Captcha or recaptcha is good enough imo, no point in reinventing the wheel. Alternatively, split instructions in an email and on the website. For ex: Send email with What is the square of 3 (sent as an image for every word) And on the website Email + 25 = xxxxx
this post was submitted on 26 Jun 2023
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Any bot? That's just impossible. We're going to have to tie identity back to meatspace somehow eventually.
An existing bot? I don't think I can improve on existing captchas, really. I imagine an LLM will eventually tip their hand, too, like giving an "as an AI" answer or just knowing way too much stuff.
Ask how much is 1 divided by 3; then ask to multiply this result by 6.
If the results looks like 1.99999999998 , it's 99.999999998% a bot.