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xi Abbreviations ACRP Airport Cooperative Research Program AI artificial intelligence CaaS consensus-as-a-service CBP U.S. Customs and Border Protection DAO decentralized autonomous organizations DID decentralized identity DTC Digital Travel Credential GBA Government Blockchain Association GDPR General Data Protection Regulation HIPAA Health Insurance Portability and Accountability Act IATA International Air Transport Association ICAO International Civil Aviation Organization IoT Internet of Things QR quick response SSID self-sovereign identification W3C World Wide Web Consortium ZKP zero-knowledge proof