zkSync Era: ZK-Rollup Economics and Investment Brief

Frequently Asked Questions

01.What is zkSync Era and how does it differ from optimistic rollups?

zkSync Era is a ZK-rollup Layer 2 built by Matter Labs that submits STARK validity proofs to Ethereum mainnet, achieving near-instant withdrawal finality. Unlike optimistic rollups, which impose a 7-day challenge window for fraud proofs, zkSync Era settles state transitions cryptographically. This eliminates the withdrawal delay that constrains capital deployment on competing networks and removes the need for fraud-proof watchers.

02.What is the Boojum prover and why does it matter for sequencer economics?

Boojum is the STARK-based proving system Matter Labs deployed in July 2023, replacing the prior SNARK-based prover. It reduced the hardware RAM requirement for running a prover node from 80 GB to 16 GB, an 80 percent reduction in compute overhead. Lower prover costs compress sequencer operating expenses, improving fee margins and making it economically viable for additional operators to run proving infrastructure.

03.How does EIP-4844 affect the investment case for zkSync Era?

EIP-4844 was under active development through 2023 but had not yet activated on Ethereum mainnet as of January 2024. Once live via the Dencun upgrade targeted for early 2024, it is projected to reduce Layer 2 data-posting costs by 10x to 100x via blob-carrying transactions. For zkSync Era investors, this represents the primary near-term sequencer margin catalyst, compressing operating expenses and improving fee competitiveness for high-frequency DeFi protocols.