In 2016, the Office of International Nuclear Safeguards at the National Nuclear Security Administration (NNSA) within the Department of Energy (DOE) commissioned the Pacific Northwest National Laboratory (PNNL) to begin an exploration of the potential benefits of blockchain technology, or more broadly, distributed ledger technology (DLT), for international nuclear safeguards. That exploration produced two conceptual studies'" that served as a basis for technical work performed in 2019. The first established a methodology for determining whether specific safeguards use cases might benefit from the technology, and the follow-on study applied the methodology to six safeguards use cases and identified transit matching as a promising use case for DLT. Based on that work, PNNL designed and developed a prototype ledger for transit matching data and workflows. This paper describes this work to demonstrate DLT in a nuclear safeguards application. We outline the nuclear safeguards problem used, the team's reasoning for selecting the problem, and the team's design choices. Lastly, this document introduces the resulting product, including screenshots of the demonstration, key findings, and recommendations for future research and deployment of the technology for safeguards purposes.
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