Ecash travels through the NFC chip from device to device, not through the internet. The sender's phone doesn't to be online to pay, like with real credit cards.
It's insane privacy combined with incredible UX. The best of both worlds.
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Which wallet are they using in this video?
Macadamia iOS
Pardon my ignorance, but does it have to be from the same mint to stay offline?
What's the best normie onramp to load up the Cashu app with sats if they don't have Bitcoin yet?