# Overview

The first release of the OP Stack codebase is called Bedrock. The Bedrock release primarily consists of the core software required to run L2 blockchains and was originally designed to power an upgrade to the Optimism Mainnet network.

# Resources

# Rollup Protocol

Learn about the basics of the Rollup protocol used by Bedrock on the Rollup Protocol (opens new window) page.

# Bedrock Explainer

Learn all about the Bedrock release of the OP Stack by reading the Bedrock Explainer.

# Specifications

Dive deep into the specifications for the Bedrock release in the specs folder of the Optimism Monorepo (opens new window).

# Components

• op-node (opens new window)
• op-geth (opens new window)
• op-batcher (opens new window)
• op-proposer (opens new window)
• contracts-bedrock (opens new window)
• fault-detector (opens new window)
• sdk (opens new window)
• chain-mon (opens new window)