Ethereum builders draft EIP-7917 proposal to unravel the uncertainty of the prevailing proposer election.
Ethereum’s EIP-7917 Proposal
Ethereum builders Lin Oshitani (@linoscope), Justin Drake (@JustinDrake) collectively drafted the EIP-7917 proposal (Deterministic proposer lookahead), which goals to fully remedy the uncertainty drawback of the prevailing proposer election.
Excited to share EIP-7917 by me & @drakefjustin! It introduces deterministic proposer lookahead to the Beacon chain—a pure simplification that removes proposer unpredictability, which is essential for preconfirmation protocols. https://t.co/jtLBxNCHDV
Particulars in🧵
— Lin Oshitani (@linoscope) March 26, 2025
Word that within the current Ethereum consensus, the system selects a validator because the block proposer of the slot from your complete set of lively validators by a random sampling algorithm based mostly on random numbers (comparable to RANDAO) and efficient stability (Efficient Steadiness). Regardless that the RANDAO seed could be accessed upfront, the validator’s efficient stability might fluctuate throughout the epoch, making it troublesome to totally predict the proposer of the following epoch, which brings hidden risks to on-chain purposes based mostly on the pre-confirmation protocol.
An excerpt of EIP 7917
EIP-7917 solves the uncertainty of proposer association brought on by the dynamic change of validator efficient stability within the present design by pre-calculating and storing a deterministic proposer checklist originally of every epoch. This not solely improves the safety of the system and prevents validator manipulation, but in addition simplifies the implementation of the on-chain protocol whereas sustaining backward compatibility and scalability.
The duo has outlined a rationale thought-about options stating that, “Another method could be to cache the efficient balances in the beginning of epoch N so it may be used to calculate the proposer lookahead in the beginning of epoch N+MIN_SEED_LOOKAHEAD. Nonetheless, this method would require extra footprint within the beacon state, and wouldn’t be capable to present the proposer lookahead to the EVM through the beacon root.”
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