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Modern buyers enjoy the convenience of digital payments, but not all\npoints of sale always have an Internet connection. Trusting the buyer\u2019s\ndevice to honestly report that a payment was definitively made puts merchant\u2019s revenue at risk. We present an inexpensive and usable solution for merchants to verify that a buyer correctly completed a payment even when the point of sale is offline.\n\nThe talk will cover the design details and talk about the current implementation using GNU Taler: a free software, privacy focused and online payment which is built with some properties of cash.\nhttps://taler.net/en/\nabout this event: https://pretalx.c3voc.de/camp2023/talk/UH9MYT/