







I just finished a progress report / summary of the arbiter server that we've been working on at @roomy.space. The goal is to have an interoperable standard for group membership management on top of the ATProto permissioned space proposal. The last couple weeks were full of progress & discussion!
Arbiter Progress Report 1 - Zicklag's Leaflets
zicklag.leaflet.pubMay 13, 2026 at 6:55 PM
The Arbiter - Group Management for Permissioned Spaces and Beyond - Zicklag's Leaflets
The permissioned data proposal has the concept of membership, but leaves it to the app to orchestrate it. The arbiter is our idea for a general-purpose, interoperable ATProto group membership service.
Arbiter Progress Report 1 - Zicklag's Leaflets
Lots of implementation progress & lots of discussion with the community.
Live Call: Communities & Permissioned Data for Roomy.space
Roomy and community organizing for system change
Roomy is a group messaging app that gives online communities tools for autonomous collaboration — designable spaces not just for chat, but for cultivating a web of shared understanding together. We show how cheap, user-controlled, interoperable data on ATProto can enable online communities to channel impassioned mobilizing into sustained organizing in the shadow of Big Tech's empire.

The Atproto Spaces Alpha is Live - AT Protocol
Atproto Spaces, formerly known as “the permissioned data protocol,” is a new extension to atproto that enables non-public data. The alpha is now officially open. Here’s how to develop with it and what to expect as we work towards the full release.

The Atproto Spaces Alpha is Live - AT Protocol
Atproto Spaces, formerly known as “the permissioned data protocol,” is a new extension to atproto that enables non-public data. The alpha is now officially open. Here’s how to develop with it and what to expect as we work towards the full release.

At @roomy.space we've been cooking up the design for the next, ATProto-native iteration of Roomy, and that includes private data on protocol! The first component that we're working on is a group membership service that we're calling the "arbiter". Here's full overview of the design so far!
The Arbiter - Group Management for Permissioned Spaces and Beyond
zicklag.leaflet.pubI have just finished an interactive arbiter simulator that runs right in the browser! The arbiter is our attempt at an interoperable group management system for the ATProtocol and permissioned spaces. zicklag.github.io/leaf-0.4/arbiter-simulator/
Another arbiter progress report! An attempt at a goups standard for ATProto. This week we talked to @habitat.network and it got us thinking about how we could inter-op, even with other projects that can't use the arbiter. Now we've got a draft lexicon that I'm hoping can work for both of us.
Arbiter Progress Report 2 - Zicklag's Leaflets
zicklag.leaflet.pubI've just finished the first, barely-working prototype of our new arbiter server! It's not ready for use just yet, but we're going to start experimenting with it in @roomy.space as a way to make every space a fully-fledged ATProto account that can be seamlessly managed by the Roomy space's admins.
Arbiter Progress Report 3
zicklag.leaflet.pubHey, I opened a proposal to create a working group for games on atproto! I'm want to make the work that I and others have already done more useful for applications across the ATmosphere. If you're interested in co-chairing, helping out, or just participating, let me know! #atproto #gamedev
[Proposal] WG for Games
discourse.atmosphere.communityreminder that the inaugural ATP (atproto) working group meeting will be taking place soon! we are scheduled for the Thursday of #IETF126. you can register and participate remotely. if you have a topic you want to discuss, reply to the chairs on the mailing list; this is roughly final call
Internet Engineering Task Force
The FINAL AGENDA for the #IETF126 Vienna meeting hosted by @cisco.com has been published! It includes 100+ working sessions, an #IETFHackathon, and more planned for 18-24 July. Register today to participate with 1000+ Internet technologists from around the world: ietf.org/meeting/126/