Access control of IoT devices based on smart contracts and double-layer channels

Blockchain technology has shown promise in addressing transparency, traceability, and accountability issues in the agrifood supply chain. However, the pursuit of transparency raises privacy concerns, and the integration of IoT devices brings about challenges in terms of performance, mobility, and data volume. We introduce a two-layer architecture for access control, specifically tailored to the attributes of IoT devices. The proposed architecture consists of individual blockchain channels for each Edge Cluster, along with a centralized superior channel responsible for storing contracts. Within each Edge Cluster, a master-slave relationship is established between the edge server and IoT devices.