Key Highlights
- The protocol will strip exclusive block-construction authority from builders to prevent a centralized takeover of the network.
- The control shifts from a few high-powered entities back to the broader community of individual validators to ensure fair access.
- This update serves as a programmable barrier to prevent Ethereum’s infrastructure from evolving into a traditional, closed financial system.
Researcher Thomas Thiery, known as soispoke, along with other contributors, proposed Fork-Choice Enforced Inclusion Lists (FOCIL, EIP-7805) on Wednesday, aiming to protect Ethereum’s fundamental principles. The mechanism is expected to become a part of the upcoming Hegota upgrade, currently targeted for late 2026.
The adjustment aims to prevent network censorship by allowing multiple validators to work together, ensuring valid transactions are included according to the fork-choice rule.
By requiring transactions to be processed within a set timeframe, the proposal seeks to limit the growing power of centralized block builders who currently have a lot of control over transaction ordering. Developers are prioritizing this change to keep Ethereum a neutral and decentralized ledger rather than letting it become dominated by a few intermediaries.
A push for fairness
The move toward FOCIL is not just a technical adjustment; it reflects a call for fairness built into Ethereum’s code. The network has had to contend with issues related to the growing influence of specialized builders who are able to selectively decide which transactions to validate in order to maximize their profits or in response to external pressures.
FOCIL removes this kind of exclusionary power from the centralized bodies and returns it to the thousands of individual validators who help to support the network. This is a reflection of a very important struggle within the environment: the struggle to prevent Ethereum from becoming what it originally set out to replace, the centralized banking systems.
Breaking the builder monopoly
The main feature of EIP-7805 sets a binding requirement for block creation. Currently, a single block builder decides which transactions get included in a block. Under the new proposal, a group of validators will create an inclusion list of pending transactions from the public mempool.
Thiery’s research paper, “Who Wins Ethereum Block Building Auctions and Why?” shows the urgency of this transition. The study reveals that only three builders produced 80% of all Ethereum blocks between late 2023 and early 2024.
This “chicken-and-egg” problem means dominant builders receive exclusive order flow because they win blocks, and they win blocks because they have exclusive order flow. FOCIL breaks this cycle by introducing a committee-based design where a rotating group of validators get local inclusion lists based on their own view of the mempool.
Cryptographic guarantee of neutrality
If a builder tries to leave out these transactions, the fork-choice rule will require validators to reject that block and select another one that follows the list. This offers a cryptographic guarantee that no one entity can permanently gatekeep the blockchain.
The proposal responds directly to the delay of similar features in the previous Glamsterdam upgrade. Although Glamsterdam, set for the first half of 2026, focuses on Proposer-Builder Separation (ePBS) to promote fairness in the network, developers concluded that FOCIL needed more thorough review before becoming a key feature.
Future protocol resilience
By separating censorship resistance from block production, Ethereum can continue to grow with builders without compromising its credibility. For users, this means better assurance that their transactions won’t be unjustly blocked or delayed by institutional competitors or centralized intermediaries. For the wider industry, it sets an example for protocol-level resistance against the “cartelization” of block building, ensuring that the network’s rules stay clear and fair.
Adding FOCIL as the primary feature for Hegota shows the dedication to the blockchain’s core principles. As the scale and resource requirements for the node operators grow, the risk of centralization becomes more prominent. Through this move, Ethereum can maintain its position to build a system that is open to all, irrespective of the changes in the regulatory or economic landscape.
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