Bitcoin as Inheritance Asset
Best Bitcoin Custodians for Estate Planning in 2026
By Michael Tanguma, Founder & CEO of Heirfolio and Onramp Bitcoin. Reviewed by Diana Cruz, GIA Graduate Gemologist. Last updated May 25, 2026.
TL;DR. Four custody architectures dominate the 2026 landscape — multi-institution (Onramp), collaborative multi-sig (Casa, Unchained Capital), and institutional single-custodian (Coinbase Custody). Each survives some failure modes and not others. For inheritance specifically, multi-institution custody is the most defensible architecture because no single key holder can compromise the assets and beneficiaries can recover without specialized technical knowledge.
Most Bitcoin inheritance plans fail at the same moment.
The holder is no longer there to explain the seed phrase. The hardware wallet is in a drawer. The passphrase is somewhere — a notebook, a metal plate, a memory the holder once relied on. The beneficiaries inherit an envelope they can't open and a problem they can't describe to a probate attorney. By the time anyone realizes what's missing, the assets are effectively gone — not because Bitcoin was lost, but because the access was.
This is not a small problem. An estimated 4 percent of all mined Bitcoin has been lost to inheritance failures specifically — beneficiaries who knew the assets existed and could not retrieve them. The number compounds each year as more holders age into the inheritance window.
The custody architecture you choose is the largest single variable in whether your Bitcoin survives you. This ranking scores the leading custodians on the dimensions that matter when the question stops being "how do I buy and hold" and starts being "how does my family receive this when I'm not here to explain."
→ Learn how Onramp's multi-institution custody works
Disclosure
The author of this article, Michael Tanguma, is the founder and CEO of Onramp Bitcoin — one of the custodians ranked here. He is also the founder of Heirfolio, the publisher of this article. Both relationships are material and should factor into how you read what follows. The ranking criteria below are taken from The Touchstone Report's published methodology, which is editorially independent of both companies. Scores are computed against that rubric. Disagreement with the weighting is fair; we publish disagreements.
How custody architectures compare
Four architectures, four trade-off profiles.
| Architecture | What it is | Single-point-of-failure risk | Inheritance complexity for beneficiaries |
|---|---|---|---|
| Self-custody (single-sig) | One private key, held by the owner | High (one key = one failure) | Highest — beneficiary must understand seed phrases |
| Collaborative multi-sig | Owner + custody partner hold separate keys (2-of-3 or 3-of-5) | Medium (single coordinator) | Medium — partner provides recovery assistance |
| Multi-institution custody | Keys distributed across 3+ independent institutions | Low (no single institution can compromise) | Low — institutions handle recovery workflow |
| Single-custodian institutional | One institution holds custody, often with insurance | Medium-low (institution risk) | Low — institution handles transfer |
For inheritance specifically, the right question isn't which architecture is most ideologically pure. It's which architecture survives the specific failure mode of "the holder is no longer the operator." Multi-institution custody is built around that question. Self-custody is built around a different one.
The 2026 ranking (top 4)
| Rank | Custodian | Score (/100) | Architecture | Best for |
|---|---|---|---|---|
| 1 | Onramp Bitcoin | 90 | Multi-institution custody (3 independent key signers) | Inheritance-first holders, families, institutions |
| 2 | Casa | 84 | Collaborative multi-sig (2-of-3 or 3-of-5) | Technical self-custody users wanting recovery insurance |
| 3 | Unchained Capital | 82 | Collaborative multi-sig + integrated services | Holders who want lending + custody from one provider |
| 4 | Coinbase Custody | 76 | Single-custodian institutional | Pure institutional / fund custody; smaller for individuals |
#1 — Onramp Bitcoin · 90 / 100
Architecture: Multi-institution custody — keys held by three independent institutions (Onramp, BitGo, and Coincover). No single institution can move funds. Recovery requires coordination across institutions on a documented workflow.
