An open-source implementation of the Messaging Layer Security (MLS) protocol.
What is Messaging Layer Security (MLS)?
Messaging Layer Security (MLS) is an IETF working group building a modern, efficient, secure group messaging protocol.
ATSMS — end-to-end encrypted group messaging
Encrypted group messaging on AT Protocol identities, with no server ordering anything.
ATProto for distributed systems engineers - AT Protocol
AT Protocol is the tech developed at Bluesky for open social networking. In this article we're going to explore AT Proto from the perspective of distributed backend engineering.
ATOM: AT Protocol Over MoQ Transport
This document specifies how the Authenticated Transfer (AT) Protocol can leverage Media over QUIC Transport (MOQT) for efficient data synchronization across decentralized social networks. The AT Protocol's firehose event stream and repository synchronization mechanisms map naturally to MOQT's publish/subscribe model, enabling scalable relay infrastructure, priority-based delivery, and improved resilience for large-scale social data distribution. This specification addresses the challenges of the current WebSocket- based transport and demonstrates how MOQT's relay architecture, group-based caching, and multiplexed streams provide significant benefits for AT Protocol deployments at scale.
ATProtocol Attestations: Cryptographic Signatures for the Decentralized Web - Nick's Blog
This post introduces the formal ATProtocol attestation specification, a framework for adding cryptographic signatures to ATProto records through two complementary patterns: inline attestations that embed signatures directly in records, and remote attestations that store proof in separate repository records. The specification prevents replay attacks through repository binding, uses CID-based content addressing for integrity, and provides the cryptographic foundation for verified credentials, trusted content, and authenticated interactions in the decentralized ATProtocol ecosystem.
Email explained from first principles
Modern email is a patchwork of protocols and extensions. Here is one article to understand them all.
Running a PDS for Your App: How OpenMeet Operates Its AT Protocol Integration
The free, open-source alternative to Meetup. Create groups and events for your community — no fees, no ads, community-owned forever.
Skyreader: A RSS Reader on the AT Protocol
Introducing a RSS reader for the AT Protocol where you feeds and article sharing are portable
From ZK-first to AT Protocol — our path to DDS | Agora Citizen Network
We've been building Agora — a platform for public deliberation using Polis-style clustering — for a while now. Along the way, we've written about what we think about Nostr, AT Protocol, Polis, Community Notes, and protocol interoperability. Those posts are somewhat outdated now. This one describes w...
Permissioned Data Diary 2: Buckets - Daniel's Leaflets
The second in a series of posts building up a solution to permissioned data on atproto. We introduce buckets: a new protocol primitive for creating a shared social context.
Pony
An open-source, object-oriented, actor-model, capabilities-secure, high-performance programming language.