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this post was submitted on 26 Jun 2023
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Asklemmy
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Haha, I like this one! Had to strike a balance between 'make it annoying enough to deter bots' and 'make it accessible enough to allow humans'. Might be hard, because people have vastly different hardware. Personally, I probably would be fine waiting for 1s, maybe up to 5s. Not sure if that is enough to keep the bots out. As far as I understand, they would still try (and succeed), just be fewer because signup takes more time.
I also like the side-effect of micro-supporting the instance you join with a one time fee. I expect haters to hate this quite a lot though.
The mCaptcha system Lemmy devs are/were working on integrating on the next version is based on this approach afaik.
It doesn't use any crypto but it does do "wasteful" proof-of-work calculations of some kind.
Doesn't have to be a crypto miner. Just has to be any sort of computationally intense task. I think the ideal would be some sort of JavaScript that integrates that along with the captcha. For example, have some sort of computationally difficult math problem where the server already knows the answer, and the answer is then fed into a simple video game engine to procedurally generate a 'level'. The keyboard and mouse input of the player would then be fed directly back to the server in real time, which could decide if it's actually seeing a human playing the correct level.