Ethereum to Combat Censorship via New FOCIL Consensus Layer Mechanism

The Ethereum Foundation has officially integrated a new anti-censorship protocol into its future development roadmap to address growing concerns over network centralization. During the recent EthCC conference, researcher Jihoon Song unveiled the details of Fork-Choice Enforced Inclusion Lists (FOCIL), also known as EIP-7805. This mechanism is designed to embed transaction inclusion requirements directly into Ethereum’s consensus layer, ensuring that the network remains neutral and resistant to external pressures that might otherwise block specific transactions.

Shifting Power from Builders to Decentralized Validators

The primary motivation behind FOCIL is the current imbalance in the Ethereum block production ecosystem. At present, over 80% of blocks are produced by a very small number of sophisticated entities known as builders. This concentration of power creates a significant censorship risk, as these builders have the discretion to exclude transactions based on regulatory or private preferences. FOCIL aims to decentralize this authority by empowering a larger set of participants.

• The mechanism utilizes a 16-validator committee selected for each slot.
• These validators create "inclusion lists" of transactions that must be processed.
• Block builders are forced to include these transactions or face the rejection of their block by the network's fork-choice rule.
• This shift ensures that inclusion rights move from a few centralized builders back to the decentralized validator set.

Implementation Status and Technical Optimization

While the proposal represents a significant shift in Ethereum's architecture, the technical groundwork is already underway. Most Ethereum clients have already completed prototype implementations of the FOCIL logic, signaling strong developer alignment. Current efforts are focused on refining the protocol to ensure it does not negatively impact network performance or user costs.

"FOCIL proposes to enforce transaction inclusion through a committee, shifting rights from a few builders to decentralized validators to mitigate censorship risk", stated Jihoon Song during the presentation.

The community is currently prioritizing the optimization of proof sizes and gas efficiency to ensure that the inclusion of these lists does not lead to network congestion. As an EIP (Ethereum Improvement Proposal), EIP-7805 will undergo rigorous testing before being bundled into a subsequent major hard fork upgrade.

By integrating anti-censorship measures directly into the consensus layer, Ethereum aims to reinforce its position as a permissionless and credibly neutral blockchain. As the network matures, the successful deployment of FOCIL will be a critical milestone in protecting the ecosystem from centralized chokepoints and ensuring that the Ethereum blockchain remains accessible to all users regardless of geographical or regulatory constraints.