Base to Replace Optimism OP Stack With Proprietary Unified Architecture in 2026 Shift

On February 18, 2026, Coinbase's Layer-2 network Base confirmed it will migrate off the Optimism OP Stack to a proprietary unified, self-managed architecture. The phased transition includes governance changes, multiple hard forks, a new Base client for node operators, and is expected to reshape sequencer revenue flows while accelerating the network's upgrade pace.