IoT and block chain technologies are rapidly growing fields with great disruptive potential in a variety of industries. The former consists of networked devices that collect, share, and utilize data, whilst the latter consists of decentralized, transparent, and secure ledgers that record transactions. The integration of IoT with block chain allows for the resolution of challenges such as security, secrecy, and capacity. This study investigates the integration of IoT and block chain technologies, with a focus on secure data management. The article begins with an introduction to the Internet of Things (IoT) and Blockchain, as well as their properties and uses. It then analyses the benefits and drawbacks of combining the two technologies, demonstrating their potential in a range of industries. It then investigates the advantages and disadvantages of merging the two technologies, showing their potential in a variety of businesses. The study goes on to examine the topic of secure data management, which is a key concern in the industry.