A letter of instruction — sometimes called a letter of direction, a personal instruction letter, or a Bitcoin estate guide — is an informal document that provides your executor, trustee, or POA agent with the operational roadmap they need to actually manage your Bitcoin. It is not a legal document. It doesn't replace your will or trust. It doesn't need to be witnessed or notarized. And it may be the single most important thing you write for your family.
The gap between legal authority and practical access is where Bitcoin inheritance most often fails. An executor has full legal authority under the will — but the Bitcoin is in cold storage with a seed phrase only the deceased knew. A successor trustee has authority over the trust — but doesn't know which of the three hardware wallets in the safe is still active, or what the PIN is. A POA agent has explicit digital asset authority — but the exchange requires a 2FA code going to a phone that's locked in a hospital room.
A Bitcoin letter of instruction bridges that gap. This guide covers what to include, what to leave out, how to store it securely, and how to keep it current as your Bitcoin holdings and custody arrangements evolve.
What a Letter of Instruction Is (and Isn't)
A letter of instruction is an informal, non-binding document that supplements your formal estate planning documents. Because it's informal:
- It doesn't override the will or trust — it explains and supplements them
- It doesn't need legal formalities — no witnesses, no notary, no specific format required
- It can be updated anytime — unlike a will (which requires legal formalities to amend), you can revise your letter of instruction whenever your custody setup changes
- It should not be included in the will itself — wills become public record in probate; a letter of instruction with private key locations should never be attached to a public document
- It does not grant authority — it provides information; the authority comes from the will, trust, or POA
The letter of instruction should tell your family where to find access credentials — not include the credentials themselves. A letter that circulates among family members, gets scanned, emailed, or photocopied is a catastrophic security risk if it contains seed phrases, PINs, or private keys. The letter points to the secure location. The secure location holds the sensitive information.
The Seven Sections of a Bitcoin Letter of Instruction
Section 1: Who This Letter Is For and When to Open It
Begin by identifying your intended recipients and the triggering conditions. This prevents family members from opening it prematurely — which could compromise the security of your Bitcoin if the letter is read by the wrong person at the wrong time.
To: [Spouse name], [Executor name], [POA Agent name]
Open this letter only if:
— I have passed away, OR
— I have been formally declared incapacitated by a physician and you are acting under my Durable Power of Attorney
Do not share this letter with anyone not listed above without consulting [Attorney name, phone] first.
This letter was last updated: [Date]
If more than 12 months have passed since this date, contact [Advisor name] before acting on any instructions here, as my arrangements may have changed.
Section 2: The Complete Bitcoin Inventory
List every location where Bitcoin is held — exchange accounts, hardware wallets, multisig setups, paper wallets, software wallets, custodial accounts. For each, provide enough information for your family to identify it and know where to look for access credentials — but not the credentials themselves.
Exchange Accounts:
1. Coinbase — Account email: [email address] — Access credentials: in the black notebook in the fireproof safe, shelf 2 — Approximate balance: XX BTC
2. Kraken — Account email: [email address] — Access credentials: same notebook — Approximate balance: XX BTC
Hardware Wallets:
1. Ledger Nano X (black, in safe) — Contains: main cold storage wallet — PIN: in sealed envelope marked "Ledger PIN" in safe — Seed phrase backup: steel plate in fireproof box, master bedroom closet, behind shoe rack
2. Trezor Model T (silver, desk drawer) — Contains: spending wallet, small balance — PIN/seed: same sealed envelope
Multisig Setup (if applicable):
— Arrangement: 2-of-3 multisig
— Key 1: Ledger (above)
— Key 2: held by [Co-signer name, phone]
— Key 3: held by [Attorney name] at [firm]
— Wallet software: Sparrow Wallet, installed on the Dell laptop in my office
— Configuration file: USB drive labeled "MULTISIG" in safe
Section 3: The Legal Documents and Where They Are
List every relevant legal document and its physical and digital location. Your family should not have to search for these during an already stressful period.
— Will: Original at [Attorney name, firm, address]; copy in [safe/filing cabinet]
— Revocable Living Trust: Original at [Attorney name]; copy in [location]. Bitcoin held in trust is titled to "[Your name] Revocable Trust dated [date]"
— Durable Financial POA: Copy in [location]; [Agent name] has authority over Bitcoin accounts
— Healthcare POA / Living Will: Copy in [location]
— Trust certification: Short-form trust certification is in [location] — exchanges may request this instead of the full trust document
— Prior year tax returns (for cost basis): [Location or accountant name]
— Bitcoin cost basis records: [Location — spreadsheet, CoinTracker account, etc.]
