Wealth Security Protocol
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Overview
💜Casa vs. Alternatives
Introduction
Option #1: Do-it-yourself
Option #2: Custodial Storage
Option #3: Commercial Systems
🔑System Design Principles
Introduction
Minimal Knowledge
High Security
Usability is Security
Expert Support
Redundancy
Sovereignty
Incentive Alignment
Bitcoin First
🚨Threat Overview
Introduction
Data and Credential Loss
Phishing
SIM Hijacking
Network Attacks
Malware
Supply Chain Attack
Physical Coercion
Child/Pet Attack
Internal Service Provider Attack
Platform / Hosting Provider Attack
Code Dependency Attack
Official Seizure
Inheritance Failure
🔐Chosen Features
Introduction
Hardware Wallet Signing
Multi-signature
Multi-location
Heterogeneous Hardware and Software
Seedless Hardware Wallets
Emergency Recovery Key
PIN or Biometrics for Mobile Key only
PIN for every device
Sovereign Recovery Instructions
Emergency Lockdown Button
Health Check
Identity Verification for Account Recovery
✅Chosen Key Schemes
3-of-5 Key Shield
2-of-3 Basic Multisig
Single-Key Wallet
❌Rejected Key Schemes
Key Sharding (Shamir’s Secret Sharing)
2-of-2
1-of-2
❌Rejected Features
Biometrics General Usage
Seed Phrase Backups
Financial Products and Services Integration
Brain Wallet -- Memory Based Solutions
Web-Based Key Management
Hardened Addresses
🔧Remaining Attack Vectors
Address Spoofing
Malicious Insider Key Theft
Extreme disaster scenarios
Extortion
👨‍🚀Future Improvements
Taproot/MAST
Schnorr Signatures
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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.
🔐Chosen Features - Previous
Heterogeneous Hardware and Software
Next - 🔐Chosen Features
Emergency Recovery Key
Last modified 4mo ago
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