[CONSTITUTIONAL] AIP: ArbOS Version 40 Callisto
AI summary
This proposal, a Constitutional AIP, seeks to upgrade Arbitrum One and Arbitrum Nova to ArbOS 40 "Callisto." This upgrade incorporates recent changes from Ethereum's Pectra network upgrade, specifically EIP-7702 for Externally Owned Accounts (EOAs) to execute smart contract code and EIP-2537 for efficient BLS12-381 elliptic curve operations. It also includes a minor fix for Arbitrum Stylus and EIP-2935 for storing historical block hashes.
If passed, Arbitrum One and Arbitrum Nova will gain new functionalities, including enhanced account abstraction for EOAs and improved cryptographic capabilities, bringing them to feature parity with Ethereum's latest upgrades. This benefits developers and users by enabling more flexible and secure smart contract interactions, with no clear losers.
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[CONSTITUTIONAL] AIP: ArbOS Version 40 Callisto
Type: Constitutional AIP
Abstract
This AIP proposes to upgrade Arbitrum One and Arbitrum Nova to ArbOS 40 “Callisto.” Callisto adds support for relevant Ethereum Execution Layer (EL) changes from Ethereum’s recent Pectra network upgrade (took place on May 7, 2025 at epoch 364032) and includes a minor fix related to Arbitrum Stylus. Among the EL changes introduced are a way for Externally Owned Accounts (EOAs) to execute smart contract code directly from their own addre…