Arbitrum Activates ArbOS 61 Elara With Compliance Filters
Prefer us on GoogleArbitrum activated ArbOS 61 Elara on August 20, introducing optional transaction screening, priority-fee support, and an alternative data-availability interface for dedicated chains. The upgrade, approved through Arbitrum governance, includes compliance and priority-fee capabilities but leaves them disabled on Arbitrum One and Nova. Compliance filtering is off by default, requiring chain owners to configure it. Owners can select external compliance providers like TRM Labs or Chainalysis to create restricted-address lists and define rules for transactions. Enforcement occurs at two levels: the sequencer rejects transactions violating rules before block inclusion, and a sentinel can register transaction hashes to prevent restricted users from bypassing the sequencer. Elara allows dedicated-chain owners to collect priority fees, but this feature is also disabled by default and requires activation by the chain owner. Collecting tips does not alter transaction ordering; chains must update sequencer logic for that. Elara introduces a BaseFeeManager contract for adjusting the minimum Layer 2 base fee within a DAO-approved range of 0.01 to 0.10 gwei, with delegation expiring two years post-activation. The alternative data-availability API is designed for dedicated chains, while Arbitrum One's transaction data settles on Ethereum. Elara increases the code-size limit for Stylus contracts from 24 KB to 96 KB, not affecting Solidity contracts.
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