The kind of app you want to collab with :Check:

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> I really want to get rid of that layer and go direct; device to device. No need for those protocols and the complexity they add if there's no middle man touching your sh!t. perhaps nostr can be used as a signaling layer to establish p2p connections with something like WebRTC? it already is used for making video/audio calls but can be used to transmit arbitrary data.

Correct. There is a relay (some server someone owns) that is touching your data, necessitating the use of e2ee. I am talking about putting that server on the device such that there is no middle man. See Briar Chat

'Unlike traditional messaging apps, Briar doesn’t rely on a central server – messages are synchronized directly between the users’ devices. If the Internet’s down, Briar can sync via Bluetooth, Wi-Fi or memory cards, keeping the information flowing in a crisis. If the Internet’s up, Briar can sync via the Tor network, protecting users and their relationships from surveillance.' Briar is great, but it requires both parties to be online at the same time to chat.