We'll create fresh WordPress site with Open ID Delegate installed. You have 20 minutes to test the plugin after that site we'll be deleted.
With this very simple plugin you can use the blog URL to authenticate with OpenID using an another OpenID provider.
called Delegation.
In order to maximize performance the vars are contained in plugin file rather than storing in a database.
Due to security issue (https://wordpress.org/news/2011/06/passwords-reset/) php file is gpg signed, ID 7ED1BC0C.