This guide will walk you through every step of securely sending a Bitcoin transaction using your BitBox02 and the BitBoxApp.
Setup Section:
Before you begin, make sure of the following:
- Your BitBox02 is already set up. If not, please follow our setup guide first. Link to Set up your BitBox02.
- You have a sufficient Bitcoin balance to cover the amount you wish to send plus the network transaction fee.
Prepare the transaction in the BitBoxApp
The first steps take place in the BitBoxApp on your computer.
Choose your account and enter details
- In the left sidebar of the BitBoxApp, select the Bitcoin account you want to send from.
- Click the Send button in the right side.
- In the recipient field, paste the address you want to send to. You can also click the QR code icon to scan an address using your device's camera.
- Enter the amount you wish to send. You can toggle between entering the amount in BTC or your local fiat currency.
- Choose a transaction fee. A higher fee will result in faster confirmation on the blockchain. If you are not in a hurry, you can choose a lower fee. We recommend using a tool like mempool.space to check current fee recommendations.
- Optionally, you can add a private note to the transaction for your records.
- Once all details are entered, click the Review button.
Special options: Coin control feature
If you have the Coin Control feature enabled, you will see an option to manually select which of your coins (UTXOs) are used for this transaction. You can find more details in our guide: What is Coin Control and how to use it
"Send all" option
Be careful when using the Send all option. This will send the entire balance of the selected account or, if Coin Control is active, the entire balance of the selected UTXOs.
Verify and confirm on the BitBox02
This is the most critical step for security.
- You must now carefully verify all transaction details (recipient address and amount) on your BitBox02 screen.
- Always trust the screen of your BitBox02 over your computer screen. Your computer could be infected with malware that alters the display in the app, but the BitBox02 screen is secure.
- Once you are certain all details are correct, confirm the transaction on your BitBox02.
After confirmation
Once you confirm on the device, the transaction is broadcast to the Bitcoin network. The BitBoxApp will show the transaction as "Pending".
"Pending" means the transaction has been sent but is waiting to be confirmed by miners and included in the blockchain. The time this takes depends on the network congestion and the fee you selected. You can now safely close the BitBoxApp and disconnect your BitBox02.
If you find your transaction is taking too long to confirm, you may be able to speed it up using a feature called Replace-By-Fee (RBF). This can be done by connecting your BitBox02 to a compatible wallet like Sparrow. Learn more in our guide: How to speed up a stuck transaction with Sparrow Wallet
Video guide
Here we’ve also created a video guide:
Note that the video may differ in some respects due to several updates to the app and optimizations.
Frequently Asked Questions (FAQ)
Can I cancel a Bitcoin transaction?
No. Once a transaction is confirmed on the BitBox02 and broadcast to the network, it is irreversible and cannot be canceled.
Can I speed up a pending Bitcoin transaction?
Yes, this is often possible using a feature called Replace-By-Fee (RBF), which replaces your original transaction with a new one that has a higher fee. You can do this by connecting your BitBox02 to a compatible software wallet like Sparrow. For detailed steps, see our guide here: How to speed up a stuck Bitcoin transaction with Sparrow and BitBox02
What happens if I choose a fee that is too low?
If the network is busy, a transaction with a very low fee might take a long time to confirm or could get stuck. Using a fee estimator like mempool.space can help you choose an appropriate fee.
Why do I have to verify the address on the BitBox02?
This is a critical security measure. Malware on your computer can change a copied address "in the background". What you paste into the BitBoxApp might not be the address you copied. The BitBox02 screen shows you the true destination address you are signing for.