Custodial vs non-custodial wallets

Who Controls the Keys?

A custodial wallet is one where a third party—typically an exchange like Coinbase, Binance, or Kraken—holds the private keys for you. You see a balance and can request transfers, but you do not actually have the keys. The provider does. If they get hacked, freeze your account, or go bankrupt, your access to funds depends entirely on them.

A non-custodial wallet—MetaMask, Phantom, Ledger, Trezor, and others—gives you direct control over the keys. The wallet software runs on your device, holds the keys locally (encrypted), and signs transactions itself. No one can freeze your funds, restrict your transactions, or lose them in a corporate failure. The phrase "not your keys, not your coins" captures the philosophy: custody equals ownership.

The tradeoffs run both ways. Custodial wallets are easier to use, offer customer support, and let you reset passwords if you forget them. Non-custodial wallets are harder—lose your seed phrase and the funds are gone forever, with no help desk to call. Most active users hold both: custodial for fiat on-ramps and active trading, non-custodial for self-sovereign storage of meaningful balances.