With the introduction of the European Union's Digital Markets Act (DMA), an open standard for interoperable communications is needed in the messaging world. Matrix already serves as such a layer, though can be quite complex.

In this talk we explore Matrix's existing interoperability considerations, how Linearized Matrix works and interoperates at the room level, and the interactions with MIMI's latest protocol document work. This talk will be fairly technical as it deals with the algorithms embedded at the individual room level, including event authorization, state resolution, and the associated security properties and models.