The high rate of the growth of cloud computing has shown concerns of data insecurity, integrity, and transparency in the centralized environment. The current study is a proposal of a cloud architecture that incorporates blockchain to improve secure and transparent data handling by using decentralized verification and cryptography defense. The system uses a combination of the hash function of SHA-256 to verify data integrity, the encryption function of RSA-2048 to ensure secure communication, Practical Byzantine Fault Tolerance (PBFT) to achieve efficiency in the consensus, and authenticated controlled access with the help of smart contracts. Experimental analysis was performed in terms of 10,000 simulated enterprise records in conditions of different workloads. Findings indicate that the presented framework has 100 per cent data integrity detection, 1 per cent lower unauthorized access rates than 8 per cent with traditional cloud systems, and enhances more audit transparency of 98 per cent versus 70 per cent. Even though degradation due to increased transaction latency (290 ms to 360 ms) and slight performance degradation in transaction rate (130 TPS to 115 TPS) were observed under medium load, the security gains and fault tolerance are of much greater importance than the performance overhead. Resilience was tested through the three faulty nodes that had 97% availability in the framework. In general, the paper confirms that blockchain-cloud integration offers a stable yet scalable approach to determining secure and transparent data management with the protection against tampering in the context of distributed computing.