ColdStack is a Decentralized Cloud Storage Aggregator that provides a single entry point to Decentralized Clouds such as Filecoin, SIA, Arweave and Storj with unified API and billing. This eliminates the need for our clients to deal with different APIs and different Clouds. They can reuse existing tools or SDK clients designed for the Amazon Simple Cloud Storage (S3) API, which becomes the de-facto standard for the data storage industry. They also can combine multiple Decentralized Clouds in one dApp. ColdStack can create NFTs (non-fungible tokens) for any file stored in the system. Token format is 100% compatible with major NFT marketplaces like Super Rare or Open Sea, so all the stored files can be immediately offered for sale there. In short, ColdStack is an AI-based infrastructure project based on Polkadot blockchain, which allows to unleash the power of Decentralized Clouds for the projects within the crypto space and beyond.