name@mydomain.com would be layer 3 correct? using the oauth services of mydomain.com to authenticate yourself as name@mydomain.com should be layer 3.5, not lay

name@mydomain.com would be layer 3 correct? using the oauth services of mydomain.com to authenticate yourself as name@mydomain.com should be layer 3.5, not layer 5. To me that comes before the "person" layer 4.