I work in retail, and I'll have to take a look at the NIP. Before I do, just some brainstorming notes.
The standard for item identity right now is the UPC, which is a global standard that has worked really well since it was launched in 1973. The EAN-13 version of the barcode could be incorporated into an NPC (Nostr Product Code) that includes additional information about ... anything really. It's all a hash that can include any number of embedded documentation and details. Items with the same UPC but coming from different factories in different countries around the world could be properly identified with source data, materials composition, labor details, applicable laws and Value Added Tax details, transportation logs, etc. and it would all fit in the nproduct hash via something like IPFS content hashing.
