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For example you might lookup a user's profile based upon their DID, their Ethereum account, or their Twitter manage; or you might lookup a user's Filecoin account based upon their Polkadot account. We are working with The Chart on indexing these identity structures which will open lots of new opportunities in this world.
If you also require a method of keeping and handling user data, you have 3 main choices. Use the IDX library to directly store documents on the Ceramic Network and add recommendations to those files in the user's index. For This Piece Covers It Well , no additional software is needed; it works out of the box with IDX.Store information in alternative information storage systems such as Filecoin, IPFS, Sia, Arweave, Fabric, Orbit, DB, Secure Data Stores, or Ethereum contracts and utilize IDX to include references to this data in your user's index.
This holds true regardless of where the data resides (servers or decentralized networks) or which application initially created the information. The identity index consists of mappings to different information sources, Share information throughout applications and silos, As described above, the crucial aspect of IDX that de-silos details, promotes interoperability, and makes it possible for user control is the identity index.