Unchained multisig takes a different approach than most custody services: you hold the majority of keys, and Unchained acts as a collaborative partner rather than a custodian. In their 2-of-3 multisignature model, you control two keys on separate hardware wallets while Unchained holds one backup key. This means you can spend your bitcoin without Unchained’s permission, as long as you keep the vault’s wallet configuration file: Unchained is there to help with recovery and to offer financial services on top of your own custody, not to control your funds.
This article explains how Unchained’s collaborative custody model works, what financial services they build on it, and how it compares to both DIY multisig and fully managed solutions.
How Collaborative Custody Works
Unchained’s vault structure uses standard 2-of-3 Bitcoin multisig. The three keys are distributed as follows:
- Key 1 — Your primary hardware wallet: A hardware wallet you control completely, stored wherever you choose. It signs your withdrawals together with Key 2.
- Key 2 — Your second hardware wallet: Another hardware wallet, stored in a separate physical location — a safe deposit box, a trusted family member’s home, or another secure location. This geographic separation protects against theft, fire, or natural disaster at any single location.
- Key 3 — Unchained’s key: Held by Unchained as a backup. Your two keys sign your withdrawals on Unchained’s website; Unchained signs only if one of your keys is out of reach and you ask. You sign with your other key and record a short verification video, and Unchained signs once its signing team has reviewed it, which can take up to three business days. That is how it helps you recover if you lose one of your keys.
The critical distinction: because you hold two of the three keys, you keep control of your bitcoin. You can create and sign a transaction with your two hardware wallets without Unchained’s involvement, permission, or even knowledge, provided you have the vault’s wallet configuration file (its descriptor): two seeds alone can’t find the coins. Unchained keeps a copy of that file at all times, and its help centre recommends that most clients leave the file with Unchained rather than download and store their own: to recover, you or your heirs contact Unchained directly. A copy of your own is the option Unchained describes for advanced users, and it is what lets you spend if Unchained is down for a long time or gone. If you want one, download it from your vault while your account works and keep it as Unchained’s storage guide advises: offline, outside any cloud backup and in a different place from your keys. Unchained never has the power to move, freeze, or seize your funds — it holds only one key in a three-key quorum.
This is fundamentally different from traditional custodians, who hold all the keys. Casa’s managed vaults also leave you enough keys to reach the threshold (two of three on Standard, four of five on Premium; see our Casa review). With Unchained, if the company disappears tomorrow and you kept your own copy of the file, your bitcoin is unaffected: you sign with your two keys and the wallet configuration file in Unchained’s open-source Caravan or in another multisig-compatible wallet such as Sparrow, which imports Unchained’s file directly.
Financial Services Built on Multisig
What makes Unchained unique isn’t just the custody model — it’s the financial services layered on top of collaborative custody.
Bitcoin IRAs
Unchained offers US Individual Retirement Accounts (IRAs), Traditional or Roth, where your bitcoin is held in a multisig vault in which you hold two of the three keys; Fortis Bank serves as the IRA custodian. Your two keys can sign, but any coins that leave the vault, except in a prearranged rollover, are reported to the IRS as an IRA distribution, the tax term for a withdrawal. This gives tax-advantaged bitcoin savings with keys in your own hands rather than the fully custodial model most Bitcoin IRA providers use.
IRA pricing on Unchained’s pricing page, checked on 7 November 2026: no setup fee, $250 per IRA account per year, and a 1.5% fee on each trade, with a $2,000 minimum for each USD transfer, rollover or annual contribution.
Bitcoin-Backed Loans
Borrow US dollars against your bitcoin without selling it. Unchained lists these as US commercial loans to business entities, with a $150,000 minimum and a 12.0% interest rate when we checked on 7 November 2026 (its pricing page gives an example APR of 14.18% with a 2% origination fee). The collateral sits in a 2-of-3 multisig, but a loan vault splits its keys differently from a personal vault: you hold one key, Unchained one and Fortis Bank one. You can check the collateral on-chain at any time, but you can’t move it on your own.
