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Show HN: Use blockchain technology to secure site from web spam
(
hashcash.io
)
4 points
by
hippich
on Aug 28, 2015
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past
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1 comment
Hashcash.IO Project Update
(
hashcash.io
)
1 point
by
hippich
on July 22, 2014
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past
Show HN: Replace CAPTCHA with Proof-of-Work
(
hashcash.io
)
89 points
by
hippich
on June 25, 2014
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past
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92 comments
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