<p>This article focuses on the application of blockchain technology to the security of IoT devices for data transmission. It first addresses the importance of security in the IoT environment and discusses the challenges faced by IoT devices in terms of security, followed by an overview of blockchain technology and its main features, including its ability to ensure data integrity and immutability. It describes how blockchain technology can address IoT security challenges, including protection against infiltration attacks, prevention of data manipulation, and identity and access management, and discusses practical applications of blockchain technology in IoT security, such as creating secure sensor networks and protecting the privacy of IoT data.</p>
<p>Throughout the development of the project, accurate information about the presence of students in classrooms will be collected by implementing an attendance tracking system based on IoT devices, each attendance record will be transformed into a transaction on the blockchain, and this data will be securely transmitted via a blockchain network, all using consensus algorithms.</p>
<p>The potential of blockchain technology to improve the security of IoT devices and data transmission in this environment will be demonstrated. The combination of blockchain technology and IoT devices can provide a more robust and reliable security solution for the growing number of networked devices around the world.</p>