<p>In the Internet of Things (IoT) security, traditional access control methods are increasingly insufficient to address the complexities and scalability challenges posed by vast networks of interconnected devices. This paper introduces an advanced IoT system for access control that leverages blockchain methodology and a message queuing system to enhance security, clarity, and efficiency. The suggested framework integrates blockchain to provide a decentralized and unchangeable record keeper for access control transactions, ensuring that access rights and logs are absolute. In line with this, we employ a message queuing system to facilitate real-time communication and coordination among IoT gadgets, access control nodes, and users. This combination allows for secure, scalable, and efficient management of access requests and permissions across a dynamic IoT environment. This paper details the design of the system, the integration of blockchain, and message queuing components and evaluates the system’s performance through a sequence of modeling and real-world scenarios. The outcome shows significant improvements in security, transparency, and operational efficiency compared to conventional access control mechanisms. This innovative approach paves the way for more robust and reliable IoT access control solutions, addressing key challenges in modern IoT deployments like scalability.</p>