A few days ago, @arbitrum_cn and @arbitrum just completed their own Pectra upgrade, codenamed ArbOS 40 Callisto. We actually talked about this before, which is the issue of how L2 and ETH L1 maintain synchronization.

As we all know, the Pectra upgrade of ETH L1 went live on May 7, but just because L1 has it doesn't mean that L2 will automatically have these new features.

Therefore, L2s like Arb also need to push their own Pectra upgrades to ensure that they always maintain a consistent user experience with ETH L1.

Of course, some proposals in the Pectra upgrade, such as the node limit in the Staking module being raised from 32 to 2048, are not useful for Arb.

However, there are still some proposals: for example, EIP-7702: smart wallet account abstraction; EIP-2537: on-chain BLS signatures, etc. These EIPs are quite important for Arb.

Currently, the leading applications on Arb are focused on Perps, such as GMX, Ostium, Aark, and Rho. Arb should also need some other types of applications to change the game.

Once account abstraction goes live, it can enable gasless transactions, batch transactions, social registration, etc., which are all solutions to the last mile problem.

Then there's the on-chain BLS signatures, which can be used to achieve faster and cheaper BLS signatures and zero-knowledge proofs. Although L2 is already cheap and fast enough, it can still be faster and cheaper.

I remember that someone previously mentioned that you could run an L2 for $50, but that was just the most basic L2.

If you want to run a good L2, you still need to put in a lot of effort to maintain it. The upgrades from the ETH L1 mainnet require L2 to redevelop, retest, and re-audit, which all incurs costs.

Otherwise, some tail-end L2s may feel neglected if they do not keep up with every mainnet update, which could make them feel like dilapidated buildings from the crypto-punk era.