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An exchange helps you buy and sell crypto; a custodian safeguards crypto assets and administers access to the private keys used to move them. One company can do both. The key question is not what a provider calls itself, but who controls the keys, what the contract permits, and what happens if the provider fails.
What an exchange does—and what a custodian does
Crypto assets are recorded on a blockchain. A wallet is software or a device that manages the private keys or passcodes used to access and transact with those assets; it does not contain the assets themselves. Losing the keys can mean losing access. The SEC’s Crypto Asset Custody Basics for Retail Investors explains these distinctions.
An exchange or trading platform facilitates buying and selling, order handling, or related trading services. A custodian safeguards assets and manages access to their keys. These are different functions, not necessarily different firms. A trading platform may also hold customers’ assets, while a custodian may be independent of or affiliated with the platform. SEC Chair Gary Gensler noted in 2023 that crypto platforms can combine functions such as exchange, broker, dealer, clearing, and custody; his remarks are not a finding that every platform has the same structure or legal status (SEC remarks, June 8, 2023).
If you leave crypto on a platform, find out whether the platform or another provider controls the keys. Self-custody means you control the keys and are responsible for securing and recovering them. Third-party custody delegates key management to a provider, adding reliance on its operational controls, legal terms, business continuity, and solvency.
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How the roles compare
| Question | Exchange or trading platform | Custody arrangement |
|---|---|---|
| Main job | Facilitates trades, order handling, or other trading services. | Safeguards assets and administers access to the keys. |
| Who controls key access? | Depends on the platform’s arrangement. Trading may require transferring assets into a platform-controlled wallet. | A third-party provider controls or administers access; with self-custody, the owner controls the keys. |
| Is it independent? | May combine trading with brokerage, dealing, clearing, or custody. | May be independent of or affiliated with a trading platform; verify who actually holds or administers the keys. |
| What should you investigate? | Trading controls, conflicts, asset handling, and whether withdrawals are available under the terms. | Key access, authorization controls, storage, segregation, backup and recovery, and subcontractors. |
| Where do the main legal questions arise? | Registration and rules depend on the assets, activities, provider, and jurisdiction. | Ownership, permitted use, lending or rehypothecation, insurance terms, and insolvency treatment. |
The table describes questions to investigate, not a ranking of safety. A label such as “exchange” or “custodian” does not establish that a provider is independent, regulated for every activity, or offering a particular legal protection.
Hot and cold wallets describe connectivity, not who has custody
A hot wallet is connected to the internet; a cold wallet is typically offline. Either type may be used in self-custody or by a third-party custodian. Cold storage can reduce exposure to cyberthreats compared with an internet-connected wallet, but a physical device can still be lost, damaged, or stolen. The SEC’s retail bulletin discusses the trade-offs of hot and cold storage (SEC Investor.gov).
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A hardware wallet is one option for someone choosing self-custody, not a requirement or a guarantee against loss. Before choosing one, check that it supports the assets you hold and learn how its recovery process and seed-phrase backup work. Never share private keys or seed phrases.
Risks to weigh before choosing an arrangement
Control and access
A private key authorizes transactions. Ask who can initiate a transfer, whether approvals require multiple people or devices, how keys are stored, and how access can be restored. With self-custody, losing the keys or recovery information can leave you unable to access assets. With third-party custody, access depends on the provider’s systems, rules, and continued operation.
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Provider failure and insolvency
A third-party provider could be hacked, shut down, or become insolvent, disrupting access or recovery. Whether customer assets can be recovered depends on the arrangement, applicable law, and facts of a failure. SEC Staff Accounting Bulletin No. 121 discusses technological, legal, regulatory, and bankruptcy uncertainties in safeguarding crypto assets for platform users (SEC Staff Accounting Bulletin No. 121). It does not establish a universal outcome for customer assets in bankruptcy.
Segregation and use of customer assets
Check whether the provider keeps customer assets separate from its own and from other customers’ assets, and whether it may lend them, use them as collateral, or otherwise use them. Read the contract for any required consent and the provider’s stated practices. In a 2023 enforcement action, the SEC alleged that Kraken commingled customer and corporate funds; that is an allegation in the action, not a general finding about exchanges or custodians (SEC, “SEC Charges Kraken…”).
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Insurance and other protections
Ask what an insurance policy covers, who benefits, what exclusions and limits apply, and whether coverage is shared among customers. Insurance does not guarantee full reimbursement. SEC staff guidance for crypto exchange-traded products identifies custody policies and insurance as matters for disclosure (SEC, “Crypto Asset Exchange-Traded Products,” July 1, 2025).
Do not assume crypto custody is equivalent to a bank deposit or that securities protections cover every crypto asset. SEC Division of Trading and Markets staff says non-security crypto assets are not protected by SIPA and may lack another specific insolvency regime; that statement concerns those assets and does not settle the treatment of every asset or arrangement (SEC Division of Trading and Markets crypto activities FAQ). Rules and protections depend on the asset, service, provider, and jurisdiction.
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Platform conflicts and trading controls
When one business combines trading, brokerage, dealing, clearing, and custody, consider how it manages conflicts and discloses its activities. SEC guidance lists examples of risks that may be disclosed for crypto trading platforms, including fraud, manipulation, front-running, wash trading, security failures, and operational problems. These are examples of risks, not a claim that every platform engages in them (SEC, “Crypto Asset Exchange-Traded Products,” July 1, 2025).
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Questions to ask before using a provider
- Who controls the private keys, and who can authorize withdrawals?
- Where and how are assets stored, and what safeguards govern access?
- Are customer assets segregated from company assets and from other customers’ assets?
- Can the provider lend, pledge, or otherwise use customer assets? Is consent required?
- What happens to access and customer assets if the provider fails or enters bankruptcy?
- What does any insurance cover, who is covered, and what exclusions or limits apply?
- Which regulator oversees the specific service, and which protections apply to this asset and arrangement?
Get answers from the provider’s contract and disclosures, not just marketing language. SEC Investor.gov’s retail bulletin recommends asking about custody arrangements, commingling, lending, and what happens if a provider fails (SEC Investor.gov).
Regulatory scope matters
The cited regulatory materials are U.S.-focused. SEC investor bulletins and staff statements explain investor risks and staff views; they do not make every crypto asset or provider subject to the same securities laws. The SEC’s December 2025 retail bulletin says it is not a rule, regulation, or Commission statement and has no legal force or effect. Federal and state rules may differ, and non-U.S. rules can differ as well. Check the status of the particular provider, asset, and service rather than inferring protections from a general label.
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