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ZK-Rollups Mastery Hub: The Industry Foundation Practice Tes

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Q1Domain Verified
In the context of ZK-Rollups, what is the primary mechanism by which a validity proof (e.g., SNARK or STARK) ensures the integrity of off-chain computations without requiring every node to re-execute them?
The proof attests to the correctness of the state transition function applied to the previous state root, generating a new state root.
A multi-signature scheme where a supermajority of validators cryptographically sign off on the validity of the batch.
Zero-knowledge proofs enable the prover to demonstrate knowledge of a valid execution trace without revealing the trace itself, thus verifying the state update.
Cryptographic hashing of transaction data, allowing for efficient verification of data availability.
Q2Domain Verified
A key challenge in ZK-Rollup design is ensuring data availability for potential verifiers and sequencers. Which of the following strategies most effectively addresses this, particularly in a scenario where a malicious sequencer might withhold data?
Publishing compressed transaction data to L1, ensuring that at least one full node on L1 can access and verify the data.
Implementing a "data availability committee" (DAC) composed of independent validators who attest to the availability of the data posted to L2.
Relying solely on the rollup's internal state, which is accessible on the L1 smart contract, to reconstruct transaction data.
Posting compressed transaction data or state diffs to L1, coupled with mechanisms like fraud proofs or data availability sampling (DAS) to incentivize availability.
Q3Domain Verified
Consider a scenario where a ZK-Rollup operator wants to minimize L1 gas costs for batch submission. Which of the following proof systems would generally offer the most significant reduction in proof generation time and verification complexity, albeit potentially at the cost of larger proof sizes?
STARKs
PLONKish SNARKs (e.g., Marlin, Halo 2)
Bulletproofs
Groth16 SNARKs

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