In: software, technology, decentralized.
Also: chat.

Nostr

Nostr (acronym for Notes and Other Stuff Transmitted by Relays) is an open protocol for decentralized message transmission, with the intention to be able to resist internet censorship while maintaining session integrity.
"Noster" can also be translated as "our" or "ours" from Latin.
The protocol achieves decentralization through users publishing content associated with a cryptographic public key to various "relays", which are WebSocket servers that store and distribute an activity stream of received data from users. This allows the network to verify users and achieve account portability on Nostr, as users have to sign all posts using their secret key, preventing any relay from tampering with content without invalidating the signature.
The protocol is inspired by SSB (Secure Scuttlebutt).

Links

Nostr - Notes and Other Stuff Transmitted by Relays

Fiatjaf's initial blog post about Nostr:
https://fiatjaf.com/nostr.html

Private Messages on Nostr with MLS

https://rodsx.substack.com/p/private-messages-on-nostr-with-msl
What is MLS (Message Layer Security)? How is it different from what we had in Nostr?

How To Get Started With Nostr, Jack Dorsey's favorite decentralized social network

By Chris Castiglione, posted on Apr 11, 2023
https://forbes.com/sites/digital-assets/2023/04/11/how-to-get-started-with-nostr

Nostr is the decentralized protocol that might replace Elon Musk's Twitter

By Roger Huang, posted on Dec 29, 2022
https://forbes.com/sites/rogerhuang/2022/12/29/nostr-is-the-decentralized-protocol-that-might-replace-elon-musks-twitter/?sh=d8ea5e3442af
The challenge of a social network has never been really that on the technical level. People don't join a social network because of how many users a server can support, but rather the users and content that shows up there. It's a social problem above all else — something well-known to anybody who has built their version of Twitter at a hackathon (though sadly populated by nothing but ghosts of the creator).
The Nostr protocol is very simple technically: it uses relays to host and communicate public key information, and a series of clients built on the protocol for people to be able to broadcast from a public key. Developers rally around Telegram to build features. The Nostr protocol uses a series of NIPs to define the fundamentals of the network, with the data structure at core a simple “event” JSON.

Reference protocol implementation
https://github.com/nostr-protocol