I think we need to rework how we handle lists in Nostr. The way we do it now, any client can republish a list without any diff or reference to it's knowledge of the previous version means that clients will get a partial list or fail to get a list from relays and then publish an empty one. I just now noticed that i've lost all the people in my contacts...

If we had diff's or a signature chain for previous versions, we could handle this and merge / restore lists...