General information and notes
With a signed message, you prove that you are the owner of a specific Bitcoin address.
The procedure described here applies to BitBox02 – we currently recommend using the web portal.
Only use the QR codes and data from your own wallet or from your Coinfinity account—not those from this guide.
To make a sale, it is mandatory to add an extended public key (XPUB, YPUB, or ZPUB).
None of these steps are necessary for purchases and sales in the Coinfinity in-app wallet.
Step 1 – Login
Log in to Coinfinity on the web portal: https://login.coinfinity.co
Once you are logged in, please go to the “My Wallets” tab. If you have already created an in-app wallet, it will already be listed there.
To add the external wallet and then confirm, proceed to step 2.
Step 2 – Add and confirm wallet
At the top of the screen, you will find the “Add Wallet” button. Click on it and then select one of the listed options. It is possible to add hardware wallets or software wallets. You can theoretically add addresses from other exchanges or custodial wallets, but you will not be able to confirm them later.
These instructions refer to a BitBox02 wallet. Links to the other instructions can be found HERE.
A selection field will open. Select “BitBox” to continue. For “BitBox,” we currently recommend using the web portal rather than the smartphone app.
The following window opens:
At BitBox, we use the AOPP process, which ensures that you can add and confirm your wallet or address in just a few clicks.
Connect your BitBox, open the BitBox app on your computer, and unlock the hardware wallet with your wallet password.
Then click on the “Continue in the BitBox app” button in the Coinfinity portal.
PLEASE NOTE: Unfortunately, we do not currently support Taproot addresses, but we are working on offering this as soon as possible.
A window will open in the BitBox app displaying the address request from the Coinfinity Portal website. Click on “Continue” here.
The BitBox app will then prompt you to sign the automatically transferred message. To do this, you must confirm the signature directly on your BitBox. Check that the message (random 10-digit character string) is identical. Then follow the instructions on your hardware wallet to sign.
Once this is done, the screen “Address successfully transmitted” will appear in the BitBox app. Click on “Done” here.
In the next step, give your wallet a name. It is best to choose a name that will allow you to clearly identify which of your devices it is later on.
If you want to confirm the entire public key (which we recommend for several reasons), you can now paste it into the “Share your XPUB” field. If you do not want to do this, skip the following step and click directly on “Save.”
Go to the BitBox app and select the appropriate account.
Then go to “Account Information” at the top.
A window will open displaying the public key as a QR code and in the form of a character string. Press the “Copy” button (see image) and paste this character string into the Coinfinity Portal.
Once you have entered the string in the Coinfinity portal, click on “Save.” Your wallet has now been successfully confirmed and added!
If you see an error message, there was an error in one of the intermediate steps. In any case, try again and make sure you follow the steps exactly.
Step 3 – Security clearance via email
After you have added your wallet—regardless of whether you sign it immediately or add the signature later—we will automatically send you an email with a six-digit confirmation code.
ATTENTION: This verification is required for every external wallet you register with Coinfinity. You cannot use the wallet without entering this code.
The code is valid for 10 minutes. Before entering the code, you must confirm that the wallet is a self-hosted wallet. To do this, check the box in the interface.
Then enter the six-digit code from your email into the input field.
Click “Add Wallet” to complete the process.
After successfully signing and confirming your wallet, you will see all signed wallets or addresses listed in the “My Wallets” menu. You can now choose from the confirmed wallets/addresses for each purchase.
IMPORTANT: If you interrupt the code entry process, the wallet will still be displayed in your overview, but will remain listed as “Waiting for code.”
If you decide to use the wallet a little later, you will need to request a new code, as the original one will have expired after 10 minutes.
If you receive an error message during the process, check the code or request a new one if necessary.