Instructions how to set up the Coldcard with the XPub

This is an additional specific instruction to set up your Coldcard with XPub. The full instructions on how to set up the hardware wallet with Pocket can be found here

Pocket is popular for recurring ethereum purchases. Once you set up Pocket, you can reuse your payment details at will to receive ethereum again into your desired wallet.

In this case, so that we don't always have to pay out your ethereum to the same ethereum address, we recommend that you share multiple ethereum addresses with Pocket at once using your public extended key (XPub)

To do this, click on the option to share your entire wallet with Pocket.

To query your XPub, you can export your wallet on your Coldcard via Advanced/Tools -> File Management -> Export Wallet.

When exporting your wallet, select the Generic JSON option and next specify the same account number you used in your derivation path. Make sure that you create a separate account for Pocket. We recommend you to use the account number 1 here.

Once you have exported your XPub to the file coldcard-export.json, you can now copy the xpub from it to the Pocket website. Click on the confirm button.

With each ethereum purchase, your ethereum will now automatically land on a respective unused ethereum address of your Coldcard wallet.

Here you can find the further process how to set up the coldcard with Pocket.