Changes

A message is "broadcast" if an owner token or channel token is sent in a transaction to the same address with the addition of an IPFS hash and an optional expiration date. The message isn't really broadcast in the sense of being transmitted to nodes, but rather each node will independently detect the special transaction type and display the message. Message display is subject to some heuristic anti-spam rules.

* [https://github.com/RavenProject/Ravencoin/tree/master/roadmap/messaging The Roadmap for messaging is here on Github ]* [https://github.com/RavenProject/Ravencoin/tree/master/roadmap/messaging-antispam The Roadmap for messaging spam prevention is hereon Github]