Your bitcoin does not care that you have a will. Probate law and self-custody run on different operating systems, and a will is only the bridge if you build the rest of it. The will names who should inherit; it cannot move a single satoshi. Your executor needs three things at once — legal authority, technical access, and documentation a court will accept. Lose any one of them and your heirs inherit a locked wallet and a court fight.
Why a Will Alone Doesn't Transfer Crypto
Probate courts transfer titled assets. A house has a deed. A brokerage account has a beneficiary form. A Trezor has a seed phrase and no registrar. A judge can order your executor to distribute "all cryptocurrency owned by the decedent," and that order means nothing if nobody knows the device exists or how to open it.
Most estate plans drafted before 2020 fall into this gap. Attorneys wrote boilerplate about "digital assets" without distinguishing custodial exchange accounts from self-custodied wallets — two assets that follow completely different legal paths.
Custodial vs. self-custody: two different legal problems
Coins on an exchange are a claim against a company. Your executor contacts the platform, submits a death certificate, and waits. The legal requirement is mostly paperwork, governed by the exchange's terms of service plus state probate rules.
Coins on a hardware wallet are property you physically control. No company will help. Here the legal requirement shifts to proving ownership and transferring the seed phrase or device in a way that holds up under scrutiny.
What courts typically want to see
Judges and executors look for evidence tying a specific wallet to you: screenshots of addresses, exchange withdrawal records, a written inventory. Vague references to "some crypto" create exactly the ambiguity that turns siblings into litigants.
The Documents That Actually Matter
A complete plan stacks several instruments, because no single document does everything.
- Last will and testament — names the beneficiary and gives the executor authority to administer digital assets.
- Separate crypto inventory — lists device types, wallet locations, and approximate holdings, but not the seed phrase itself.
- Letter of instruction — explains how to access devices and where the seed backup lives.
- Trust (in some states) — can move assets outside probate entirely, which matters because probate is public and slow.
The inventory is where people make the expensive mistake. Putting a full seed phrase into a will is a disaster waiting to happen. Wills become public record during probate in most jurisdictions, so anyone who reads the filing can drain the wallet before your heirs get a hearing.
A scenario worth studying
Say you hold 0.4 BTC on a Trezor and 12 ETH on an exchange. Your will says "I leave my cryptocurrency to my daughter Maya." Your executor opens probate, the will is filed publicly, and your son contests the distribution. Maya has the device but no PIN, and your seed backup sits in a safe deposit box that requires a court order to open. That's six months of legal fees before anyone touches a satoshi. A letter of instruction and a named beneficiary on the exchange account would have cut most of it.
Where Trezor Fits Into the Legal Picture
Trezor devices are self-custody tools, which means the legal burden lands entirely on your estate planning. The company cannot freeze, recover, or transfer your coins. No support ticket will help your executor.
That's not a flaw. It's the tradeoff for holding assets no third party can seize. But it means your documentation has to be genuinely good.
Practical steps for a Trezor holder
Write down the device model and where it's stored. Keep the seed phrase backup separate from the device, in a location your executor can reach without a court order. Consider multisig or a seed split across trusted parties if the holdings justify it. And tell at least one competent person the plan exists.
What not to do
Don't email yourself the seed phrase. Don't store it in a cloud note. Don't assume your spouse knows how a hardware wallet works. A short recorded walkthrough, stored securely, solves more problems than a twenty-page legal brief.
State Law and the Changing Rules
Most U.S. states have adopted some version of the Revised Uniform Fiduciary Access to Digital Assets Act, which gives executors limited authority over digital accounts. Coverage varies, and crypto-specific guidance remains thin in many jurisdictions. Some states treat virtual currency explicitly; others lump it under general property rules.
Tax law adds another layer. In the U.S., inherited crypto generally gets a stepped-up cost basis as of the date of death, which can wipe out capital gains on appreciation during your lifetime. Your executor still needs records to establish that basis. Exchange statements and wallet transaction history serve that purpose.
Frequently asked questions
Can I legally put my seed phrase in my will?
You can, but you shouldn't. Wills become public record in most probate proceedings, so anyone who requests the file can read your seed phrase and drain the wallet. Use a separate letter of instruction stored privately, and reference its existence in the will without including the phrase itself.
Does my executor need a court order to access my crypto?
For custodial accounts, usually not — most exchanges have a documented process for estate claims. For self-custodied wallets, there's no company to petition. Your executor needs the device, the PIN, and the seed backup, which is why a letter of instruction matters more than any legal filing.
Is crypto subject to probate?
In most cases, yes, unless it's held in a trust or has a valid beneficiary designation. Probate adds time, cost, and public exposure. A revocable trust that holds your wallet access can move the process outside court entirely, though setup costs vary by attorney and state.
What happens if no one knows I own crypto?
The assets stay locked. Exchanges don't hunt for heirs, and no government database tracks self-custodied wallets. Unclaimed crypto effectively disappears. A written inventory, even a simple one, is the single highest-value document in your plan.
Start tonight: write one page listing every wallet you own, where each device lives, and who should receive it. Store it somewhere your executor can find it. That page is worth more than most wills.