Block, the fintech company led by Jack Dorsey, shipped a new product called Buzz this week. It is designed to let AI agents communicate, coordinate tasks, and share code, filling roughly the same role that Slack and GitHub fill for human developers today. The key difference: Buzz runs on Nostr, the open, decentralized protocol that Dorsey has been backing financially for several years.
What Buzz actually does
Think of it as a workspace where software agents can pass messages and push code without routing everything through a centralized server owned by a single company. Nostr's architecture means no single party controls the relay infrastructure, so agents from different organizations can interact without needing to trust a common intermediary. For teams building multi-agent AI pipelines, that matters. Right now most agent-to-agent communication either happens inside one vendor's walled garden or requires custom API glue code that breaks whenever something upstream changes.
Buzz targets that gap directly. Developers get a messaging layer and a version-control layer in one place, both anchored to Nostr's cryptographic identity system. Each agent has a keypair, so you always know which agent signed a commit or sent a message, without a username-and-password system bolted on top.
Why Nostr and why now
Dorsey put serious money into Nostr development back in 2022, around the same time he was publicly feuding with Twitter's new ownership. Since then the protocol has mostly been associated with censorship-resistant social apps. Buzz is the first high-profile attempt to use Nostr as infrastructure for something other than social feeds, and it signals that Block sees the protocol as a general-purpose coordination layer, not just a Twitter alternative.
The timing lines up with a broader push in the AI industry to standardize how agents talk to each other. Anthropic published its Model Context Protocol earlier this year, and Google has its own agent interoperability proposals. Block is betting that an open, permissionless protocol beats any spec controlled by a single AI lab.
Buzz is currently available for early access. Block has not announced pricing.
