What are the L2 public chains?
Mainstream L2 can be divided into two categories based on technical routes: Optimistic Rollup and ZK-Rollup, along with sidechain solutions (some classified as generalized L2).
1. Optimistic Rollup (OP series)
Arbitrum: Ecological leader, leading in TVL and user count; includes Arbitrum One (mainnet), Arbitrum Nova (low fee), and the Nitro stack enhances performance.
Optimism: OP Stack core, promoting cross-chain interconnectivity of the "superchain", ecosystem and developer friendly.
Base: Launched by Coinbase, it has rapidly growing users and transactions, conv

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