In this paper, we study a about blockchain technology as blockchain is the new trend and has attracted various niches. It has un-hackable security characteristics. Earlier blockchain considered only as crypto-currencies or Bitcoin. But nowadays the versatility of blockchain is emerging. This paper is all about the blockchain technology, its security aspects and the challenges in the blockchain field. There have been so many benefits of blockchain technology in the field of persistency,

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... ization etc. Also, it can benefit different perspectives in the technological arena and application arena. This review helps us to know the basic aspects of blockchain and cyber-security.