# Storage

There are four storage databases forming within the framework:

1. If we take a look at the dMail and dChat as an example, blockchain is used to store:
   * A link to the dMail JSON metadata, timestamp, checksum & sender address,
   * dChat encrypted message, timestamp & sender address.
2. The concept of decentralized storage is used for the temporary or permanent storage of encrypted communication and data files and JSON files (i.e. dMail, subject & content attachment location).
3. Integrators can also opt for more centralised storage such as cloud storage.
4. User local storage is used for storing:
   * wallet private keys,
   * dMail & dChat content hash, and
   * user-initiated backup of conversations, data files and reports.


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