I'm sorry but I'm having difficulty understanding what you're trying to say. You still need a body to oversee adding entries, otherwise anyone could add anything? How do you verify exactly, you've just got a bunch of data, which may or may not be legitimate. It still boils down to the best way to protect voting, isn't by the more exotic systems whereby fudging can be done at scale. It's by making the exploits not scale and keeping anonymity by having another process for voter registration.

I'm not sure what the choice of media has to do with anything.

Who has told me what about what now?

No one requires these biometrics to make bank transactions. The bank can give you a simple security device, but with smartphones even that is optional now.

Biometrics, seriously?

Biometrics are only a one-time proof when eg you are issued a token. They can be replayed later and can't be used anywhere except where there's a physical security guard preventing tampering. And even then you trust the security guard.