ATProtocol: The Future of Social
Explore the Authenticated Transfer Protocol powering Bluesky and the next generation of decentralized social experiences. With 32+ million users and scaling toward 100+ million, ATProtocol is built for the future. Join us on April 24, 2025 to dive deep into the protocol.
ATProtocol Architecture
The Authenticated Transfer Protocol is built on a foundation of cryptographically-verified data and portable identity that enables a new generation of social applications.
PDS Architecture
Personal Data Servers that give users control over their social data
Multi-Org Operation
Designed for multiple organizations to operate interoperable services at scale
DIDs & Cryptography
Decentralized identifiers and cryptographic verification for secure identity
Custom Feeds
Algorithmic feed infrastructure that enables user choice and innovation
Why You Should Care
Even if you're not already invested in Bluesky or ATProtocol, here's why AHOY! matters to you when it comes to building social apps.
Content-Addressed Data
Explore how ATProtocol uses cryptographic hashing to create verifiable, portable content
Portable Identity
Learn how DIDs enable users to maintain their identity across services and providers
OAuth & Authentication
Robust OAuth implementation enabling secure third-party access while preserving user control
Security & Privacy
Discover ATProtocol's approach to security, privacy, and user data sovereignty
Algorithmic Choice
See how ATProtocol enables third-party feed algorithms that put users in control
Governance Models
Learn about ATProtocol's approach to protocol governance and evolution
Meet Our Speakers
Connect with the pioneers who are building and shaping apps & tools on top of the ATProtocol
More Protocol Speakers Coming Soon!
We're assembling a lineup of technical experts and open web pioneers
Atmosphere Conference Insights
Get a deeper understanding of ATProtocol and its ecosystem from these talks at the recent Atmosphere conference in Seattle.
Where did we come from where will we go
Paul Frazee, CTO of Bluesky, sets the context where we are today with ATProtocol and what the future might look like.
Jay Graber Remarks
Jay Graber, CEO of Bluesky, sets the stage for the Atmosphere Conference.
Beyond Horseless Carriages: Building Communities for the Decentralized Era
Rudy Fraser, founder of the Blacksky, discusses the importance of building communities and interesting things in general.
These videos provide insights into ATProtocol's design philosophy and technical implementation.
Watch More Atmosphere Conf VideosThe Protocol
ATProtocol is constantly evolving through collaborative development and real-world implementation in Bluesky and other applications.
Closed Social Platforms
Proprietary systems controlled by single entities with limited innovation and data portability
ATProtocol & Bluesky
User-centric architecture with data portability, algorithmic choice, and extensible schemas
Key Features
Personal Data Servers
User-controlled data storage with cryptographic verification
Lexicon Schema System
Extensible data schemas for social applications
Decentralized Identity
Portable user identity using DIDs and handles
Custom Feed Algorithms
User-selectable algorithmic feeds
Scaleable
Serving 33+ million users designed for large scale
Content Moderation APIs
Tools for distributed content moderation across the network
OAuth Integration
Secure third-party access while preserving user control
Developer Ecosystem
Rich toolkit for building independent apps on the protocol
Ready to Join Us?
Be part of shaping the future of the European social web. Connect with fellow developers, learn new skills, and make an impact.
Join fellow people from all over Europe
Here's the current map of participants:
