Arbitrum Activates ArbOS 61 Elara Upgrade on August 20

Arbitrum activated the ArbOS 61 Elara upgrade on August 20, adding optional protocol-level transaction screening for dedicated chains, priority fee support, and an alternative data availability interface. According to Odaily, the upgrade also adjusts Arbitrum One base fee management and expands Stylus contract capacity.The compliance screening feature is disabled by default and requires chain owners to configure an external compliance provider such as TRM Labs or Chainalysis and set rules for enforcement through simulated transactions and on-chain guard mechanisms. Priority fee support is also off by default and must be enabled by chain owners through a precompile, while fee collection on Arbitrum One still requires a separate DAO vote.