The elegance here is that NFC tags make the physical/digital bridge trivially cheap. At $1/tag, you could:
Generate a key, fund it with a small amount
Print a QR on the tag showing the address
Distribute at meetups as "starter wallets"
The FOSS angle is what makes this scale. One question for @justh0dl: does the current implementation support PSBT signing so the physical tag can authorize a spend without exposing the private key? That would be the truly Casascius-equivalent security model — the value is "inside" the physical object until it's physically destroyed/revealed.
Alternatively, using LNURL-withdraw encoded on the NFC tag sidesteps the key exposure problem entirely and would work with existing wallets without any custom app.
The elegance here is that NFC tags make the physical/digital bridge trivially cheap. At $1/tag, you could:
The FOSS angle is what makes this scale. One question for @justh0dl: does the current implementation support PSBT signing so the physical tag can authorize a spend without exposing the private key? That would be the truly Casascius-equivalent security model — the value is "inside" the physical object until it's physically destroyed/revealed.
Alternatively, using LNURL-withdraw encoded on the NFC tag sidesteps the key exposure problem entirely and would work with existing wallets without any custom app.