ABSTRACT
The blockchain is a single stage that mitigates the dependence on an only, centralized authority, yet still backings secure and pseudo-mysterious transactions and agreements between cooperating parties. It offers decentralization, unchanging infrastructure, and agreement through cryptography. Blockchain advances could maybe be the silver projectile required by the IoT business. Millions of IoT devices can make use of the blockchain technology in exchanging and coordinating information among nodes in the network. The reason is to support single point of failure. The public-key framework based verification convention gives fundamental security administrations to the Internet of Things (IoT). In any case, trust and privacy are as yet open issues because of the remarkable qualities of IoT. It is critical to keep inside sensor hubs from broadcasting produced messages while all the while safeguarding the secrecy of hubs against the following assaults. In this chapter, we made an in-depth study on different blockchain-based privacy models (BPMs) for IoT. The public keys are utilized as aliases correspondences with no data about genuine personalities for contingent secrecy. To keep the dispersion of forged messages, a notoriety assessment calculation is displayed depending on both direct recorded associations and roundabout conclusions about IoT devices. A lot of experiment is conducted to assess the model as far as security, privacy, and authentication in building up a BPM model. It can help in building up a privacy display with transparency.
