Ethereum Foundation and Verity formally verify EIP-8282, surfacing discrepancies for researchers

Formal verification of the builder lifecycle proposal produced three proven guarantees and a list of issues for Ethereum researchers to resolve The Ethereum Foundation worked with Verity, a formal verification firm, to mathematically check EIP-8282. The proposal governs how block builders enter and leave the system. The work produced three proven guarantees about the proposal’s runtime bytecode. It also turned up discrepancies that researchers now need to address. What Verity actually checked EIP-8282 was created on May 22, 2026. It covers the lifecycle functions of block builders, the parties responsible for assembling blocks on the network. The proposal sets up dedicated contracts to manage builder deposits and exits. Verity finished its verification work in September 2026. The firm’s output centered on the correctness of the EIP’s runtime bytecode, which is the low-level code that would actually execute onchain. Verity proved three guarantees. They confirm the bytecode correctly handles the scenarios tied to user submissions, meaning paid calls, as well as SYSTEM calls. SYSTEM calls are invocations made by the protocol itself rather than by an ordinary user. Proofs, mutations an...