Arbitrum Activates Elara Upgrade, Adding Optional Compliance Filtering and Priority Fees for Dedicated Chains

August 21 news, according to The Defiant, Arbitrum activated the ArbOS 61 Elara upgrade on August 20, adding optional protocol-level transaction filtering, priority fee support, and an alternative data availability interface for dedicated chains, while adjusting base fee management on Arbitrum One and expanding Stylus contract capacity. The compliance filtering feature is disabled by default and requires chain owners to proactively configure external compliance service providers (such as TRM Labs or Chainalysis) and set rules, enforced through dual mechanisms of transaction simulation and on-chain guardian measures. The priority fee feature is also disabled by default and requires chain owners to enable it via precompiles. Collecting priority fees on Arbitrum One still requires a separate DAO vote.