fwiw https://github.com/matrix-org/matrix-spec-proposals/blob/fayed/cryptographic-membership/proposals/3917-cryptographic-membership.md https://github.com/matri

fwiw https://github.com/matrix-org/matrix-spec-proposals/blob/fayed/cryptographic-membership/proposals/3917-cryptographic-membership.md https://github.com/matrix-org/matrix-spec-proposals/blob/fay... is the ongoing work to solve the problem of server-controlled group membership. unfortunately it’s not a trivial problem in a decentralised network (which is why we punted it so far), but it’s starting to shape up.