Can I upload multiple keys from just one hardware wallet?

Yes, but it requires some advanced know-how.

If you need to, you can always use your two existing keys to create multiple vaults and loans in your Unchained account. Separately, you can also upload multiple keys from your hardware wallets if you want to use the same devices but different keys for your personal and retirement/business accounts, for example. 

Note: If you want to create multiple vaults on the same account, you don't need to follow these steps. To do that, simply create more vaults!

How to upload multiple keys from a single wallet

If you want to upload multiple keys using the same hardware wallet, you will have to change the BIP32 path.

  1. Log in to your Unchained account.
  2. Upload a new account key by clicking New under Keys.
  3. In the Export extended public key section, click the Show advanced button in the right-hand corner. This allows you to specify your BIP32 path. 
  4. Enter a BIP32 path that has not been used yet. You can change the BIP32 path by changing the third depth number. (You can choose m/45'/0'/1' if it's the second time you're uploading a key from the same device (m/45'/0'/0' being the first used.)
    • Note for Coldcard users: When exporting your xpub, the Coldcard will ask you to enter an "account number."  Always enter 0 for the account number, even when changing the BIP32 derivation path.
  5. Proceed with the key upload as normal.
  6. That's it! You've added another key using one hardware device.

Warning: Adding another key from one device will allow you to use the same hardware wallet in different account contexts, but note you will always need to update the BIP32 path to use these keys. If you lose or forget this information, it's possible you could lose access to your funds. Be sure to always properly back up your wallet config file for each vault you create, regardless of whether you use non-standard BIP32 paths.