Constitutional

Abstract

This AIP proposes a number of improvements to Arbitrum chains, including the capability to leverage EIP 4844 to post batches of L2 transactions as Blobs on L1 Ethereum at a cheaper price. The proposal also includes support for most of the changes included in Ethereum’s Dencun upgrade. The proposed ArbOS 20 “Atlas” upgrade will be ready for adoption by any Arbitrum Chain; this proposal concerns the Arbitrum One and Nova chains, as they are governed by the Arbitrum DAO. On a high level, an ArbOS upgrade can be seen as Arbitrum’s equivalent of a hard fork - more can be read about the subject over in Arbitrum ArbOs upgrades .

Please note that ArbOS Version 20 “Atlas” is an upgrade that builds upon ArbOS version 11 which has been adopted by the ArbitrumDAO - this proposal increments the version number to 20 instead of 12 due to technical details that allow for better Orbit chain customizability.

Please review the forum post for a full description of changes included