Cloud computing has revolutionized the way organizations and individuals store, process, and manage data by offering scalable and cost-effective solutions over the internet. However, despite its widespread adoption, cloud computing faces critical challenges related to data security, privacy, trust, and centralized control. Centralized cloud architectures are highly susceptible to cyber-attacks, unauthorized access, and data breaches, which can compromise sensitive information. To address these issues, this project proposes a blockchain-integrated cloud system called Cloud Chain, which leverages Ethereum blockchain technology to enhance security and trust in cloud environments.The proposed system utilizes smart contracts to automate access control and ensure secure data transactions. Blockchain provides an immutable and decentralized ledger, making it nearly impossible to alter stored data without detection. This system enables secure file storage, transparent data access, and efficient verification mechanisms. By integrating blockchain with cloud computing, the project enhances data integrity, reduces dependency on centralized authorities, and improves overall system reliability. The experimental results demonstrate that the proposed system provides a more secure and scalable solution compared to traditional cloud systems.