Sure, unknowable or private relays should be totally feasible.

- An unknown relay could be achieved by starting a relay and just not telling anyone about it.

- You can control who can post to your relay with an allow list

- As for being completely "private", might require some modifications, but sounds plausible to build.

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Interesting, so in a way it's unknown how many relays there are cos there could be any number of ones known only via word of mouth.