Blockchain-Based Data Integrity Framework for Secure Cloud Storage Systems

Abstract

The use of cloud storage has made people more worried about the accuracy of data partly because it is managed centrally, threats from inside the company take place more easily and cyberattacks happen more often. This work describes a decentralized way to ensure data integrity by using blockchain, smart contracts and the InterPlanetary File System (IPFS). The cryptographic hashes are secured on a permissionless blockchain, making the proofs unchangeable and smart contracts handle access and make auditing happen in real time without showing the private data. With IPFS you can handle off-chain storage smoothly which improves how fast and robust the system can be. A trial deployment on the Ethereum testnet showed an accuracy rate of 99.8% in catching unauthorized changes without taking much time or effort. Integrity assurance, the ability to audit all transactions and multi-user scalability are superior to other techniques. Therefore, the system works best in areas like finance, healthcare and government institutions. Thanks to its transparency and elimination of centralized trust, this work helps form reliable and scalable cloud storage systems.