title: Is the ClaimedIdentifier the unique one (DotNetOpenAuth)
body: <p>I'm using now DotNetOpenAuth for doing login with OpenId</p>
  
  <p>I looked at their OpenIdRelyingPartyMvcDemo and at the NerdDinner mvc demo</p>
  
  <p>and both applications are using the <code>response.ClaimedIdentifier</code> to log in the users, e.g.</p>
  
  <pre><code> FormsAuthentication.SetAuthCookie(response.ClaimedIdentifier, false);
  </code></pre>
  
  <p>so I just want to be sure, <strong>is this the one that is unique for each user, and it will never change?</strong> (so that I could save it in my DB and bind it to everything needed)</p>
  
  <p><em>I see many SO posts says it's VerifiedIdetifier but the DotNetOpenAuth response object doesnt has this</em></p>