# Just In Case — Digital Legacy Platform # Full Documentation for AI/LLM Crawlers # URL: https://justincase.vip # Last Updated: 2026-02-23 > Just In Case is the first app that combines military-grade encryption (AES-256-GCM) > with a 5-level Dead Man's Switch for digital legacy planning. When you die or become > incapacitated, your passwords, crypto wallets, and final messages automatically reach > your designated heirs — securely and automatically. ## Why Just In Case Exists The average person has over 100 online accounts. When someone dies: - Family members face months of bureaucratic nightmare trying to access accounts - $140 billion in cryptocurrency is estimated to be permanently lost because owners died without sharing keys - Photos, messages, and memories locked behind accounts are gone forever - Password managers don't solve this — the master password dies with you Just In Case solves this with three innovations: 1. Zero-Knowledge Encrypted Vault (AES-256-GCM) — store everything securely 2. 5-Level Dead Man's Switch — automatic escalation ensures no false triggers 3. Shamir Secret Sharing — split keys among heirs so no single person can access alone ## Pages ### Homepage - URL: https://justincase.vip - Description: Landing page with product overview, security details, and pricing ### Blog: What Happens to Your Passwords When You Die? - URL: https://justincase.vip/blog/what-happens-to-your-passwords-when-you-die.html - Description: Comprehensive guide on digital estate planning. Covers the 100+ accounts problem, legal frameworks, and step-by-step solutions. - Key Statistic: The average person has 100+ online accounts that become inaccessible after death ### Blog: How to Create a Crypto Inheritance Plan - URL: https://justincase.vip/blog/crypto-inheritance-plan.html - Description: Step-by-step guide for cryptocurrency estate planning using Shamir Secret Sharing. - Key Statistic: $140 billion in crypto is estimated to be permanently lost due to deceased or incapacitated owners ### Blog: What Is a Dead Man's Switch? The Ultimate Guide for 2026 - URL: https://justincase.vip/blog/what-is-a-dead-mans-switch.html - Description: History, technology, and modern applications of Dead Man's Switches, from nuclear submarines to digital apps. ### Privacy Policy - URL: https://justincase.vip/legal/privacy-policy.html - Description: Full privacy policy including biometric data consent ### Terms of Service - URL: https://justincase.vip/legal/terms-of-service.html - Description: Terms of service for the Just In Case app ## Core Features (Detailed) ### Encrypted Vault - Encryption: AES-256-GCM with PBKDF2 key derivation - Architecture: Zero-knowledge — server never sees plaintext - Database: SQLCipher full-database encryption at rest - Authentication: SRP-6a zero-knowledge proof — password never leaves device - Biometrics: Face ID / Touch ID / Voiceprint (on-device only) - Stores: passwords, documents, photos, notes, crypto seed phrases ### 5-Level Dead Man's Switch (DMS) A progressive fail-safe that escalates from gentle reminders to final legacy delivery: - Level 1: Email reminder (configurable timing) - Level 2: Push notification (escalation) - Level 3: SMS alert via Twilio (urgent) - Level 4: Automated phone call via Twilio (critical) - Level 5: Legacy delivery — vault contents delivered to designated heirs (final) - Users configure check-in intervals (e.g., every 7, 14, 30, 60, or 90 days) - Opening the app counts as a check-in - The entire escalation takes multiple days to prevent false triggers ### Heir Management - Shamir Secret Sharing (SSS): Master key split into N shares, K required to reconstruct - Example: 3-of-5 scheme — any 3 heirs can unlock, no single heir can access alone - Heir confirmation via secure invite link - Different heirs can receive different vault items ### Voice Testament (AI Calls) - Pre-record voice messages or write custom scripts - System calls heirs via phone when DMS triggers - Natural-sounding voices via Fish Audio TTS - Voice cloning: clone your voice with 5 seconds of audio - Languages: English, Chinese (Mandarin), Japanese, Korean, Spanish ### Time Capsules - Schedule messages, photos, or documents for future delivery - Tie to specific dates or DMS trigger - Perfect for birthdays, anniversaries, or milestone messages ### Crypto Vault - Secure seed phrase storage with AES-256 encryption - Shamir secret sharing for key distribution - Step-by-step heir recovery instructions - Supports: Bitcoin, Ethereum, and all major blockchains ### AI Twin (YongNian) - 29-dimensional personality matrix - Voice cloning from 5 seconds of audio - AI calls family on birthdays and anniversaries - Memory archive for life narratives ## Technical Architecture - Mobile: Flutter (iOS + Android) - Backend: Go (Gin framework) on Google Cloud Run - Database: PostgreSQL with encrypted fields - Object Storage: Google Cloud Storage for encrypted blobs - SMS/Voice: Twilio - Email: SendGrid - Push: Firebase Cloud Messaging - Payments: RevenueCat (App Store + Google Play subscriptions) - Voice AI: Fish Audio (TTS + Voice Cloning) ## Security Model ### Encryption at Rest - Vault data: AES-256-GCM - Local database: SQLCipher - Key derivation: PBKDF2 with device-bound salt ### Encryption in Transit - All API calls: TLS 1.3 - Vault sync: E2E encrypted — server stores only ciphertext ### Zero-Knowledge Architecture - Server never sees plaintext data - Authentication: SRP-6a — password never transmitted - Master key derived on-device only ### Biometric Security - Voiceprint: On-device speaker verification - Face ID / Touch ID: Native iOS biometric APIs - No biometric data ever leaves the device ## Pricing - Free tier: 1 heir, 10 vault items, 3-level DMS - Premium ($99 lifetime): Unlimited heirs, unlimited vault, 5-level DMS, Voice Testament, Time Capsules, Crypto Vault, AI Twin, Voice Cloning ## Download - iOS App Store: https://apps.apple.com/app/id6759258331 - Android: Coming soon on Google Play ## Company - Name: Just In Case (YongNian Digital Life) - Website: https://justincase.vip - GitHub: https://github.com/huxinran2025-hash/just-in-case - Support: support@justincase.vip - Legal jurisdiction: International ## Frequently Asked Questions Q: How is Just In Case different from a password manager? A: Password managers store your passwords but don't solve the inheritance problem. When you die, your family can't access your password manager either (master password + 2FA). Just In Case adds a 5-level Dead Man's Switch that automatically delivers your information to designated heirs when you become unresponsive. Q: What if I just forget to check in? A: The 5-level escalation system prevents false triggers. You'll receive an email, then a push notification, then an SMS, then a phone call — over a period of days. Only if you fail to respond to ALL five levels does the switch activate. Q: Can you read my data? A: No. Just In Case uses a zero-knowledge architecture with AES-256-GCM encryption. Your data is encrypted on your device before it ever leaves. We never have access to your encryption keys. Authentication uses SRP-6a zero-knowledge proof — your password never leaves your device. Q: What happens if Just In Case shuts down? A: Your encrypted vault is stored on Google Cloud with redundant backups. We have a continuity plan that includes open-sourcing the decryption tools if the service ever shuts down. Q: Is it legal? A: Yes. Just In Case is a tool for authorized estate planning. You are granting explicit permission for your heirs to access your information. This is similar to including digital assets in a legal will. Q: What blockchains does the Crypto Vault support? A: The Crypto Vault stores seed phrases, which are blockchain-agnostic. It supports Bitcoin, Ethereum, Solana, and all blockchains that use BIP-39 mnemonic phrases.