Agreed that the actual problem is not yet specified. Stronger, even: we haven't yet specified the users' requirements (from which we will derive the problems that need to be solved, etc.).

That is: there's a whole thread here which seems to be suggesting that there will be privacy guarantees and possibly identity verification measures...but nothing specific.

(Which is fine, this started out as you asking for possible features; I'm just suggesting that we may want to back up a bit.)