A description of known problems in Bluesky PBC's paper, "Bluesky and the AT Protocol: Usable Decentralized Social Media", as well as notes on terminology changes and how Bluesky's implementation differs from that described in the paper.
AT Protocol
The AT Protocol is a protocol and set of open standards for decentralized publishing and distribution of self-authenticating data within the social web. It serves as the technical foundation of the Bluesky social network, originally developed as a reference implementation for the protocol, as well as an ecosystem of interoperable social applications and services collectively referred to as the ATmosphere.
Bluesky Is an App. The AT Protocol Is the Internet Beneath It. - Ewan’s Blog
There is a confusion that keeps recurring, and it is understandable enough that it is worth addressing directly.
Bluesky Is an App. The AT Protocol Is the Internet Beneath It. - Ewan’s Blog
There is a confusion that keeps recurring, and it is understandable enough that it is worth addressing directly.
Starting from scale in the design of the AT Protocol - Paul's Leaflets
Bluesky was founded in 2022 to produce a protocol which Twitter could adopt. The product goals changed, but the requirements didn't.
Where Are The Exits?? · thoughts
What the AT protocol needs from Bluesky PBC now, and why it's not to focus on bsky.app
Beyond Bluesky: These are the apps building social experiences on the AT Protocol | TechCrunch
A list of AT Protocol-based, consumer-facing apps that are either built on top of Bluesky or its underlying protocol, allowing users to take back control over their social networking experiences and personal data.
What I Wish Someone Had Told Me About AT Protocol and Bluesky - Stuff Rob Wrote
I've been interested in atproto (the protocol that Bluesky, Blacksky, and many other applications - including pckt, where this blog is hosted! - run on) for abo...
The AT Protocol's interesting design - LittleBit
Bluesky's backend was made to be more than a social network
Introduction to AT Protocol
Walkthrough of the various parts and concepts in Bluesky's AT Protocol (ATProto), the types of servers involved and how it all fits together
Introduction to AT Protocol
Walkthrough of the various parts and concepts in Bluesky's AT Protocol (ATProto), the types of servers involved and how it all fits together
Bluesky Protocol Services
High scale open social, unlocked for every builder. Bluesky operates public infrastructure for the AT Protocol — Jetstream, Relay, and the Bluesky API — as open services anyone can build on.
Bluesky and the AT Protocol: Usable Decentralized Social Media
Bluesky is a new social network built upon the AT Protocol, a decentralized foundation for public social media. It was launched in private beta in February 2023, and has grown to over 10 million registered users by October 2024. In this paper we introduce the architecture of Bluesky and the AT Protocol, and explain how the technical design of Bluesky is informed by our goals: to enable decentralization by having multiple interoperable providers for every part of the system; to make it easy for users to switch providers; to give users agency over the content they see; and to provide a simple user experience that does not burden users with complexity arising from the system's decentralized nature. The system's openness allows anybody to contribute to content moderation and community management, and we invite the research community to use Bluesky as a dataset and testing ground for new approaches in social media moderation.
Firehose | Bluesky
One of the core primitives of the AT Protocol that underlies Bluesky is the
How It Works | Bluesky Protocol Services
From one post to the whole network — how records, Lexicons, and the firehose fit together on the AT Protocol.
Bluesky
Bookmarks related to Bluesky, including clients and utilities. See also “AT Protocol” and “AT Protocol apps” collections
38 Most Influential Bluesky Posters of 2026
THRONG — a crowd made of bluesky
SkyTrace
Bluesky Firehose
samantha.wiki/fray
Northsky