Yes, nostr:npub1cpstx8lzhwctunfe80rugz5qsj9ztw8surec9j6mf8phha68dj6qhm8j5e was talking to me about those circles and it got me thinking.
so authenticated relays with access determined by membership in the circle?
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Precisely. At the moment, the circle is just a shared list.
But npubs can't actually share a kind 3000 list, you see. And lists get too long, you see.