The protocol begind BlueSky lets you store data in a decentralized way. You can even build a web application on top of it.

marmelab

ATProtocol, the open protocol behind Bluesky, enables decentralized data storage and identity management that developers can build applications on. The protocol uses DIDs (Distributed IDs) for identity, repositories for data storage, Personal Data Servers (PDS) for hosting, and relays with firehose streams for data discovery. A practical demonstration shows how to build a trading card game using Next.js and the @atproto/api library, covering authentication with JWT tokens, creating custom collections, uploading images as blobs, and reading records from repositories. The implementation proves straightforward, requiring minimal code to create custom data structures without complex schemas or approval processes.

Coding a trading card game on ATProtocol

Authentication Mechanism with @atproto/api