We are happy to announce the publication on "Practical Offline Payments Using One-Time Passcodes" by The European Money and Finance Forum.
Modern buyers enjoy the convenience of digital payments, but not all points of sale always have an Internet connection. Trusting the buyer’s device to honestly report that a payment was definitively made puts merchant’s 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.