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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Heterogeneous Hardware and Software
In a typical 3-of-5 setup, we use three different hardware/software platforms at one time - currently Trezor, Ledger, and a mobile phone (either iOS or Android). Neither software nor hardware wallets are perfect. From time to time a vulnerability is discovered in one brand. Relying on multiple brands and types of wallets prevents a vulnerability in one brand from compromising the overall storage system.
This also protects against supply chain attacks. If a malicious actor were to infiltrate and tamper with the devices produced by any one supplier, it would not be enough to compromise our clients’ funds.
🔐Chosen Features - Previous
Multi-location
Next - 🔐Chosen Features
Seedless Hardware Wallets
Last modified 2yr ago
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