Communications

Types of Communication in RChain

We can theorize that there will be 4 types: 

1. Low-level, internal peer-to-peer communication
    Provides the peer network topology.
    Mechanism by which blocks are exchanged.
    Could also provide the basis for other node-to-node communication such as that used by consensus.
    Might be wholly unrelated to namespaces, except for things like selecting blocks to propagate, etc.
2. Contract-to-contract communication "via the blockchain"
    Transactional communication "between contracts" along a name.
    Consensus guarantees ordering and blockchain guarantees delivery of this type of communication.
3. Contract-to-contract communication off the blockchain
    Used for ephemeral communications, as in a chat application.
    Used for "dark" communication, for private data exchange, for example.
    Should cost but is perhaps less expensive than on-blockchain communication.
    Fewer (no?) guarantees about, e.g., delivery or order.
4. Contract-to-world communication
    Useful for statistics gathering over, e.g., node and network performance
    Inward-bound implementation for ask-the-web or get-human-consensus oracle operations.
    Outward-bound implementation for contracts that provide blockchain-based standard protocols (HTTP, NFS, etc.).