Simon Willison’s Weblog

22nd January 2007 - Link Blog

Group Membership Protocol. Martin Atkins’ proposal for a simple “is OpenID X a member of group Y?” protocol, useful for whitelists that can scale to handle large numbers of entries.

Posted 22nd January 2007 at 8:27 am

Recent articles

Battle Drones - a vibe coded RTS with audio-based multiplayer - 20th October 2026
Hello Python 3.15, goodbye 3.10, and now I can use 3.11 - 12th October 2026
A new feature for my blog, built using my voice - 9th October 2026
Claude Haiku 5.5 - 7th October 2026

This is a link post by Simon Willison, posted on 22nd January 2007.

martin-atkins 7 openid 213 whitelisting 7

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe