We are in the mid of one of the most significant revolutions in the cloud and identity ecosystem since the last decade. With the dynamic transformation from Web2.0 to Web3.0, both the cloud as well as the identity ecosystem embrace themselves for a change in the way we perceived security. Blockchain is revolutionizing both the cloud industry as well as the financial sectors. In my talk, I will focus on the transformative impact of blockchain protocols like Filecoin and Storj which are playing a significant role in changing the way we have perceived cloud storage. Decentralized Cloud Storage will be the future for sustainable data storage in Web 3.0, in which we will move from a single service provider to create an ecosystem where anybody could be a cloud storage provider. Highly successful blockchain projects like Filecoin have been able to create such an ecosystem. But we are far away from attending the level of scale needed to reach out to every corner of the globe. Decentralized Cloud Storage poses a different set of security challenges and scalability issues. I will be presenting my research work which focuses on the new advances in tackling future security threats for decentralized cloud storage. Additionally, I will focus on discussing how to overcome scalability issues in the blockchain using the most advanced cryptographical tools knowns as zk-SNARKs.