Bitcoin Inheritance: How to Pass On Sats Without Losing Them

When QuadrigaCX founder Gerald Cotten died suddenly in December 2018, he was reportedly the only person on earth holding the keys to wallets owing customers roughly C$190 million. Investigators later concluded most of that money was gone before he died — the exchange turned out to be a fraud — but the panic it triggered was instructive, because every bitcoiner understood the premise instantly: when a keyholder dies, the coins can die too. Chainalysis estimated back in 2017 that as many as 3.79 million bitcoin were already lost forever — as much as a fifth of the supply at the time. Forgotten hard drives and discarded laptops account for plenty of that. But some meaningful slice belongs to people who did self-custody exactly right, told no one, and ran out of time.

Every other failure mode in bitcoin is probabilistic. This one is guaranteed to trigger eventually. Here is how to make sure your sats outlive you.

Self-custody cuts both ways

The entire point of holding your own keys is that nobody else can move your coins. No bank officer, no court order served on a custodian, no hacker who sweet-talks a support desk. The uncomfortable corollary: nobody can move them for your family either. There is no forgot-password flow on a seed phrase, and the Bitcoin network does not care that the rightful heir is standing right there with a death certificate.

Coins left on an exchange are actually the easy case. An executor with probate paperwork can eventually claim a Coinbase or Kraken account the same way they would claim a brokerage account. But if you have read this blog for long, you know the tradeoff: custodial bitcoin is an IOU with counterparty risk attached. The goal is not to retreat to custodians for the sake of your heirs. It is to keep the sovereignty and add a succession plan.

The mistakes people actually make

The most common inheritance plan in bitcoin is no plan at all. The second most common is one of these:

  • Putting the seed phrase in a will. Wills go through probate, and probate filings are public record in most U.S. states. A will that recites twelve or twenty-four words is a treasure map with a court docket number attached.
  • Telling one person everything. A spouse or sibling with full, unilateral spending power is a single point of failure while you are still alive — against theft, coercion, or a divorce that goes sideways.
  • Relying on a safe deposit box alone. Banks routinely restrict box access when the holder dies until the estate produces court paperwork. And a bank guarding your only backup quietly reintroduces the third party you were trying to remove.
  • Leaving instructions nobody can execute. An heir who has never sent a transaction, handed a note that references a wallet app that stopped existing years earlier, is not meaningfully better off than an heir with nothing.

Three designs that actually work

1. Split knowledge: seed plus passphrase

A BIP39 passphrase — sometimes called the 25th word — turns one seed phrase into two required pieces. Give the metal seed backup to your heir and the passphrase to your executor or attorney, in separate sealed envelopes. Neither can spend alone. Nobody has to be trusted completely, and nothing sensitive sits in a single drawer. The catch: the passphrase must be recorded exactly, and both parties need to know the other piece exists.

2. Multisig with a professional keyholder

A 2-of-3 multisig wallet spreads spending power across three keys. You control two while alive; the third sits with a collaborative custody service, and companies like Casa and Unchained have built inheritance offerings around exactly this design. When you die, your heir combines an inherited key with the service’s key. No single lost key is fatal, no single party can move funds without you, and the recovery process comes with professional hand-holding — useful when the person inheriting is grieving and non-technical at the same time.

3. Simple, boring, findable

For a modest stack, cleverness is its own risk. A stamped metal seed backup in a home safe, plus a plain-English letter your family knows how to find, beats an elaborate scheme your heirs cannot operate. The fanciest vault in the world fails if the people who inherit it cannot open it.

The letter of instruction does the heavy lifting

Whatever design you pick, the letter matters more than the hardware. Stored with your estate documents — never containing the seed itself — it should cover: what you hold, in plain language; where every backup physically lives; what devices are involved; the name of one bitcoin-literate person your family can call; and a step-by-step recovery walkthrough. Include one warning in bold: never type the seed phrase into a website, a phone, or anything connected to the internet until that trusted person is in the room.

Then test it. Load a spare wallet with a few thousand sats and have your heir recover it start to finish, using only the letter. A fire drill that costs a few dollars today can save a fortune later. Review the letter once a year — software changes, stacks grow, people move. Pick a date you will not forget; some bitcoiners use January 3, the anniversary of the genesis block.

A one-weekend inheritance plan

  1. Inventory everything: wallets, keys, backups, and where each physically lives.
  2. Pick the design that matches your stack size and your family — split knowledge, multisig, or simple-and-findable.
  3. Write the letter of instruction and store copies with your executor and your estate documents.
  4. Run the recovery drill with your heir on a small test wallet.
  5. Put a yearly review on the calendar.

Bitcoin lets you carry wealth across borders, governments, and banking crises. With a weekend of work, it can carry wealth across generations too — which was always the harder trick. If you are thinking in decades instead of quarters, you are already in the culture: BitCloset makes heavyweight apparel for people who plan to hold longer than they live.

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