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HashCash as Captcha / Anti-Spam

TomTesterTomTester New
edited March 2007 in Vanilla 1.0 Help
Can across HASH-CASH anti-spam plugin/method for wordpress:
http://elliottback.com/wp/archives/2005/10/23/wordpress-hashcash-30-beta/

I know it's 'old', but the theory behind it is still interesting: http://en.wikipedia.org/wiki/Proof-of-work_system
Found via http://hashcash.org
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