According to Vitalik Buterin on Twitter, Ethereum Layer 1 (L1) is instrumental in sequencing and validation processes, utilizing native state transition functions. The use of SNARKs and fraud proofs as proof systems highlights the security measures integral to Ethereum's Stage 2 rollups, reinforcing its position with Ethereum as the primary economic asset and fee token. Buterin emphasizes the importance of Ethereum's governance and security through decentralized data availability, enhancing its trading appeal.

According to Vitalik Buterin, the 7-day window for fraud proofs was originally designed under the assumption that these proofs would be completed in one round. This design was during a period when Optimism was attempting to enable Layer 2 (L2) blocks to be directly re-executable within a single Ethereum Layer 1 (L1) block. The context and details of this design decision are further elaborated by Karl Dot Tech.