Vitalik Buterin Links FOCIL and EIP-8141 for Rapid Tx Inclusion

• FOCIL EIP-7805 shifts from research into direct planning for the upcoming Hegota fork.
• Buterin says FOCIL with EIP-8141 lets smart wallets and privacy txs land in 1-2 slots.
• With 17 random includers in each slot, security proofs cut censorship odds below 0.01%.

Ethereum developers have advanced Fork-Choice Enforced Inclusion Lists, known as EIP-7805, as a core consensus upgrade for the upcoming Hegota fork. The proposal moves toward implementation planning after contributor Soispoke.eth said the feature had been “SFI’d,” signaling internal alignment. The development places censorship resistance and transaction inclusion guarantees at the center of Ethereum’s next upgrade cycle.

The update also gained public backing from Ethereum Co-Founder Vitalik Buterin, who described how FOCIL works alongside account abstraction improvements. He stated on X that FOCIL enables censorship-resistant, rapid inclusion of any transaction. He explained that the design pairs with EIP-8141 to expand direct on-chain access for smart wallets and privacy protocols.

Developers spent eighteen months building FOCIL’s security proofs. Researchers modeled validator collusion, coercion attempts, and protocol exploits. Their analysis found that selecting 17 participants per slot reduces censorship risk below 0.01 percent under pessimistic assumptions.

FOCIL Design and Security Model

FOCIL introduces small inclusion lists at the consensus layer. In its current iteration, each list measures 8 kilobytes. Buterin said the size remains intentionally small, yet developers can expand it later if blocks require larger portions of transactions to flow through FOCILs.

He explained that 17 randomly chosen actors participate in each slot. These actors include the block proposer and designated includers. According to Buterin, this structure enables near-certain transaction inclusion within one to two slots, even during adversarial conditions.

Researchers designed the system to counter validator centralization risks. Buterin stated that even if every slot were sold through proposer-builder separation to a hostile actor, transactions could still reach inclusion quickly. He added that FOCIL does not remove proposer centralization, yet it limits its influence.

Synergy With Account Abstraction

FOCIL operates alongside EIP-8141, which builds on EIP-7701. Buterin said EIP-8141 grants smart accounts first-class status on-chain. He noted that this includes multisig accounts, quantum-resistant signatures, key changes, and gas sponsorship features.

He added that privacy protocols can also gain direct inclusion rights. Transactions from these accounts no longer require wrappers or external broadcasters. Instead, they can enter a public mempool and move directly to a FOCIL includer.

Previously, advanced smart wallet models faced operational friction. They relied on extra layers and could encounter processing discrimination. With native status under EIP-8141, the protocol treats them equally with externally owned accounts.

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Interaction With MEV and MCP Designs

Buterin compared FOCIL’s structure with multiple concurrent proposer designs. He stated that FOCIL shares certain properties with MCP systems. Yet it does not attempt to control the MEV-relevant “last look” role.

Instead, the protocol continues to auction the last look function through encrypted proposer-builder separation. Buterin noted that MCP behavior depends heavily on design specifics. In contrast, FOCIL isolates inclusion guarantees from MEV control.

He described the approach as a way to disempower abusive proposer behavior. If hostile actors refuse to connect to public mempools or discriminate against applications, FOCIL still enables inclusion through randomly selected includers. This design aims to preserve rapid transaction processing across network conditions.

As Ethereum advances toward the Hegota fork, developers now shift from research to implementation planning for FOCIL and EIP-8141. With 17 actors selected per slot and 8-kilobyte inclusion lists, the network targets near-guaranteed inclusion within two slots. Could this model redefine transaction guarantees in adversarial blockchain environments?