Lesson 7 — Inheritance and incapacity planning
Self-custody that doesn't survive your death isn't self-custody — it's a delayed loss. Today: how to make keys reachable by the right people without disclosing them publicly.
The hardest problem in self-custody isn't keeping keys safe from attackers. It's keeping them reachable by the right people when you can't reach them yourself. Most self-custody inheritance failures aren't from bad cryptography — they're from will documents that became public on probate, or from spouses who knew the seed existed but not where to find it. This lesson is about the operational and legal architecture that prevents both.
The dead-man's-switch problem: by definition, you cannot be present when your inheritance plan is executed. You need a chain of events that, in your absence, gets the right people the right information without exposing it earlier. The chain has three steps: a trigger (your death or incapacity is confirmed), a custodian (someone or something that releases information when triggered), and a recipient (your heir, who must then act on the information). Every well-functioning plan addresses all three; most failed plans skip at least one.
Probate is public. In most jurisdictions, a will becomes a court-filed document once the testator dies and the will is admitted to probate. Anything in the will — including a seed phrase — becomes part of the public record. Several documented self-custody losses trace back to seeds being read by court clerks before heirs could secure the wallet. **Never put the seed itself in a will.** What you put in the will is a pointer: a reference to a separate, sealed letter of last instructions, and the legal authority for your executor to act on it.
The letter-of-last-instructions pattern works like this: a sealed document, written by you, that explains *where* the seed lives, *how* to access it, and *what to do with it* — but doesn't contain the seed itself. It might say 'the seed is in the metal backup in the home safe, code 1234; the passphrase clue is in deposit box A at Bank X.' The letter exists outside the will. The will refers to its existence and authorises your executor to act on it. If the will is challenged in probate, the seed is not exposed; the letter remains sealed in the executor's possession.
Communication with non-crypto-fluent heirs is the under-appreciated step. A spouse or executor who has never used a hardware wallet won't know how to type a 24-word seed into a recovery flow, won't know what derivation path to choose, won't know to check for a passphrase. The realistic plan includes operational instructions: 'use Wallet Brand X, version Y, choose 'restore from seed phrase', type these 24 words in this order, on the next screen enter this passphrase, you'll see balances on these addresses, send them to address Z which is the estate account.' Step-by-step, with screenshots if helpful, written for someone who has never done this before. Update it when the wallet software changes.
Time-locked recovery is an advanced option for users who want a fallback even if no one trusted is available. A 2-of-3 multisig where the third key is a time-locked address — spendable only after a certain block height — gives heirs a path even if the other two keys are lost. Several services and open-source designs implement variants. The cost is operational complexity and the requirement to occasionally refresh the time-lock (so it doesn't expire before you intended).
After a death is publicised, the recovery-scam wave starts. Heirs are reliably contacted by 'asset-recovery specialists' offering to find lost crypto for an upfront fee. This is the same scam pattern we cover on the Post-Scam page — it preys on grief, urgency, and unfamiliarity. Build the warning into the letter of last instructions: 'anyone offering to recover crypto for an upfront payment is committing fraud. Real recovery, where it exists, is exchange compliance + law enforcement work that takes months.'
Example
A workable plan for an individual with substantial self-custodied holdings looks like this: a will, drafted by an attorney, that names an executor and references a sealed letter of last instructions held by the same attorney. The letter, sealed in two physical copies (one with the attorney, one in a bank deposit box accessible to the executor by death certificate), describes which wallets exist, which physical locations hold which seeds, which devices to use, the derivation paths, the passphrase clue, and the operational walk-through for the executor. The seed itself is never in the letter — only the locations. The executor, on triggering, retrieves the seed from its physical location, the passphrase clue from a different location, and executes the recovery on a fresh device per the walkthrough. If anything goes wrong, the attorney has a separate one-page 'first-call' instruction explaining how to verify the executor and how to release the letter to them.
Common mistakes
- Putting the seed phrase directly in the will. The will becomes public on probate; the seed is exposed.
- Telling a spouse 'the seed is in the safe' but never walking them through the actual recovery procedure. They know where it is but can't use it.
- Forgetting the passphrase in the inheritance plan. If the letter only points to the seed, your heir inherits the no-passphrase decoy wallet.
- Naming an executor who is technically incapable of executing the plan. Pick someone who will get it right with a written walkthrough — or pre-arrange with a service that handles the technical side.
- Not refreshing the plan. Wallet software changes; storage locations change; passphrase clues become incomprehensible. A plan from five years ago that has never been re-checked is often non-functional.
- Not warning your heirs about recovery scams. After the death is publicised, your heirs become targets.
Safety warning
Nothing in this lesson is legal or tax advice. Inheritance law varies dramatically by jurisdiction. Consult a qualified estate-planning attorney in your country before finalising any plan. This lesson covers the cryptographic and operational mechanics — the legal scaffolding around them is your attorney's job.
Check your understanding
You want to make sure your spouse can recover your crypto if you die unexpectedly. Which approach best protects against probate exposure?
Key terms covered
Sources & further reading
- SecondaryCasa — Crypto inheritance planning
Public materials on inheritance architectures for self-custodied crypto.
- SecondaryPamela Morgan — Cryptoasset Inheritance Planning (book reference)
Author and attorney specialising in crypto inheritance — referenced for the framework, not as a financial product.
- PrimaryBIP-65 — CHECKLOCKTIMEVERIFY (time-locked transactions)
Underlying mechanism for time-locked recovery designs.
We prioritise primary sources. Where a topic moves quickly (regulation, security incidents), we re-check sources on the cadence shown by the page's "Next review" date.