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Decentralized Contact Manager

Use Case: Decentralized Peer-to-Peer Contacts Management with Mycelium​

Managing contacts traditionally relies on centralized services like Google Contacts or iCloud, which store user data on proprietary servers, exposing personal information to tracking, surveillance, and potential data breaches.

Mycelium introduces a fully decentralized, peer-to-peer (P2P) contact management system based on CardDAV, allowing users to store, sync, and share contacts securely without third-party control.

Why This Is a Big Deal​

  1. True Data Ownership: Users fully control their contact lists, eliminating dependence on centralized providers that may monetize or analyze personal data.
  2. Peer-to-Peer Syncing: Contact information is securely synchronized between devices and shared with selected users without relying on a central server.
  3. Privacy & Security: All contact data is end-to-end encrypted, ensuring that only authorized users can access or modify entries.
  4. Resilient & Always Available: Contact lists are stored across a decentralized network, preventing data loss due to server failures or service shutdowns.
  5. Interoperable with Existing Apps: Works seamlessly with any application that supports CardDAV, including Apple Contacts, Thunderbird, and many mobile apps.

How It Works​

  • CardDAV-Based Contact Management: Users can create, update, and organize contacts in a decentralized address book.
  • Secure Peer-to-Peer Syncing: Contacts are encrypted and synchronized across user devices or shared selectively with trusted contacts.
  • Access Control & Permissions: Users can share specific contacts or groups with family, colleagues, or business partners without exposing their full address book.
  • Decentralized Name Resolution: Mycelium’s integrated naming system allows users to reference and update contacts in a secure, trustless manner.

Example Use Case: A Privacy-Focused Business Network​

Scenario: A Decentralized Company Wants Secure Contact Sharing​

Emma runs a privacy-focused startup where team members need to access and update shared contacts for partners, clients, and collaborators—but without relying on Google or Microsoft services.

How Mycelium’s P2P Contacts Help:​

  1. Shared but Private Contact Management: The team maintains a decentralized contact book, where only authorized members can access and update entries.
  2. Automatic Syncing Across Devices: Employees can view and edit contacts across all their devices without sending data to a central provider.
  3. Privacy-First Business Networking: Contacts remain encrypted and cannot be accessed or monetized by third parties.
  4. Resilient & Portable: Even if a team member’s device goes offline, the contacts remain available and can be restored from the decentralized network.

Expanding the Network​

Every user who adopts Mycelium’s CardDAV-based contact management contributes to a more decentralized, privacy-preserving digital ecosystem. Businesses, individuals, and organizations can maintain their contacts securely, ensuring they remain in control of their personal and professional relationships.