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Re:Full-disclosure – Administrivia: The End by a124556 on Wednesday March 19, 2014 @11:21AM (#7429223)
Something like this? http://www.btcmessenger.com/?page=send just filter it for spam like we do with normal email, maybe an application anyone can run instead of a website that can be taken down.

Also, is there a provable way to generate a public bitcoin address without learning the private key? As a way to keep it fair.

Re:Full-disclosure – Administrivia: The End by sounds on Wednesday March 19, 2014 @11:58AM (#7429542)
To what you said: yes. Except to not store the messages in the blockchain, which removes the need to generate a bitcoin address.

However, there are some implementation issues that need to be resolved, e.g. on github.