Most cryptocurrency that disappears at death is not stolen. It is stranded. The owner dies holding assets that still exist on a public ledger, and the family cannot reach them, because the key is gone, the holding was a secret, or the exchange will not open the account. The asset survives; the access does not.
A person who wants to inherit cryptocurrency from a parent or spouse faces a problem that traditional assets rarely pose. A bank account has a custodian who answers a death certificate and letters of authority. A brokerage has a transfer agent and a paper trail. Self-custodied digital assets often have neither. They sit at an address controlled by a private key, and whoever holds the key holds the asset. When the only person who held it dies without leaving a usable way in, the value does not pass to the heirs. It simply stops moving, sometimes forever.
This article is a taxonomy of how that happens. It is not a survey of inheritance structures — our companion piece on self-custody and digital-asset inheritance in New York already sets out multi-signature arrangements as one way to hold keys against the day they are needed, and this article does not repeat that ground. The purpose here is narrower and more practical: to name the distinct failure modes that defeat a cryptocurrency inheritance, and to set against each the planning step that prevents it. The failures are not exotic. They are ordinary, repeatable, and almost always avoidable with a plan made in advance.
It is general information, not legal, tax, or security advice. How any of this applies depends on what a person actually owns, how it is held, where the heirs and the custodians sit, and the law in force. Two ideas run through everything that follows and are worth stating at the outset. The first is a paradox: the same self-custody that protects digital assets from theft and seizure during life is exactly what destroys them at death when no plan exists. The second is that the fix is rarely technical. It is documentary, fiduciary, and procedural — an inventory, an access plan, the authority to act, and safe habits for moving a key from one generation to the next.
Lost keys, and the inventory the family never sees
The first failure mode is the one everyone names: lost private keys and seed phrases with no recoverable backup. A self-custodied wallet is controlled by a string of secret data — a private key, or the seed phrase from which keys are derived. There is no administrator who can reset it and no institution that holds a copy. If the seed phrase was memorized and the owner dies, it dies with them. If it was written on a card in a drawer and the drawer is cleared, it is gone. The chain still shows the balance, and no one alive can spend it. The loss is permanent in a way few other assets can match.
The second failure mode is quieter and at least as common: no record that the assets exist at all, so the family never looks. An heir cannot recover a holding they do not know about. A person who accumulated digital assets privately — across several wallets, a hardware device, an old exchange account from years ago — may leave an estate whose executor has no reason to suspect any of it is there. The assets are not lost to a forgotten key in that case; they are lost to silence. They sit unclaimed because the only person who knew the map is gone, and nothing in the visible estate points to them.
The prevention for both is the same instrument: a current inventory of digital assets, kept up to date, and kept separate from the will. The inventory records what exists and where — which wallets, which devices, which exchanges, which assets — without exposing the secrets that control them. It is the document that tells an executor to look and tells the family what they are looking for. To inherit cryptocurrency, someone first has to know it is there. The inventory is how they know, and keeping it current is the discipline most owners postpone until it is too late to keep at all.
An heir cannot recover a holding they do not know about. The first thing a plan has to do is tell the family the asset exists.
The custodial exchange that will not open the account
Not all digital assets are self-custodied. Many sit on a custodial exchange that holds the keys on the owner's behalf, and this introduces a different failure mode. The account holder dies, and the heirs cannot satisfy the exchange's process to release the assets. Each platform sets its own requirements for a deceased user's account, and those requirements can be demanding — a death certificate, letters testamentary or of administration, identity verification, and platform-specific forms, sometimes routed through support channels that were not built for estate administration. A family without the right documents, or without the patience the process takes, can find the account closed to them.
Two further risks attach to custodial holdings, and they are outside the heirs' control. The exchange itself can fail, enter insolvency, or freeze withdrawals, in which case the account holder's claim becomes a creditor's claim in someone else's proceeding rather than an asset the estate can simply collect. And the account may be protected by access controls — two-factor authentication tied to the decedent's phone, an email the family cannot reach — that the exchange's own recovery process may or may not resolve. A custodial account is not a vault the heirs can open with a key. It is a relationship with a company, and the company's terms and conditions govern whether the relationship survives the user.
The prevention is preparation aimed at the process rather than the secret. The inventory should record which exchanges hold assets and under what account identity, so the executor knows where to direct a claim. The estate's fiduciary should be ready to present what these platforms require — the death certificate and the letters of authority that prove the right to act — and to do so promptly, because dormant accounts and shifting platform policies do not reward delay. Where a holding is large enough to matter, it is worth understanding a given platform's stated procedure for deceased accounts while the owner is alive, so the family is not learning it for the first time under pressure.
