Introduction
On July 21, 2026, Jack Dorsey and Block — the parent company behind Square and Cash App — unveiled an enterprise collaboration platform called Buzz. The ambition is clear: replace both Slack for team messaging and GitHub for code hosting with a single, decentralized, fully open-source workspace.
More Than Another Slack Clone
At first glance, Buzz looks familiar — channels, threads, direct messages, media sharing, voice calls. But it goes further by embedding Git repository management directly into the interface. Where teams once juggled two separate tools for communication and version control, Buzz brings both into one unified environment.
What truly sets Buzz apart is its underlying architecture. The platform is built on Nostr, a decentralized protocol where every action — message, reaction, commit, workflow approval — is recorded as a cryptographically signed event. Teams get a complete, queryable audit trail without relying on any proprietary third-party server.
AI Agents as First-Class Workspace Members
AI agent integration in Buzz is not a bolt-on feature. Unlike the bots traditionally grafted onto the periphery of Slack through third-party integrations, agents in Buzz are full members of the workspace. They can browse past conversations, submit code patches, review commits, and trigger workflows using the same primitives as human team members.
The conceptual shift: each agent has its own cryptographic identity, linked to its human owner through a dual Nostr signature. Every action taken by an agent is therefore traceable and attributable — an increasingly non-negotiable requirement for organizations deploying autonomous agents on sensitive systems. The platform currently supports Claude Code, Codex, and Goose (Block's in-house framework, which has surpassed 50,000 stars on GitHub) via the ACP (Agent Client Protocol).
Infrastructure Sovereignty as a Commercial Differentiator
Block is positioning Buzz on ground that Slack cannot easily contest: data ownership. Teams can deploy their own Nostr relay for full infrastructure control, or use the relay Block hosts for free. The code is published under the Apache 2.0 license.
This is precisely the lever that makes the proposition compelling in a B2B context — particularly in Europe, where data resilience, portability, and vendor lock-in carry increasing weight in procurement decisions. A proprietary tool like Slack cannot offer this structural guarantee, and neither can GitHub, whose teams depend on Microsoft's centralized infrastructure.
A Work in Progress — but a Clear Signal for Software Vendors
Buzz is currently at version 0.4, and its creators describe it as very much a product under construction. Desktop applications are available free of charge on macOS, Windows, and Linux — a full-scale Slack migration is not yet a near-term prospect. But beyond the product itself, Block's move sends an unambiguous market signal: enterprise collaboration is being rebuilt around open source, decentralization, and autonomous agents. Vendors of proprietary productivity suites would be wise to take note before the movement gains real momentum.