Inheritance Protocol
Unchained’s Inheritance Protocol is a set of documents that guides your executor. After your death, the executor proves their authority to Unchained, and Unchained provides one of the two signatures needed. It can’t provide the other: your heirs must also have at least one of your keys, so your plan has to pass one on. Unchained keeps a copy of the wallet configuration file, and its help centre says your heirs would not necessarily need one, because Unchained can assist them with the transfer; it asks whoever recovers your account to contact it directly. A copy of your own matters for them only if they ever have to sign without Unchained. Guided inheritance setup is included in Unchained’s Signature plan ($6,000 the first year, then $4,500 a year) and offered on its own as Inheritance Boot Camp ($4,000 per client). For other approaches, see our multisig inheritance planning guide and the Bitcoin inheritance planning lesson.
Business Treasury
Companies can hold bitcoin treasury in collaborative custody with multi-user signing authority. Multiple authorized signers within the organization each hold a hardware wallet key, with Unchained providing the backup key and the platform for transaction coordination.
Vault Setup Process
- Create an Unchained account — An identity check is required for all services, and Unchained only opens accounts with a U.S. residential address.
- Prepare two hardware wallets from two different makers — Unchained’s help centre (checked 7 November 2026) fully supports current Trezor models (Safe 3, Safe 5, Safe 7) and Ledger models, and lists Coldcard, BitBox02 and Blockstream Jade as compatible. If you use a Coldcard, read our Coldcard advisory first. Each wallet generates a key that participates in the multisig.
- Configure the vault — On Unchained’s website, using a computer (its mobile app doesn’t work with hardware wallets), connect both hardware wallets; Unchained adds its own key. The platform creates the 2-of-3 multisig configuration and keeps a copy of its wallet configuration file. If you want your own copy for spending without Unchained, download it now and store it offline, in a different place from your keys, as described above.
- Register, verify and fund — Register the vault on each hardware wallet that isn’t a Trezor, with “Register devices” in Vault tools. Unchained says a Ledger, Coldcard, BitBox or Jade can’t sign until it is registered, and a Ledger or Coldcard can’t verify addresses either. For a Coldcard, first ask Unchained’s Client Services to turn on its configuration file, which is off by default. Then verify the receiving address on both hardware wallet screens (critical security step) and send a small test deposit. Once confirmed, fund your vault with your desired amount.
- Store hardware wallets securely — Place your two hardware wallets in separate secure locations along with their seed phrase backups.
Pricing
| Service | Cost |
|---|---|
| Vault (personal or business) | $250 per vault per year |
| Bitcoin IRA | No setup fee; $250 per IRA account per year; 1.5% per trade |
| Signature plan, individual (includes up to 10 vaults and guided inheritance setup) | $6,000 the first year, then $4,500 a year |
| Signature plan, business (includes up to 10 vaults) | $7,500 a year, or $2,000 a quarter |
| Inheritance Boot Camp | $4,000 per client |
| Commercial loans (bitcoin-backed) | 12.0% interest, $150,000 minimum |
Prices from unchained.com/pricing, checked on 7 November 2026; they change, so check again before you sign up. There is no free vault: a standalone vault costs $250 a year, and the Signature plans include up to 10 vaults in their price.
