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An exchange helps you buy and sell crypto; a custodian safeguards crypto assets and manages access to the private keys used to authorize transactions. One company can do both. The key distinction is the service being performed—and, for the customer, who controls access, what the provider may do with assets, and what happens if the arrangement fails.
Exchange and custodian: the difference
An exchange or trading platform primarily provides a place or service for buying and selling crypto, including handling orders. A custodian arrangement concerns how assets are safeguarded and who controls or administers the keys that authorize transactions. These are different functions, not necessarily different companies.
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A crypto asset is recorded on a blockchain. A wallet is software or a device that manages the private keys or other credentials used to access and transact with the asset; it is not a container holding the asset itself. Losing the key or recovery information can mean permanently losing access. The SEC’s Crypto Asset Custody Basics for Retail Investors explains these distinctions.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitches| Question | Exchange or trading platform | Custody arrangement |
|---|---|---|
| Primary role | Facilitates buying and selling, order handling, or related trading services. | Safeguards assets and administers access to the private keys. |
| Who controls key access? | Depends on the platform. You may need to transfer assets to a platform-controlled wallet to trade. | A third-party custodian controls or administers access; in self-custody, you control the keys. |
| Must it be independent? | No. A trading business may also provide custody or other functions. | No. A custodian may be independent of, or affiliated with, a trading platform. |
| Key questions | Trading operations, conflicts, asset handling, and withdrawal availability. | Key controls, wallet arrangements, segregation, permitted asset use, recovery, and insolvency terms. |
Do not assume an exchange account means an independent firm holds your assets. SEC Chair Gary Gensler’s June 2023 remarks described platforms combining functions such as exchange, broker, dealer, clearing, and custody. Which rules apply depends on the activity, asset, provider, and jurisdiction.
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- Effortlessly build your crypto portfolio via the all in one Ledger Wallet app: buy, sell, send, receive, swap, stake and more across popular blockchains. 15,000+ coins & tokens in a single dashboard. Keep a close eye on the market. Compare service providers. Track performance. Get timely alerts. Build your portfolio with confidence.
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Who controls the keys—and what that means
Self-custody
With self-custody, you control the keys and are responsible for protecting them, keeping recovery information secure, and making sure you can restore access. A hardware wallet is one option: it is a physical device that manages keys, not a guarantee against loss, theft, or mistakes. Check that a device supports your assets and understand its backup and recovery process before relying on it. Never share private keys or seed phrases.
Third-party custody
With third-party custody, a provider controls or administers key access for you. This can shift day-to-day key management, but it makes access dependent on that provider’s controls, continuity, legal terms, and financial condition. Read the agreement to learn who can authorize withdrawals, what approvals are required, and how access can be restored.
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Hot and cold wallets
“Hot” and “cold” describe connectivity, not who provides custody. Either self-custody or third-party custody can use hot wallets, cold wallets, or both. A cold wallet is typically kept offline and may reduce exposure to cyberthreats compared with an internet-connected hot wallet; a physical device can still be lost, damaged, or stolen. The SEC’s custody bulletin discusses these trade-offs.
Risks to check before choosing an arrangement
Access and operational controls
Ask how keys are stored, who can initiate or approve transfers, whether approvals require multiple people or devices, and what happens if a key, device, or account becomes inaccessible. For a platform, also consider how its trading operations and withdrawal process work. No wallet label alone answers these questions.
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Provider failure and insolvency
A third-party provider may be hacked, shut down, or become insolvent, disrupting access or recovery. The SEC’s Staff Accounting Bulletin No. 121 discusses technological, legal, and regulatory uncertainties in safeguarding crypto assets, including questions about ownership and whether assets could be available to general creditors in bankruptcy. The result depends on the specific arrangement and applicable law; recovery is not assured or ruled out by the word “custodian.”
Segregation and use of customer assets
Find out whether your assets are kept separate from the provider’s assets and other customers’ assets, and whether the provider may lend them, use them as collateral, or otherwise reuse them. Check whether your consent is required and what the contract says about withdrawal rights. The SEC’s retail bulletin recommends asking about commingling and rehypothecation. In its November 2023 Kraken enforcement action, the SEC alleged commingling; that is an allegation, not an adjudicated conclusion established here.
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Insurance and legal protections
Ask what an insurance policy covers, who benefits, what exclusions and limits apply, and whether coverage is shared among customers. Insurance is not a promise of full reimbursement. The SEC’s July 2025 crypto ETP disclosure guidance identifies custody policies and insurance as matters relevant to disclosure; it also gives examples of risks to disclose, including fraud, manipulation, front-running, wash-trading, security failures, and operational problems on trading platforms. These are examples of risks, not a claim that every platform engages in them.
Do not assume crypto custody carries bank deposit insurance or that securities protections apply to every crypto asset. SEC Division of Trading and Markets staff guidance says non-security crypto assets are not protected by SIPA and may lack another specific insolvency regime. That qualification is about non-security assets and does not settle the treatment of every asset or arrangement. The same SEC materials are not a blanket determination that all crypto assets or providers are subject to identical securities laws.
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A practical due-diligence checklist
- Who actually controls the private keys, and who can authorize or approve withdrawals?
- Where and how are assets stored, and what security and recovery controls are used?
- Are customer assets segregated, commingled, or available for lending or use as collateral?
- What does the contract say about ownership, withdrawal rights, and what happens if the provider fails?
- What does insurance cover, who is covered, and what exclusions or shared limits apply?
- Which regulator oversees the provider, and which protections apply to this particular asset and service?
These questions matter whether custody is offered by the exchange itself or by a separate provider. The SEC materials cited here are U.S.-focused investor education and staff guidance; rules and protections can differ by service, provider, asset, and jurisdiction, and may change.
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