What's a good source to learn more about proxy relays? I'm trying to determine if my plan is feasible:

- users run their own proxy relays.

- their clients connect to their single proxy relay

- their proxy relay connects to other users' proxy relays

-- when "following" a user, your proxy relay is instructed to connect to that user's proxy relay, if it exists. Opposite for "unfollowing"

It's the last bit that I think may be the hard part.

For the context of this question, assume all Nostr users have an always-on personal server that runs their relay.