More README explanation about what needs to happen next

README.md

@@ -29,3 +29,31 @@ cargo watch -x "run -- run -- node2"
 cargo watch -x "run -- run -- node3"
 cargo watch -x "run -- run -- node4"
 ```
+
+## Discussion
+
+What we have here is a very simple system comprised of two key parts: the Side Node, and the Side Watcher.
+
+### Side Node(s)
+
+The Side Nodes make up a system of BFT-CRDT-producing nodes that can make a blockchain. Currently they can reliably send transactions to each other in a secure way, such that all nodes they communicate with can tell whether received transactions are obeying the rules of the system.
+
+TODO:
+
+[ ] enable Side Nodes to download current P2P chain state so that they start out with a consistent copy of transaction data
+[ ] add smart contract execution engine (CosmWasm would be a good first choice)
+[ ] enable Side Nodes to download contract code for a given contract
+[ ] enable Side Nodes to download current contract state for a given contract
+[ ] switch to full P2P messaging instead of websockets
+[ ] take the Side Watcher out of the system by electing a Side Node as a leader, so that agreement about transaction inclusion can be reached for a given block.
+
+### Side Watcher
+
+The Side Watcher is a simple relayer node that sits between the Side Chain (Cosmos) and the decentralized Side Nodes. At the moment, it simply relays transactions between nodes via a websocket.
+
+Next, the Side Watcher needs to:
+
+[ ] make a block for the P2P when the Side Chain creates a block (see litepaper)
+[ ] submit P2P chain data to the Side Chain
+
+Later, we will aim to remove the Side Watcher from the architecture, by (a) moving to pure P2P transactions between Side Nodes, and (b) doing leader election of a Side Node to reach agreement on the submitted block.