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Block’s new open-source app “Buzz” is a self-hosted Slack-meets-GitHub built on a Nostr relay. I don’t have enough characters to explain what that all means, but think of it like a private Slack alternative. Oh, and you can vibe-code in it. [Image: https://platform.theverge.com/wp-content/uploads/sites/2/2026/07/Buzz-screenshot-1.png?quality=90&strip=all]