💜Casa vs. Alternatives
🔑System Design Principles
🚨Threat Overview
🔐Chosen Features
✅Chosen Key Schemes
❌Rejected Key Schemes
❌Rejected Features
🔧Remaining Attack Vectors
👨🚀Future Improvements
Seedless Hardware Wallets
Most bitcoin wallets ask you to write down a recovery seed and keep it secure when you set up the wallet for the first time. Underlying that seemingly simple instruction is an ocean of complexity. Keeping a recovery seed secure requires expertise and can be a labor-intensive and costly process. If mistakes are made, a recovery seed can make a wallet less secure, since the seed can be used to clone the wallet.
We decided not to rely on manually backed up recovery seeds. Instead, the Mobile Key and Casa Emergency Recovery Key are automatically backed up and the user can decide if they want to back up the seed phrase for a hardware device, but it's not necessary. The Casa App interface makes it easy for a user to swap in a new hardware device for one that is lost at any time. By simplifying the key rotation and wallet sweep process, we have eliminated a whole class of complexity that users have to deal with in other systems.
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