In today’s rapidly evolving healthcare landscape, the emergence of cutting-edge technologies like IoT and wearable devices has led to significant advancements, particularly in remote patient monitoring. However, the prevalent client/server architecture used in current implementations poses considerable challenges related to security and privacy, rendering healthcare systems vulnerable to various attacks. Consequently, stringent regulatory and security measures are imperative to safeguard health data. To address these challenges and align with regulatory requirements, transitioning to a distributed architecture becomes imperative. Blockchain, renowned for its distributed nature and security capabilities, emerges as a promising technology to mitigate security risks inherent in IoT-based systems. Motivated by these considerations, this study proposes HealthLink—a secure healthcare framework seamlessly integrating IoT and blockchain technologies. This framework is specifically tailored to facilitate remote patient monitoring, particularly for chronic diseases necessitating continuous oversight. Key considerations encompass security, scalability, and processing efficiency. Security measures entail employing re-encryption proxies in conjunction with blockchain for hash data storage, while access control is managed through smart contracts. To enhance Bbockchain scalability, an off-chain IPFS-based database is utilized for data storage. Additionally, Ethereum blockchain-based proof of authority is leveraged to expedite data storage processes. As a practical demonstration, we apply the HealthLink system to diabetes management, presenting execution results via system interfaces. Experimental findings underscore substantial enhancements in healthcare system security compared to conventional methodologies.