Block Launches Buzz: Nostr-backed Open-Source Team Workspace with AI Agents

Block — the payments and software company led by Jack Dorsey — quietly launched Buzz, an open-source team workspace that blends chat, code, and AI agents into a single product aimed at reducing the firm’s dependence on Slack and GitHub. What Buzz is - A free, open-source group chat and collaboration platform where humans and AI agents work side-by-side. It bundles channels, threads, direct messages, voice, media sharing, repos, and automated workflows into one interface intended to feel familiar to users of modern team-chat tools. - Built to be “model-agnostic, decentralized, self-sovereign, and open source,” per Dorsey’s announcement on July 21, 2026. Key technical and product details - Agents and people each hold cryptographic identities (keypairs). Every piece of activity — messages, reactions, workflow steps, reviews, git events — is recorded as a signed event and chained into an auditable hash-chain, so identity, history and reputation can travel across Nostr-compatible systems. - Buzz sits on Nostr as its identity and transport layer. However, each Buzz workspace currently runs on a single relay that the project calls its “single source of truth,” a pragmatic centralization tradeoff in an otherwise decentralized framing. - The platform is agent- and model-agnostic: teams can deploy agents using any LLM or agent framework, including Anthropic’s Claude Code, OpenAI’s Codex, and goose (Block’s open-source agent framework introduced in January 2025). - Code is open under Apache 2.0 at github.com/block/buzz. Teams can self-host or use Block’s managed instance. Buzz is early-stage (v0.4.21) with desktop builds for macOS, Windows and Linux; mobile clients are not yet finished. How agents work in Buzz - Agents hold their own keys and permissions, can post, review code, run approved automations, create channels, update their own memories, and take CLI-level actions within boundaries set by users. Channel- and thread-specific rules let teams limit agent behavior. - Block says many internal workflows were developed and iterated using agents; Thomas Petersen, principal designer and AI strategist, says “the entire platform” was developed with agents to make the experience less “lonely” and more collaborative. Block’s rationale and internal thinking - Bradley Axen, head of AI capabilities at Block, argues that every company will need a place where humans and agents work together, and the real question is whether that place is proprietary or open. - Lucas Isaza (AI & product) framed Buzz as a way to avoid tooling that bakes operational rituals into workflows (Asana, Jira, etc.). In Buzz, a single thread can contain diagnosis, task, fix and context — condensing what used to require multiple tools into one auditable record. Where Buzz fits in Dorsey’s ecosystem - Buzz extends Jack Dorsey’s long-running push for open, decentralized protocols. Since leaving Twitter he’s funded and backed several Nostr-based and decentralized projects (including Bitchat and other tools), stepped away from Bluesky’s board in 2024, and supported nonprofits for open social tooling. - That posture has encountered friction: Nostr-based apps have run into bans and removals in some jurisdictions, such as China’s removal of a Dorsey-funded Bluetooth mesh messenger in April. Tradeoffs and takeaways for crypto audiences - Identity portability: Buzz’s use of Nostr keypairs and signed events makes identity and reputation portable in ways that traditional SaaS can’t match — an appealing property for crypto-native organizations and builders. - Open-source + self-hosting: Apache 2.0 licensing and self-host options let teams run Buzz in a trust-minimized way, but the single-relay workspace model introduces a central point that teams will need to consider. - Agent governance: Fine-grained rules, permissioning, and auditable logs are built into the system, which matters for compliance and security as AI agents take more active roles in development and ops. - Early product: It’s a nascent product (v0.4.21). Block is still experimenting with which models and agent patterns produce the most value. Context on Block and Dorsey - Block cut roughly 4,000 jobs (about 40% of staff) in February 2026, with Dorsey stressing that AI changes how companies are built and run. - The company has also been active in crypto payments and treasury: in April it disclosed holdings of 28,355 BTC (~$2.2 billion at the time) in a proof-of-reserves report, and earlier added stablecoin support to Cash App’s payment flow. Bottom line Buzz is an early, ambitious attempt to bring decentralized identity, auditable provenance and model-agnostic AI agents into the team collaboration stack. For crypto-native teams, its Nostr-backed identity model and open-source code make it worth watching — especially as Block iterates on relay architecture, mobile clients, and the governance patterns that will determine whether Buzz remains a decentralized building block or drifts toward a managed SaaS experience.