That's .well-known based delegation, which was proposed in MSC1708 in Nov 2017: https://github.com/matrix-org/matrix-spec-proposals/blob/old_master/proposals/17

That's .well-known based delegation, which was proposed in MSC1708 in Nov 2017: https://github.com/matrix-org/matrix-spec-proposals/blob/old_master/proposals/1708-well-known-for-federation.md https://github.com/matrix-org/matrix-spec-proposals/blob/old... and merged into the spec in Jan 2019 (prior to Matrix 1.0 in June 2019): https://github.com/matrix-org/matrix-spec/commit/0347e873efca4f80460492bdff9271601c7bc341 https://github.com/matrix-org/matrix-spec/commit/0347e873efc... So yes, fully-baked and part of Matrix since 1.0! Next Gen Auth via OIDC is instead a key part of the (upcoming) Matrix 2.0 spec release - see https://areweoidcyet.com https://areweoidcyet.com and https://github.com/matrix-org/matrix-spec-proposals/pull/3861 https://github.com/matrix-org/matrix-spec-proposals/pull/386...