Hashwall – protection against spam and denial of service without a CAPTCHA (scottpeterjohnson.github.io) 4 points by nsajko 4y ago ↗ HN
[–] nsajko 4y ago ↗ This is what proof of work should have been used for, invented long before Bitcoin. But it seems to never have caught on.Purelymail uses the system to protect itself from spam: https://purelymail.comWikipedia links:https://en.wikipedia.org/wiki/Proof_of_workhttps://en.wikipedia.org/wiki/Hashcash
2 comments
[ 4.9 ms ] story [ 18.5 ms ] threadPurelymail uses the system to protect itself from spam: https://purelymail.com
Wikipedia links:
https://en.wikipedia.org/wiki/Proof_of_work
https://en.wikipedia.org/wiki/Hashcash