As I search for the source code of Asp.Net Identity, the project can be found on both github and codeplex. The problem is that both seem to be the main repository. Which one is the correct one?
Identity officially hosted on both Github and CodePlex.
You'll be find asp.net identity version 2.x source code in CodePlex but GitHub contains the latest source code which is version 3, part of ASP.NET vNext.
Also you'll find that there are number of differences in the version 2.x and version 3. Microsoft.AspNet.Indentity.Core and Microsoft.AspNet.OWin identity parts combined into one project named Microsoft.AspNet.Identity.