According to The Block, Jesse Pollak, head of the Coinbase protocol, said in an interview with EthCC that the Coinbase Layer 2 network Base can be extended to zero-knowledge proofs (zk-proofs) in the future, and Base is currently based on Optimism Rollup, "but in the end we hope to have both." On May 30th, the Optimism Foundation issued a request for proposal for zk-proof designed for OP Stack. Three teams applied, including RISC Zero and O(1) Labs (the company behind the layer 1 network Mina), Pollak said. Pollak said he expects multiple implementations of zk-rollups (in the form of zk provers) to be included in the OP stack by 2024. He expects these to see adoption across Base, OP Mainnet, and other networks using his codebase.