I'm interested in this too. While I note the (slightly chaotic) plethora of NIPs[0], and many of them look blockchainy, NIP-01 looks ultra pragmatic, simple, and flexible for a bunch of possibilities, and is the only one that is required[1] to be implemented.

[0] https://github.com/nostr-protocol/nips#list

[1] https://nostr.com/the-protocol/nips