Printed sheet
The fragment's words printed in full, beside a Seedcase QR. The format a notary can file, a bank can hold, and an heir can read without an app.
Protect your seed phrase today. Pass it on tomorrow.
Seedcase splits your seed phrase into fragments you keep on different media, wherever you decide. On its own, a fragment reveals nothing.
One copy is a single point of failure.
An estimated 3 to 4 million bitcoin will never move again. Almost none of it was hacked. A single copy failed in three ordinary ways.
The copy that was destroyed.
A fire, a flood, a move, a drawer emptied by someone who did not know what the paper was. One accident, and everything is gone at once.
The copy that was stolen.
A burglary, a roommate, a photo that synced to an account you forgot you had. Whoever holds those twelve words holds everything. There is no way to reverse it.
The copy nobody found.
You planned for everything but your own absence. Your family knows your crypto exists, but not where to look, or what to do with a simple list of words. A secret kept too well, and no one inherits.
How Seedcase works.
Three moves: Split the phrase. Place the fragments. Get the seed phrase back when you need it.
01
Split
Split your seed phrase into as many fragments as you want, and choose how many are needed to put it back together. Two of three, four of seven, seven of ten: you define the rule. No single fragment works alone.
02
Store
Each fragment goes to a different place: a vault, a family home, a notary's office... You choose where each one lives. No single location holds the full secret.
03
Reconstruct
When you need it, bring together the number of fragments you chose and reconstruct the original seed phrase.
A fragment is an object.
Mobile vault
A fragment held in the Seedcase encrypted vault app. Sealed at rest, always on you.
Metal plate
Fire and water resistant. For the fragment that has to survive the house, not just the decade.
Desktop vault
A fragment held in an encrypted vault on a computer. Sealed at rest.
EAL5+ NFC card
plannedAn additional layer of security, on a certified chip. Credit-card format, for a wallet.
What people use it for.
Transmission.
Passing on crypto usually means handing someone the seed, or hoping they find it. Seedcase gives you a third way.
- Fragments go to a family member, a notary, a vault... where none of them can act alone.
- Together, when the moment comes, they recover everything.
- No account, no technical knowledge.
A backup with no single point of failure.
Your seed phrase stops living in one place. Lose a fragment and you still recover everything. Someone finds a fragment and they still have nothing.
Shared control.
Require several people to agree before anything can be put back together. A couple, business partners, a family. Nobody acts alone, and nobody is locked out.
Business continuity.
A company holding crypto on its balance sheet has the same problem, with more people in the room. Several people can recover it together. None of them can do it alone. If one of them leaves, the company still can.
For notaries and wealth advisors
Your clients hold digital assets. Most have no plan for transmitting them, and handing you the seed would make you a custodian.
You can sit in that plan without taking custody. One fragment, below the threshold they set, plus the written procedure. You document it like any other holding. Alone, it opens nothing.
No technical training required. No liability transfer. No custody.
FAQ
Is my seed phrase compatible with Seedcase?
Yes. Any hardware or software wallet that generates a 12 or 24 word seed phrase in the BIP-39 format is compatible. That is the format almost every wallet uses.
What happens to my fragments if Seedcase disappears?
Nothing. We store no fragments, hold no keys and run no server that your recovery depends on. Your fragments are SLIP-39 shares in a public format, and our reader is open source.
Do my heirs need Seedcase to recover the wallet?
Not strictly. Your fragments are standard SLIP-39 shares, so any compliant tool can combine them. What that returns is the entropy behind your seed phrase, and converting entropy back into the original words is a standard, documented operation that any BIP-39 tool performs. Seedcase does both steps automatically and in one place.
Is Seedcase custodial?
No. Fragments are generated on your device and stay under your control. We never hold your seed phrase, and we never hold your fragments.
Can someone with one fragment steal my funds?
No. A single share below the threshold reveals no information about your seed phrase. That is a mathematical property of Shamir Secret Sharing, not a policy we enforce.
What happens if I lose a fragment?
Nothing, as long as you still hold the threshold you defined. A 2 of 3 scheme survives the loss of any single fragment. Then reconstruct from what remains, create a new set, and destroy the old fragments you still hold. A lost fragment may still turn up later, in someone else's hands; a new set makes it useless.
What does it cost?
Beta access is free. Pricing beyond the beta is not settled yet, and we would rather announce it once than change it twice.
Has it been audited?
An independent security audit is planned and will be published in full. Until then, the cryptographic core is open source and available for review.