Crypto inheritance planning is the work of making sure the people you choose can find, access and legally receive your cryptoassets after you die or lose capacity, without exposing the keys to theft while you are alive. It differs from ordinary estate planning because a blockchain has no account manager to call: whoever holds the key controls the coins, and a lost key usually means permanently lost assets. This guide explains how key succession works for self-custody and custodial holdings, how multisig and timelocks can help, what a letter of instruction should and should not contain, and the tax and legal points heirs meet in the UK and US. General online accounts are covered in Protecting Your Digital Legacy Guide; this page goes deeper on crypto. It is security and planning information, not legal, tax or investment advice.
Key takeaways
- Two problems pull in opposite directions: heirs need enough information to recover the assets, while thieves must not get enough to steal them; good plans split the two.
- Never put a seed phrase in a will: wills often become public documents after probate, so the will should point to a letter of instruction, not contain secrets.
- Multisig removes the single point of failure: a 2-of-3 arrangement lets an executor and one other key holder recover funds without any one person holding everything.
- Custodial holdings follow the provider's bereavement process: heirs need to know the account exists, and the estate will need death certificates and grant of representation.
- Test the plan: a recovery that has never been rehearsed with a small amount is a hope, not a plan.
What it is
Crypto inheritance covers every route by which someone else can legitimately take control of your digital assets: self-custody wallets (software, hardware or paper), multisig vaults, smart contract accounts, and balances held for you by exchanges or custodians. For self-custody, the asset is effectively the ability to produce a valid signature. Most wallets derive all their keys from a BIP-39 mnemonic: 12 to 24 words, optionally combined with a passphrase. The passphrase is not stored anywhere; BIP-39 mixes it into the seed with PBKDF2 (2,048 iterations of HMAC-SHA512), so an heir who has the words but not the passphrase sees a different, usually empty, wallet.
The law increasingly treats these assets as property. In England and Wales the Property (Digital Assets etc) Act 2025 confirms that a thing that is digital or electronic in nature is not prevented from being the object of personal property rights merely because it is neither a thing in possession nor a thing in action. In the US, the IRS treats digital assets as property for tax purposes. Legal ownership passing to an heir does not, however, give them the key: that is the practical gap inheritance planning closes.
How it works
The building blocks
| Method | How heirs get access | Main risk | Fits best when |
|---|---|---|---|
| Seed phrase backup plus letter of instruction | Executor retrieves the backup from a stated location and follows written steps | Anyone who finds the backup can steal the funds; backups degrade or get lost | Small holdings, simple single-signature wallets |
| Split storage (words and passphrase in different places) | Heir combines both parts, each held by a different person or location | Losing either part loses everything | Moderate holdings, trusted family |
| Multisig, for example 2-of-3 | Executor and one other key holder sign together; you hold keys while alive | Complexity; heirs must understand wallet configuration | Significant holdings, long-term savings |
| Timelocked recovery path | A backup key can spend only after a set time without activity | Requires careful wallet software and periodic refresh | Technically confident holders |
| Custodial account with nominated contacts | Provider's bereavement team releases assets to the estate | Account unknown to heirs; provider failure; paperwork delays | Holders who prefer not to self-custody |
| Smart contract account with guardians | Guardians approve a change of owner after a delay | Guardian collusion or loss; contract risk | Ethereum users already on smart wallets |
Multisig and descriptors
In a multisig wallet any M of N keys can sign. For inheritance, a common design is 2-of-3: you hold two keys (for example, two hardware wallets in different places) and a trusted executor or professional holds the third. While alive you never need the third key; after death, the executor's key plus one of yours, located through the letter of instruction, moves the funds. Bitcoin wallets describe multisig setups with output script descriptors (BIP-380 and BIP-383, both Deployed), which include an 8-character checksum. Heirs need the descriptor, or the full set of extended public keys and the script type, to rebuild the wallet: having two keys alone is not enough. Keep the descriptor with every key backup. Signing across several devices usually uses Partially Signed Bitcoin Transactions (BIP-174). Organisational multisig practice is covered in the Multisig Treasury Operations Guide.
Timelocks: the honest version of a dead man's switch
Bitcoin supports absolute timelocks (OP_CHECKLOCKTIMEVERIFY, BIP-65) and relative timelocks (BIP-68 and OP_CHECKSEQUENCEVERIFY, BIP-112), all Deployed. A wallet can define a spending policy such as "my key at any time, or my heir's key once the coins have not moved for about a year". You reset the clock by moving the coins periodically. Miniscript (BIP-379, still Draft) makes such policies easier to express and analyse. Online "dead man's switch" services that email secrets after inactivity are a different thing: they require you to give a third party the secret or a way to it, which concentrates risk.
The letter of instruction
- Include: a list of holdings and where they are (exchanges by name, wallet types, networks used), where backups and hardware devices are stored, which wallet software to use, the multisig descriptor location, contacts for professionals or other key holders, and step-by-step recovery instructions written for a non-expert.
- Do not include: the seed words, passphrase or PINs in the same document. Keep the letter separate from the secrets it points to, and update it when holdings change.
- Warn heirs about scams: state that nobody legitimate will ask for the seed phrase, and that "recovery" services promising to retrieve lost funds for a fee are a known fraud. See the Crypto Scam and Drainer Guide.
