Self-Custody

Self-custody is the practice of holding and managing the private keys to your own cryptocurrency instead of leaving coins in the care of an exchange, broker, or other service. Because whoever controls the keys controls the funds, self-custody puts you, and only you, in charge of your assets.

It works through a non-custodial wallet, which generates a private key and a human-readable backup called a seed phrase, usually 12 or 24 words. Anyone who knows that phrase can restore the wallet and spend the funds, so it must be stored offline and never shared. Transactions are signed locally on your own device and broadcast to the network without any intermediary needing to approve them.

The alternative is custodial storage, where a service such as an exchange holds the keys on your behalf, much like a bank holds deposits. The saying "not your keys, not your coins" summarizes the trade-off: if the custodian is hacked, freezes withdrawals, or becomes insolvent, customers can lose access to their funds. The collapse of the FTX exchange in 2022 pushed many holders toward self-custody for exactly this reason.

Common tools include hardware wallets such as the Ledger Nano X, which keep keys on a dedicated offline device, and software wallets that run on a desktop or phone for everyday use.

Self-custody also transfers every responsibility to the user. There is no password reset, and no support desk can recover a lost seed phrase, while phishing attacks that trick people into revealing their keys remain common. It is the direct opposite of third-party custody, and long-term holders often combine it with cold storage to keep keys entirely offline.