







The AT Protocol (Authenticated Transfer Protocol, or atproto) is a standard for public conversation and an open-source framework for building social apps.
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

Understanding Atproto - AT Protocol Docs - AT Protocol
Dive deeper into the concepts behind the AT Protocol.

Why a New Protocol? The History and Future of AT Protocol - AT Protocol
Bluesky CTO Paul Frazee and Head of Protocol Daniel Holmgren join for a wide-ranging conversation about what atproto is, why it exists, how it got built, and where it's going next. From a Twitter consultancy to an IETF working group, this is where to get started.

FediForum Talk: Atproto: A Technical Introduction
By Daniel Holmgren, head of protocol at Bluesky PBC. AT Protocol (atproto) is the open protocol powering Bluesky and the emerging Atmosphere. This talk gives a high-level overview of atproto's app...
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...

aTIProto — ATProto-native Payments
aTIProto is an ATProto-native payments protocol. Build payments, subscriptions, and pay-what-you-want experiences on the Bluesky network.
OAuth for AT Protocol | Bluesky
We are very happy to release the initial specification of OAuth for AT Protocol! This is expected to be the primary authentication and authorization system between atproto client apps and PDS instances going forward, replacing the current flow using App Passwords and createSession over time.

ATPROTO isn’t just for Bluesky weiners
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.
Atproto Ethos - AT Protocol
A deep dive into the philosophical and aesthetic principles underlying the design of AT Protocol.


I wrote up my talk at @localfirstconf.com as a blogpost The AT Protocol is a high-scale network by design. It works by codifying proven architectures into a protocol. If you've ever used kafka to connect some backend services, then you basically know how atproto works.
Starting from scale in the design of the AT Protocol
pfrazee.leaflet.pub
Bluesky handle directory – PDSes
arroba — arroba 3.0 documentation
What is the Atmosphere? - Leaflet Lab Notes
PDS Sync
Atmospheric Login Page
Certified Account Consolidation
Compose | Taproot
Compose | Taproot

ATScience Ecosystem Map

Bluesky Protocol Services

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AnyPub
ATLoop
Zeens — Photography, undiluted.
A Markdown Editor on AT Protocol — Diffdown

atmoBB Forums
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