Base network transitioned from Stage 0 to Stage 1 through decentralising the fault proof validation and contract upgrade governance, reducing Coinbase’s control, aligning with Vitalik Buterin’s rollup framework

Quotes that support claims

Stage 1 required more than just fault proofs, including a security council with decentralized governance and reduced Coinbase control

Achieving the so-called stage 1 rollup status stems from a blog post from Ethereum co-founder Vitalik Buterin, where he categorized platforms according to their degree of decentralization