# Getting started with the 3-key vault

## Your 3-key vault is a 2-of-3 multisig wallet. It uses three keys, any two of which are needed to send a transaction. The steps below will walk you through setting up a 3-key vault.

_New to Casa vaults?_ Before diving in, we recommend reading **What is a Multisig Vault?** for a plain-language overview of how your keys work and what to expect from your setup.

### Before You begin

Before starting your vault setup, make sure you have the following ready:

- **A Casa account** If you haven't signed up yet, you can do so at [casa.io](https://casa.io/).

- **The Casa app on your phone** The Casa app is available for iPhone and Android.
  - [Casa app for iPhone](https://apps.apple.com/us/app/casa-keymaster/id1314586706)
  - [Casa app for Android](https://play.google.com/store/apps/details?id=casa.keymaster)
- **A compatible hardware device** If you don't have one yet, or aren't sure which to get, see: [_Choosing a Hardware Device for Your Casa Vault_](https://support.casa.io/knowledge/getting-started-choosing-hardware?hsLang=en)
- **A computer with a supported browser** See: _[Supported Platforms and Hardware Device Firmware](https://support.casa.io/knowledge/supported-platforms-and-hardware-device-firmware?hsLang=en)_ for full system requirements.

### How to Get Started

#### Once you've downloaded the Casa app and logged in to your Casa account (the same email address and password you used to sign up for your Casa membership), you're ready to get started!

#### **Setting up your computer**

While most of time you'll interact with your funds through the mobile app, you do need to have a [compatible hardware device and computer system](https://support.casa.io/knowledge/supported-platforms-and-hardware-device-firmware?hsLang=en) in order to fully set up your vault with your hardware device.

You can prepare to set up your vault by reviewing the following topics:

1. [Browser and desktop requirements for Casa](https://support.casa.io/knowledge/supported-platforms-and-hardware-device-firmware?hsLang=en)
2. [Seed phrases and the mostly seedless setup](https://support.casa.io/knowledge/2.-mostly-seedless-setup-overview-for-the-5-key-vault?hsLang=en)
3. [Basics of digital security hygiene](https://support.casa.io/knowledge/3.-basics-of-digital-security?hsLang=en)

#### **Setting up your hardware devices**

Casa works closely with several leading hardware device manufacturers to ensure your vault is created with the most secure, reliable, and user-friendly device(s).

You'll need to set up your hardware key (initialize the device) prior to adding it to Casa. We have some helpful resources for this in our [Hardware keys](https://support.casa.io/knowledge/hardware-key?hsLang=en) section, depending on which type of hardware device you're using.

1. [Setting up Trezor One for use with Casa](https://support.casa.io/knowledge/setting-up-trezor-one-for-use-with-casa-1?hsLang=en)
2. [Setting up Trezor Model T for use with Casa](https://support.casa.io/knowledge/setting-up-trezor-model-t-for-use-with-casa?hsLang=en)
3. [Setting up Ledger for use with Casa](https://support.casa.io/knowledge/setting-up-ledger-for-use-with-casa-1?hsLang=en)
4. [Setting up Coldcard for use with Casa](https://support.casa.io/knowledge/setting-up-coldcard-for-use-with-casa?hsLang=en)
5. [Setting up Keystone for use with Casa](https://support.casa.io/knowledge/setting-up-keystone-for-use-with-casa?hsLang=en)
6. [Setting up Passport for use with Casa](https://support.casa.io/knowledge/setting-up-passport-for-use-with-casa?hsLang=en)
7. [Setting up YubiKey for use with Casa](https://support.casa.io/knowledge/setting-up-yubikey-for-use-with-casa?hsLang=en)

Once you've reviewed the above documentation and initialized your hardware devices, you're ready to set up Casa Pay and your vault.

**Setting up your Casa Pay and 3-key Vault**

See: **[Casa Pay](https://support.casa.io/knowledge/casa-pay?hsLang=en)**

See: **[Setting up your 3-key vault for Bitcoin (BTC)](https://support.casa.io/knowledge/setting-up-your-3-key-vault-for-bitcoin-btc?hsLang=en)** and **[Setting up your 3-key vault for ethereum (ETH)](https://support.casa.io/knowledge/setting-up-your-3-key-vault-for-ethereum-eth?hsLang=en)**