TestBlockDataStructure.cs

class TestBlock
{
	public string Hash { get; set; }
	
	private int Nonce { get; set; }
	
	private int Index { get; }
	
	private string Data { get; }
	
	private TestBlockChain PreviousBlock { get; }
	
	private string Difficulty { get; }

	public TestBlockChain(int index, TestBlockChain previousBlock, string difficulty)
	{
		Index = index;
		PreviousBlock = previousBlock;
		Difficulty = difficulty;
		Hash = $"{Guid.NewGuid()}";
	}
	
	public void Mine()
	{
		while(!string.Equals(Hash.Substring(0, Difficulty.Length), Difficulty))
		{
			Hash = Sha256(Hash + Data + PreviousBlock.Hash + Nonce + Index);
			++Nonce;
		}
	}	
	
	public static string Sha256(string randomString)
	{
	    var crypt = new SHA256Managed();
	    string hash = String.Empty;
	    byte[] crypto = crypt.ComputeHash(Encoding.ASCII.GetBytes(randomString));
	    foreach (byte theByte in crypto)
	    {
	        hash += theByte.ToString("x2");
	    }
	    return hash;
	}
}