Layer 1 is decentralized blockchain. Ethereum and Bitcoin are both layer 1 blockchains because they are the underlying foundation that various layer 2 networks build on top of.

Different types of zkevm have made different trade-offs between practicality and speed. There are four different zkEVM types available to choose from.

ZK-rollups publish state data for every transaction processed off-chain to Base Layers.

In a Rollup, the Sequencer is responsible for collecting and packaging user transactions.

The prover is a core component of ZK-Rollup, responsible for generating zero-knowledge proof (ZKP) to ensure the security of user assets.