Crypto Inheritance: How to Pass On Crypto Without Handing Over a Seed Phrase

A crypto inheritance plan has to do two things that pull against each other. Your heirs must be able to reach your coins after you die, and nobody, heirs included, should be able to take them while you're alive. A single seed phrase can't do both: whoever holds it holds everything, today. The plans that work split access into pieces, so no one person can act alone, but the right group can act together when the time comes.

Why this matters

Lost crypto stays lost. In 2020, Chainalysis counted 3.75 million bitcoin as lost out of 18.27 million mined (Chainalysis). That's about one in five. There's no bank to call and no court order that can make a blockchain hand coins to an heir. If nobody can sign, the coins sit there forever.

The common options

A seed phrase in a will or a drawer

It's the simplest plan, and it has two big issues. Anyone who finds the words can empty the wallet, today, without waiting for anything. And a will isn't private. In New York, for example, once a will is admitted to probate, "it becomes a public document that anyone can see and read". Writing your seed phrase into it publishes your key.

A trusted person holds everything

Same problem in a different place. You've moved the single point of failure from a drawer to a person, who can lose it, be robbed, or be tempted.

Inheritance services built on multisig

Bitcoin-focused companies offer structured plans. Casa gives your heir a key they "only receive access to … after you pass away", after a six-month inactivity check. Unchained's Inheritance Protocol is designed so your executor can "recover your bitcoin without pre-existing technical expertise". These work well, mostly for bitcoin, and involve a company in the process.

Dead-man switches and timelocks

A dead-man switch releases information after a period of inactivity. Its weakness, as security researcher Jameson Lopp put it, is that "you need it to be 100% reliable". A false trigger leaks your secret. A missed trigger locks your heirs out. Timelock wallets such as Liana move that logic on-chain: "after a configurable delay, they can recover funds if you are unavailable".

The idea that makes it work: thresholds

The 1979 idea behind most good inheritance plans is threshold sharing. Adi Shamir showed how to split a secret into n pieces so any k of them rebuild it, while "complete knowledge of k - 1 pieces reveals absolutely no information".

Think of a safe deposit box that needs two of three keys. You hand them to three different people. Any one key opens nothing. Any two open the box. You decide who gets which key, and that choice is your inheritance plan.

Inheritance with a Vultisig vault

A Vultisig Secure Vault is built on thresholds from the start. There's no seed phrase. The key is created as shares on separate devices, and each device exports its own encrypted backup file. A signature needs the threshold of shares, such as 2 of 3 or 3 of 4. The full key never exists anywhere.

That means inheritance is a question of who holds which share. Our docs suggest this layout for a 2-of-3 vault (Backup and recovery):

• Share 1: your own secure storage.
• Share 2: your spouse or a trusted family member.
• Share 3: your lawyer or accountant.

After you're gone, any two of them can restore the vault and move the funds. While you're alive, none of them can act alone.

The honest catch: in this layout, two of those holders could act together without you. The docs say it plainly: make sure the share holders "cannot easily collaborate without your knowledge." Ways to tighten it:

• Keep two shares yourself in a 2-of-3. One on your phone, one sealed with your will or in a safe deposit box. Your heir holds the third. Nobody can sign without you while you're alive, and your heir plus the sealed share is enough afterward.
• Use 3 of 4 if you want more people involved, so it takes three of them to act.
• Pick holders who don't know each other well, such as a family member and a professional.

Write it down, minus the keys

Your heirs need instructions as much as they need shares. A letter of instruction, stored with your will, should cover:

• That the crypto exists and which wallet holds it.
• Who holds each share, and how many are needed.
• Where each backup file is kept, and where its password is.
• How to restore: install the app, import the shares, then sign.

The letter should never contain a full key. With a threshold vault, there isn't one to write down.

Test it

Restore the vault from the backup files on a spare device before you rely on the plan. Do it again whenever you change devices or holders. A plan that was never tested is a guess.

FAQ

How do I pass on crypto when I die?

Split access so no one person can take the funds while you're alive, but a group of heirs or advisers can recover them afterward. Threshold vaults, multisig inheritance services and timelock wallets all do this. Leave a letter of instruction with your will.

Should I put my seed phrase in my will?

No. Wills can become public during probate, and anyone who reads the phrase can take the funds immediately.

What happens to crypto if the owner dies without a plan?

If nobody can produce the keys, the coins are effectively lost. Chainalysis counted 3.75 million bitcoin as lost in 2020.

Can heirs recover a Vultisig vault?

Yes. Restoring a Secure Vault needs the threshold of share backup files, such as 2 of 3, plus any passwords set on them. There's no seed phrase involved.

What is the best crypto inheritance solution?

One where no single person or document can move the funds alone, the right people can recover them, and you've tested the recovery. A threshold vault with shares split between you, an heir and an adviser covers all three.

Plan for the day you can't sign

The coins outlive the person who holds the keys. Split the keys among the right people, write down how to use them, and test the plan once.