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Home Ethereum

Shipping an L1 zkEVM #1: Realtime Proving

by n70products
July 11, 2025
in Ethereum
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Shipping an L1 zkEVM #1: Realtime Proving
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Because of Kevaundray Wedderburn, Alex Stokes, Tim Beiko, Mary Maller, Alexander Hicks, George Kadianakis, Dankrad Feist, and Justin Drake for suggestions and overview.

Ethereum goes all in on ZK. Finally we anticipate emigrate to utilizing ZK proofs in any respect ranges of the stack, from consensus layer signature aggregation to onchain privateness with shopper facet proving, and upgrade the protocol to be simpler and more zk-friendly. However step one can be an L1 zkEVM.

How we are able to ship an L1 zkEVM in lower than a 12 months

The quickest and most secure option to ship an L1 zkEVM is to begin by giving validators the choice to run purchasers that, somewhat than re-executing execution payloads, statelessly confirm a number of (let’s say three) proofs generated by totally different zkVMs every proving totally different EVM implementations. As a result of proof verification is so quick and proof dimension so succinct, downloading and verifying a number of proofs could be very affordable and permits us to use the identical protection in depth as current shopper variety to zkVMs.

For this plan to initially confirm execution proofs offchain, all we want from the protocol is a few type of pipelining in Glamsterdam to permit for extra proving time.

Initially, we anticipate few validators to run ZK purchasers. Over time, their safety can be demonstrated in manufacturing. With the EF additionally placing sources into formal verification, specification writing, audits, and bug bounties; we anticipate adoption will slowly enhance.

When a supermajority of stake is snug working ZK purchasers, we are able to enhance the gasoline restrict to a stage that will require validators working affordable {hardware} to confirm proofs as a substitute of re-executing blocks. As soon as all validators are verifying execution proofs, the identical proofs may also be utilized by an EXECUTE precompile for native zk-rollups.

Defining realtime proving for the L1

Our biggest benefit in executing this plan is the flexibility to harness the whole zkVM trade in the direction of making Ethereum by far the biggest ZK utility on the earth. Many zkVMs are already proving Ethereum blocks and efficiency breakthroughs are being introduced on a weekly foundation.

With the intention to preserve the safety, liveness, and censorship-resistance properties of the L1 the Ethereum Basis is proposing a standardized definition of realtime proving for zkVM groups to work in the direction of.

On the proof system facet, zkVMs concentrating on realtime proving ought to intention for 128 bits of safety, which we take into account the correct long-term goal for Ethereum L1. Nevertheless, we’re prepared to simply accept a minimal of 100 bits of safety within the preliminary months of deployment, to accommodate short-term engineering challenges in reaching 128 bits. Proof dimension ought to stay underneath 300KiB and should not depend on recursive wrappers that use trusted setups. We anticipate proof techniques to maneuver to 128-bit safety by the point ZK purchasers are in manufacturing and to additional tighten safety necessities (e.g. relating to conjectures) as proving time decreases.

With the present slot time of 12 seconds and most time to propagate knowledge throughout the community of ~1.5 seconds, realtime means 10 seconds or much less. We anticipate zkVMs to have the ability to show at the very least 99% of mainnet blocks on this window, with the tail finish (in addition to artificial DOS vectors) mitigated in future laborious forks.

With the intention to preserve the best ranges of liveness and censorship resistance, our definition of realtime proving goals to allow “dwelling proving” with the concept that a few of the solo stakers who at present run validators from dwelling will opt-in to proving. Although we anticipate to harden censorship resistance by way of enforced transaction inclusion earlier than verifying ZK proofs is made necessary, dwelling proving is a vital last safeguard.

Since proving within the cloud is already fairly low cost with multi-GPU spot situations, the main focus for zkVM groups concentrating on realtime proving will largely be optimizing for working provers on-prem the place the specs are rather more constrained. On-prem realtime proving ought to require a most capital expenditure of 100k USD (at time of writing it requires ~$80k in stake to run a validator). We anticipate this to come back down over time even because the gasoline restrict is elevated.

Greater than {hardware} value, essentially the most important constraint for dwelling proving utilizing GPUs is power utilization. Most residential properties have at the very least 10kW coming into from the road and a few may have circuits supposed for electrical home equipment or charging electrical autos with 10kW capability. Subsequently, realtime proving should be doable on {hardware} working at 10kW or much less.

This brings us to our working definition of realtime proving:

  • Latency: <= 10s for P99 of mainnet blocks
  • On-prem CAPEX: <= 100k USD
  • On-prem energy: <= 10kW
  • Code: Totally open supply
  • Safety: >= 128 bits
  • Proof dimension: <= 300KiB with no trusted setups

The race to realtime

Between now and Devconnect Argentina, we hope to see zkVM groups proceed innovating in the direction of realtime dwelling proving, and for the main zkVMs to develop into future core infrastructure for Ethereum.



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