SHAMIR'S SECRET SHARING // 2-OF-3 THRESHOLD

Crypto Inheritance
Without Trust

Split your seed phrase into three shards. Any two can recover it. Your beneficiary gets the third shard only when you stop responding.

Create Vault View Protocol

ENCRYPTION

Client-Side Only

THRESHOLD

2-of-3 Shards

TRIGGER

90-Day Inactivity

TRUST

Zero Knowledge

// THE PROBLEM

$140B in Crypto Will Die With Its Owners

Self-custody solves the trust problem. But it creates a new one: when you die, your keys die with you.

4M+

Bitcoin lost forever

23%

Of holders have no inheritance plan

Value of crypto without the key

OPTION 1: DO NOTHING

Your family gets nothing. Your crypto becomes permanently inaccessible. Wealth evaporates.

OPTION 2: SHARE YOUR SEED

Anyone with the seed can take everything. You're trusting them with 100% of your assets, 100% of the time.

OPTION 3: USE A CUSTODIAN

Banks, lawyers, exchanges. They can freeze, lose, or steal your assets. You've re-introduced trusted third parties.

Option 4: Shardium — Trustless inheritance through cryptography

// THE SOLUTION

The Shardium Solution

Split your seed phrase into 3 shards. Any 2 can recover it. No single party can steal it.

Shard A

You keep this. Store in a safe or password manager.

Shard B

Give to your beneficiary. Print it as PDF.

Shard C

Held by Shardium. Released when switch triggers.

Any 2 shards = Full recovery

A + B = ✓

A + C = ✓

B + C = ✓

A alone = ✗

B alone = ✗

C alone = ✗

// PROTOCOL

How It Works

Mathematically secure. No single point of failure. No custodian risk.

Split Locally

Your seed phrase is split into 3 shards using Shamir's Secret Sharing. This happens entirely in your browser. We never see the original.

Distribute Shards

Shard A: You keep. Shard B: Give to beneficiary. Shard C: We store encrypted. Any 2 shards reconstruct the original.

Dead Man's Switch

We ping you every 30 days. After 90 days of silence, Shard C is automatically sent to your beneficiary.

// SECURITY MODEL

Zero Trust Architecture

Even if we're compromised, attackers get nothing useful.

ATTACK: Database Breach

We only store Shard C. Without Shard A or B, it's cryptographically useless. Information-theoretic security means it can't be brute-forced.

ATTACK: Rogue Employee

No one at Shardium can access your funds. The math prevents it. 2-of-3 threshold means we'd need to collude with your beneficiary.

ATTACK: Man-in-the-Middle

Splitting happens client-side, offline-capable. Your seed phrase never travels over the network. No interception possible.

ATTACK: Beneficiary Fraud

Shard B alone is useless. They need Shard C which only releases after 90 days of your inactivity. You control the heartbeat.

BONUS: Lost Seed Phrase? No Problem.

If you lose your original seed phrase, just combine Shard A + Shard B to recover it instantly. You're your own backup — no need to panic, no third party required.

// OPEN SOURCE

Audit the Code

Everything is open source. Verify the cryptography yourself.

secrets.js-grempe

FastAPI

PostgreSQL

Vercel Edge

View on GitHub

// PRICING

Simple, Transparent Pricing

Self-host for free forever, or let us handle the infrastructure.

Monthly Yearly 2 MONTHS FREE

SELF-HOSTED

$0 forever

Clone the repo, run it yourself.

Full source code access
MIT Licensed
Discord community
Community support

Clone on GitHub

Pay once, use forever

No subscriptions. No renewals. Lifetime access to Pro features.

$299 once

17 of 50 remaining

Get Lifetime

All plans include: Client-side encryption, Shamir's Secret Sharing, 2-of-3 threshold recovery

Don't Let Your Crypto Die With You

Set up your vault in under 5 minutes. Your seed phrase never leaves your device.

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Crypto Inheritance Without Trust