Casa App (formerly Keymaster) is an advanced personal multisig key manager.
This multisig Bitcoin key manager, built and maintained by Casa, adds layers of security and peace-of-mind to your Bitcoin holdings. With Casa, you can sleep soundly knowing your bitcoin are secure.
Casa App comes in multiple membership levels:
SILVER - Single Key Wallet
GOLD - Single Key, plus Mobile Key/Hardware Device Key/Casa Recovery Key (Basic 2 of 3 multisig)
PLATINUM & DIAMOND - Single Key, 3x Hardware Device Keys, Casa Recovery Key (Advanced 3 of 5 multisig)
With Silver's Single Key (1 of 1), you have a Single Key (not multisig) that is stored on your phone and can be used for receiving, storing, and sending small amounts of bitcoin for everyday use.
Only this single mobile key is needed to spend funds from the app.
The Single Key is encrypted and backed up seamlessly to Apple (for iPhone users) or Google (for Android users)
With Gold's basic multisig (2 of 3) - In addition to the Single Key, you have a separate Mobile Key (stored on your phone), a Hardware Device Key (a Trezor or a Ledger), and Casa's emergency recovery key. You can optionally add a second Hardware Device Key in place of the Mobile Key.
Two of these three keys are needed to spend funds.
With Platinum and Diamond's advanced multisig (3 of 5) - In addition to the standalone Single Key, you have a separate Mobile Device key (your phone), three Hardware Device Keys (Trezor or Ledger), and Casa's emergency recovery key. You can optionally add a fourth Hardware Device Key in place of the Mobile Key.
Three of these five keys are needed to spend funds.
Since you need multiple keys to spend funds from your Casa wallet, the key that Casa holds for emergency recovery cannot by itself be used to spend funds. This way, you don't need to trust Casa, but can still use Casa to help you spend funds in the unlikely event that you lose access to your own key(s).
You can learn more about Casa and our memberships here.
Have the Casa App downloaded, and are ready to get started? See our setup guide.