Im trying to figure out a way to fix this problem of the outbox model... would it be possible to have a seperate type of relay working along side the standard ones just to hold user and relay metadata.. That can be truely decentralized kinda like bitcoiin.. where each node holds the same data. on top of that a signal system which tells the person you are posting to or replying to has a new note on a relay the are not pulling notes from. Would this be possible?