FOSDEM 2026 - Multi-relay chat messaging & cryptographic identities with Delta Chat and Chatmail relays

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Brussels / 31 January & 1 February 2026

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FOSDEM 2026<br>Schedule<br>Events<br>Developer rooms<br>Decentralized Internet and Privacy<br>Multi-relay chat messaging & cryptographic identities with Delta Chat and Chatmail relays

Multi-relay chat messaging & cryptographic identities with Delta Chat and Chatmail relays

Track : Decentralized Internet and Privacy

Room : UD2.218A

Day : Sunday

Start (UTC+1) : 16:30

End (UTC+1) : 16:55

Chat :<br>Join the conversation!

During the past year, Delta Chat has been working on multi-relay chat messaging - you are no longer restricted to one server hosting your identity and transmitting your messages. Instead, the decentralized chatmail relay network transmits your messages, while your identity remains on your devices only, through the cryptographic key.

In this talk we go into the technical details of multi-relay. We show how we migrate the ecosystem to this new approach, and how it can be introduced without taking away the seamless messaging experience from users.

Delta Chat website: https://delta.chat

Chatmail relay documentation: https://chatmail.at/doc/relay/

Speakers

holger krekel

missytake

Links

Video recording subtitle file (VTT)

Video recording (AV1/WebM; preferred) - 77.2 MB

Video recording (MP4; for legacy systems) - 530.7 MB

Chat room(web)

Chat room(app)

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