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Wireless Sensor Network (WSN) comprises of cheap and multifunctional resources constrain nodes that communicate at a fair distances through wireless connections. It is open media and underpinned by an application scenario for data collecting and processing. It can be used for many exclusive applications range from military implementation inside the battlefield, environmental tracking, fitness quarter as well as emergency response of surveillance. With its nature and application scenario, protection of WSN had drawn an attention. It is understood that the sensor nodes are valuable to the attacks because of the construction nature of the sensor nodes and distributed network infrastructure. In order to ensure its capability especially in malicious environments, security mechanisms are essential. In this paper, we have discussed the challenges and the viability of the blockchain to implement in the WSN in order to protect WSN from the attacks.