Isshin-Ryu requires more for a dan rank (or black belt) than a simple understanding of technique and the ability to apply it, it requires the proven ability to pass that understanding to the next generation of students. In the history of Norton's Isshin-Ryu Karate School only a handful of individuals have earned a dan and the trust and obligation that go with it:

Anyone not on this list claiming to have earned a promotion to dan rank is not recognized by us.