What Is a Bitcoin-Backed Loan?
A Bitcoin-backed loan is a collateralized loan: the borrower posts bitcoin as security, the lender advances cash (or a stablecoin), and when the loan is repaid the collateral comes back. The structure is the same one banks have long used in securities-based lending and margin accounts. Bitcoin suits it unusually well because the collateral is liquid around the clock, divisible to eight decimal places, and verifiable on a public blockchain rather than in a custodian's private ledger.
Businesses and individuals use these loans for the same reason: access to cash without a sale. A company holding bitcoin in its treasury can fund operations or expansion while keeping its position, and a long-term holder can cover a large expense without giving up the asset or triggering a disposition. The trade is that borrowing against a volatile asset introduces its own risks, and those risks live in the loan's mechanics.
How Loan-to-Value Ratios Work
The loan-to-value ratio (LTV) is the loan amount divided by the current market value of the collateral. Borrow $50,000 against $100,000 of bitcoin and the LTV is 50 percent. Because the denominator moves with the bitcoin price, the LTV is a live number that changes continuously over the life of the loan.
Lenders set initial LTVs well below 100 percent, often in the 20 to 50 percent range, so the loan stays overcollateralized through ordinary volatility. A lower starting LTV requires more collateral per dollar borrowed but gives the position more room before any intervention. Each loan agreement defines at least three numbers a borrower needs to know:
- The initial LTV, which determines how much collateral the loan requires at origination.
- The margin call threshold, the LTV at which the lender demands action.
- The liquidation threshold, the LTV at which the lender sells collateral.
Margin Calls and Liquidation
When the bitcoin price falls far enough to push the LTV past the margin call threshold, the lender notifies the borrower and requires one of two responses within a defined notice period: post additional collateral, which lowers the LTV by raising the denominator, or repay part of the loan, which lowers it by shrinking the numerator.
If the borrower does not respond in time, or if the price keeps falling and reaches the liquidation threshold, the lender sells enough collateral to bring the loan back into compliance or to close it entirely. Three details determine how painful a liquidation is in practice:
- Notice and timing. Some agreements give the borrower 24 to 72 hours to respond to a margin call; others authorize automatic liquidation the moment a threshold is touched. During a sharp move, that difference decides whether the borrower gets a chance to act at all.
- How much is sold. Partial liquidation sells only enough to restore the target LTV. Full liquidation closes the loan and returns whatever remains. The agreement specifies which applies.
- Tax consequences. A liquidation is a sale of the borrower's bitcoin, which can create a taxable gain or loss on top of the loss of the position. The borrower carries this even though the lender executed the sale.
Borrowers can manage margin risk by starting at a conservative LTV, holding a reserve of unencumbered bitcoin ready to post, and setting price alerts well above the contractual thresholds rather than waiting for the lender's notice.
Rehypothecation: What the Lender Does With the Collateral
The most important thing to establish with any lender is rehypothecation, the lender's reuse of the borrower's collateral for its own purposes: lending it to trading firms, posting it as collateral for the lender's own borrowing, or deploying it into yield strategies. The practice lets a lender earn additional return on assets it is holding anyway, and lenders that rehypothecate can often advertise better terms because the collateral is working for them.
The risk lands entirely on the borrower. Rehypothecated collateral is not sitting in reserve; it is a claim on counterparties who are expected to give it back. If those counterparties fail, or if the lender itself becomes insolvent while the collateral is deployed, the borrower's bitcoin may simply not be there to return. In a bankruptcy, the borrower can be reclassified as an unsecured creditor of the bankruptcy estate, standing in line behind secured parties for whatever fraction eventually gets distributed. Loan terms decide this outcome: agreements that grant the lender broad rights to use customer assets effectively convert "your collateral" into "the lender's balance sheet" the moment things go wrong.
What the 2022 Lender Failures Showed
In 2022, falling prices and interconnected counterparty failures pushed several large lending platforms into bankruptcy, and customers learned how much the custody and reuse terms mattered.
Celsius Network filed for Chapter 11 bankruptcy protection in July 2022; its court docket is maintained by the claims agent Stretto. The U.S. Securities and Exchange Commission subsequently charged Celsius and its founder with fraud and the unregistered offer and sale of securities. BlockFi filed for Chapter 11 in November 2022 (case 22-19361, District of New Jersey); its docket is maintained by Kroll. In both proceedings, customers with assets on the platforms became creditors in a court process that took years to distribute recoveries, rather than holders who could simply withdraw their bitcoin.
The structural lesson applies to any lender evaluation today: when customer assets are pooled with the platform's own and deployed for yield, the customer's only recourse in a failure is a bankruptcy claim. The protections that would have changed those outcomes (segregated collateral, no reuse rights, third-party or multisig custody, clear ownership terms) are exactly the items on the checklist at the end of this article.
How Collateral Custody Works
Between origination and repayment, the collateral has to sit somewhere. The custody model determines what the borrower can verify and what survives a lender failure.
