ZK-Rollup Architecture: SNARK vs. STARK Verification Gas Costs, Blobspace, and EIP-4844 Economics
A technical and economic audit of on-chain zero-knowledge proof verification costs, recursive SNARK batching, and blob fee market mechanics.
Rollup Margin Modeler
Calculate L1 verification gas fees and sequencer profit margins
Empirical Analysis & Findings
## Zero-Knowledge Verification and L1 Data Availability
Ethereum Layer 2 rollups scale throughput by executing thousands of state transitions off-chain, compressing resulting state differences, and publishing cryptographic validity proofs back to the Layer 1 settlement layer.
### 1. Gas Verification Costs: Groth16 vs PLONK vs STARK
| Proof System | Prover Time (Per Tx) | Proof Size (Bytes) | L1 Verification Gas | Trusted Setup Required | Quantum Resistant |
|:-------------|:--------------------:|:------------------:|:-------------------:|:---------------------:|:-----------------:|
| Groth16 (SNARK) | 120 ms | 260 B | ~215,000 | Yes (Circuit-Specific) | No |
| PLONK (KZG) | 280 ms | 480 B | ~290,000 | Yes (Universal) | No |
| Boojum (zkSync) | 90 ms | 1.2 KB | ~380,000 | Yes (Universal) | No |
| STARK (FRI) | 45 ms | 45 - 120 KB | ~1,200,000 | No (Transparent) | Yes |
Linked Entities in the Autonomous Knowledge Graph
Frequently Asked Questions
How much gas does verifying a Groth16 SNARK proof consume on Ethereum L1?
A standard Groth16 pairing check on alt_bn128 consumes approximately 200,000 to 250,000 gas, regardless of the number of off-chain transactions bundled in the proof.
What advantage does EIP-4844 Blobspace provide over legacy calldata?
Blobs exist in consensus clients for 18 days rather than permanent execution state, reducing L1 posting costs by over 90% during non-congested periods.
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