It’s definitely big, I can envision an offline Verifiable Credential similar to an OpenPGP DID via a presentation exchange.
https://gnupg.org/ftp/specs/OpenPGP-smart-card-application-3.4.1.pdf
I did it!
I can now issue a record (credential) to a NFC tag associated with a #nostr #safebox.
So I've proven I can have a fully functional wallet with only a NFC tag.
I can:
1. Pay to NFC Tag
2. Pay from NFC Tag
3. Present a record (i.e., prove) using a NFC Tag
4. Accept a Record using a NFC Tag.
and of course,
5. Login with a NFC Tag.
IMHO, this is BIG! It's now possible to have a wallet that exists independently of a phone, and which can be used with a super cheap NFC Tag.
Onward!
https://video.nostr.build/af0fcb97d28f770f72597039a937deccb7b313e3e8de8becd0e58e89122fbf25.mp4
Discussion
I'm totally familiar with presentation exchange protocols and decided to build everything from the ground up with nostr. Also card security - keeping all of the encryption and logic in the application versus the card actually makes things more secure. I also replicated the things I liked from the tokenized card payment system (Visa, Mastercard). The best thing about nostr is that I did not have to ask for permission to do what I am doing. I just built what I wanted.
I absolutely love it, I would like to check it out. Are you going to open source it? Does it require an invite?
What make/version NFC tag/card, and size do you recommend? I ran into limitations with NTAG215 tags only being 504 bytes.
I did notice you wrote a urn:vwi spec similar to a DID. Nostr is great because of the permission-less capabilities you mentioned. We actually have a chance of fliping the internet right side up again. 👏