Overview
ActivityPub is a decentralized social networking protocol recommended by the W3C. While it is the foundation of the 'Fediverse' (e.g., Mastodon), its integration with blockchain technology adds a layer of verifiable ownership and permanent storage for social data.
Key Concepts
- Actors, Activities, and Objects: The core data model for describing social actions (e.g., 'Alice' 'Liked' a 'Post').
- Inboxes and Outboxes: How servers communicate and exchange social updates.
- Blockchain Integration: Using blockchain to store Actor identities (DIDs) or to timestamp and anchor social activities for immutability.
Significance
Combining ActivityPub with blockchain creates a bridge between the existing decentralized web (Fediverse) and the emerging Web3 social ecosystem.