btcmsg seems to be using proprietary software to encode and decode messages in the blockchain.

Did they expose their algorithm? If they shut down tomorrow, how can someone decode messages he stored using their service?

  • Please don't encourage this abuse of Bitcoin. If someone would like to implement a message service correctly, there are many developers on IRC willing to help. – Luke-Jr Jan 18 '12 at 22:51
  • Calling something "an abuse" without explaining is not really productive. bitcoin.stackexchange.com/questions/2631/… – ripper234 Jan 18 '12 at 23:28
  • Also, this is not an answer. FYI, when you have enough rep, you're supposed to leave this as a comment and not post an answer. – ripper234 Jan 18 '12 at 23:34

Their FAQ links to a document that describes the protocol, and they provide an open source Python client to decode the messages. The server implementation is also open source.

I put the client files + protocol spec on a github gist, just in case.

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