Wireless Sensor Networks are important parts of Internet of Things, which are used to collect information from speci?c areas. A WSN is a self-organizing network built by a large number of cheap, limited energy, weak computing and low storage capacity sensor nodes. The blockchain technology is utilized to solve the limitations of sensor nodes and enhances the performance of WSNs. This paper reviews the most recent proposed approaches of employing blockchain in WSNs and their research outcomes. Most of the previous studies focus on improving the security, reliability, data storage, and node recovery and energy efficiency of WSNs. This is the first paper that highlights this subject and discusses all the related works. This review can be used as a basis for researchers who are interested in employing blockchain technology in WSNs.
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