> For the complete documentation index, see [llms.txt](https://derpdex.gitbook.io/home/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://derpdex.gitbook.io/home/getting-started/bridge/opbnb.md).

# opBNB

*opBNB* is an optimized layer-2 solution within the *BNB* ecosystem. BNB has introduced the support of bridging assets between BNB and opBNB ( L1 ↔️ L2 ).

In contrast, DerpDEX supports BNB and opBNB ( L1 ↔️ L2 ) bridge. See more below.

BNB native token such as BNB or any BEP20 can be bridged from or to opBNB (L2) . User can perform the following:

* BNB to opBNB ( L1 → L2 ) - (Deposit)
* opBNB to BNB ( L2 → L1 ) - (Withdraw)

{% embed url="<https://app.derpdex.com/#/bridge>" %}

<figure><img src="/files/ASUaGkFhceMpepH1CdAU" alt=""><figcaption><p>Navigate to Bridge</p></figcaption></figure>

<figure><img src="/files/jZyLZTQ31Dua4AAqPaGg" alt=""><figcaption><p>Connect Wallet</p></figcaption></figure>

## **Deposit ( BNB** → **opBNB )**&#x20;

1. To Deposit, head over to the Bridge and select deposit. Make sure to switch to BNB Smart Chain mainnet. You may select a token and input the amount to deposit to opBNB.

   <figure><img src="/files/LE2Uos63UHOmo9MbZSeZ" alt=""><figcaption></figcaption></figure>

   * \[Note: Depositing an asset from BNB to opBNB may take up to 5 minutes]
2. To proceed with an amount specified, click on Deposit to engage with the transaction in your wallet and confirm transaction.

   <figure><img src="/files/5etjuxOMg9Wq2rWOYdSt" alt=""><figcaption></figcaption></figure>
3. The transaction will get confirmed in about 5 minutes and the token will be received on opBNB chain.
4. You may view the transaction of bridged token result as below:

   <figure><img src="/files/RKXDYXQRASYDyQEFDX2w" alt=""><figcaption></figcaption></figure>

## **Withdraw ( opBNB** → **BNB )**

1. To Withdraw, head over to the Bridge and select Withdraw. Make sure to switch to opBNB mainnet and input the amount to withdraw.

   <figure><img src="/files/YRVgHxDTwuS5Yh6wqPxV" alt=""><figcaption><p>Withdraw</p></figcaption></figure>
2. Click on Withdraw and then confirm the transaction on the wallet.

   <figure><img src="/files/LKL4iJ0gmCOn7MJks2KJ" alt=""><figcaption></figcaption></figure>
3. Note that opBNB requires up to 7 days of withdrawal to BNB (L1).&#x20;
   * Consider the status of the withdrawal process:
     * Pending: The state of withdrawal is still in challenge period
     * Prove: The withdrawal is ready to be proved on L1 (BNB)
     * Finalize: The withdrawal is ready to be finalized and to receive the token
4. Example of Prove and Finalized Withdrawal will be listed at the bottom of the panel:

   * **Prove Withdrawal**

     <figure><img src="/files/wMMxNh8yQtxpYOv9FWGR" alt=""><figcaption><p>Prove Withdrawal</p></figcaption></figure>

     User required to prove the withdrawal before proceed to finalize the transfer of withdrawal process.
   * **Finalize WIthdrawal** (After Withdrawal Proven)

     <figure><img src="/files/7PabZEFIPw8b3RTXrkiv" alt=""><figcaption><p>Finalize Withdrawal</p></figcaption></figure>

     Upon confirming the finalize withdrawal, the token will be transferred to the respective recipient.

   Read: More about [Optimism Rollup](https://blog.oplabs.co/two-step-withdrawals/) on Bridge