ChainCatcher report, according to The Defiant, Arbitrum activated the ArbOS 61 Elara upgrade on August 20, introducing optional protocol-level transaction filtering, priority fee support, and alternative data availability interfaces 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 actively configure external compliance service providers (such as TRM Labs or Chainalysis) and set rules, enforced through both simulated transactions and on-chain guardianship mechanisms. The priority fee feature is also disabled by default and must be enabled by chain owners via a precompile. Priority fee collection on Arbitrum One still requires a separate DAO vote. Elara also introduces the BaseFeeManager contract, allowing Offchain Labs to adjust the base fee within a DAO-approved range of 0.01 to 0.1 gwei for a two-year period. The Stylus contract code size limit has been increased from 24KB to 96KB, but this does not apply to Solidity contracts.
Arbitrum Activates Elara Upgrade, Adding Optional Compliance Filters and Priority Fee Support
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Summary
Arbitrum activated the ArbOS 61 Elara blockchain upgrade on August 20, introducing optional crypto compliance filters, priority fee support, and a new data availability interface. The compliance feature requires external providers such as TRM Labs and is disabled by default. Priority fees must be enabled via precompiles. On Arbitrum One, a DAO vote is still required to enable fee collection. The upgrade includes a BaseFeeManager contract, allowing Offchain Labs to adjust fees between 0.01 and 0.1 gwei for two years. Stylus contract size limits have been increased to 96KB, excluding Solidity.
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