---
title: "builder/publish"
description: "WebSocket broadcast publisher for flashblock distribution."
source: https://basehub.org/crates/builder/publish/
---
import { LinkCard } from '@astrojs/starlight/components';

## Overview

The `base-builder-publish` crate is the WebSocket broadcast publisher for the OP Stack block builder. It streams produced flashblocks and canonical blocks to connected clients.

## Source

<LinkCard title="View source on GitHub" href="https://github.com/base/base/tree/main/crates/builder/publish" />