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Headline: Up to 15 minute withdrawals and cross-chain communication for your Orbit chain

🔗 Key Information & Links

🚀 Launch details

Key timelines & announcements?

• Fast Withdrawals will be released in Nitro and Orbit core smart contracts in mid-August
• Offchain Labs is looking for RaaSes and Orbit chains interested in being part of the initial rollout for the Fast Confirmations / Fast Withdrawals feature

💎 Value & user impact

What is the value proposition? What functionality is being enabled?

Optimistic rollups must sustain a multi-day challenge period to allow time for fraud proofs. This delays finality for users and apps, resulting in multi-day withdrawal times and cross-chain communication delays.

Fast Withdrawals is a new configuration allowing Orbit chains to achieve fast finality. Orbit chains with Fast Withdrawals will have their transactions processed by a committee of validators. Transactions with a unanimous vote across the committee will have their state transition immediately confirmed.

This will allow:

• Orbit chains can configure a fast confirmation frequency (any time up to 15 minutes)
• User withdrawals to are confirmed on the parent chain at frequencies up to ~15 minutes
• Enhanced cross-chain communication by allowing cross-chain apps to read finalized state up to the fast confirmation frequency

Which Orbit configurations can adopt this feature?

While any Orbit chain can adopt Fast Withdrawals, we only recommend Fast Withdrawals for AnyTrust chains.

This is because AnyTrust chains, as an optimium, already have a minimum trust assumption placed in their Data Availability Committee (DAC) - which is for their nodes to provide data availability.

• The optimal set up for an AnyTrust chain is to have all DAC members also run validators as part of the Fast Withdrawals committee, which leverages the existing trust assumption on the DAC. This means enabling Fast Withdrawals does not add any new trusted parties.