Cloud computing offers scalable and affordable solutions, revolutionizing data accessibility and storage. However, because of centralized systems and possible weaknesses, security and privacy issues continue to exist. With its decentralized and unchangeable record, blockchain technology presents a viable way to improve cloud security. With an emphasis on access control, data integrity, and privacy, this study investigates how blockchain technology might be incorporated into cloud computing to reduce security threats. We examine current issues and provide a blockchain-based framework for safe and decentralized cloud computing.