In a bold move aimed at tackling builder centralization within the Ethereum ecosystem, co-founder Vitalik Buterin has proposed the “Big FOCIL” initiative. This proposal comes ahead of the highly anticipated Glamsterdam upgrade, marking yet another significant development in Ethereum’s ongoing evolution.
Buterin articulated that the enshrined Proposer-Builder Separation (ePBS) being introduced in Glamsterdam will enable block proposers to source block construction from a permissionless marketplace of builders. While he acknowledged that ePBS serves to curb the potential for dominance within the staking ecosystem, he cautioned that it does not entirely mitigate the issues surrounding builder concentration. In this light, he presented Big FOCIL as a necessary protocol-level response.
Big FOCIL and its Implications
Developers are set to roll out ePBS in Glamsterdam, which fundamentally reshapes the relationship between block proposers and builders. Proposers will benefit from the competitive landscape of block builders, who must vie for selection based on the most favorable bids. In his recent communications, Buterin emphasized that this structure maintains a critical balance, preventing builder dominance from bleeding into staking mechanisms.
Finally, the block building pipeline.
In Glamsterdam, Ethereum is getting ePBS, which lets proposers outsource to a free permissionless market of block builders.
This ensures that block builder centralization does not creep into staking centralization, but it leaves the…
– Vitalik Buterin
However, Buterin raised an imperative question: how to effectively address builder centralization itself? Noticing that certain sophisticated actors could optimize transaction ordering to their advantage, he introduced the concept of Forward Obligatory Commitment to Inclusion Lists (FOCIL). This mechanism would involve a random selection of 16 attesters who would decide which transactions need to be included in a block. If any transaction is omitted unjustifiably, the block would simply be rejected.
Buterin’s vision for Big FOCIL expands upon this by allowing the inclusion lists to cover all transactions within a block. Participants would be able to select transactions based on predetermined sender address rules and their pending statuses, promoting fairness and efficiency in the process. This arrangement would encourage builders to concentrate on transactions related to maximal extractable value (MEV) and state execution, thereby distributing opportunities more broadly across participants.
Addressing Toxic MEV Practices
A significant part of Buterin’s proposal includes tackling toxic MEV strategies, such as sandwich attacks and frontrunning, which have become prevalent in trading practices. To mitigate these concerns, Buterin is exploring the use of encrypted mempools—a technical solution to prevent malicious actors from reordering trades to extract value.
By ensuring that transactions stay encrypted until they are included in a block, the preemptive visibility that allows these hostile tactics would be eliminated. As Buterin aptly stated, “If a transaction is encrypted until it’s included, no one gets the opportunity to ‘wrap’ it in a hostile way.” Nevertheless, the challenge persists in making sure that these encrypted transactions maintain validity and can be decrypted correctly at the right time. Developers are actively working on methods to validate these transactions efficiently while ensuring compatibility with existing mempool systems.
A Vision for the Future
In his overarching analysis, Buterin also examined the transaction ingress layer, focusing on the path that transactions take from user submission to block inclusion. He highlighted the vulnerabilities arising from transactions being sent in the clear, notably the risks of sandwich attacks and transaction griefing. Moreover, he pointed out how public nodes could observe these activities, necessitating work on network-layer anonymization solutions.
Proposed solutions include the use of Tor routing, Ethereum-focused mixnets, and systems like Flashnet to enhance privacy while maintaining functionality. The Kohaku initiative has also been mentioned as a potential partner in integrating such advancements. Beyond the immediate concerns, Buterin discussed the importance of distributed block building as a long-term solution to mitigate centralization risks. He emphasized that many transactions may not necessitate a global state, suggesting the introduction of new transaction categories that could operate on a more efficient distributed processing model.
As Ethereum’s Glamsterdam upgrade looms on the horizon, Buterin’s Big FOCIL initiative serves as a critical step towards reducing builder control while preserving the network’s foundational integrity. The Ethereum community is buzzing with anticipation as developers continue to refine these compelling ideas.
