8 min readWhat Is Rehypothecation, and Why It Matters for Your Crypto Collateral
Rehypothecation is a word most borrowers meet for the first time after it has already cost someone money. It means a lender taking the collateral you pledged and using it for its own business: lending it to a trading firm, posting it against its own borrowing, or putting it into a yield strategy. You still owe the loan. Your collateral is now somewhere else, and its return depends on someone you have never heard of.
Rehypothecation is a word most borrowers meet for the first time after it has already cost someone money. It means a lender taking the collateral you pledged and using it for its own business: lending it to a trading firm, posting it against its own borrowing, or putting it into a yield strategy. You still owe the loan. Your collateral is now somewhere else, and its return depends on someone you have never heard of.
This article explains the mechanism, what it did in 2022, how to find it in an agreement, and what a lender that does not do it should be able to show you.
The mechanism
A crypto-backed loan has two legs. You transfer collateral to the lender; the lender transfers cash to you. The agreement decides what the lender may do with the collateral between those two moments and repayment.
In the simplest arrangement, the collateral sits in a wallet and does nothing. The lender earns interest on the cash it lent and nothing on the collateral. That is the model Arvexo describes on its security page: held with Ledger and Cobo Custody, segregated, not lent out.
In a rehypothecation arrangement, the lender treats the collateral as its own inventory. It can lend the Bitcoin to a market maker for a fee, deposit it with an exchange to earn yield, or pledge it as collateral for a loan to itself. The lender's return on your loan goes up. The risk that the collateral is not there when you repay goes up with it.
The term comes from securities finance, where a prime broker reuses a client's margin securities. There, the practice is limited by rule: in the United States, a broker may rehypothecate client securities only up to 140% of the client's debit balance, and only with consent. [1] Crypto lending has no equivalent limit. Whatever the agreement allows is allowed.
What it did in 2022
The 2022 failures were, at their core, chains of reuse.
The Financial Stability Board's February 2023 review of decentralised finance describes how leverage, interconnection and the reuse of collateral across crypto intermediaries turned the collapse of one firm into a sequence of failures, with assets "forcibly liquidated into a market with low liquidity". [2] The centralised lenders that failed had, in different ways, deployed customer assets into counterparties that then could not return them.
The Celsius case made the consequence concrete. In January 2023 the bankruptcy court found that assets customers had placed in Earn accounts had become Celsius's property under the terms of use, and so were part of the bankruptcy estate. [3] Customers who believed they had deposits found they had unsecured claims. The product was not a collateralised loan, and the ruling was about one contract; but the mechanism is the same one rehypothecation creates: once the firm can treat your asset as its own, in insolvency it is its own.
Rehypothecation versus title transfer
Two different clauses produce similar outcomes, and both need checking.
Use clause. The borrower keeps ownership, but the lender has a contractual right to use, lend, pledge or "deal with" the collateral during the loan. If the lender's counterparty fails, the lender owes you the collateral back and may not have it.
Title transfer. Ownership of the collateral passes to the lender at drawdown, with an obligation to return equivalent assets on repayment. You hold a claim, not an asset. In insolvency you are a creditor.
A lender that says "we do not rehypothecate" may still take title. A lender that leaves title with you may still have a use clause. Ask about both.
There is a tax dimension too. HMRC's guidance for DeFi arrangements treats a platform being free to deal with collateral as a strong indicator that beneficial ownership has transferred, which can make posting the collateral a disposal for capital gains purposes. [4] The tax article covers this; the point here is that a use clause can change your tax position as well as your risk.
How to find it in an agreement
The clause is rarely headed "Rehypothecation". Search the agreement for these words and read every sentence that contains them:
- use, utilise, deploy
- lend, loan (as applied to the collateral)
- pledge, hypothecate, re-hypothecate
- transfer of title, absolute title, beneficial ownership
- deal with, dispose of, in its discretion
- equivalent assets, fungible, return of assets of the same type
The last line is the one borrowers miss. An obligation to return "equivalent" assets rather than "the" assets is a tell that the lender does not expect to hold your specific coins.
If the agreement is silent, that is not a yes. Ask for a written statement, and ask that it be added to the agreement.
What a no-reuse lender can show you
A lender that does not reuse collateral should be able to answer all of these without hesitation.
- Where does my collateral sit? A named custodian, in a segregated wallet created for your loan.
- Can I see the wallet? Yes, an on-chain address you can watch, which holds only your collateral.
- Does the agreement prohibit reuse? Yes, and here is the clause.
- Does title pass to you? No; you grant a security interest, ownership stays with you.
- What happens if you fail? Collateral is held apart from the lender's estate; the custody terms recognise the customer.
- Who can move the collateral? A described signing process, with the custodian's approval required.
Arvexo publishes its custody arrangement on the security page and in How is my collateral stored and protected?. Read the agreement's wording against those pages before relying on either.
Why a lender would reuse collateral at all
Because it is profitable, and because it lets the lender offer a lower rate. A lender earning 3% on your Bitcoin by lending it out can charge you less for your loan and still make more. The borrower who shops on rate alone is, without knowing it, choosing the lender with the strongest incentive to reuse.
That is the trade. A no-reuse lender is funding your loan from its own capital and pricing the loan to cover it. The lender comparison checklist puts the reuse question second, before the rate, for that reason.
Frequently asked questions
Is rehypothecation illegal?
No. In securities markets it is regulated and limited. In crypto lending it is governed only by the agreement and by whatever licensing regime applies to the lender, which in most jurisdictions is none for the lending activity itself.
Can I tell from the blockchain whether my collateral has been reused?
If you have a segregated wallet address, yes: if the balance moves, the collateral has moved. In a pooled wallet you cannot tell; the balance reflects everyone's collateral and the lender's activity together.
Does "insured custody" protect me from reuse?
No. Custody insurance typically covers theft of keys from the custodian's infrastructure. It does not cover a lender's contractual right to use the assets, or a counterparty failing to return them.
What about proof of reserves?
A reserves attestation shows the firm held at least what it owed at a point in time. It does not show whether your collateral is segregated or whether the firm has reuse rights. Treat it as one signal.
If my lender reuses collateral and fails, what do I get back?
It depends on the agreement, the jurisdiction and the insolvency process. If title passed or the collateral was reused, you are most likely an unsecured creditor. The Celsius timeline, measured in years, is the cautionary example.
Before you pledge
Read the use and title clauses, not the security page. Ask for the segregated address and watch it once the loan is funded. If any of the six questions above gets a vague answer, the rate does not matter. The custody guide covers the rest of the custody model; the calculator gives an indicative quote for a loan on Arvexo's terms.
Related reading
- How crypto collateral custody works: questions to ask your lender
- How to compare crypto lenders: a borrower's checklist
- How is my collateral stored and protected?
- Security at Arvexo
Collateral can fall in value and be sold. This article is for general informational purposes only and does not constitute financial, investment, legal, or tax advice.
Sources
- US SEC, Rule 15c3-3 (customer protection) and FINRA Rule 4330 (customer securities loans).
- Financial Stability Board, The Financial Stability Risks of Decentralised Finance, 16 February 2023, pp. 20–21.
- US Bankruptcy Court, SDNY, In re Celsius Network LLC, memorandum opinion of 4 January 2023, pp. 4–5 and 45.
- HMRC, Cryptoassets Manual, DeFi lending and staking: beneficial ownership of collateral.
