Arbitrum, a prominent Ethereum Layer 2 scaling solution, has successfully deployed the ArbOS 40 "Callisto" upgrade. This major update integrates several key Ethereum Improvement Proposals (EIPs) from Ethereum's recent Pectra upgrade directly into the Arbitrum One and Nova networks, marking a significant evolution in its technology stack.
The upgrade includes EIP-7702 which enables advanced account abstraction by allowing externally owned accounts (EOAs) to execute code during transactions. This feature introduces enhanced user experience capabilities such as paying gas fees in any token, implementing transaction batching, setting spending caps, supporting flexible signature schemes including multi-signature and quantum-resistant signatures, and allowing decentralized applications to sponsor user gas fees.
Additionally, EIP-2537 is included, introducing precompiles for BLS12-381 curve operations. This boosts efficiency for zero-knowledge proof processes and signature aggregation, crucial for a Layer 2 rollup like Arbitrum which processes large batches of off-chain transactions. The upgrade also incorporates EIP-2935, improving smart contracts’ access to historical block hashes, which benefits decentralized applications relying on trustless verification of past states, such as oracles and cross-chain bridges.
The ArbOS 40 update also brings developer-focused improvements, including a Stylus VM fix that enhances Rust-based smart contract performance and reliability. By proactively adopting these Ethereum Pectra features, Arbitrum strengthens its alignment with Ethereum’s roadmap, enhancing scalability, developer tooling, and user experience.
This upgrade positions Arbitrum not only as a leading Layer 2 scaling solution but prepares its ecosystem for the future of decentralized applications with more robust, flexible, and efficient infrastructure.