> For the complete documentation index, see [llms.txt](https://token-swap-manual.gitbook.io/token-swap-manual-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://token-swap-manual.gitbook.io/token-swap-manual-docs/what-is-blast-bridge-and-how-does-it-work-before-shutdown.md).

# What is Blast bridge and how does it work before shutdown?

Blast bridge can return supported assets from Blast to Ethereum if you complete the withdrawal steps on both networks. As of 20 October 2026, Blast is winding down, and its normal withdrawal interface is scheduled to close on 26 October. If you already hold assets on Blast, the practical task is to move them back and finish the claim on Ethereum.

### What does the bridge do now?

The bridge now serves people withdrawing from Blast, an Ethereum layer 2, to Ethereum mainnet. A layer 2 processes transactions on its own network while using Ethereum for settlement. Blast previously accepted deposits in the other direction, but its current bridge screen asks users to bring their assets back to Ethereum.

The bridge to Blast originally credited supported assets on the layer 2 after a deposit on Ethereum. For a withdrawal, the [Blast bridge](https://blastbridge.org) records your request on Blast, then lets you prove and claim it on Ethereum. Think of a checked bag: handing it over creates a record, but you still need to collect it at the other end. A successful first transaction does not mean the asset has reached your Ethereum wallet.

Blast’s 2 October shutdown announcement says the normal interface will be available until 26 October 2026. After that, assets are expected to remain withdrawable through direct interaction with bridge contracts on Ethereum, a more technical process. I would use the interface now and leave time to finish every step before it closes.

### Which assets and wallets can withdraw?

The current withdrawal instructions cover ETH, WETH, USDB and BLAST, but the asset received on Ethereum depends on what you hold. ETH returns as ETH. WETH, or wrapped ETH, must first be unwrapped to ETH on Blast; the bridge does not include WETH in the ETH amount it shows as available.

USDB returns as DAI on Ethereum and needs an extra claim after the main withdrawal is finalized. BLAST returns as BLAST; it is a token, distinct from the ETH used to pay transaction fees. Blast’s *Withdraw to Ethereum* documentation gives these asset mappings, so check the receiving asset before you begin rather than assuming its name will stay the same.

The normal Blast bridge interface is intended for a regular wallet that you control and can use on both networks. It sends the withdrawal to the same wallet address on Ethereum. If funds are in a smart contract wallet, such as a shared treasury, that interface cannot withdraw them; the contract withdrawal instructions require a different procedure.

### How do you withdraw to Ethereum?

You withdraw by starting the transaction on Blast, proving it on Ethereum, waiting through the challenge period, and making the final Ethereum claim. A *proof* is the information Ethereum uses to check that the Blast withdrawal was recorded. Keep access to the same wallet throughout, because the steps happen at different times.

Before starting, make sure that wallet has a little ETH on Blast for its first transaction and ETH on Ethereum for the later ones. Leave enough ETH on Blast for gas, the fee paid to process a transaction, rather than entering your entire balance. If you are withdrawing BLAST, you may first see an *approval* transaction that permits the bridge to transfer the amount you selected.

Connect the wallet, choose Withdraw, select the asset and amount, and confirm the withdrawal while the wallet is on Blast. Check the asset, amount and destination shown before signing. The Blast withdrawal bridge then shows the request in History; save its transaction record so you can find it again if you close the page.

When the interface prompts you, switch the same wallet to Ethereum and select Prove Withdrawal. Blast’s instructions say this option may take up to an hour to become available. Confirm the Ethereum transaction, then return after the one-day challenge period and use the enabled Claim Withdrawal or Finalize Withdrawal button in History.

For ETH, claiming completes the withdrawal. For BLAST, finalizing delivers the token; if the wallet does not display it, check its Ethereum token balance before starting another withdrawal. For USDB, finalizing begins a further processing step: wait until Claim Withdrawal becomes available, which may take up to another day, then claim the DAI.

### How long does it take, and what does it cost?

An ETH or BLAST withdrawal takes roughly a day after proving, plus the initial wait of up to an hour and the time needed to submit transactions. USDB can take up to another day after finalization before DAI can be claimed. The one-day wait is a challenge period built into the withdrawal process; paying more gas does not remove it.

You pay gas separately on Blast and Ethereum, and Ethereum is usually the larger part of the bill. Blast’s instructions count one Blast transaction and two Ethereum transactions for ETH, with an additional Blast approval possible for BLAST. USDB needs three Ethereum transactions because its DAI claim is separate. Wallet gas quotes change with network demand, so review each quote before confirming.

For example, withdrawing 100 USDB does not mean that DAI appears after one click or that you can use the full 100 USDB to pay fees. You need ETH in the wallet on Blast to start and ETH in that same address on Ethereum to prove, finalize and claim. That distinction matters most when a wallet contains only USDB or BLAST.

### What if your funds are elsewhere or you miss the deadline?

First move funds held inside an app or position back to a supported asset in a wallet you control on Blast. A balance deposited in a lending position or liquidity pool will not appear as withdrawable ETH or USDB until you exit that position. Check for any resulting WETH and unwrap it before trying to withdraw it as ETH.

Blast Mobile needs an additional transfer: withdraw funds from its Earn app if applicable, then send them on the Blast network to a separate regular wallet before using the bridge. Blast’s Mobile withdrawal documentation warns against sending the resulting Ethereum assets to the Mobile address, which is built for Blast. The separate wallet also needs ETH on both networks to complete the steps.

If the 26 October interface deadline passes, the Blast bridge contracts are expected to remain available, but completing a withdrawal will require direct contract interaction. A withdrawal already started still needs its remaining proof or claim steps; check its recorded status rather than starting it again. The useful rule is simple: identify the asset you will receive, fund gas on both networks, and treat the withdrawal as finished only when it appears in your Ethereum wallet.