The Casa app allows you to use keys stored on hardware devices to sign transactions for your vault, easily and securely.
Since Casa is a software and service experience, we work closely with leading hardware device (sometimes referred to as "hardware wallet") manufacturers to ensure your keys are stored with the most secure, reliable, and user-friendly devices.
The hardware devices that we currently support with Casa multisig are:
- Trezor One
- Trezor Model T
- Ledger Nano S/S+
- Ledger Nano X
- Coldcard Mk3+
You can find instructions for setting them up on the manufacturers' respective websites, but their guides are primarily designed for users who will be using them to store standalone single keys. The primary difference is the importance of security features like seed phrases, and to a lesser extent PIN codes.
Seed phrases are a physical copy of your private key. Before multisig, any loss of a key meant that funds were gone forever, so hardware manufacturers work hard to ensure that users create backups.
The challenge of seed backups is they make security a lot more complicated. With Casa, any lost key can be replaced with a new one rather than restored from backup, as long as the other keys remain intact. For the 3-key vault, we consider keeping a copy of the seed phrase optional. For the 5-key vault, we recommend keeping a copy of only one seed phrase.
Similar to seed phrases, hardware manufacturers implement PIN protection on their devices to protect against physical theft of the device. Some go as far as to wipe the device automatically after a certain number of incorrect guesses to prevent a brute force attack.
PIN protection is far less important in a multisig setup, since the theft of a single key will not compromise funds. A bigger concern is forgetting the PIN, which can lead to inadvertent key loss. For this reason, we encourage clients to use the same simple, memorable PIN on all their devices, and back it up to a password manager.
If you're using multiple hardware devices in your setup, we recommend using the same PIN code across all your devices.
Hardware setup support
Having issues? Get top-level support from our experts by emailing firstname.lastname@example.org.
Select your hardware device below for a full guide on how to set up each device for use with Casa: