This podcast from Transport Security International Magazine explores the potential applications of blockchain technology in aviation security. The podcast starts by explaining the fundamentals of blockchain, including its origins as a technology for Bitcoin, its operation as a secure and decentralised ledger, and its different forms, including public and private ledgers. It then examines how blockchain could be applied to improve cargo security by providing a transparent registry for each piece of cargo, thereby increasing the reliability of its origins and screening. Finally, the podcast proposes using blockchain to facilitate a “One Stop Security” system, where passenger and baggage screening data is shared and validated across a network of airports, potentially reducing the need for rescreening and increasing trust between security authorities.