Is there a 'process of elimination' in determining legit 10th dans?

from what I understand, there are NO 10th dans in the west which are also recognized in the East. is that right?

so let's say someone creates their own style and promotes themselves (or friends promote them in exchange for rank themselves). what would be the process of being recognized as a budo art? and if someone claims they are a budo art, how can someone verify if they are?

how does one verify rank and if something is budo? 'budo' suggests japanese, so does that mean they must be recognized by japan in order to claim budo status?

thanks, -Ed