Nostr is a decentralized messaging and publishing protocol built around signed events. Users control identity with public/private key pairs, and clients distribute profile data and messages through independent relays instead of one central server. Because the protocol is open and relay-based, profile metadata can be updated without changing a malware binary or a victim-facing domain.
In cyber security, that flexibility matters. Attackers can hide command-and-control details in profile fields, relay lists, or other publicly visible metadata, then have an implant query relays to recover the next-stage server. This can make infrastructure harder to blocklist and easier to rotate. Defenders look for suspicious relay queries, unusual profile changes tied to threat infrastructure, and binaries that fetch destinations from public decentralized services rather than hard-coding them.