Your heirs may receive Bitcoin with a stepped-up basis at your death — but they need to document the fair market value on your date of death to claim it. Additionally, if you had prior taxable events (sales, exchanges, forks) that haven't been reported, your executor needs the cost basis records to file your final income tax return accurately. Missing cost basis records are one of the most common and costly Bitcoin estate administration problems.
Section 4: The Action Sequence — What to Do First
This is the section most letters of instruction miss and the one your family will need most in the first 48 hours. Give them a clear sequence of actions:
Within 24 hours of my death or incapacitation:
1. Call [Estate attorney name, phone] — they will guide you on the legal process
2. Call [Co-signer/multisig keyholder name, phone] — notify them of the situation (they hold one of my Bitcoin keys)
3. Do NOT attempt to access any Bitcoin accounts or wallets yet — wait for attorney guidance
4. Do NOT share login credentials or seed phrase locations with anyone not listed on page 1
Within the first week:
5. Contact [Bitcoin custody specialist/advisor, phone] — they know my setup and can guide the recovery process
6. Retrieve the access credential envelope from [safe location] — open only with attorney or custody specialist present
7. Take a screenshot or record the Bitcoin balance at the date of death for estate/tax purposes
8. Do NOT sell any Bitcoin until you have spoken with [tax advisor name] about cost basis and estate tax implications
Do NOT:
— Enter any seed phrase into any computer or phone that is connected to the internet
— Share seed phrases or PINs over text, email, or phone with anyone
— Transfer any Bitcoin until the estate attorney confirms the correct legal authority is in place
Section 5: Your Key Contacts
List every professional who knows your Bitcoin situation and can help your family navigate it. Include direct phone numbers — not just office numbers.
— Estate Attorney: [Name, firm, direct phone, email] — has copies of will and trust; knows full estate structure
— CPA / Tax Advisor: [Name, firm, direct phone] — has my cost basis records; handles Bitcoin tax reporting
— Bitcoin Custody Specialist: [Name, company, phone] — knows my multisig setup; can guide hardware wallet access
— Financial Advisor: [Name, firm, phone] — manages non-Bitcoin investments
— Multisig Co-Signer 1: [Name, phone, relationship]
— Multisig Co-Signer 2: [Name, phone, relationship] — also holds a copy of the wallet configuration file
— Mining Operations Contact: [Hosting company name, account manager, emergency line] — monthly fees due on the [Xth] of each month; autopay from [account]
Section 6: Ongoing Obligations and Timing
For Bitcoin holders with mining operations, lending arrangements, or recurring fees, this section prevents costly oversights in the critical weeks after death or incapacity.
— Mining hosting fees: $X,XXX/month, autopay from [bank account], due [date]. If missed, hosting may be suspended within [X] days.
— Bitcoin-collateralized loan (if applicable): [Lender name], balance $XXX,XXX, monthly interest payment $X,XXX. If Bitcoin price drops below $XX,XXX, a margin call may be triggered. Contact [lender contact] immediately if this occurs.
— Exchange fee credits / staking: [Any ongoing positions that need monitoring]
— Recurring subscriptions paid in Bitcoin: [Any]
— Annual filings: My Bitcoin holdings may need to be reported on FBAR (FinCEN 114) and Form 8938 if I hold foreign exchange accounts. Consult [CPA name].
Section 7: My Wishes for the Bitcoin
This is not legally binding — your will and trust govern actual distribution. But expressing your intentions in plain language helps your family understand the spirit behind the legal structure. It also reduces family conflict when intentions are clear.
This section is not legally binding. My formal intentions are in my will and trust documents. But I want you to understand why I've structured things the way I have:
— I believe Bitcoin is a long-term generational asset. My strong preference is that you hold it for at least [X] years before selling, unless there is a pressing financial need.
— I have set up an incentive trust structure for the children precisely because I do not want an inheritance to undermine their self-sufficiency. Please read the trust document with the attorney so you understand the distribution standards.
— The mining operation is a business, not just an investment. I have documented my relationships with [hosting company] and believe those relationships have value. Please consult [advisor] before making any decisions to shut down operations.
— If you must sell Bitcoin to pay estate expenses before a distribution decision is made, sell from the exchange accounts first — not from the hardware wallet cold storage.
🏛️ Bitcoin Mining Tax Strategy
If your letter of instruction includes a mining operation, your family will need to understand the tax treatment of mining income, depreciation, and the estate tax implications of a closely-held mining business. Abundant Mines' tax strategy resource provides the foundation.
