Digital cash, just like digital car keys, has to work offline. That is, I need to be able to get into my car and drive off where there is no mobile signal and I need to be able to buy milk if the internet is down or if the power is out at the grocery store. Fortunately, we have the technology and Apple and Google are building with it.
Offline Money, Offline Identity
Any kind of mass market cash replacement or cash augmentation product has to have one particular characteristic: It has to work offline. The Bank for International Settlements (BIS) Innovation Hub Nordic Centre has published a comprehensive handbook exploring key aspects of how central bank digital currencies (CBDCs) could work for offline payments, by which they mean payments made without being connected to the internet, either temporarily or because of coverage limitations. The handbook, produced as part of the BIS Project Polaris in partnership with Consult Hyperion, intends to help central banks considering the potential implementation of CBDCs with offline functionality to take into account a complex matrix of issues including security, privacy, likely risks, the types of solution, their maturity and applicability, and operational factors.
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