Optimism Bedrock and the Superchain

Optimism's Evolution

Optimism, run by OP Labs (formerly Optimism PBC) and governed by the Optimism Collective, launched its first mainnet in 2021. The original architecture was complex and had performance and modularity limitations. Bedrock, deployed in June 2023, was a major rewrite that addressed these — modular components, dramatically reduced gas costs, and enabled the Superchain concept: a family of interoperable chains all running Bedrock and settling to Ethereum together.

What Bedrock Brought

Bedrock is the third-generation architecture. Key changes: modular components (execution, settlement, derivation, fault proofs all become swappable), shorter block times (2 seconds vs 12), dramatically simpler L1 derivation, calldata savings (~10% cheaper transactions), and a clean separation between execution layer and consensus. The cleanness of Bedrock's architecture is what made the Superchain concept practical.

The Superchain Concept

The Superchain is a set of L2s (Base, OP Mainnet, World Chain, Zora Network, Mode, plus many others) all built on the OP Stack — Optimism's open framework. These chains share: identical architecture, common security infrastructure, shared sequencer goals, and (increasingly) interoperability via cross-chain messaging. The vision: 'one big shared chain' that scales horizontally by adding more chains, all settling to Ethereum together.

• Bedrock (June 2023) = modular L2 architecture, ~10% cheaper transactions
• OP Stack = open framework letting anyone deploy a Superchain-compatible chain
• Base (Coinbase's chain), Zora, Mode, World Chain are all OP Stack chains
• Superchain vision: many chains, shared infrastructure, settled to Ethereum together