[hda2]

What is the E2EE story for spaces? Besides space names and member lists which I assume are visible to the server like normal rooms, what other information is also visible to the home server? Are rooms/subspaces inside spaces also visible?

[Arathorn]

Spaces are identical to rooms, which means that state events (key value data like name, membership, avatar, etc) are currently not e2ee, but conversation data would be e2ee if there was any. Encrypting human visible payloads for state events is on the roadmap however, but encrypting the metadata would be hard. For that, we are working on P2P Matrix to stop the metadata pooling anywhere.

[eitland]

> For that, we are working on P2P Matrix to stop the metadata pooling anywhere.

For everyone who just glanced through the comment above, this is big and a major selling point compared to most competitors (IMO).

[Arathorn]

It's also early beta, though (although we're committed to getting Matrix hybrid client-server & p2p in the medium/long term). https://matrix.org/blog/2021/05/06/introducing-the-pinecone-... has more on the latest developments on P2P (and public beta builds for iOS & Android) from a few weeks ago :)