The cardSealedYours
It arrives as data and stays locked.
The number, expiry date and security code are stored encrypted. You unseal them in your space with a fresh authenticator code, and after sixty seconds they lock themselves again. Each shop decides which cards it accepts.
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Encrypted at rest
Nobody reads the full number from a database dump.
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A code to reveal
Your authenticator app, every single time.
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Hides after 60 s
The details fold away on their own, even if you forget.


