[azxdmjla] One finger per bank biometric

You set up multiple anonymous accounts (in a regime that permits it) using biometric identification as access control.  However, to maintain anonymity, we want it not to be possible to tell that two different accounts belong to the same person.

One simple way to do it is to use different fingers for fingerprint identification on different accounts.  (The standard danger of injury to that finger).

The idea can be extended to the entire skin surface, internal scans, DNA.