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A comment on DOOM Captcha. Parent comment

Re:DOOM Captcha by sodality2 on Monday May 24, 2021 @10:45PM (#27272109)
Ideally you'd have something that's hard for the client but easy for the server to verify, though. so maybe prime factoring?
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Re:DOOM Captcha by tshaddox on Tuesday May 25, 2021 @12:38AM (#27272643)
Or, the server provides a random string of bits with length n and requires a string of bits with length n+m that starts with the provided n bits and whose SHA-1 hash begins with 20 zero bits.
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Re:DOOM Captcha by wruza on Tuesday May 25, 2021 @03:55AM (#27274104)
What nonceness!
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