The Internet of Things (IoT) is a network made up of a variety of intelligent devices and cutting-edge technologies that connect to the Internet to exchange data. Consumer, commercial, industrial, infrastructure, and military spaces use IoT significantly. Security considerations like identity veracity and data privacy are becoming more and more important as IoT applications proliferate. Security precautions for IoT applications and communication include authentication and sharing of private data. Blockchain is the current technology that facilitates effective authentication and safe data sharing. Moreover, if we introduce semantic web in blockchain, it will be beneficial in linking the data on web and maintaining the records. The analysis is upheld with respect to the number of verification stages, when a user requests data then, the computational time to validate 50 requests sent by the user is found to be around 86.44 s and the memory usage of the concerned users is 97.36 kb, whereas the attained detection rate and the attained privacy ratio are 73.56% and 70.60, respectively.