Cobalt Network Upgrade

Base · Releases & Updates · September 30, 2026

Base, Coinbase's OP Stack Ethereum L2, ships its Cobalt network upgrade to mainnet on September 30, 2026.

Base is an Ethereum Layer 2 blockchain incubated by Coinbase, built on the Optimism OP Stack as part of the Superchain. The Cobalt network upgrade, live on Sepolia since September 23 and shipping to mainnet on September 30, 2026, brings B20 token standard improvements (including paying fees in B20 tokens and Union/Intersect policies), validity transactions, dynamic node upgrades and on-chain TEE signer registration. The Cobalt upgrade is a major Base L2 infrastructure and scaling event.

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