Abstract
There has been expanding enthusiasm for embracing Block Chain (BC) that supports the digital money
Bitcoin, in Internet of things (IoT) for security and protection. In any case, BCs are computationally costly
and include high transfer speed overhead and postponements, which are not reasonable for most IoT
gadgets. This paper reviews what has been done by researchers in integrating the block chain with IOT for
safety and privacy. High asset devices make an overlay system to execute a freely open disseminated BC
that guarantees start to finish security and protection
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