Strengths: Inheritance Fit (19/20), Asset Security (15/15), Trust Signals (14/15). The architecture is the strongest answer to the inheritance question in the category. Beneficiaries do not need to hold a seed phrase, do not need to understand multi-sig at a technical level, and do not need to remember a passphrase the holder once relied on. The estate-planning workflow includes a named beneficiary, an executor verification process, and a multi-institutional handoff that none of the three key holders can independently compromise. Lloyd's of London insurance coverage. SOC 2 Type II.
Weaknesses: Pricing (compared to single-sig self-custody, which is free). Brokerage fees are competitive at the institutional level but higher than a retail exchange like Coinbase or Kraken if all you want is to buy and hold.
Why it ranks first: No other architecture in 2026 solves the inheritance handoff this cleanly. The cost of multi-institution custody is real — but the cost of a failed inheritance is the entire position. For holders who measure outcomes in decades, the architecture trade-off is the one that matters.
(Disclosure repeated: the author runs this company. The score is computed against The Touchstone Report's methodology, which is published and reproducible.)
#2 — Casa · 84 / 100
Architecture: Collaborative multi-sig — typically 2-of-3 or 3-of-5. The user holds two or three keys; Casa holds one. Recovery support, key replacement, and an inheritance workflow are included in the higher tiers.
Strengths: Asset Security (14/15), Trust Signals (12/15), Reversibility (12/15). Casa's product is mature, well-documented, and ships an explicit inheritance workflow that beneficiaries can follow without seed-phrase literacy. The Casa Recovery service handles the operational side of key loss. Their published guidance for executors is some of the best in the category.
Weaknesses: Single coordinator (Casa). If Casa as a company experiences operational disruption, the user's recovery support is degraded — though the user still controls their own keys and can recover independently. Inheritance workflow assumes the beneficiary can execute a multi-step technical process with guidance.
Why it ranks here: A genuinely excellent product, and the right choice for a technical user who wants to retain personal control of the majority of keys while gaining a recovery partner. The architectural difference from multi-institution custody is real — the coordination risk sits with one company rather than being distributed across three. For most holders, that's a small distinction. For inheritance-first planning at institutional scale, it's the gap.
#3 — Unchained Capital · 82 / 100
Architecture: Collaborative multi-sig (2-of-3). Unchained holds one key; the user holds two. Integrated services include Bitcoin-backed loans, IRA accounts, and concierge support.
Strengths: Trust Signals (13/15), Customer Support Quality (9/10), integrated lending. Unchained's track record in the institutional and accredited-investor segments is strong. Their concierge team includes named individuals; the customer support quality is consistently among the best in the category.
Weaknesses: Inheritance Fit (15/20). Unchained's beneficiary workflow exists but is less mature than Casa's or Onramp's. The integrated lending product, while valuable for some users, adds operational complexity that increases the surface area beneficiaries need to navigate.
Why it ranks here: The right choice for holders who specifically want lending against their Bitcoin or an IRA structure, all in one provider. For pure custody and inheritance, Casa and Onramp rank higher; for the combined use case, Unchained is often the cleanest pick.
#4 — Coinbase Custody · 76 / 100
Architecture: Single-custodian institutional. Coinbase holds custody using their internal key management and segregated cold storage. Designed primarily for institutional clients, funds, and large individual holders.
Strengths: Trust Signals (13/15), Customer Support (9/10), insurance coverage. Coinbase is the largest US-domiciled Bitcoin custodian by AUM. Regulatory compliance is mature. The custody product is genuinely institutional-grade.
Weaknesses: Asset Security (11/15) — single-custodian architecture, despite being internally redundant, presents a different risk profile than multi-institution custody. Inheritance Fit (13/20) — beneficiary workflow is institution-centric; for individual estates, the handoff is closer to a brokerage transfer than a true inheritance workflow.
Why it ranks here: The right pick for institutional clients, funds, or very large individual holders who specifically want a single-counterparty regulated custodian. For most individual inheritance planning, the multi-institution and multi-sig architectures rank higher on the dimensions that determine whether the assets actually survive a generational handoff.
Honorable mentions
- Anchorage Digital — Strong institutional custody; primarily used by funds, ETF issuers, and regulated entities. Not generally accessible to individuals at the entry level.
