Show HN: Eternal Vault, E2EE Estate Platform Using Shamir's Secret Sharing

Built Eternal Vault to solve a widespread problem of digital assets being lost or inaccessible with proper cryptography.

Technical approach:

- Client-side AES-256 encryption (plaintext master key never leaves device)

- Shamir's Secret Sharing for access control (3-of-3 threshold)

- Zero-knowledge architecture

- Trust levels distribute key shares to family members

Security model:

- Everything encrypted before network transmission

- Can't decrypt user data even if we wanted to

The problem: Over $200 billion in inaccessible assets worldwide¹, including $140+ billion in lost Bitcoin alone². Government data shows billions in dormant accounts unreachable by families across multiple countries³. 76% of people have no digital estate plan.

What it does:

- Secure storage for wills, passwords, photos, documents

- Smart family access controls with trust levels

- Gamified legacy building with guided checklists

- Business continuity features

Would love feedback on the cryptographic design and threat modeling from the HN community.

Try it out: https://dash.eternalvault.app/register

Sources:

1. https://eternalvault.app/citations

2. https://www.ibtimes.com/lost-bitcoin-wallet-passwords-make-1...

3. https://www.cnbc.com/2023/02/01/how-to-check-if-youre-owed-a...