Coinbase's layer-2 chain

Base, has enabled proof-of-failures on mainnet, according to a blog post from Base "Proof of failures is an important part from Phase 0 to Phase 1, where the cryptocurrency has a 'full training wheel' and in Phase 1, the cryptocurrency has a 'limited training wheel'. This year, the Base core team worked closely with Optimism to bring the OP stack error-proofing system to Base. This enables a decentralized approach to proposing and validating L2 states and paves the way for more community engagement.