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Shipping an L1 zkEVM #1: Realtime Proving

July 11, 2025
in Ethereum
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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 evaluate.

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 improve the protocol to be less complicated and extra zk-friendly. However step one shall be an L1 zkEVM.

Table of Contents

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  • How we will ship an L1 zkEVM in lower than a 12 months
  • Defining realtime proving for the L1
  • The race to realtime

How we will ship an L1 zkEVM in lower than a 12 months

The quickest and most secure solution to ship an L1 zkEVM is to start out by giving validators the choice to run shoppers that, quite than re-executing execution payloads, statelessly confirm a number of (let’s say three) proofs generated by completely different zkVMs every proving completely different EVM implementations. As a result of proof verification is so quick and proof measurement so succinct, downloading and verifying a number of proofs may be very affordable and permits us to use the identical protection in depth as present 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 shoppers. Over time, their safety shall be demonstrated in manufacturing. With the EF additionally placing assets into formal verification, specification writing, audits, and bug bounties; we anticipate adoption will slowly enhance.

When a supermajority of stake is snug working ZK shoppers, we will enhance the fuel restrict to a degree that might 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 will 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 this planet. Many zkVMs are already proving Ethereum blocks and efficiency breakthroughs are being introduced on a weekly foundation.

So as to keep 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 focusing on realtime proving ought to goal for 128 bits of safety, which we take into account the appropriate long-term goal for Ethereum L1. Nevertheless, we’re keen 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 measurement ought to stay below 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 shoppers 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 not less than 99% of mainnet blocks on this window, with the tail finish (in addition to artificial DOS vectors) mitigated in future laborious forks.

So as to keep the very best ranges of liveness and censorship resistance, our definition of realtime proving goals to allow “dwelling proving” with the concept a few of the solo stakers who at present run validators from dwelling will opt-in to proving. Though we anticipate to harden censorship resistance via enforced transaction inclusion earlier than verifying ZK proofs is made necessary, dwelling proving is a crucial ultimate safeguard.

Since proving within the cloud is already fairly low cost with multi-GPU spot situations, the main focus for zkVM groups focusing on realtime proving will largely be optimizing for working provers on-prem the place the specs are way 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 fuel restrict is elevated.

Greater than {hardware} price, probably the most important constraint for dwelling proving utilizing GPUs is vitality utilization. Most residential properties have not less than 10kW getting 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 potential on {hardware} working at 10kW or much less.

This brings us to our working definition of realtime proving:

Latency: <= 10s for P99 of mainnet blocksOn-prem CAPEX: <= 100k USDOn-prem energy: <= 10kWCode: Absolutely open sourceSecurity: >= 128 bitsProof measurement: <= 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 turn into future core infrastructure for Ethereum.



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Tags: ProvingRealTimeShippingzkEVM
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