Custodial vs. non-custodial wallets

The often-repeated phrase "not your keys, not your coins" points to a real distinction between two fundamentally different ways of holding crypto.

Custodial wallets: someone else holds the keys

When you keep crypto on an exchange, the exchange controls the private keys, not you. This is convenient — password resets, customer support, easier trading — but it means your holdings depend entirely on that company's solvency and security practices.

Non-custodial wallets: you hold the keys

A non-custodial wallet gives you direct control of your private keys, typically represented as a seed phrase. No company can freeze or lose your funds on your behalf — but there's also no password reset if you lose that seed phrase.

The real tradeoff

Custodial wallets shift counterparty risk onto a company; non-custodial wallets shift responsibility entirely onto you. Several major exchange collapses have shown custodial risk is real, but non-custodial mistakes (lost seed phrases, phishing attacks) are just as final.

A common middle path

Many holders use an exchange for active trading and move longer-term holdings to a non-custodial wallet — often a hardware wallet for larger amounts — treating each tool for what it's actually good at.