As the integration of the Internet of Things (IoT) devices in healthcare becomes more prevalent, ensuring the security and integrity of health data is paramount. Existing systems often lack transparency, with data siloed within institutions and vulnerable to tampering. Additionally, the centralized management model in healthcare networks can obscure accountability, hindering the identification of root causes in case of data breaches or quality issues. The emergence of blockchain technology offers a promising avenue to address these challenges, leveraging its decentralized, transparent, and immutable characteristics. In this chapter, a proposed a blockchain-based system for securing IoT health data, where all data transactions are recorded in a distributed ledger using Smart Contracts. This creates an auditable trail, enabling traceability and accountability throughout the data lifecycle. The design outlines an event response mechanism to authenticate data exchanges, ensuring the validity and integrity of transactions. All events are logged permanently, serving as a basis for resolving disputes and tracking responsible entities. The chapter discusses the development of a comprehensive solution that integrates blockchain technology with IoT healthcare data management. Key challenges are addressed including data transparency, integrity, and accountability in healthcare systems. Additionally, a practical implementation framework is outlined using the Truffle testing framework, deploying contract code on a test network and implementing a decentralized web interface. Through rigorous security analysis and experimentation, the chapter demonstrates the feasibility and efficacy of a proposed solution in safeguarding IoT health data and enhancing overall data security in healthcare settings.