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_fast-withdrawals-pc

Pros​

  • Significantly faster withdrawals and finality: Reduces withdrawal times from days to minutes, improving user experience and enabling quicker asset movement across chains. This is particularly beneficial for cross-chain dApps, as they can read the finalized state at the same accelerated rate.
  • Enhanced capital efficiency: Shorter wait times minimize opportunity costs for users, allowing faster re-deployment of funds and better liquidity in DeFi or other applications.
  • Improved performance for AnyTrust: When combined with AnyTrust mode, Fast Withdrawals leverage existing infrastructure without introducing entirely new trust elements, enabling near-instant withdrawals for non-fungible assets.

Cons​

  • Introduced trust assumptions: Shifts security from the fully decentralized optimistic Rollup model to reliance on a validator committee. For Rollup-mode chains, this means it's no longer a "true" Rollup, as users must trust the committee for fast confirmations. In AnyTrust mode, it assumes at least two honest members in the Data Availability Committee (DAC), which could be a risk if the committee is compromised.
  • Potential delays under high load: High network throughput can cause confirmation delays beyond the configured rate, with a practical minimum of 1-2 minutes in busy scenarios. Initial setup may also slow the chain temporarily due to backlog processing.
  • Setup complexity and requirements: Requires upgrading to specific versions, creating a multi-signature Safe wallet for the committee, and running at least three validators. This adds operational overhead and potential costs.
  • Security trade-offs compared to standard withdrawals: While standard withdrawals maintain full Ethereum-level security via the challenge period, fast withdrawals prioritize speed over decentralization, potentially exposing users to risks if the committee fails or is attacked.
  • Layer 3 setups finality: For chains settling to Arbitrum One or similar and using BoLD, fast confirmations cannot be lowered below 15 minutes.