The technical architecture of Arbitrum and zkSync reflects their respective approaches to scaling Ethereum. Arbitrum’s architecture is based on the Optimistic Rollup, which processes transactions off-chain and posts aggregated data on-chain for verification. This involves validators challenging any incorrect transactions through a multi-round fraud-proof process, ensuring secure and efficient transaction processing. zkSync’s architecture employs zk-Rollup technology, which also processes transactions off-chain but uses zero-knowledge proofs to validate the correctness of transaction batches on-chain. This design allows zkSync to provide immediate finality and high security, as the proofs are mathematically verifiable. Both architectures aim to improve scalability and reduce gas fees, but zkSync’s use of zero-knowledge proofs offers an additional layer of cryptographic assurance, making it extremely difficult for any incorrect transactions to pass through undetected. Arbitrum’s fraud-proof mechanism provides robus