Get the Mining Tax Strategy →What Not to Include in the Letter
Knowing what to exclude is as important as knowing what to include:
| Item | Include in Letter? | Where It Should Go Instead |
|---|---|---|
| Seed phrases / private keys | ❌ Never | Steel backup plate in physically secure location; multisig keyholder |
| Hardware wallet PINs | ❌ No | Sealed envelope in fireproof safe; memorized by trusted agent |
| Exchange passwords | ❌ No | Password manager with emergency access; printed in sealed envelope in safe |
| Where credentials are stored | ✔ Yes | The letter points to the location — it doesn't contain the credentials |
| Testamentary wishes (asset distribution) | ❌ No | Will and trust — those are legally binding; the letter is not |
| Funeral/burial wishes | ✔ Optional | Often included in a general letter of instruction alongside the Bitcoin section |
| Emotional messages to family | ✔ Optional | Common in general letters of instruction; keep separate from operational Bitcoin section |
| Online account passwords (non-Bitcoin) | ✔ Location only | Point to password manager or sealed envelope |
| Bitcoin transaction history / tax records | ✔ Location only | Point to CoinTracker, spreadsheet, or accountant |
How to Store the Letter Securely
The letter of instruction faces a fundamental tension: it needs to be accessible to your family in an emergency, but secure enough that it doesn't expose your Bitcoin to theft. Here are the recommended approaches by risk level:
For Most Families: Fireproof Safe + Attorney Copy
Store the original letter in a fireproof safe at home. Give a copy to your estate attorney with instructions to release it to the named recipients only in the event of death or documented incapacity. Do not store the letter in a safe deposit box — access to safe deposit boxes is often frozen immediately upon death in many states, precisely when your family needs the letter most.
For Large Holdings: Layered Distribution
For Bitcoin holdings above $1M, consider a layered approach: the general letter (Sections 1, 3, 4, 5, 6, 7) can be distributed to multiple recipients. Section 2 (the complete hardware wallet inventory and access credential locations) goes to one trusted recipient only — typically the primary executor or POA agent — and is stored separately in the safe.
Digital Storage: Proceed With Caution
A digital copy of the letter is convenient but creates security risks. If you maintain a digital version:
- Store it in an encrypted container (VeraCrypt, encrypted 7-Zip archive) with a strong passphrase
- The passphrase itself must be documented somewhere your agent can find it — which creates another layer of the same problem
- Never store a digital version in cloud storage (Google Drive, iCloud, Dropbox) without encryption — cloud accounts can be hacked or subpoenaed
- Do not email the letter to yourself or to family members
The "Dead Man's Switch" Option
Some Bitcoin holders use a "dead man's switch" service — a service that automatically sends instructions to designated recipients if the holder fails to check in at regular intervals. Services like Deadman.io or similar allow you to store encrypted instructions that are released automatically. This ensures delivery even if physical documents are inaccessible, but introduces a third-party dependency. For most families, a well-maintained physical letter with an attorney copy is more reliable and avoids the third-party risk.
Your letter of instruction is only as good as its last update. If you add a new hardware wallet, close an exchange account, restructure to multisig, change attorneys, or significantly increase your Bitcoin holdings — update the letter immediately. A letter with outdated hardware wallet information or a deceased co-signer's phone number is worse than no letter, because it sends your family on a false trail during a crisis. Set a calendar reminder: review the letter every January and immediately after any significant custody change.
The Letter of Instruction vs. Other Estate Planning Documents
Understanding how the letter of instruction fits with your other documents prevents confusion about which document governs what:
| Document | Legally Binding? | Governs | Public? | Needs Attorney? |
|---|---|---|---|---|
| Will | ✔ Yes | Who receives assets at death; executor appointment | ✔ Yes (probate) | ✔ Yes |
| Revocable Trust | ✔ Yes | Trust asset management during life + distribution at death | Generally no | ✔ Yes |
| Durable POA | ✔ Yes | Agent authority during incapacity | No | ✔ Yes |
| Beneficiary Designations | ✔ Yes | Who receives retirement accounts, insurance at death | No | No |
| Letter of Instruction | ✘ No | Where things are, how to access them, who to call | ✔ No (private) | ✔ No |
Bitcoin-Specific Situations That Require Letter Updates
Beyond annual review, these events should trigger an immediate letter update:
- Any change to your custody setup — new hardware wallet, new multisig configuration, new key holders, upgraded to a different wallet software
- Opening or closing an exchange account — update the inventory section
- Moving Bitcoin into or out of a trust — the legal structure governing that Bitcoin has changed
- Change of executor, trustee, or POA agent — the contact list and authority section must be updated
- Change of attorney, CPA, or custody advisor — update the key contacts
- Starting or stopping a Bitcoin-collateralized loan — any ongoing obligation that requires monitoring must be current
- Adding or removing mining operations — the ongoing obligations section changes; hosting contacts must be current
- Moving to a new state — your attorney recommendation may change; storage location may change
- Any major life event — marriage, divorce, new child, death of a co-signer — review the entire letter
📋 Bitcoin Mining Host Due Diligence: 36 Questions
If your letter of instruction includes a mining operation and your family needs to evaluate whether to continue or wind down hosting after your death or incapacity, these 36 questions help them assess the hosting relationship from scratch — including custody of mined Bitcoin, contract assignment, and emergency contact procedures.
