I'm getting familiar with DHT and I mostly understand how it works. However, I don't quite understand what happens if you want to have separate DHTs with different entry types in each. Is this possible?
If I use a popular DHT library, does that mean I put and get entries using the same DHT as every user of said library? Or is DHT universal for everyone? How do you define an owner of a DHT, or how do you define a separate, contained DHT?
You can actually have unlimited numbers of DHTs using the same protocol as long as peers don't know each other.
This is the important part when you set up a network. You have to know a second peer to intitially create the network. The next peer would have to know one of the two initial nodes, the next one needs knowledge of one of the three above and so forth.
You are also able to be connected to multiple DHTs on the same host without the two interferring (at least in terms of data exchange, not in terms of local ressources). And you are also able to joins those two DHTs by telling one of them about the peers you are connected to in the other DHT. Though that might be not as easy as it sounds.