The biggest issue I see here is, how do you store and backup notes while keeping them private. Requiring users to run their own relay for this is a non-starter if you want more than a few people to use it. How can we send encrypted notes to public relays that can only be read by the user who wrote them? cc nostr:nprofile1qy2hwumn8ghj7erfw36x7tnsw43z7un9d3shjqpq60t5zfxalddaccdc7xx30sentwa5lrr3rq4rtm38x99ynf8t0vwscjedk7, I'm too dumb to reason this out myself lol