Get the 36-Question PDF →The One-Page Emergency Card
For families with a complex Bitcoin setup, consider creating a single laminated card that your executor or POA agent can keep in their wallet or home safe. It contains only:
- The location of the full letter of instruction
- The estate attorney's direct phone number
- The Bitcoin custody advisor's emergency number
- The primary co-signer's number (if multisig)
- A single sentence: "Do not access any Bitcoin before calling these numbers."
This card contains no sensitive information — it's a triage tool. In a crisis, your family will be overwhelmed. A laminated card with four phone numbers and a location reference is more useful than a 12-page letter they have to find and read under pressure.
How Professional Advisors Use Letters of Instruction
The best estate attorneys, financial advisors, and Bitcoin custody specialists use your letter of instruction as a living working document. When you engage them, they should:
- Ask to see your existing letter of instruction (or help you create one if it doesn't exist)
- Verify that their contact information appears correctly in the letter
- Confirm that the letter's description of your legal structure matches the actual documents on file
- Review Section 2 (the Bitcoin inventory) to confirm it matches what they know about your custody arrangements
- Provide you with an updated version of the letter after any significant change to your plan
If your advisors have never mentioned a letter of instruction, or don't know what one is, that's a signal about the sophistication of their Bitcoin estate planning practice.
The Bottom Line
The best will in the world cannot tell your executor which safe the hardware wallet is in. The most carefully drafted trust cannot tell your successor trustee which of three exchange accounts holds the Bitcoin that needs to be distributed. And the most explicit durable POA cannot give your agent the seed phrase they need to access a cold storage wallet.
A Bitcoin letter of instruction does not replace any of those documents. It completes them. It is the operational layer that converts legal authority into actual access — the difference between an estate that is administered smoothly and one that loses Bitcoin to confusion, delay, or a family member who accidentally triggered a wipe on a hardware wallet they didn't know how to use.
Write it. Store it securely. Update it when things change. Give the location to the people who need it. That's it. It takes an afternoon. And it may save your family from a crisis that legal documents alone cannot prevent.
→ Bitcoin Durable Power of Attorney: Legal Authority for Incapacity
→ Bitcoin in a Will: What Happens at Death
→ Bitcoin Directed Trusts: Institutional Structure With Self-Custody
→ The Complete Bitcoin Estate Planning Guide
Frequently Asked Questions
Is a letter of instruction legally enforceable?
No — it is informational only and does not override your will, trust, or other legal documents. It cannot change who receives assets (the will and trust govern that), cannot grant authority (the POA does that), and cannot be used as a standalone instruction to a financial institution. Its value is operational: it tells the right people where things are and what to do first. Think of it as the user manual for your estate, not a legal document.
Should I include the letter of instruction with my will?
Absolutely not. Wills become public record in probate — meaning anyone can read them. A letter of instruction attached to a will, or filed with a court, becomes equally public. It should be stored separately and privately. Your executor should receive it directly (and know where it is), not through the court system.
Can I write it myself or do I need an attorney?
You can write it yourself — no legal formalities are required. However, your estate attorney should review it to confirm that it accurately describes the legal structure and does not inadvertently contradict the will or trust. The attorney can also help identify gaps (missing accounts, outdated contacts, custody arrangements that have changed since the last update).
What if I have Bitcoin in multiple countries?
Your letter of instruction should cover all Bitcoin regardless of where it's held — but the legal documents governing it may be more complex. Foreign exchange accounts may require your executor to engage local counsel in the relevant jurisdiction. The letter should specifically flag any foreign accounts and note that special legal advice is required for those assets. FBAR and FATCA reporting obligations should also be noted for your executor and CPA.
My children are minors. Who gets the letter?
For families with minor children, the letter goes to the surviving spouse, the executor (if not the spouse), and the trustee of any trust holding Bitcoin for the children's benefit. If the other parent is also deceased, the guardian of the minor children should receive a version of the letter — but their access to the Bitcoin itself should be governed by the trust, with the trustee controlling distributions, not the guardian directly. This structural separation is exactly why a trust is essential when minor children are involved.