With the increasing adoption of emerging technologies in developing countries, such as smart farming and precision agriculture, the integration of blockchain-based Internet of Things (IoT) systems has gained significant attention. In this study, we propose a fourlayer architecture for designing a blockchain-based IoT system in the domain of smart farming. The architecture comprises device nodes, fog nodes, a cloud server, and end users. Hyperledger Fabric is employed as the underlying blockchain framework, ensuring permissioned access and secure data management. Additionally, we incorporate Role-Based Access Control (RBAC) to further enhance security. Through performance analysis, including measures such as throughput and latency, we evaluate the system’s efficiency and responsiveness. This study explores the benefits of utilizing Hyperledger Fabric and a permissioned blockchain approach in the context of smart farming. It offers valuable insights for stakeholders and farmers who are seeking secure and reliable IoT solutions for agricultural practices, emphasizing improved security and trust in the field of smart farming. Key words: Blockchain, Cloud Computing, Consensus Algorithm, Cryptography Algorithm, Fog Computing.