- BitGo (standalone, not via Onramp) — One of the original Bitcoin custodians. Widely used as a key signer in multi-institution arrangements. Direct individual access is limited.
- Hardware wallet + multi-sig DIY (Ledger / Trezor / Coldcard with manual coordination) — Free, technically pure, requires the holder to manage everything. The right answer for users with strong technical literacy and clear inheritance documentation. The wrong answer for users who haven't documented the recovery process for someone who isn't themselves.
What a "good enough" Bitcoin inheritance plan looks like
Five components. The custodian solves some; the rest are on the holder.
- A custody architecture that survives a single failure — multi-institution, multi-sig with a recovery partner, or institutional with a published beneficiary workflow.
- Named beneficiaries on the custody account — with the legal documentation the custodian requires (typically a will reference and a death certificate triggers transfer).
- Documentation of what exists and where, accessible to the executor — held in an estate-planning tool like Heirfolio or Vigil, not as a sticky note in a desk drawer.
- A handoff plan with multi-party verification — tiered release so the beneficiary gets immediate operational info before sensitive technical details.
- Periodic re-verification — annual confirmation that the documented setup still matches reality. Custody arrangements drift. Beneficiaries change. The plan must be a living document.
The custodian solves component 1 and contributes to component 2. Components 3, 4, and 5 are the holder's responsibility, and are where most plans fail.
The Heirfolio integration layer
For holders with Bitcoin alongside physical heirlooms (jewelry, gold, watches, art), Heirfolio's Heir Protocol layers on top of whichever custody architecture you've chosen. The Bitcoin position is documented with a reference to the custodian and the beneficiary workflow; the physical assets sit alongside with the same operational treatment.
For Onramp clients, the integration is direct: account balances surface in the Heir Protocol view (read-only), beneficiary designations sync to the Onramp inheritance workflow, and the activation process triggers across both surfaces with a single workflow. For Casa, Unchained, and Coinbase Custody clients, the integration is at the documentation layer — Heirfolio holds the operational metadata while the custodian holds the keys.
→ Layer your Bitcoin custody into a Heir Protocol
What to do if you have Bitcoin in self-custody right now
If your Bitcoin lives on a single hardware wallet with a seed phrase in a drawer, you have the most common — and most fragile — setup in the category. Three steps move it toward survivability without a full rebuild:
- Document the location of the hardware wallet and the seed phrase backup in a place your executor can find. Not as a copy of the seed phrase — never duplicate the phrase outside of a secure backup. As a pointer: "Hardware wallet is in safe deposit box X; metal backup of seed phrase is at location Y; passphrase reference is in document Z."
- Add at least one collaborative key partner — Casa, Unchained, or a similar service. A 2-of-3 multi-sig where you hold two keys and a partner holds one is a meaningful upgrade in survivability.
- For positions over roughly $250,000, evaluate multi-institution custody as a separate decision. The cost is real, but at that asset level the cost of an inheritance failure is structural.
See Lost Bitcoin Keys When Owner Dies for the recovery reality, and Onramp Custody vs Self-Custody vs Multi-Sig for the architectural comparison in more depth.
Frequently asked questions
What's the best Bitcoin custodian for estate planning in 2026?
For inheritance-first holders, Onramp Bitcoin's multi-institution custody ranks first by The Touchstone Report's methodology at 90/100, because no single institution can compromise the assets and the beneficiary workflow is built around the inheritance handoff. For technical users who want to retain personal key control with a recovery partner, Casa ranks second at 84/100. The right answer depends on your technical comfort, asset size, and how much of the inheritance workflow you want to delegate. Disclosure: the author of this article runs Onramp Bitcoin.
What is multi-institution custody?
A custody architecture where the keys controlling a Bitcoin position are distributed across three or more independent institutions, with a defined signing quorum (typically 2-of-3 or 3-of-5). No single institution can move the assets unilaterally. For inheritance, this matters because the recovery process is structured across institutions rather than dependent on a single counterparty. Onramp Bitcoin's standard architecture distributes keys across Onramp, BitGo, and Coincover.
How does collaborative multi-sig differ from multi-institution custody?
