2014-11-29 UTC
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aquarius I'm sure someone must have already thought of this, but my google-fu is weak today. Wouldn't a hashcash approach be useful against webmention spam? So you POST source=http://source/article&target=http://target/whatever&time=1417292519&nonce=5684712, where sha256(http://target/whatever+1417292519) starts with "000000" and time is less than, say, five minutes ago? So it takes 5 seconds to generate the nonce, which