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Are the same NFC standard as boltcards? If yes, you can reuse them as boltcards. The NFC chip should be the same.
Plebtag webpage have good documentation about NFC cards
https://plebtag.com/nfc-news/
https://plebtag.com/links/
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hahahaha cool collection !
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That's much better alternative, I agree. I did something similar three years ago. Not using cards, just printing out some custom postcards with a QR code on it. It worked really well, two contacted me to learn about lightning and redeemed the sats.
So what should I do with these satscards? Just gift them empty?