Setting up Trezor One for use with Casa

This article details how to set up (initialize) your Trezor One hardware device for use with Casa.

Trezor devices can be used with both BTC and ETH vaults in the Casa app.

Not a Casa member yet? You can sign up here.

To begin, verify the integrity of the device box to ensure that it is free from tampering.


Once your Trezor One has been unboxed, head over to in your browser. You will have the choice either to download Trezor's desktop app, or use the web suite. Select which version of the app to download based on what type of computer you're using.


We recommend downloading the desktop app. The following instructions are written for the desktop app.


After downloading the desktop app, install it on your computer, open it up, and connect your Trezor One, using the cable provided.


If your device is not recognized once plugged in, head over to to download Trezor Bridge and resolve this issue. Or, if Trezor's page gets stuck "Loading..." please ensure you have cookies enabled for live and/or Incognito mode (depending on which mode you're using).

Next, you'll see a security check, which verifies the authenticity of your Trezor device. Click "Setup Trezor" at this step.


If this is your first time setting up this device, you'll be asked to do a firmware update.

Casa always recommends getting the latest firmware when initializing a device for the first time, before the key is used to secure funds. You can view the latest firmware versions for Trezor here.

Follow the steps to update your firmware if needed.

Next, choose "Create New Wallet," and confirm the action on your device.

Now you’ll need to complete the backup process. Choose "Wallet Backup," confirm the action on your Trezor device, then press "Create Backup." You'll then select "Standard seed backup" in the next window.

During this backup process, you’ll be prompted to write down the 12-word seed phrase.

Casa vaults allow for a fully "seedless" setup, so if you'll be using this Trezor One exclusively with Casa, writing down the 12-word recovery seed is considered optional.

You can write down the seed phrase if you choose to. If you ever lose or break the device, the seed phrase will be able to restore the Casa signing key on a new device. If you don't write it down, though, you can easily rotate your keys to a new device without it.

See: Seedless multisig for more info on this topic and decide what's right for you.

At this step, you can either "Begin Backup," or "Skip Backup" if you choose not to write down the seed phrase.


If you choose to write down your backup, you'll be shown the 12 words on your Trezor device, and write them down.


Next, you’ll set the PIN code on your Trezor. It’s very important that you do not forget this, a lost PIN is a lost key! If you are using multiple hardware devices, we recommend using the same 4-8 character PIN (no zeros) across all your hardware devices, and saving it in a password manager.


To set the PIN, use the mixed number panel (map) on the Trezor One device as a guide to correspond with the blank, dotted squares that appear in the browser to select your PIN. You will enter the PIN twice to confirm.


If you plan to use a BTC vault with Casa, activate the bitcoin app for your Casa setup.

If you plan to use a ETH vault with Casa, activate the ethereum app for your Casa setup.


That’s it! Your Trezor One device is now initialized and ready to be added to your keyset.

You will see the option to name your Trezor if you wish, and change other settings about the device, but this is optional. 


While you won't be using the desktop app going forward (you'll primarily interact with your funds through the Casa app), you may need to open the desktop app prior to adding the device to Casa, or while signing transactions. 

Passphrase protection

Trezor allows to protect your device even further by allowing you the option to set a passphrase in addition to the PIN code. 

In general, we recommend that you avoid setting a passphrase on your Trezor device. Not only is it easy to lose a passphrase that locks you out of your device, we believe the PIN code, along with multisig security, are sufficient protections. 

The passphrase prompt is enabled by default in Trezor suite. If you choose not to enable a passphrase, which is our recommendation, the feature can be toggled off or on via the Device settings page in Trezor Suite. Now would be a good time to do that. 

To disable passphrase prompts (recommended), please see Trezor's article Passphrases and Hidden Wallets and scroll to the section titled Disabling / re-enabling the passphrase feature.

All done with setup!

Finally, keep your Trezor somewhere safe and secret. Though there may not be funds in the wallet yet, keeping it secure and protected from tampering prior to funds placement is very important.

Your Trezor One can now be added to your Casa vault. See Adding Trezor to your Casa vault  for more information about setting up your 5-key or 3-key vault with your Trezor in the Casa app.

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