Pros and Cons
Pros
- True self-sovereignty: you hold 2-of-3 keys and can spend without Unchained’s involvement
- Little company risk: if Unchained disappears, your two keys and the wallet configuration file are enough to move your coins
- Recovery without Unchained through its open-source Caravan or another standard coordinator
- Financial services (IRAs, loans, inheritance) built natively on multisig security
- Business treasury support with multi-user signing
- Standard multisig format: the wallet configuration file imports into other coordinators
- Strong educational content and onboarding support
Cons
- KYC required for all services — not suitable for privacy-focused users
- Unchained can see your whole balance and history (it holds your vault’s xpubs)
- US-only: Unchained only serves accounts with a U.S. residential address
- Hardware wallets work only from a computer browser; the mobile app can’t use them
- No free vault: a standalone vault costs $250 a year
- You must manage two hardware wallets and their seed phrase backups
Unchained vs Casa vs DIY
| Factor | Unchained | Casa | DIY (Sparrow) |
|---|---|---|---|
| Keys you hold | 2 of 3 | 2 of 3 (Standard) or 4 of 5 (Premium) | All |
| Company risk | Low: your two keys and the wallet configuration file can spend without it | Low if you’ve saved the descriptor and the Sovereign Recovery email (and, on Standard, kept your phone) | None |
| Financial services | IRAs, loans, inheritance, business treasury, buying and selling | Inheritance, business treasury, buying and selling in the app (through Zero Hash) | None |
| Technical skill needed | Medium | Low | High |
| Identity check | Required | Not stated for vault plans; extra verification for Private Client inheritance | None |
| Mobile app | Yes, but hardware wallets need a computer | Yes | No (desktop) |
| Cost | $250 per vault per year | $250, $2,100 or $7,500 a year | Free |
Unchained fits best if you live in the US and want multisig together with an IRA, loans or business services. Casa is better if simplicity is your priority and you’re willing to trade some sovereignty for convenience. DIY with Sparrow is for users who want zero third-party involvement and have the technical skill to manage it. For a complete analysis of all options, see our lesson on Multisig in Practice.
Who Should Use Unchained?
Unchained is the right choice for:
- US bitcoin holders who want multisig security without giving up key majority — self-custody with a professional safety net
- Anyone wanting a Bitcoin IRA with genuine multisig custody rather than trusting a custodian
- US businesses that may need bitcoin-backed loans without selling (commercial loans, $150,000 minimum)
- Businesses holding bitcoin treasury who need multi-user signing authority
- Families planning bitcoin inheritance with professional protocol support
Verdict
Unchained gives you two of the three keys and builds US financial services on top: IRAs, commercial loans, inheritance help and business accounts. You get help with setup and recovery, while your own keys and the wallet configuration file can still move your coins without the company. A standalone vault costs $250 a year; the Signature plans include up to 10.
The identity check, and accounts limited to US residents, mean Unchained isn’t for privacy-maximizers or for people outside the US. For US bitcoiners who want IRAs, loans, inheritance planning or business custody on a model where they hold two of the three keys, it is a strong fit.
Frequently Asked Questions
Can I access my bitcoin if Unchained goes offline?
Yes, if you kept your own copy of the vault’s wallet configuration file. You hold two of the three keys, enough to spend together with that file, and you can download it only while your account works. Unchained’s default is to keep the file for you: it recommends that most clients leave it with Unchained, and it helps you or your heirs recover. If you want to be able to spend without Unchained, download the file now and keep it offline, in a different place from your keys; then you can sign in Unchained’s open-source Caravan or in Sparrow, which imports the file directly. This is the fundamental advantage of collaborative custody over traditional custodial models.
Do I need two different hardware wallet brands?
Not required, but strongly recommended. Your two keys are enough signatures to spend without Unchained, so if both came from one maker, a single firmware flaw could expose both. That risk is real: in July 2026 a Coldcard firmware flaw made seeds generated on affected firmware far easier to guess. Use two makers, for example one Trezor and one Ledger, or one Trezor and one Coldcard running fixed firmware.
How does the Bitcoin IRA work from a tax perspective?
Unchained offers both Traditional and Roth IRAs. Traditional IRA contributions may be tax-deductible, with taxes paid on withdrawal. Roth IRA contributions are made with after-tax dollars, but qualified withdrawals are tax-free. Consult a tax professional for your specific situation — Unchained provides the custody infrastructure, not tax advice.
Is Unchained available outside the US?
No. Unchained says it only services accounts with a U.S. residential address and doesn’t open international accounts (help centre, checked 7 November 2026). Outside the US, the multisig in practice lesson compares the other options, from a do-it-yourself multisig in Sparrow to managed services.
