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@inertia
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In theory, you could install one of these inside a vending machine. If you want to buy a candy bar, the vending machine generates a bitcoin address for you to send funds to and displays it as a QR code.

It could then just watch the mempool for your transaction. Obviously, just watching the mempool exposes the machine to double-spend attack, but maybe there's a tradeoff in cost risk when you don't need to run any internet infrastructure for your vending machine.

Hopefully the satellite signal also carries the current fiat prices.

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