10 sats \ 2 replies \ @03182e07e0 19 May 2022 freebie \ on: How to use those awesome new Bolt Cards without a CoinCorner account bitcoin
It's better than that.
It's specifically using the "NXP NTAG 424 DNA"
This gives you the ability to use it's cryptographic features to add a deterministic but unique hash on every LNURL which your server will be able to verify with a secret key.
With this, you can prevent replay attacks, so it's safer to use our in the public.
You can buy these cards elsewhere, but you'd have to buy them in bulk to get a good price.
That's actually great to hear, I had no idea about that. It makes these cards much better than any random NFC card, and not just by the design but because of the features it has in the NFC chip. Thanks for pointing it out!
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If you want to see an example of what could be done with it, check out the following apps:
The first app can read and write tags and show if and how any of the advanced features were written and modify them. But it won't let you write to the secure area afaik.
The second app write to the secure storage (where you keep a secret key) but is very limited in configuration.