The Internet of Things (IoT) enables the capturing and storage of detailed information about individuals, their behaviors, and their living environments. The disclosure of this information can compromise people's right to privacy. Hence, it is essential to use and protect users' data responsibly, which they provide while using IoT-based apps, to ensure their private information and data safety. Our objective is to make it simpler for users to claim ownership of their data, distribute it, and audit it. We propose a blockchain architecture that secures data collected from IoT devices throughout their entire existence. To comply with privacy regulations and meet the needs and desires of end-users (data owners), we will incorporate smart contracts into our framework. A comprehensive breakdown of the system architecture, highlighting its key components and functions concerning a specific application scenario, can help us achieve our goal.