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For instance you might lookup a user's profile based upon their DID, their Ethereum account, or their Twitter handle; or you could lookup a user's Filecoin account based upon their Polkadot account. We are working with The Graph on indexing these identity structures which will open up lots of new chances in this realm.

If you also need a way of storing and handling user data, you have three primary alternatives. Use the IDX library to straight store files on the Ceramic Network and add recommendations to those files in the user's index. For  Keep Checking Back Here , no extra software application is needed; it works out of the box with IDX.Store data in alternative data storage systems such as Filecoin, IPFS, Sia, Arweave, Textile, Orbit, DB, Secure Data Stores, or Ethereum agreements and utilize IDX to include referrals to this information in your user's index.

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This is true regardless of where the information lives (servers or decentralized networks) or which application first produced the data. The identity index consists of mappings to various data sources, Share information across applications and silos, As described above, the crucial aspect of IDX that de-silos info, promotes interoperability, and enables user control is the identity index.