So in theory, the cards always represent the value of BTC stored on the card, but you can never use it for payment... if the value is lower or higher than the amount stored on the card. The bitcoins never leave the card, right? So this is more like a collectible than a currency and a store of value. < It can be a currency, but then you have to pay the exact amount, stored on the card?>
Or... Do you use it as a hardware wallet, where the coins are continuously funded and used as a currency, but the content of the card is accessed and changed via a NFC phone?
I am still trying to figure our how you going to use this.
Or... Do you use it as a hardware wallet, where the coins are continuously funded and used as a currency, but the content of the card is accessed and changed via a NFC phone?
I am still trying to figure our how you going to use this.
No, you can spend the value held on the card. You need an NFC able phone and the app can then verify the balance and spend it. They are reusable as you can top them up. Have a look at tangem.com they look pretty cool if the price becomes reasonable.