The Department of the Internet of Things is developing very rapidly. We interact with its other fields in our daily life in one way or another way like smart vehicle systems, smart homes, smart medical systems, and more. Here our concern is a smart medical system that stores its data in cloud storage and this kind of storage mechanism causes many critical security vulnerabilities like unauthorized access to private data, data breaches, information theft, and more. So to avoid that kind of security mishap, we proposed a blockchain-based framework that stores information on a distribution instead of a central repository and makes information immutable. So every time a transaction takes place over a network, it is first authenticated. In this way, transactions take place on the network without any miscellaneous data or security threats.