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, 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. The handbook, compiled in partnership with Consult Hyperion (disclosure: although I had nothing to do with this project, I am a Director of Consult Hyperion) addresses these issues as well as objectives for resilience, inclusion, cash resemblance, accessibility and other desired attributes.
At the same time, a survey by Kantar for the European Central Bank (ECB) revealed that Europeans perceived offline payments to be the most innovative digital wallet feature with its use in specific situations, e.g. in areas without internet coverage, when mobile data isn’t available, or when using flight mode.
(Despite this, most participants expected they would not often use offline payments, which tells me is that neither the pollsters nor the public understood what offline payments are for or how they will be used at population scale, but that’s a different point.)