using System;

public class Program

{

    public static void Main()

    {

        var g = Guid.NewGuid();

        Console.WriteLine(g);

        Console.WriteLine(g.ToString("N"));

        Int64 timestamp = 0;

        var bytes = new System.Collections.Generic.List<byte>();

        bytes.AddRange(System.BitConverter.GetBytes(timestamp));

        bytes.AddRange(g.ToByteArray());

        Console.WriteLine(Convert.ToBase64String(bytes.ToArray()));

    }

}