Due to 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. Ultimately we count on emigrate to utilizing ZK proofs in any respect ranges of the stack, from consensus layer signature aggregation to onchain privateness with consumer aspect proving, and improve the protocol to be easier and extra zk-friendly. However step one will likely be an L1 zkEVM.
How we will ship an L1 zkEVM in lower than a 12 months
The quickest and most secure method to ship an L1 zkEVM is to start out by giving validators the choice to run purchasers that, relatively 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 dimension so succinct, downloading and verifying a number of proofs could be very cheap and permits us to use the identical protection in depth as current consumer variety to zkVMs.
For this plan to initially confirm execution proofs offchain, all we’d like from the protocol is a few type of pipelining in Glamsterdam to permit for extra proving time.
Initially, we count on few validators to run ZK purchasers. Over time, their safety will likely be demonstrated in manufacturing. With the EF additionally placing sources into formal verification, specification writing, audits, and bug bounties; we count on adoption will slowly enhance.
When a supermajority of stake is comfy operating ZK purchasers, we will enhance the gasoline restrict to a degree that might require validators operating cheap {hardware} to confirm proofs as an alternative 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 best benefit in executing this plan is the flexibility to harness your complete zkVM trade in the direction of making Ethereum by far the biggest ZK utility on the planet. Many zkVMs are already proving Ethereum blocks and efficiency breakthroughs are being introduced on a weekly foundation.
As a way 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 aspect, zkVMs concentrating on realtime proving ought to purpose for 128 bits of safety, which we think about the proper long-term goal for Ethereum L1. Nonetheless, we’re keen to just 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 beneath 300KiB and should not depend on recursive wrappers that use trusted setups. We count on proof methods to maneuver to 128-bit safety by the point ZK purchasers are in manufacturing and to additional tighten safety necessities (e.g. concerning conjectures) as proving time decreases.
With the present slot time of 12 seconds and most time to propagate information throughout the community of ~1.5 seconds, realtime means 10 seconds or much less. We count on 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 arduous forks.
As a way 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 number of the solo stakers who presently run validators from dwelling will opt-in to proving. Although we count on to harden censorship resistance by means of enforced transaction inclusion earlier than verifying ZK proofs is made necessary, dwelling proving is a vital ultimate safeguard.
Since proving within the cloud is already fairly low cost with multi-GPU spot cases, the main target for zkVM groups concentrating on realtime proving will largely be optimizing for operating 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 count on this to come back down over time even because the gasoline restrict is elevated.
Greater than {hardware} value, probably the most vital 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 can have circuits supposed for electrical home equipment or charging electrical automobiles with 10kW capability. Subsequently, realtime proving have to be doable on {hardware} operating 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: Absolutely 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 turn into future core infrastructure for Ethereum.
