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Re:Proof of work - an unobtrusive alternative to captchas by bsaunder on Friday May 06, 2011 @06:57AM (#2520613)
See also:

http://news.ycombinator.com/item?id=2368486

(there are lots of comments, a couple of months ago, it would have been easy to see which ones are "interesting", now you must read them all).

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