I'm creating some software and I need to do a one-time "humanity

>>62028268
bump

there aren't any that aren't slow as hell and easily defeated by bots

>>62028373
Are there any other proof of humanity systems?

>>62028268
Make your own. You'd probably only need like 20 or so of them.

>>62028405
that wouldn't be very secure, though

>>62028268
are there really none, though?

Series of custom non-googleable riddles?

>>62028469
>Nancy invested $6000 in a bond at a yearly rate of 3%. She earned $450 in
interest. How long was the money invested?
yeah that'll work