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Block launches Buzz open-source workspace for humans and AI agents

Block launches Buzz open-source workspace for humans and AI agents

Jack Dorsey’s free collaboration platform runs on Nostr, combining chat, code hosting and multi-model AI agents whose work is signed with cryptographic identities.

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Fact Check
Block's official page 'Introducing Buzz: where humans and agents work together' confirms Buzz launched July 21, 2026 as an open-source, Nostr-based workspace for humans and AI agents, with Git integration and Apache 2.0 self-hostable licensing. Jack Dorsey's X post directly confirms he announced Buzz and that it aims to reduce dependency on Slack and GitHub, matching the claim precisely. Two independent news outlets (Crypto Briefing and Bitcoin Magazine) corroborate all key elements: Nostr-based platform, chat/code/workflows, audit trails via signed activity logs, and the Slack/GitHub replacement goal.
Summary

Block has launched Buzz, a free open-source collaboration platform built on the Nostr protocol that combines team chat, Git repository hosting and multi-model AI agents in a shared workspace. The product is designed to let humans and AI agents work side by side, with each agent assigned a unique cryptographic identity that can sign its own code, messages and other outputs. Buzz supports multiple AI models including Claude Code and OpenAI Codex rather than relying on a single provider. Built on Nostr, every message, commit and AI-generated output is cryptographically signed, creating a verifiable record of authorship and helping teams track whether work came from a human or an AI agent. The platform is available as a free desktop application for macOS, Windows and Linux, with hosted access through buzz.xyz. Organizations can also self-host Buzz, and the codebase is published under the Apache 2.0 license. The launch deepens Jack Dorsey’s long-running support for Nostr, a decentralized protocol for signed messages and event handling that he backed with a 14 BTC donation in 2022. Buzz enters a market dominated by tools such as Salesforce-owned Slack and Microsoft-owned GitHub, while Block is positioning it as a productivity product without a cryptocurrency token or governance structure.

Terms & Concepts
  • Nostr: A decentralized protocol for signed messages and event handling that uses cryptographic keys to verify identity and authorship.
  • Git repository hosting: A service for storing, managing and collaborating on code changes tracked with Git.
  • cryptographic identity: A digital identity based on cryptographic keys that can authenticate a user or software agent and sign its actions.