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Nowadays, Large Amount Of Data Is Stored On The Cloud Which Is Required To Be Protected From The Unauthorized Users. To Maintain The Privacy And Security Of Data Various Algorithms Are Used. The Objective Of Every System Is To Achieve Confidentiality, Integrity, Availability (CIA). However, The Existing Centralized Cloud Storage Lacks To Provide These CIA Properties. So, To Enhance The Security Of Data And Storing Techniques, Decentralized Cloud Storage Is Used Along With Blockchain Technology. It Effectively Helps To Protect Data From Tampering Or Deleting A Part Of Data. The Data Stored In Blockchain Is Linked To Each Other By A Chain Of Blocks. Each Block Has Its Hash Value, Which Is Stored In Next Block. Thus It Reduces The Chances Of Data Altering. For This Purpose, SHA-512 Hashing Algorithm Is Used. Hashing Algorithm Is Used In Many Aspects, Where The Security Of Data Is Required Such As Message Digest, Password Verification, Digital Certificates And In Blockchain. By The Combination Of These Methods And Algorithms, Data Becomes More Secure And Reliable. However, With The Help Of Various Algorithms, The Security Of The Data Can Be Enhanced. Also, Advance Encryption Standard (AES) Is Used To Encrypt And Decrypt The Data Due To The Significant Features Of This Algorithm.