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Data deletion - BiblioGenius

Last updated: 27 May 2026

BiblioGenius is a personal library management app developed by Federico CALO. This page explains how to request the deletion of data associated with your installation and with your profile on the optional directory server hub.bibliogenius.org.

1. Data stored locally on your device

All your library data (books, loans, contacts, preferences, cryptographic identity) is stored locally on your device in protected storage (SQLite, Keychain/Keystore).

Procedure: uninstalling BiblioGenius from your device immediately and permanently removes all of this local data. No action is required from us.

2. Data stored on the directory server (hub)

If you used any network feature (public directory, following other libraries, sending/receiving borrow requests), a profile was created on our directory server. This profile contains:

• a pseudonymous cryptographic identifier (public key, does not reveal your identity);
• the name you gave to your library;
• optionally your country and city (if you opted in to share them);
• the list of ISBN/titles in your catalog (only if your library is publicly listed);
• end-to-end encrypted messages in transit through your inbox (the server cannot read them);
• a hashed hardware identifier (device model, hashed Android device ID) used solely to deduplicate profiles after reinstall.

3. How to request deletion of your hub profile

To let us identify your profile, please include in the message:

• the name of your library as displayed in the app, or
• your profile's public identifier (the first 8 characters of the node ID, visible in the "Profile" screen of the app if network features are enabled).

Processing time: your request will be processed within a maximum of 30 days from the receipt of your message. You will receive an email confirmation once the deletion is effective.

4. Data deleted vs retained

Deleted immediately

• Hub profile (library_profiles row), name, identifiers, country, city, etc.;
• Any published ISBN catalog;
• Inbox and associated encrypted messages;
• Follow relationships (followers / following);
• Pending borrow requests involving your profile.

Retained temporarily after deletion

• Anonymized event logs (hub_events) used for maintenance and security , automatically deleted after 30 days.
• Registration failure logs (registration_failures) used for abuse detection, automatically deleted after 90 days.
• None of this data can be traced back to your identity.

Data that never left your device

Local backups of your library, your private cryptographic key, your personal loans, contacts and preferences are stored only on your device. To erase them, uninstall the app (see section 1).

5. Automatic deletion for inactive profiles

Profiles dormant for more than 7 days, with no published books, no inbox and no follow relationships, are automatically eligible for periodic purge by our team. This purge does not apply to active profiles.

6. Contact

For any question about this procedure, contact Federico CALO: contact@bibliogenius.org.