Custodial Wallet

A custodial wallet is a cryptocurrency account where a third party, such as an exchange, holds the private keys on your behalf. You see a balance and can send or withdraw funds, but technically the company controls the coins and executes transactions for you, much like a bank holds deposits.

For example, when you buy ether on a major exchange and leave it there, the exchange keeps the keys in its own storage systems. You log in with a username, password, and two-factor authentication, and if you forget your password, the company can restore your access. That convenience is the main appeal: no seed phrases to protect, and account recovery exists.

The cost of that convenience is counterparty risk. If the custodian is hacked, becomes insolvent, or freezes withdrawals, your funds are affected even though you did nothing wrong; several exchange failures have made this risk concrete. A common misconception is that a balance shown in an app proves the coins are there; it only proves the company owes them to you. The phrase often used to summarize this is that if you do not hold the keys, the coins are ultimately a claim on someone else.