Passphrase inheritance: how your family finds and uses it

If you added a passphrase to your wallet, you did it for a good reason: someone who finds your seed phrase still can't reach your bitcoin. I'm writing from the other side of that decision, as the wife who would have to find it, type it, and know it worked.

My husband keeps our bitcoin in self-custody, and I'm not technical. He'd "explain it." I'd nod. I couldn't have used any of it. A passphrase widens that gap. It's the one secret designed to be hard to find, and the one where a small typing mistake gives no warning at all. This is one part of a bitcoin inheritance plan, and our full guide to bitcoin inheritance covers the rest.

What you know about passphrases, and what she'll need explained

An extra secret, sometimes called the 25th word

You know this. These are the sentences your wife will need, the first time each term appears.

A seed phrase, also called a recovery phrase or BIP-39 seed phrase, is a list of words that can rebuild a wallet and the private keys inside it. Private keys are what approve spending. The BIP-39 standard (also written BIP39 or BIP 39), which most wallets follow, calls these words a mnemonic code.

The BIP-39 passphrase is an optional extra secret added to those words. People call it the "25th word," but it can be any length and can include capitals, numbers, spaces, and symbols. Some wallet programs call the wallet it opens a "hidden wallet." The seed phrase plus the passphrase opens one wallet. Anything else opens a different one.

Why a typo opens a different, empty wallet

You know there's no such thing as a wrong passphrase. Your wife probably doesn't. When I learned how passphrases work, this scared me more than anything else. Type "Garden" instead of "garden," or add a space at the end, and the wallet opens normally. It's just a different wallet, and it's empty.

No error message. No warning. Just a balance of zero, on the worst week of her life. She may believe the savings are gone, or that she broke something. So say it right next to the step where the passphrase is typed: if the balance is empty, stop. Nothing is lost. Check and retype.

Passphrase inheritance: how your family finds it without seeing it in the instructions

Why keeping it separate makes inheritance harder

You kept the passphrase apart from the seed phrase backup on purpose, and that protection is real.

The same separation is what makes inheritance hard. Your family now has two secrets to find instead of one, and the second may be the one nobody knows exists. Most seed phrase storage advice is about keeping things hidden. Passphrase inheritance is about making sure the right person can still find what you hid. The first half of that is in seed phrase inheritance.

Write where to find it, never what it is

Writing it down probably feels like undoing your security. It doesn't have to. Our instructions contain no secrets. For your passphrase, that means three things, said plainly:

• That a passphrase exists.
• Where it is, apart from the seed phrase backup, in words she can follow without asking anyone.
• Exactly where to type it, and how to check that it worked.

Never what it is. That's the job of a letter of instruction, the practical side of bitcoin estate planning: the steps in one place, the secrets somewhere else. There's more in how to write a bitcoin letter of instruction. If you have more than one wallet, add a wallet map, a simple list of which wallet goes with which steps.

In ours, the secret words are printed in red everywhere they appear. Whenever I saw red, I knew to slow down.

Define every word the first time it appears

This is the one you can't check yourself. The first time I followed my husband's instructions alone, with him sitting behind me and not allowed to help, I got stuck early. Mostly on words he didn't notice were jargon.

"Passphrase" sounds like "password," and I'd have treated it like one: something you can reset. "Restore," "receive address," and "hardware wallet" each needed a plain sentence. For her, a hardware wallet (Coldcard, Ledger, and Trezor make them) is "a small device that keeps the keys offline and shows each action on its own screen for you to approve." A software wallet is "the program on the computer or phone."

Every setup has its own pieces

The custody type matters too. Not every self-custody setup uses a passphrase. A multisig wallet needs several keys to approve spending, for example 2-of-3 multisig, plus a wallet descriptor that shows how the keys fit together. Collaborative custody splits keys between you and a company. A Shamir backup (SLIP-39, based on Shamir's Secret Sharing) splits the recovery words into shares. Time-locked recovery lets a backup key work only after a set time.

You've probably weighed these already, and I won't tell you which to use. From her side, each one adds pieces to find and steps to follow, and multisig inheritance covers that side. Whatever you chose, the test below works the same way.

How she'll know she typed it correctly

Type it only where the instructions say

Name the exact screen where the passphrase is typed. Then say where it is never typed: not into a website, not into a message, and not for anyone who contacts her offering help. Write it as a rule: anyone who asks for the passphrase is someone to stop talking to.

Give her a recorded check to identify the right wallet

Since a typo gives no error, she needs another way to know she's in the right wallet. Ours has a check after each stage: I compare the last few characters of an address on the screen against what's written on a sheet. If they don't match, I stop and retype.

Identifying a wallet is not confirming a payment

You know the difference. Spell it out for her anyway. That check answers one question: is this the right wallet? It never confirms where money is going. When the instructions get to sending, she compares the full receiving address on the hardware wallet's own screen, character by character, before approving anything.

Can your family follow the steps without your help?

What happened when I tried while my husband watched silently

You've probably explained all of this to her already. My husband had too. Hearing it and doing it alone were very different things.

Every time I got stuck, he rewrote the step in my words, and I started again from the top. It took many rounds.

Practice on the real setup, with a small amount

Use the real instructions and the real items. Agree on limits first: anything that moves bitcoin moves only a small test amount, and nobody reads a secret out loud. Sit behind her and say nothing while she goes from start to finish, including typing the passphrase and running the check. If you give a hint, that step gets rewritten and tried again. Most bitcoin inheritance planning skips this step, and it's the one any crypto inheritance plan depends on.

Do it again every year

We redo ours once a year. Redo yours after any change to the setup, to where things are, or to who would do it.

Make finding, typing, and checking it repeatable

Your passphrase is only a good protection, and a good part of bitcoin estate planning, if the person who needs it can find it, type it exactly, and know it worked. The rehearsal proves your instructions work. This week, hand her the steps and watch.

A will decides who inherits your crypto assets, and that side of digital estate planning is a question for a professional where you live. For the bigger picture of what happens to bitcoin when you die, see what happens to your bitcoin when you die.

Frequently asked questions

Is a bitcoin passphrase the same as a seed phrase or a PIN?

No. The seed phrase, or recovery phrase, is the list of recovery words. The passphrase is an extra secret added to those words. The PIN only unlocks the hardware wallet. Label each one clearly.

Why does the wallet look empty after entering a passphrase?

Most often, a slightly different passphrase. Nothing is lost. Put this in your instructions: stop, use the check, and retype, watching capitals and spaces.

What if nobody can remember the passphrase?

That's why your instructions say where it is, so nobody has to remember it. With self-custody bitcoin, if it's truly lost, there's usually no way to get it back, and no company can reset it. Tell your family now: anyone who contacts them offering to recover it should not be trusted.

Should the passphrase appear in the letter of instruction?

No. The letter says that it exists, where to find it, where to type it, and how to check it worked. Never what it is.