Crypto Inheritance

Crypto Inheritance: Seed Phrases in Estate Plans

The estate planning challenge of cryptocurrency is unique in the history of wealth transfer. No prior generation of asset holders has faced the combination of assets that are globally accessible, require no intermediary to transfer, leave no paper trail, and are permanently inaccessible if the access credentials are lost—while simultaneously being accessible to anyone who possesses those credentials, regardless of their authorization.

A traditional brokerage account with $500,000 in index funds has a defined inheritance process: the executor presents a death certificate, the institution verifies the beneficiary designation, and assets transfer. The institution is an intermediary that facilitates this process, with verification requirements that protect against unauthorized access.

Bitcoin in a self-custodied wallet has no such process. There is no institution, no customer service, no legal override. Whoever has the seed phrase has the Bitcoin. If no one has the seed phrase—or if no one knows to look for it, or where it's stored—the Bitcoin is gone.

THE DIGITAL ASSET INVENTORY: THE STARTING POINT

Estate planning for crypto begins with documentation that tells survivors what exists and where to find it. This documentation must accomplish two competing goals: it must be accessible to authorized heirs after death, and it must not be accessible to unauthorized parties before or after death.

The digital asset inventory should include, for each crypto holding:

The platforms or wallets where cryptocurrency is held. For exchange-held crypto: the exchange name, the account login email, and how two-factor authentication works (what device/app generates the codes).

For self-custodied crypto: a description of the hardware wallet or software wallet used, where the physical device is located, and separate documentation of where the seed phrase is stored.

The existence and location of the seed phrase(s). Not the seed phrase itself in the main inventory—the seed phrase itself must be stored separately, as described below.

Any accounts holding NFTs, DeFi positions, staking positions, or other crypto assets.

This inventory should be kept current and should reference the seed phrase's location without containing the seed phrase itself in the same document.

SEED PHRASE STORAGE OPTIONS

The seed phrase is the most sensitive document in the self-custodied crypto estate. Several approaches exist, each with different tradeoffs:

Sealed envelope in a fireproof safe: Write the seed phrase on durable paper or a metal backup plate, place it in a sealed envelope, and store in a fireproof safe with the combination documented separately in the estate plan. The executor and/or trustee must know where the safe is and how to access it. This is the simplest approach with no digital vulnerability.

Metal backup plates: Products like Cryptosteel, Bilodeau, or CryptoTag allow stamping or engraving the seed phrase onto stainless steel—resistant to fire, water, and physical damage that would destroy paper. These cost $50 to $100 and provide more durable storage than paper for long-term estate planning.

Split storage: Divide the seed phrase into multiple parts stored separately, each insufficient alone to reconstruct the phrase. For a 24-word seed phrase, storing words 1-12 in one location and words 13-24 in another provides basic protection. Shamir's Secret Sharing (SSS)—a cryptographic method implemented in some hardware wallets—divides the phrase into N shares where only a threshold number (e.g., 3 of 5) are needed to reconstruct it. This allows geographic distribution of shares across trusted parties without any single party having full access.

Third-party crypto inheritance services: Companies like Casa and Unchained Capital offer multi-signature wallet setups designed for inheritance. These typically involve distributing signing keys across multiple parties (the owner, a trusted person, and the service provider), where a defined threshold must cooperate to execute a transaction. The inheritance process is managed through the service, providing more structure than self-managed seed phrase storage.

Attorney or trust company custody: Some estate attorneys and trust companies are developing capabilities to hold seed phrases as fiduciaries—holding them in secure storage with defined release conditions (presentation of a death certificate, executor authorization). This approach provides professional custody with legal structure but requires finding a provider with this specific capability and the trustworthiness to hold it responsibly.

THE LEGAL AUTHORIZATION: CONNECTING THE SEED PHRASE TO THE ESTATE PLAN

Possessing the seed phrase is factually sufficient to access the cryptocurrency. Legal authorization—making clear that the person who has the seed phrase is entitled to the crypto as a legal matter—is important for legitimacy and for preventing disputes among heirs.

The estate planning documents (will, revocable living trust) should explicitly reference cryptocurrency holdings and designate who is entitled to receive them. Language should:

Specify that the estate includes cryptocurrency and digital assets.

Authorize the executor or trustee to access digital assets using credentials and seed phrases found according to the digital asset inventory.

Designate specific beneficiaries for crypto holdings, consistent with the overall estate distribution scheme.

Consider using a specific bequest (naming a particular person to receive the crypto) rather than a general residuary distribution, to avoid confusion about which heir has the right to retrieve the seed phrase.

In states that have adopted RUFADAA (Revised Uniform Fiduciary Access to Digital Assets Act), the legal authority of executors and trustees to access digital assets is statutory—but the practical limitation remains: the legal right to access is useless if the technical means (seed phrase) are not accessible.

THE PROBATE TIMING PROBLEM

One practical challenge in crypto inheritance: probate takes months to years. A bitcoin bull market might occur during the probate period. An executor with legal authority but without the technical ability to move the crypto—or without instructions to hold vs. sell—may face questions about whether inaction during a market move constituted a breach of fiduciary duty.

For large crypto holdings intended to be inherited, a trust—rather than a will—may be preferable precisely because trust assets bypass probate. A revocable living trust that holds or references the crypto assets, with a successor trustee who knows the location of the seed phrase (or has the seed phrase as part of a multi-signature arrangement), can transfer crypto much more quickly than a probate process permits.

The trust's investment policy should include guidance on how the successor trustee should manage crypto holdings: hold for a defined period, sell immediately upon death, or a specified strategy. Without guidance, the trustee faces uncertainty about whether managing a volatile asset requires active decisions they're not qualified to make.

THE STEP-UP IN BASIS: A SIGNIFICANT INHERITANCE BENEFIT

Like other property, cryptocurrency inherited at death receives a stepped-up cost basis equal to the fair market value at the date of death. This eliminates the capital gains tax on all appreciation that occurred during the decedent's lifetime.

Bitcoin purchased for $8,000 and worth $60,000 at death passes to the heir with a $60,000 basis. If the heir sells at $60,000, zero capital gains tax. If the heir holds and sells at $80,000, capital gains tax is owed only on the $20,000 gain above the stepped-up basis.

For estates with large unrealized crypto gains, this step-up is extraordinarily valuable—often representing tens or hundreds of thousands of dollars in avoided capital gains tax. It is a strong argument for holding crypto until death rather than gifting it during life, which would transfer the original carryover basis rather than the stepped-up basis.

The stepped-up basis for inherited crypto requires knowing both the date of death and the fair market value at that date for each crypto asset. Exchange records, blockchain data, and price history from reputable data providers (CoinMarketCap, CoinGecko) should be preserved and accessed to document the date-of-death value for each holding. The executor or trustee should request price documentation at the date of death as early in the estate administration process as possible.

Cryptocurrency's combination of enormous potential value, technical access requirements, and total loss risk upon access failure makes it the estate planning area requiring the most careful advance preparation of any asset class. The planning itself is not complicated—it is documentable and achievable within a standard estate plan. What it requires is being done.