@crepererum @stillgreenmoss @ben @besendorf OpenMLS is an almost decade- long effort with the IETF work starting in 2018. We have studied it and are following developments but one known big issue is its dependency on "total message ordering" which can not be easily obtained in federated settings. Several people, including Matrix folks, have tried to remedy it but we do not know of any practical solution to make OpenMLS work reasonably well for non-centralised settings.