NIP-78: app-specific data.

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+NIP-78
+======
+
+Arbitrary custom app data
+-------------------------
+
+`draft` `optional` `author:sandwich` `author:fiatjaf`
+
+The goal of this NIP is to enable [remoteStorage](https://remotestorage.io/)-like capabilities for custom applications that do not care about interoperability.
+
+Even though interoperability is great, some apps do not want or do not need interoperability, and it that wouldn't make sense for them. Yet Nostr can still serve as a generalized data storage for these apps in a "bring your own database" way, for example: a user would open an app and somehow input their preferred relay for storage, which would then enable these apps to store application-specific data there.
+
+## Nostr event
+
+This NIP specifies the use of event kind `30078` (parameterized replaceable event) with a `d` tag containing some reference to the app name and context -- or any other arbitrary string. `content` and other `tags` can be anything or in any format.
+
+## Some use cases
+
+ - User personal settings on Nostr clients (and other apps unrelated to Nostr)
+ - A way for client developers to propagate dynamic parameters to users without these having to update
+ - Personal private data generated by apps that have nothing to do with Nostr, but allow users to use Nostr relays as their personal database