Use the Blast bridge’s native withdrawal when its one-day challenge period fits your deadline; choose a fast exit only if a live quote covers your asset, amount, and required arrival time. Start the Blast bridge withdrawal by selecting the asset, then budget for proving and claiming on Ethereum. The Blast L2 bridge interface is scheduled to close after October 26, 2026.
Blast bridge withdrawals have a one-day challenge period
Blast’s current native ETH withdrawal has a one-day challenge period after the Ethereum proof, plus up to an hour before that proof is ready. The seven-day figure in older material is outdated, and one day is not the full time from starting a withdrawal to receiving spendable ETH.
A transaction on Blast starts the withdrawal. Once its output is available on Ethereum, the user proves it, waits through the challenge period, and submits a claim transaction on Ethereum. Reserve ETH for gas on both chains: an ETH withdrawal requires two Ethereum transactions after the Blast transaction.
Fast exits trade a fee for earlier Ethereum funds
A fast exit can pay from a provider’s Ethereum inventory before slower settlement finishes. Compare a live quote for the exact asset and amount, using these four checks:
- Asset and payout token
- Available amount and total cost
- Arrival time and fallback
- Ethereum completion event
Asset and payout token. Confirm what leaves Blast and what arrives on Ethereum. The native route requires WETH to be unwrapped to ETH first, while a native USDB withdrawal pays DAI on Ethereum; a fast route may use a different payout token or add a swap.
Available amount and total cost. Check that the quote covers the whole withdrawal and compare the amount delivered after fees, spread, and gas. For example, a 0.3% charge on 10 ETH is 0.03 ETH before gas; the native route instead requires Ethereum gas for its proof and claim.
Arrival time and fallback. Record the quote’s expiry, minimum received, and handling of an unfilled transfer. During Blast’s wind-down, a fast route that worked previously may stop quoting or cover only part of the amount.
Ethereum completion event. Check whether the recipient is paid by a fast fill or by the native claim. Mark a fast transfer complete when its Ethereum payout confirms, not when the transaction on Blast confirms.
Integrations must track the claim through the cutoff
Track initiated, proof-ready, proved, claimable, and claimed as separate native withdrawal states. A common mistake is showing “complete” after the Blast transaction and starting a fixed one-day timer there; instead, use the actual proof and claim status.
USDB takes longer: after the one-day challenge period, the user finalizes on Ethereum, waits up to another day for processing, then claims DAI. Smart contract wallets cannot use the ordinary bridge website flow and need contract-based withdrawal handling. Blast says the normal interface is available through October 26, 2026; after that, withdrawal requires direct interaction with its Ethereum bridge contracts.
If fast liquidity disappears or its quoted payout is too small for the time saved, choose the native route and plan every remaining Ethereum transaction. If the withdrawal will extend past the interface cutoff, account for the direct contract path before promising a completion date.