Picture your kids, ten years from now, sitting at a kitchen table with a hardware wallet in one hand and no idea what to do with it. The device asks for a PIN. Somewhere there might be 24 words written on paper. Maybe a passphrase on top. Nobody knows where any of it is.
There is no help desk to call. Bitcoin's design means the network does not know who you are, so it cannot know who your heirs are either. Whoever holds the keys controls the coins. Whoever does not, cannot get them, no matter what a court order says.
That cuts both ways. Hide the keys too well and your family loses everything. Share them too freely and someone can take it all while you are still alive. Good inheritance planning lives in the narrow space between those two failures. This article explains the concepts; it is not legal advice, and an estate attorney in your state is the right person to put any plan into legal form.
The Two Ways a Stack Dies With You
Almost every inheritance failure falls into one of two buckets:
- Lost access. The coins still exist on the blockchain, but nobody alive can sign for them. No recovery is possible.
- Early access. The backup is stored somewhere a family member, a burglar or a stranger can find and use before it is time.
Custodial holdings work differently. Bitcoin on an exchange or shares of a bitcoin ETF in a brokerage account sit with a company that has an estate process, account records and often beneficiary designations. There the risk is mostly paperwork: heirs who do not know the account exists. Self-custodied coins are where the real planning happens, which is why understanding hot wallets vs. cold wallets comes first.
Layer One: Know What You Own
An inventory sounds boring, and it is the layer most often missing. It lists every place bitcoin lives, without containing any secrets:
| Holding type | What heirs need to know | What heirs need to access it |
|---|---|---|
| Exchange account | Platform name, account email | Death certificate, executor documents, the platform's estate process |
| Bitcoin ETF shares | Brokerage name | Standard brokerage transfer or beneficiary designation |
| Single-signature hardware wallet | Device model and where the backup is stored | Seed words, plus the passphrase if one was set |
| Multisig wallet | Which devices, which software, the quorum (e.g. 2-of-3) | Enough keys to meet the quorum, plus the wallet descriptor or setup file |
The inventory can live with your will or with your executor, because it reveals where things are but not how to unlock them.
Seeds, Passphrases and Why One Backup Is Not Enough
Most wallets back up their keys as a mnemonic defined in BIP 39: 12, 15, 18, 21 or 24 ordinary words. Those words recreate every key in the wallet, on any compatible device. The private and public keys article explains why.
BIP 39 also allows an optional passphrase. Each different passphrase produces a different valid wallet from the same words. That is a strong protection against someone who finds your seed, and a quiet trap for heirs: the seed alone opens an empty wallet, and nothing warns them that a passphrase exists. If you use one, your plan has to say so, and the passphrase has to be recoverable separately.
One more general caution: in many places, a will that goes through probate can become part of a court record that others may be able to see. How that works varies by state, which is one reason seed words are usually kept out of a will.
Analogy: Think of it like a safe deposit box that needs two different keys held by two different people. Neither can open it alone, and losing one key does not lose the box, as long as a spare of that key exists somewhere else.
Multisig: Removing the Single Point of Failure
That analogy is the idea behind multisignature (multisig) wallets. Instead of one seed controlling everything, a 2-of-3 setup creates three independent keys and requires any two to spend. BIP 383 defines the standard notation, written as multi(2,key1,key2,key3).
For inheritance, the appeal is resilience on both sides of the problem:
- One key lost? The other two still spend. Lost access becomes much less likely.
- One key found by the wrong person? It cannot move coins alone. Early access becomes much less likely.
A common pattern is one key with the holder, one with a trusted family member or in a separate secure location, and one with a professional or collaborative custody service. The exact arrangement is a personal and legal decision.
Multisig adds its own requirement: heirs need more than the seeds. They also need the wallet's descriptor or setup file, which records every participant's public key and the quorum. Without it, rebuilding the wallet from seeds alone can be difficult. Backing it up next to each key is standard practice, and it does not by itself allow spending.
The Letter Your Heirs Will Actually Read
A letter of instruction is a plain-language document, separate from the will, written for someone who may know nothing about Bitcoin. It typically covers:
- What the holdings are (pointing to the inventory).
- Where each piece of the backup is stored, without writing the secrets in the letter itself.
- Which software to use and the basic steps to restore a wallet.
- Who to call for technical help, and a warning that anyone who contacts them offering to "recover" coins is likely running a scam.
- A reminder to move slowly. A mistyped address cannot be reversed.
Rehearsal is the step most plans skip. Restoring a backup on a spare device, with a family member following the written steps, reveals gaps while you are still around to fix them. Hardware wallet options are compared in the hardware wallets section.
The Tax Side Heirs Should Know
Two federal rules shape what heirs inherit, per IRS sources current as of October 2026:
- Basis. IRS Publication 551 says the basis of inherited property is generally its fair market value on the date of death. Gifts made during life work differently: the recipient generally takes over the giver's basis.
- Exclusions. For 2026, the IRS lists a basic exclusion amount of $15,000,000 for estates and an annual gift exclusion of $19,000 per recipient.
How these apply to a specific family depends on state law, the size of the estate and how assets are titled. That is attorney and tax-professional territory, and the general rules are covered in Tax Basics for US Bitcoin Stackers.
What This Means for You
- Write the inventory first. Heirs cannot claim what they do not know exists, and an inventory reveals no secrets.
- Plan for both failures. Every backup decision trades the risk of lost access against the risk of early access.
- Flag the passphrase. If one exists, the plan has to say so and make it recoverable.
- Back up the multisig setup file. Seeds alone may not rebuild a multisig wallet.
- Rehearse the recovery. A plan nobody has tested is a guess.
Your keys outlive you only if someone else knows how to use them.