Devices, two-factor, and the lockout that outlives the owner
Even when the key exists and the family knows where it is, a third failure mode can still close the door: device and two-factor lockout. Digital assets are frequently reached through a specific phone, a hardware wallet, or an application secured by a PIN, a biometric, or a password manager that itself requires a credential. Two-factor authentication compounds the problem, routing a final confirmation to a device or an account only the decedent could open. The heirs may hold the seed phrase and still be unable to move the assets, because the practical path to them runs through a locked device and a confirmation step no one living can satisfy.
This failure is distinct from a lost key, and it has to be planned for separately. A seed phrase recorded in an inventory does the heirs little good if recovering the wallet from that phrase requires hardware they cannot open, software they cannot reach, or a second factor that is gone with the owner's phone number. Hardware wallets carry their own PINs and recovery steps. Password managers are single points of failure and single points of rescue at once: the vault that holds everything is itself behind one credential, and whether the family can open it determines whether everything inside is reachable.
The prevention is a secure access plan that documents not just the secrets but the path — which device, which application, which recovery method, and how a second factor can be re-established by someone authorized to do so. The plan should anticipate that phones are wiped, that subscriptions lapse, and that recovery codes have to be stored somewhere the family can find. None of this means writing the keys into an unguarded document, a point the next section takes up directly. It means recording enough of the route, held securely, that an authorized person can walk it without guessing.
The heirs can hold the seed phrase and still be locked out — by a wiped phone, a hardware PIN, or a second factor that died with the owner.
Keys passed unsafely, and the will that becomes public
The fourth failure mode is self-inflicted and avoidable: keys passed insecurely. The most damaging version is writing a private key or seed phrase into the will itself. A will is not a private document forever. When it is admitted to probate it can become a court record, and a secret written into it can be exposed to anyone who reads the file. A key that controls real value has no business in a document designed to be read aloud and filed with a court. Putting it there does not protect the heirs; it publishes the very thing that protects the asset.
The opposite error is sharing keys too freely while the owner is alive. Handing a seed phrase to several relatives, storing it in shared cloud notes, or emailing it for safekeeping exposes the asset before death ever arrives, to anyone who reaches that copy and to every accident in between. The security problem at death is a balance: the key must be recoverable by the right person at the right time, and unreachable by everyone else until then. Too much secrecy strands the asset; too much sharing surrenders it. Both extremes lose it, by opposite routes.
The prevention is safe key-succession practice, which keeps the secret out of public documents and out of careless hands while still ensuring it can be recovered. The estate plan can point to where the access information is held without reciting the secret itself, so the will tells the fiduciary the path without becoming the disclosure. Sealed instructions, a secured medium held by a trusted custodian, or a structured arrangement that splits control are all ways to thread this. The principle is constant: the document that grants authority and the secret that grants access are kept apart, so that neither one alone exposes the asset.
Authority, jurisdiction, and the New York plan that holds
The fifth failure mode is the absence of authority to act, compounded by conflicts of jurisdiction and access. Even an heir who knows the asset exists, holds the path to it, and can reach the secret may still lack the legal standing to require a custodian to cooperate. Fiduciaries — an executor of an estate, a trustee, an agent under a power of attorney — need authority that reaches digital assets specifically, because a custodian asked to release a deceased user's holdings will look for the documents that prove the requester is entitled to act. New York has addressed exactly this gap by statute, through its Revised Uniform Fiduciary Access to Digital Assets framework, which governs how fiduciaries may obtain access to a person's digital assets and electronic records.
Jurisdiction and conflicting access rules add a further layer that no key can resolve. The owner may be in New York, the heirs elsewhere, the exchange organized under another country's law, and the assets recorded on a network that belongs to no jurisdiction at all. A platform's terms of service, the place the estate is administered, and the rules that govern the fiduciary can all point in different directions. The chain does not care where anyone lives, but the people and companies who stand between an heir and the asset very much do, and their differing rules can stall a recovery that is technically simple.
The prevention is a plan built so that authority travels with the asset. Fiduciary documents should grant explicit power over digital assets, in terms that custodians and courts recognize, so the executor or trustee is not improvising standing after the fact. The plan should be coordinated with where the estate will actually be administered and with the platforms that hold the assets, so the jurisdictional layers are anticipated rather than discovered. Digital asset estate planning, done in advance, is what converts a private holding into one the right person can lawfully reach. Built carelessly, self-custody protects the asset from everyone, including the family it was meant for. Built with a current inventory, a secure access plan, fiduciary authority, and safe key succession, the same holding passes the way the owner intended.
Self-custody built without a plan protects the asset from everyone — including the family it was meant for.