Encrypted algorithm used is a decentralized technique. It has enough power to resolve any business related issues. Cryptography secures the records in a blockchain transaction and each transaction is tied to previous transactions or records. One of blockchain's benefits is its inherent resiliency to cyber-attack. While not immune to all forms of cyber risk, blockchain's unique structure provides cyber security capabilities not present in traditional ledgers and other legacy technologies. The distributed architecture of an algorithm rise, the resiliency of the overall network from being exposed to compromise from a single access point or point of failure. Also improve the overall robustness and integrity of shared ledgers. The Merkle tree structure also help participants with enhanced transparency, making it much more difficult to corrupt blockchains through malware. Blockchains hosted on a cloud platform, cloud data owners prefer to outsource documents in an encrypted form for the secure infrastructure. Also the foundation of Bit coin is using blockchain data structure and now it has received extensive attentions recently. In this survey paper of privacy preserving algorithm author point out the advantages and usage of it through existing approach. Lastly, the author discuss the structure and main features of block chain are like Decentralization, Immutability Faster dealings, Transaction and validation happens in seconds etc. In This Survey paper author has discuss one challenge that the relationship between data will be normally concealed in the process of encryption, which will lead to significant search accuracy performance decrease while the volume of data dramatic high. For such challenges author in this paper will suggest some innovate ideas to get the efficient end product outcomes.