Vitalik: FOCIL and EIP-8141 collaborate to achieve fast and anti censorship on the chain Vitalik Buterin stated in an article on the X platform that there is an important synergy between the FOCIL mechanism and the account abstraction proposal Ethereum's EIP-8141 (based on 7701). EIP-8141 elevates smart accounts (including multi signature, anti quantum signature, key change, gas sponsorship, etc.) to "first-class citizens", meaning that operations from the account can be directly packaged as on chain transactions without additional encapsulation. At the same time, privacy protocols can also achieve multi tenant account models through paymaster or 2D nonce mechanisms, thereby obtaining the same level of native support. FOCIL provides a fast transaction inclusion mechanism that is resistant to censorship. Under the combination of the two, various transactions including smart wallet transactions, gas sponsorship transactions, and privacy protocol transactions can be included in the block through one of the 17 randomly selected roles (proposers or inclusions) in each time slot. Vitalik stated that this design ensures that transactions are almost always completed on chain within 1-2 time slots in adversarial environments. In the current version, the size of each FOCIL is about 8kB, which is relatively small, but there will be expansion paths in the future that can support most transactions in the block entering through the FOCIL channel. This architecture is similar in features to the Multi Parallel Proposer (MCP) design, but the difference is that FOCIL does not control the "last look" related to MEV, which is still allocated through the ePBS auction mechanism. Vitalik emphasized that even if 100% of block time slots are monopolized by adversaries through proposer builder separation (PBS) mechanisms, refusing to connect to public memory pools or discriminating against specific applications, FOCIL can still ensure that all transactions are quickly included. Although this design does not eliminate the centralization risk of proposer roles, it significantly weakens their power. Under the EIP-8141 framework, transactions from smart wallets or privacy protocols can be directly received by FOCIL participants through a public mempool without the need for additional intermediaries or encapsulation processes. Vitalik concluded that Ethereum is accelerating the upgrade of its core architecture.