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Just my opinion, but this is something I am really not looking forward too. My main concern is that anyone can just scan your card in to their "coin" and have all your info. I know that these types of things already exist, but it still makes me feel a bit uneasy. Of course, I don't know everything about this product and could be wrong, but I do think the rate of credit/debit card theft will go up.
An easy countermeasure would be to have the "coin" send a message to the credit card company or bank when you add a card. The company/bank could then send a confirmation letter to the user that the user has to accept or the card will be canceled.
P.S. I'm not trying to rip on the device. I actually think it's a cool idea. I just hope security was their #1 priority with a device like this.
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