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This part of the chapter presents a summarized overview of solutions that have been recently proposed by researchers aimed at maintaining and preserving privacy of the blockchain [1]. In a public blockchain, for example, in the digital currency or crypto currency Decreed, it is adviced and proposed that the clients’ address should have been adjusted and altered by creating another key pair for every session. Except that, there are three frequently-used systems and methods for safety and security and protecting anonymity in the blockchain and they summarized by: mixing services, ring signature, and non-interactive zero-knowledge proof.