In this paper, we introduce Sark, a reference architecture for transferring unforgeable, stateful, oblivious (USO) assets. We describe the motivation, design, and implementation of the core subsystems of Sark, Porters, which accumulate and roll-up commitments from Clients, and Sloop, a permissioned, crash fault-tolerant (CFT) blockchain system. We analyse the operation of the system using the `CIA Triad': Confidentiality, Availability, and Integrity. We then introduce the concept of \textit{local centrality} and use it to address design trade-offs related to decentralization. Finally, we point to future work on Byzantine fault-tolerance (BFT), and mitigating the local centrality of Porters.
@article{arxiv.2512.20775,
title = {Sark: Oblivious Integrity Without Global State},
author = {Alex Lynham and David Alesch and Ziyi Li and Geoff Goodell},
journal= {arXiv preprint arXiv:2512.20775},
year = {2026}
}