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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Seed Phrase Backups
Casa does not recommend that users manually back up all of the seed phrases for their key set. Recall that 2 of your seed phrases are automatically backed up (the mobile key and Casa key.) We do encourage backing up 1 seed phrase to protect against extreme scenarios that might wipe out all of your hardware devices simultaneously.
  • While seed phrase backups reduce the threat of accidental loss, they increase the threat of theft since the seed phrases must also be secured.
  • Seed phrase backups double (or triple) the number of sensitive items that need to be stored. In a 3-of-5 system, this would mean 10 or 15 items to protect instead of 5.
  • For a better understanding of the complexity involved in managing seed phrase backups we recommend reading this blog post.​
❌Rejected Features - Previous
Biometrics General Usage
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Financial Products and Services Integration
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