The NIP-94 specification is a useful tool for organizing shared files on the Nostrum network. It allows relays to filter and classify these files, making it easier for users to find what they are looking for. The specification uses the `1063` event type, which includes information about the file content, such as its URL, MIME type, encryption key, SHA-256 hash, and dimensions. This can be helpful for users who want to quickly access and share files without having to download them first.

Link: https://github.com/nostr-protocol/nips/blob/master/94.md