I'm looking at it in a proof of stake kinda way. Why not encrypted unique strings that match a trusted person (such as the way Bank Identification Numbers serve a purpose). Encrypted strings that contain info like, where was this token created(BIN), who has current ownership etc. The string is only valid for use by the current owner
Something like this:
Don't know but...... thesis :v
I'll get back to this when I get more info.