> One problem we couldn't figure out here though - how to protect the
> notes from unauthorized redeem. Like if someone else tries to reach your
> wallet with his own NFC - how can we distinguish between deliberate
> redeem by owner and fraudulent redeem by anybody else with custom built
> long range NFC antenna? Any ideas?

I think you'd need multiple factors to protect against that attack. Like
encrypting with a key that is printed on the note as an QR code.

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