A Secure and Private Way to Share and Control Data in Multi-Cloud Environments

In today's world, digital transformation is growing rapidly.Organizations are increasingly adopting multi-cloud services from providers such as AWS, Azure, and Google Cloud.They prefer multi-cloud systems to avoid vendor lock-in and to enhance redundancy and resilience so that if one provider fails, the others can continue to operate smoothly.However, integrating multiple cloud services into a single environment remains a significant challenge. Additionally, security risks may arise due to differences in availability zones and data center architectures. To address these issues, this study proposes the use of blockchain technology. It is designed to solve the problem of securely sharing data across different cloud platforms. By applying encryption and smart contracts, the system ensures fine-grained access control. Every action is recorded and can be traced. The main goal is to integrate blockchain with cloud services to enhance trust, security, and transparency in data operations.