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Veni, vedi, fish velocipede
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Basically have two QR code that is printed into a card/sticker etc... It has a sticky cover on top of it so people cannot snoop on the code before usage.
Upon theft/loss of card, you simply grab the nearest phone and have them scan either one of the QR code, (one is a url, and the other one is an
SMS). It will then send a one time password to disable the card.
This process is much faster than calling the bank.
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||So, you keep the QR code on your person?