Step-by-step setup
- Inventory every holding, including small balances on exchanges and tokens on other networks.
- Choose a method per holding from the table above, based on value and your heirs' technical comfort.
- Create durable backups (metal plates resist fire and water better than paper) and store them in separate secure places.
- Write the letter of instruction and tell your executor where it is, without giving them the secrets now unless that is the design.
- Reference the letter in your will and discuss digital assets with your solicitor or estate attorney.
- Rehearse: have the executor recover a small test wallet using only the instructions, then fix what confused them.
- Review yearly and after any change of wallet, device or exchange.
Why it matters
Lost keys are usually permanent. HMRC's Cryptoassets Manual (CRYPTO22400) notes that losing a private key is not itself a disposal for Capital Gains Tax, because the tokens still exist on the ledger, although a negligible value claim may be possible where there is no realistic prospect of recovery. For heirs that means value can be taxable in an estate yet inaccessible. On tax generally:
- UK: HMRC's manual (CRYPTO22600) says there are no statutory rules on the location of cryptoassets for Inheritance Tax, so general principles apply, and for Capital Gains Tax an exchange token is generally located where its beneficial owner is resident. Executors need valuations at date of death.
- US: the IRS treats digital assets as property; gifts of digital assets are reported on Form 709, and brokers report digital asset sales on Form 1099-DA (gross proceeds from 1 January 2025, basis for certain transactions from 1 January 2026), which helps executors trace custodial holdings.
Holdings on exchanges also need protecting while you are alive, because an account takeover before death removes the inheritance. See the Crypto Exchange Account Security Guide.
Choosing an approach by situation
| Situation | Sensible starting point | Watch out for |
|---|---|---|
| Small amounts on one exchange | Tell your executor the account exists; keep statements with your papers | Account recovery depends on email and phone access the estate may lose |
| Single hardware wallet with savings | Durable seed backup in a secure place, letter of instruction, passphrase stored separately | One person finding both parts |
| Larger long-term holdings | 2-of-3 multisig with one key held by the executor or a professional, descriptor stored with every key | Heirs not knowing which wallet software can rebuild the setup |
| Heirs with little technical knowledge | A named technical helper you trust, plus plain-language steps tested by the heir | Strangers offering to "help" once your death is known |
| Holdings across many networks and tokens | A full inventory, reviewed yearly, consolidated where practical | Forgotten balances on networks the heir has never heard of |
Whatever the approach, the executor will usually need a date-of-death valuation for each holding and a record of where each asset was held, for probate and for tax. Exchange statements and wallet export files kept with the letter of instruction save weeks of work.
Common misconceptions
- "My will covers it." A will gives legal title; it does not give the key, and putting the key in it can expose it publicly.
- "The exchange will sort it out." Only if heirs know the account exists and can prove entitlement; self-custody wallets have no one to ask.
- "The seed words are enough." Not if a BIP-39 passphrase, a multisig descriptor or a specific derivation path was also used.
- "Giving my family a copy now is safest." It multiplies the places a thief can find it and the people who can make a mistake.
- "A hardware wallet is the backup." Devices fail, get lost or are reset after wrong PIN attempts; the backup is the recovery material, documented. See the Hardware Wallet Guide.
Related concepts
- Shamir and threshold schemes: splitting a secret or a signing key so that any M of N shares reconstruct or sign. See the MPC Wallet and Threshold Signing Security Guide.
- Social recovery wallets: smart contract accounts where guardians can rotate the owner after a delay, covered in the Account Abstraction and Smart Wallet Security Guide.
- Lasting power of attorney: incapacity needs planning too; the same letter of instruction should cover who acts if you cannot.
- Organisational key succession: businesses face the same problem when a key holder leaves; the controls mirror those in the Crypto Wallet Security Guide.
Practitioner checklist
- List every holding, wallet type, network and exchange account in one inventory.
- Store seed backups durably, in at least two separate secure locations.
- Keep passphrases and multisig descriptors documented and separate from the seed words.
- Write a letter of instruction for a non-expert and keep it apart from the secrets.
- Reference the letter in your will; never write keys into the will itself.
- Consider 2-of-3 multisig or a timelocked recovery path for significant holdings.
- Rehearse recovery with a small test wallet and your executor.
- Review the plan every year and after any change in wallets or providers.
Standards and references
- Bitcoin BIPs: BIP-39 Mnemonic code for generating deterministic keys
- Bitcoin BIPs: BIP-383 Multisig Output Script Descriptors
- Bitcoin BIPs: BIP-65 OP_CHECKLOCKTIMEVERIFY
- Bitcoin BIPs: BIP-112 CHECKSEQUENCEVERIFY
- legislation.gov.uk: Property (Digital Assets etc) Act 2025, section 1
- HMRC: Cryptoassets Manual CRYPTO22400, losing private keys
- HMRC: Cryptoassets Manual CRYPTO22600, location of exchange tokens
- IRS: Digital assets
Related NHI Mgmt Group resources: Protecting Your Digital Legacy Guide · Crypto Wallet Security Guide · Hardware Wallet Guide · Multisig Treasury Operations Guide