Block

AI Agents · Enterprise Software · Fintech

Launch

Block launches Buzz, an open-source Slack-like hub for humans and AI agents

Each agent gets a cryptographic signature tied to its human owner, creating an audit trail for AI-driven work.

• Block launched Buzz on July 21, 2026, a free, open-source workspace built on the Nostr protocol that lets AI agents join channels, threads and DMs as full participants alongside humans.
• Built by Jack Dorsey's Block, Buzz works with any AI model or agent harness, including Claude Code, Codex, and Goose, Block's own open-source coding agent.
• Every agent gets its own public-private keypair on Nostr, plus a second signature that cryptographically links it back to the human who owns it, letting teams verify and restrict agent access to private channels.
• Under the hood, Buzz runs on a Rust stack with Postgres storage, Redis for presence, Schnorr-signature authentication, and a hash-chain audit log, and is designed to be self-hosted rather than run as a vendor service.
• The launch follows Block cutting over 4,000 jobs in February, a restructuring Dorsey tied publicly to AI tooling; Goose already sees weekly use from roughly 60% of the company's remaining employees.
• Buzz arrives amid a broader shift from single-user chatbots to 'multiplayer AI,' where agents share workflows and context across a team rather than working in isolated sessions with each employee.
• Most coding-agent work today happens in private one-on-one sessions and then vanishes; by making agent conversations visible and cryptographically attributable, Buzz targets a real accountability gap in enterprise AI adoption.