? genesisDate = null, int difficulty = 2, int reward = 1_000_000)
         {
             Block genesisBlock = new Block(genesisDate ?? DateTime.UtcNow, null, null);
             genesisBlock.Mine(difficulty);
             Difficulty = difficulty;
+            Reward = 1_000_000;
             Chain.Add(genesisBlock);
         }
 
@@ -25,6 +28,21 @@ namespace BasicBlockChain
             Chain.Add(newBlock);
         }
 
+        public void AddTransaction(Transaction transaction)
+        {
+            _pendingTransactions.Add(transaction);
+        }
+
+        public void ProcessPendingTransactions(DateTime date, string miner)
+        {
+            Block lastBlock = Chain.Last();
+            Block newBlock = new Block(date, lastBlock, _pendingTransactions);
+            newBlock.Transactions.Add(new Transaction(null, miner, Reward, date));
+            newBlock.Mine(Difficulty);
+            Chain.Add(newBlock);
+            _pendingTransactions.Clear();
+        }
+
         public bool Verify()
         {
             for (int i = 1; i < Chain.Count; i++)

BasicBlockChain/Program.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 
 namespace BasicBlockChain
 {
@@ -14,9 +13,12 @@ namespace BasicBlockChain
             Console.WriteLine("#### Mining BlockChain with sample data");
             var startTime = DateTime.UtcNow;
             BlockChain nullCoin = new BlockChain(genesisDate: new DateTime(2000, 1, 1), difficulty: 2);
-            nullCoin.AddBlock(new DateTime(2000, 1, 2), new List<Transaction> { new Transaction("VAR", "NAM", 10_000_000) });
+            nullCoin.AddTransaction(new Transaction("VAR", "NAM", 10_000_000, new DateTime(2000, 1, 2)));
-            nullCoin.AddBlock(new DateTime(2000, 1, 3), new List<Transaction> { new Transaction("NAM", "VAR", 5_000_000) });
+            nullCoin.ProcessPendingTransactions(new DateTime(2000, 1, 2), "Kable");
-            nullCoin.AddBlock(new DateTime(2000, 1, 4), new List<Transaction> { new Transaction("NAM", "VAR", 5_000_000) });
+            nullCoin.AddTransaction(new Transaction("NAM", "VAR", 5_000_000, new DateTime(2000, 1, 3)));
+            nullCoin.ProcessPendingTransactions(new DateTime(2000, 1, 3), "Kable");
+            nullCoin.AddTransaction(new Transaction("NAM", "VAR", 5_000_000, new DateTime(2000, 1, 4)));
+            nullCoin.ProcessPendingTransactions(new DateTime(2000, 1, 4), "Kable");
             Console.WriteLine(jsonWriter.Write(nullCoin));
             var endTime = DateTime.UtcNow;
             Console.WriteLine($"Duration: {endTime - startTime}");
@@ -27,18 +29,19 @@ namespace BasicBlockChain
             // Show balance
             Console.WriteLine("Balance of \"{0}\": {1}", "VAR", nullCoin.GetMicroCoinBalance("VAR"));
             Console.WriteLine("Balance of \"{0}\": {1}", "NAM", nullCoin.GetMicroCoinBalance("NAM"));
+            Console.WriteLine("Balance of \"{0}\": {1}", "Kable", nullCoin.GetMicroCoinBalance("Kable"));
 
             // Tamper with the data
             Console.WriteLine();
             Console.WriteLine("#### Tampering with the data");
-            nullCoin.Chain[1].Transactions.Clear();
+            nullCoin.Chain[1].Transactions[0].MicroCoinAmount = 1000_000_000;
-            nullCoin.Chain[1].Transactions.Add(new Transaction("VAR", "NAM", 1000_000_000));
             Console.WriteLine(jsonWriter.Write(nullCoin));
 
             // Verify
             Console.WriteLine("BlockChain is Valid? {0}", nullCoin.Verify() ? "True" : "False");
             Console.WriteLine("Balance of \"{0}\": {1}", "VAR", nullCoin.GetMicroCoinBalance("VAR"));
             Console.WriteLine("Balance of \"{0}\": {1}", "NAM", nullCoin.GetMicroCoinBalance("NAM"));
+            Console.WriteLine("Balance of \"{0}\": {1}", "Kable", nullCoin.GetMicroCoinBalance("Kable"));
 
             Console.Read();
         }

BasicBlockChain/Transaction.cs

@@ -1,16 +1,20 @@
-namespace BasicBlockChain
+using System;
+
+namespace BasicBlockChain
 {
     public class Transaction
     {
         public string Sender { get; set; }
         public string Receiver { get; set; }
         public long MicroCoinAmount { get; set; }
+        public DateTime Date { get; set; }
 
-        public Transaction(string sender, string receiver, long microCoinAmount)
+        public Transaction(string sender, string receiver, long microCoinAmount, DateTime date)
         {
             Sender = sender;
             Receiver = receiver;
             MicroCoinAmount = microCoinAmount;
+            Date = date;
         }
     }
 }