Show HN: Replace CAPTCHA with Proof-of-Work (hashcash.io)
recommended by 1 user | 2014 | 89 points by hippich | web security | original thread |
One user recommended this thread. What they said:
abiogenesis Sep 1, 2020 | on: Ask HN: Captcha Alternatives? | context

This is one of the best methods to rate limit attackers. Something like https://news.ycombinator.com/item?id=7944540

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