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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Malicious Insider Key Theft
In a typical customer setup, Casa Inc. provides all the hardware wallets (we are an authorized reseller of both Trezor and Ledger). Casa App is downloaded directly from either the Apple iOS App Store or Google Play Store. If an insider attacker got a customer to install a malicious version of the app and provided the customer with malicious hardware devices, it would be possible for an insider to steal the user’s keys.
Mitigation:
  • Casa is an authorized reseller of both Trezor and Ledger, so the devices we provide come directly from the manufacturer.
  • Casa supports the use of hardware wallets obtained directly from manufacturer or from other authorized hardware wallet retailers.
🔧Remaining Attack Vectors - Previous
Address Spoofing
Next - 🔧Remaining Attack Vectors
Extreme disaster scenarios
Last modified 2yr ago
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