As demand for wireless services intensifies, dynamic spectrum sharing has become a critical challenge for spectrum governance. Byzantine Fault Tolerant (BFT) protocols offer a technically robust approach to decentralized coordination, enabling multiple users to make consistent spectrum access decisions even in the presence of faults, conflicting incentives, or adversarial behavior. Yet, the success of BFT systems depends not only on algorithmic guarantees but also on the institutional environment in which they operate. This paper unfolds the various dimensions of BFT – the organizational dimension, distributed systems, fault models and performance metrics in the context of spectrum sharing. We conceptualize spectrum as a modular bundle of rights and elucidate several BFT-based architectures that vary in how they structure coordination and fault tolerance. We conduct a basic simulation of a two-tier sharing of spectrum slices, and our simulation results highlight trade-offs in sensor deployment and organizational trust. We argue that decentralized spectrum governance structures may enhance the feasibility and legitimacy of BFT-based spectrum sharing as there are strong similarities to polycentricity. BFT thus represents more than a technical solution: it is an institutional testbed for scalable, adaptive, and rule-based spectrum governance.