mail validation suggestions

I am using some thing like signup page, after the user finishes his registerati开发者_Python百科on form an email is send to him including a link which when pressed redirect him to page which confirm his registration , so any suggestions how to do that with google app engine (even the concept)

• create GUID - java.util.UUID.
• put this GUID into database table along with timestamp
• generate the confirmation link with GUID as a parameter and email it to the user
• once link is hit by the user, check that passed GUID exist in DB (and valid, not expired), complete registration and delete GUID record from database