According to @alice_und_bob, Layer 2 (L2) teams can address common scaling and security challenges—such as the need for zk proofs, fraud proofs, 7-day exit windows, and alternative data availability bridges—by utilizing Polkadot core technology instead of more complex or resource-intensive solutions. This highlights Polkadot’s (DOT) potential as a scalable, cost-effective platform for developers, which could increase demand for DOT and impact its price performance in the crypto market. Source: @alice_und_bob.

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.