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e1ven
on May 25, 2013
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BitMessage - Bitcoin Inspired Peer to Peer Encrypt...
It's been used in anti-spam systems many years, but never caught on, due to the differing speeds of systems.
http://en.wikipedia.org/wiki/Hashcash
Groxx
on May 25, 2013
[–]
Which can probably take the route Litecoin has taken, and adopt Scrypt so systems are much more similar in performance.
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http://en.wikipedia.org/wiki/Hashcash