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W3C has published an extensive list of reCAPTCHA alternatives: https://www.w3.org/TR/turingtest/

W3C is requesting feedback for the document, if you'd like to make suggestions, please open an issue: https://github.com/w3c/apa/issues

That's a very informative document. Privacy Pass caught my eye: https://privacypass.github.io/ It's an extension that is currently only supported by Cloudflare's CAPTCHA, that pretty much stores tokens after you complete a CAPTCHA, and the next time instead of requiring you to complete a CAPTCHA again, it will use those tokens. The point is that it does it in an anonymity preserving way. You can fork their server for a custom implementation.

So now the spammers only need to solve one captcha?

And more broadly -- it's kind of funny, but the more we all just roll our own solutions to this, the less standardized the solutions, and the harder it is for spammers to scale.

These types of "blanket captchas" basically destroy browsing via something like Tor, right? I feel like I've seen people complain about Cloudflare's captchas when browsing ananymously.

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