ZK-Rollup Reading List

Zero-Knowledge Blockchain Scalability by EthWorks discusses the zk-Rollup approach exceptionally well. Definitely a must-read.

Evaluating Ethereum L2 Scaling Solutions: A Comparison Framework by MatterLabs compares different scalability approaches to scale Ethereum

Understanding rollup economics from first principles breaks down the cost structure. The main culprits are L1 publication costs and L2 operator costs.

zkPorter: a breakthrough in L2 scaling introduces the fractal scaling solution for the off-chain data availability of the zkSync project.

L2 Interoperability: A Comparison Between StarkEx, Loopring, Hermez and Connext discusses the different interoperability methods between said projects, bypassing L1.

zkRollup Directory curates a list of active zk-rollup projects.

L2 Fees compares the costs between L2 solutions.

Short Comparison with Optimistic Rollups

In optimistic rollups, the aggregators publish minimal information, assuming the aggregators generally behave. Proofs are generated once there is a claim about some fraud.

This property generally allows them to operate with lower cost, however the withdrawal process takes quite a bit of time since the protocol needs to give the objectors some time to prepare their case with proofs.