Omnibus Custody
In an omnibus model, the lender pools all customer collateral in shared wallets it controls. The borrower's claim exists in the lender's internal ledger, not on-chain. The omnibus model is operationally cheap for the lender, but the borrower cannot independently verify their specific collateral, and pooled assets are the easiest to rehypothecate and the hardest to separate from the estate in a bankruptcy.
Segregated Custody
In a segregated model, each borrower's collateral sits at its own dedicated addresses, either with the lender or with an independent custodian. The borrower can watch the collateral on-chain for the life of the loan, and any movement is publicly visible. Segregation makes reuse detectable and supports verification practices like proof of reserves. Where an independent qualified custodian holds the collateral, the lender's insolvency and the collateral's location are at least structurally separated.
Multisig Escrow With Borrower Keys
The strongest category puts the collateral in a multisig escrow, commonly 2-of-3: one signature for the borrower, one for the lender, and one for a neutral escrow agent. No single party can move the funds. The borrower holds one of the cryptographic seats, so the collateral cannot be rehypothecated, lent out, or moved at all without a second signature, and the borrower can verify all of this on-chain at any time. Bitcoin's script capabilities, including timelocks and vault-style constructions, make these arrangements native to the asset rather than bolted on. The general principles behind these arrangements are covered in How Does Bitcoin Custody Work?
The custody model is also where business borrowers should apply the most diligence, since corporate treasuries answer to boards and auditors for collateral arrangements. The broader institutional context is covered in How Do Businesses and Institutions Take Custody of Bitcoin?
The Tax Angle: Borrowing Instead of Selling
The tax logic behind these loans is simple in outline. In many jurisdictions, including the United States, where the IRS treats digital assets as property, selling bitcoin is a disposition that can realize a capital gain, while borrowing against it generally is not. A holder with a large unrealized gain can access liquidity through a loan without crystallizing that gain.
Two caveats keep this from being a free lunch. A forced liquidation of collateral is a sale, with the same tax consequences the borrower was deferring, executed at the worst possible moment by definition. And jurisdictions differ on the treatment of loans, collateral transfers, and lender custody arrangements, so the structure of the specific agreement matters. None of this is tax advice; a borrower should review the actual loan terms with a qualified tax professional before signing.
Questions to Ask Any Lender
No lender is named in this article by design: providers, terms, and rates change quickly, and the evaluation framework outlasts any list. A borrower who gets clear written answers to the following has covered the failure modes that have actually hurt people:
- Does the lender rehypothecate collateral or use it in any way while the loan is outstanding? Is that stated in the agreement, not just in marketing?
- Where does the collateral sit: omnibus pool, segregated addresses, or multisig escrow? Can the borrower verify it on-chain throughout the loan?
- Who holds the keys, and does the borrower hold one of them? Is there an independent custodian or escrow agent?
- What are the exact margin call and liquidation thresholds, the notice period, and the liquidation method (partial or full)?
- What do the terms say about ownership of the collateral if the lender becomes insolvent?
- Is the lender regulated, audited, or publishing proof of reserves? In which jurisdiction would a dispute be resolved?
- How is interest structured (fixed or variable), what fees apply at origination and repayment, and can the loan be repaid early without penalty?
A lender that answers these directly and in writing is offering a product that can be evaluated; one that will not has answered the rehypothecation question by omission.
Frequently Asked Questions
What is rehypothecation?
Rehypothecation is a lender's reuse of a borrower's collateral for the lender's own purposes, such as lending it to other parties or posting it as collateral elsewhere. If the lender fails while the collateral is deployed, the borrower may be left as an unsecured creditor rather than getting the bitcoin back.
What happens if the bitcoin price drops during a loan?
A falling collateral price raises the loan-to-value ratio. Past a threshold set in the loan agreement, the lender issues a margin call requiring more collateral or partial repayment. If the borrower does not act within the notice period, or if the price reaches the liquidation threshold, the lender sells collateral to cover the loan.
Is borrowing against bitcoin a taxable event?
In many jurisdictions, including the United States, borrowing is generally not a disposition of the asset, while selling is. A forced liquidation of collateral, however, can count as a sale and create a taxable gain or loss. Tax treatment varies by jurisdiction, so borrowers should consult a qualified tax professional.
What happens to collateral if the lender goes bankrupt?
The outcome depends on how the collateral was held and what the loan terms say. Collateral that was pooled or rehypothecated may become part of the bankruptcy estate, leaving the borrower an unsecured creditor. Collateral held in segregated or multisig escrow arrangements with clear borrower ownership terms is better insulated, though outcomes are decided by courts.
What loan-to-value ratio is typical for a Bitcoin-backed loan?
Lenders commonly set initial loan-to-value ratios well below 100 percent, often in the 20 to 50 percent range, to leave a buffer against price swings. A lower starting LTV means more collateral per dollar borrowed but a smaller chance of margin calls. Each agreement also defines a margin call threshold and a liquidation threshold above the starting LTV.