The peers gossip using compressed bitfields in regards to what data they have. These bitfields are super small so we can pack quite a bit of information.

At the moment we don't do anything special in regards to discovery, but as we scale that's something we want to investigate. Since everything is running on append-only logs we can group the data into sections quite easily so there is some easy wins we can do there with announcing to the dht that you have data in a specific region.