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> If you would turn it around and imagine a world without paper passports and government issued id's - what would you use as unique identifier for a person?

I'm not sure... but I'm also convinced that 'private corporation issued id' isn't fundamentally superior to 'government issued id' and has some challenges in terms of accountability.

> it's harder to kidnap someone and use their eye, as opposed to steal some other piece of identification

Is it? I use my eyes a helluva lot more than I use my government issued SSN. In fact, I've only taken my physical SSN card out of storage once, but I stare at random (potentially camera equipped) stuff all day. Of course you can still steal it from me by pretending to ask for ID, but that's true of my eye-print as well.

Being pwned does not solely mean having access to your eye in this case, also why should I trust a corporation more than a government?

Pubic key of their choosing.