I'm currently working through a complete Identity setup without using Entity framework. This is taking me to difficult places as the source for this library is yet to be released. It involves lots of reading and guessing. One area of confusion is the Security Stamp.
You can read about the description over at stack overflow http://stackoverflow.com/questions/19487322/what-is-asp-net-identitys-iusersecuritystampstoretuser-interface.
This is the best I found, but it still wasn't enough for the full blown, non EF version.