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Abstract
A blockchain acts as public transaction that can be accessed by each and everyone but there is no any central authority having control on blockchain. It enables the various sophisticated technology for professionals as well as for companies to collaborate with trust and transparency. There are various applications that are related with blockchain but the best known applications of blockchains are the cryptographic currencies such as Bitcoin, but many other applications are also possible. Blockchain technology is examined as driving force of the next fundamental revolution in information technology. In this paper blockchain approach related centralized to Decentralized database is discussed.