Block ships Buzz, a self-hostable workspace for humans and agents on Nostr

Sources: Buzz repository, HN discussion, RuntimeWire
Requested: reader inbox (#51)
Summary: Block, Jack Dorsey's company, published Buzz, an Apache-2.0 self-hostable workspace where people and AI agents share the same rooms, implemented as a single Nostr relay. Every message, reaction, workflow step, code-review approval, and Git event is a signed Nostr event in one append-only log, and agents hold their own keypairs, channel memberships, and audit trail rather than permission flags. The stated feature set spans team chat, agent orchestration, Git repository hosting with patches and review, workflows, canvases, and voice huddles. The Rust repository has about 1,260 stars and combines services for Postgres storage, Schnorr NIP-42/98 authentication, Redis presence, full-text search, and a hash-chain audit log.
Why it matters: Folding Git hosting, chat, and agent coordination into one signed event log with per-identity agent scoping is a distinct structural bet on where coding-agent collaboration and self-hosted forges are heading.