As per Grandmaster Robert Taylor:
As of March 1, 2023, all black belt certificates must be signed by Grandmaster Robert Taylor and Shihan Ron Haggerton and have an official school hanko to be considered authentic black belt rank certificates in Shodin Ji Do Karate. Non-official certificates will not be accepted or honored by any Shodin Ji Do school. If you have any questions, please feel free to contact Mr. Haggerton at ron.haggerton@shodinjido.com. Thank you.