Crypto glossary

Self-Custody

Self-custody means controlling your own private keys, for example by holding coins in a personal wallet, instead of letting a bank, exchange or other central party hold them for you.

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Custody, explained

Custody is about who holds the keys. When you buy crypto on a centralized exchange and leave it there, the exchange controls the keys; your account shows a balance, which is a claim against the company. With self-custody, you hold the keys in a non-custodial wallet, such as a hardware wallet or a wallet app where only you know the seed phrase.

The saying not your keys, not your coins sums up the difference.

Why people choose it

Self-custody removes counterparty risk: the risk that the company holding your assets fails, is hacked or freezes withdrawals. That risk is real. The Mt. Gox exchange collapsed in 2014 after losing a large amount of customers' bitcoin, and in November 2022 the exchange FTX halted withdrawals and filed for bankruptcy, leaving customers unable to access their funds for a long time. Lenders such as Celsius also froze withdrawals that year.

Self-custody also lets you use decentralized applications directly and send funds without asking permission.

The responsibility you take on

With self-custody, there is no password reset and no support line. If you lose your seed phrase and your device, the funds are gone. If someone tricks you into revealing it or signing a malicious transaction, they can drain your wallet and nobody can reverse it. Mistakes such as sending to a wrong address or wrong network are also permanent.

Practical safeguards

Common practices include writing the seed phrase on paper or metal and storing it offline in a safe place, never photographing it or typing it into a website, using a hardware wallet for larger amounts, sending a small test transaction first, and thinking about inheritance so family members can access funds if needed. More advanced setups use multi-signature wallets that require several keys.

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Frequently asked questions

Is self-custody safer than an exchange?

It removes the risk of the exchange failing but adds the risk of your own mistakes and theft. Which is safer depends on how carefully you manage your keys.

Do I need a hardware wallet for self-custody?

No, a software wallet is also self-custody. A hardware wallet adds protection by keeping keys away from internet-connected devices.

What happens to self-custodied crypto when I die?

Without a plan, heirs may not be able to access it. Many people document recovery steps securely or use multi-signature or inheritance services.

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All glossary terms · Educational reference only — not investment, legal, tax or financial advice.