Definition
Nostr — short for "Notes and Other Stuff Transmitted by Relays" — is an open protocol for decentralized social networking and messaging. Instead of an account on a company's server, your identity is a cryptographic key pair that you generate and control. You sign every message with your private key, and independent servers called relays store and forward those signed messages. No single company owns the network, and no platform can deplatform a key it does not control.
How it works
A Nostr client signs each note with your private key and publishes it to one or more relays. Anyone following your public key can fetch your notes from any relay that carries them. Because messages are signed, a relay cannot forge or alter them — it can only choose whether to relay them. If a relay censors you, you simply publish to another. This separation of identity (your key) from hosting (the relays) is what makes Nostr resilient.
Why it matters for sovereignty
Nostr mirrors Bitcoin's design philosophy: self-custodied keys, no central gatekeeper, and a simple protocol that anyone can implement or self-host. It is increasingly paired with Bitcoin's Lightning Network for value transfer (see Zaps). For sovereign Bitcoiners, running your own relay alongside your node keeps both your money and your communications outside corporate platforms.
D-Central covers Nostr and related self-hosted tooling in our digital sovereignty hub and the sovereign self-hosting catalog.
Browse the protocol specs in the Nostr NIPs reference (94).
In Simple Terms
Nostr — short for “Notes and Other Stuff Transmitted by Relays” — is an open protocol for decentralized social networking and messaging. Instead of an…