public static void Main()
var stakeholderIdentity = 14564056;
var externalIdentity = (DateTime.UtcNow.Ticks + stakeholderIdentity).ToString();
Console.WriteLine("Original String: " + externalIdentity);
Console.WriteLine(externalIdentity.Length >= 10 ? externalIdentity.Substring(externalIdentity.Length-10, 10) : externalIdentity);