1、A high-level design guide for offline payments with CBDC 1 Project Polaris Part 4:A high-level design guide for offline payments with CBDC October 2023 A high-level design guide for offline payments with CBDC 2 A high-level design guide for offline payments with CBDC 3 Contents Executive summary 4 A

2、cronyms and abbreviations 6 1.Introduction 7 2.The current offline CBDC landscape 9 2.1 Central bank objectives 9 2.2 Current technology landscape and challenges 11 3.Design choices for offline payment solutions 15 3.1 Primary design choices 15 3.2 Secondary design choices 22 3.3 Trade-offs 23 4.App

3、lying the design choices 25 4.1 Motivations 25 4.2 Design options and characteristics of the system 26 4.3 Illustrative scenarios 26 5.Conclusion 30 References 31 Annex A:Example jurisdiction comparison 33 Annex B:Map of offline payments with CBDC 36 Acknowledgements 38 A high-level design guide for

4、 offline payments with CBDC 4 Executive summary The design and implementation of offline payments capabilities for CBDC systems is a complex undertaking.Some challenges and trade-offs cannot be solved easily,despite the work of many central banks and private sector participants.Further,since each ju

5、risdiction has unique requirements,there is no one-size-fits-all solution.The BIS Innovation Hub(BISIH)previously published a handbook for offline payments with CBDC which provides a comprehensive overview of offline payments with CBDC.1 The present guide is for central banks that have used the offl

6、ine handbook to build their knowledge and now want to focus more deeply on their requirements and design choices for offline payments with CBDC.The guide is based on information gathered in a series of deep-dive workshops conducted across May and September 2023 in collaboration with solution vendors