[latchkey]

> I agree, but I already have a California DMV app that does this. It doesn't need a ZKP.

What happens when you aren't in California? Or what happens when someone from outside of California comes to a bar.

> Indeed my argument is that ZKP seems unnecessary in this example, and yes it's extremely hard for me to appreciate the usefulness of a ZKP with an example where it seems useless.

Then go find better examples if you're this interested.