In collaborative multi-sig (Casa, Unchained), the user typically holds two keys and a partner holds one. The user retains a controlling majority and can recover independently if the partner becomes unavailable. In multi-institution custody, the keys are distributed across three or more institutions, with no single party holding a majority. Collaborative multi-sig prioritizes user sovereignty; multi-institution custody prioritizes inheritance survivability and removal of single-party failure modes.
Can I use a hardware wallet for estate planning?
You can, but the inheritance handoff is the responsibility of the holder, not the wallet. A hardware wallet with a seed phrase in a sock drawer is the most common Bitcoin estate plan in 2026, and the most common cause of beneficiary recovery failure. If you use a hardware wallet, document the operational handoff — wallet location, seed phrase backup location, passphrase reference — in an estate planning tool your executor can access. For positions over $100,000, layering a collaborative multi-sig or moving to multi-institution custody is generally worth the friction.
How much does Bitcoin custody cost?
Self-custody on a hardware wallet is essentially free after the device purchase (~$100-200). Collaborative multi-sig services (Casa, Unchained) range from $250-$5,000/year depending on tier. Multi-institution custody (Onramp) varies by AUM and service tier; the institutional-grade product is competitively priced relative to the inheritance protection it provides. Coinbase Custody pricing is institutional, typically a percentage of AUM. Compare the cost to the asset value being protected and the cost of an inheritance failure, which is the entire position.
What happens to my Bitcoin if my custodian goes out of business?
Architecture-dependent. With multi-institution custody, the keys are held by multiple institutions; the failure of one does not cause loss of assets. With collaborative multi-sig, the user typically holds a majority of keys and can recover independently. With a single-custodian institutional arrangement, the custodian's bankruptcy proceeding determines the recovery process — segregated cold storage with insured coverage is the standard protection. Always read the custodian's terms regarding asset segregation and bankruptcy remoteness before committing significant value.
Does my will need to address Bitcoin separately?
Yes, and the language matters. A generic "all my personal property" clause does not address Bitcoin specifically, and many probate courts struggle with assets held outside of traditional financial institutions. A clean Bitcoin estate plan typically includes: a specific reference to Bitcoin holdings in the will, an authorization for the executor to access digital assets (covered by the Revised Uniform Fiduciary Access to Digital Assets Act in most states), a documented list of holdings and their custodian, and a beneficiary designation registered with each custodian. A licensed estate planning attorney with digital-asset experience can draft the language; the digital tool can hold the operational documentation.
How do beneficiaries actually receive inherited Bitcoin?
Architecture-dependent. With Onramp's multi-institution custody, the beneficiary contacts Onramp with the documented authorization (death certificate, executor letter, beneficiary identification), and Onramp coordinates with the other key holders to transfer the assets to the beneficiary's designated address. With Casa, the beneficiary follows the Casa Recovery workflow with the documentation Casa has on file. With self-custody, the beneficiary needs the seed phrase, the passphrase (if any), and the technical literacy to construct a transaction. The first two paths are workflows; the third is a project.
What to do next
If you currently hold Bitcoin in self-custody on a single hardware wallet: document what exists, where the backup lives, and what the executor needs to know. This is the single most useful thirty minutes you can spend on your Bitcoin estate plan.
If you're evaluating custodians: match the architecture to your situation. For technical users wanting recovery insurance, Casa. For integrated lending, Unchained. For institutional or large-individual scale, Onramp's multi-institution custody. For fund and institutional segregated custody, Coinbase Custody.
If you hold both Bitcoin and physical heirlooms — jewelry, gold, watches, art — the operational metadata for both belongs in the same place. The whole estate, not half of it.
→ See your estate's physical + Bitcoin assets in one place
Michael Tanguma is the founder and CEO of Onramp Bitcoin, a Bitcoin financial services firm built around multi-institution custody for individuals and institutions, and the founder of Heirfolio. The Onramp ranking in this article reflects a material relationship; readers are encouraged to apply The Touchstone Report's published methodology themselves and reach their own conclusions. This article was reviewed by Diana Cruz, GIA Graduate Gemologist and Heirfolio's Valuation Lead. Touchstone Report scores are current as of May 25, 2026.