A crypto exchange lets you buy and sell crypto and may also hold it for you. A crypto wallet helps you access crypto accounts and authorize transactions. The key difference is custody: who controls the private keys and who is responsible for recovering access.
Use exchange custody when provider-managed access and trading convenience suit you, after checking the provider’s terms and practices. Consider self-custody when direct control matters and you can protect your keys and recovery phrase. Neither choice removes risk: exchange custody depends on a third party, while self-custody puts security and recovery in your hands.
What does a crypto exchange do?
A crypto exchange is a service or platform for buying and selling crypto assets. Some exchanges also provide custody, keeping control of the keys used to access assets on a customer’s behalf. An exchange account can therefore combine trading with wallet-like access, but that does not necessarily mean you control the private keys.
Features, withdrawal rules, fees, and legal treatment vary by provider and jurisdiction. Check the terms for the specific service you use rather than assuming every exchange works the same way.
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What does a crypto wallet do?
A wallet is a tool for managing the credentials that let you access crypto accounts and authorize transactions; crypto assets are not literally stored inside the app or device. A private key authorizes transactions, while a public key can be shared so others can send assets. A seed phrase may be used to restore a wallet if a key or device is lost or damaged. The SEC staff investor bulletin on crypto asset custody explains these functions and risks.
Wallet software and custody are different questions. A wallet may be self-custodial, with the user controlling the private keys, or a service may manage access for the user. To understand who has control, check how the wallet or account handles keys and recovery.
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Exchange custody vs. self-custody
| Decision | Exchange custody | Self-custody wallet |
|---|---|---|
| Who controls access? | A third-party service controls access to the private keys. | You control the private keys. |
| How is access recovered? | Account recovery may be available through the provider; check its actual process. | Recovery depends on keeping the key or seed phrase safe. Losing it may mean permanent loss of access. |
| What is the main dependency? | The provider’s security, solvency, custody practices, and withdrawal terms. | Your ability to secure the keys and preserve recovery credentials. |
| What do you need? | An exchange account; no physical device is necessarily required. | Wallet software, or optionally a physical cold-wallet device. |
| What costs or limits should you check? | Trading, transfer, or account charges and supported assets; specifics vary by provider. | Device cost if applicable, network or transaction fees, supported assets, and the recovery process. |
These are general comparison points, not a recommendation to use a particular provider or hold a particular asset. Ethereum.org’s wallet guidance describes wallet and custody concepts in an Ethereum context; its network-specific details should not automatically be applied to every crypto asset.
When should you use an exchange account?
Exchange custody may suit you if you value provider-managed access and want to trade through the service. That convenience comes with dependence on the provider: access may be affected if the provider is hacked, shuts down, becomes insolvent, or restricts withdrawals under its terms.
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Before relying on a custodian, review its security safeguards, fees, withdrawal rules, recovery process, privacy practices, and what it says happens if the provider fails. The SEC staff bulletin also advises checking insurance terms and whether assets may be lent or commingled. Do not assume crypto held through an exchange has the same protections as a bank deposit.
When should you use a self-custody wallet?
Self-custody may suit you when direct control of private keys matters and you are prepared to manage security and recovery yourself. It removes dependence on a custodian for key access, but it does not remove the risk of loss or theft. If a key or seed phrase is lost, access may be permanently lost; if someone else obtains it, they may be able to compromise the assets.
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- Keep the seed phrase private and secure; never share it.
- Make a recovery plan for loss or damage to a device. Customer support generally cannot restore a self-custody wallet without the recovery credentials.
- Check that the wallet supports the assets and networks you intend to use before relying on it.
- Remember that transactions on Ethereum cannot be reversed, and self-custody users are responsible for their keys, as Ethereum.org explains.
Hot vs. cold wallets: a separate choice
Hot and cold describe a wallet’s connection to the internet, not who controls the keys. Hot wallets connect to the internet and can be convenient for transactions, but are exposed to cyberthreats. Cold wallets are typically physical devices kept offline and are generally less exposed to cyberthreats, but they can be lost, damaged, or stolen. Either kind may be used with self-custody or third-party custody, depending on the arrangement.
A hardware crypto wallet is an optional physical cold-wallet device, not a guarantee against loss. If considering one, check supported assets and networks and plan how you will protect recovery credentials as well as the device. Offline storage may reduce exposure to online threats, but it cannot prevent physical loss or remove recovery responsibilities.
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What legal protections apply?
Legal status and protections depend on the asset, service, and jurisdiction. The SEC’s Investor.gov alert on crypto asset securities addresses risks involving securities and platforms that combine functions or lack applicable registration. It should not be read as establishing the same legal status or protections for every crypto exchange, asset, or country. The SEC custody bulletin describes staff views and is not a rule, regulation, or Commission statement.
Quick Recap
A practical way to decide
- Identify the custody arrangement. Ask who controls the private keys for the account or wallet, rather than relying on the product label.
- Compare recovery options. For a provider, read its account-recovery process. For self-custody, decide how you will keep the key or seed phrase secure and accessible if a device fails.
- Check the terms and fit. Review supported assets, fees, withdrawal rules, security safeguards, privacy practices, and what happens if a provider fails.
- Choose based on the responsibility you can manage. Provider custody makes you dependent on the service; self-custody makes you responsible for keys and recovery.
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