In the social world, the Internet of Things (IoT) can assimilate the physical as well as computational procedures as services. The quantity of administrations at the IoT edge is rising quickly because of the predominant purposes of smart gadgets and cyber-physical systems. One of the difficulties in exploring the encouraging applications of IoT services is making the services interoperable in a decentralized environment. It has been demonstrated that the Blockchain technology (BCT) is a promising option for calling for executions and establishing data trust. It could theoretically be utilized to aid in service interoperability. BCT records a verification of info or a procedure as a operation in a distributed ledger. Like the geography to IoT, considering BCT at the edges of the organization shows the dispersed trademark. Be that as it may, presently, BCT is as yet confronting the moves for interoperability because of various factors, for example, agreement conventions, block sizes, and time frame. The current BC-related security systems for the IoT environment are discussed in this paper. This paper further makes sense of the meaning of the provision of a safeguarded communication architecture for IoT devices utilizing a BC with Software defined network (SDN) empowered network. Further, this paper depicts the significance of the AI/ML driven techniques in tightening the security and confidentiality level of IoT frameworks.