A cold wallet, or cold storage (cold storage), is a way of storing cryptocurrency so that the private keys are never in an environment constantly connected to the network. Since the keys remain offline, attackers cannot gain remote access to them via the internet, malware, or phishing sites. That is precisely why cold storage is considered a basic security measure for long-term savings.

How cold storage is implemented

• Hardware wallets — special devices that sign transactions inside a secure chip.
• Paper wallets — printed keys or seed phrases stored outside the digital environment.
• Isolated media — backup copies of keys on devices that are not connected to the network.

The opposite of a cold wallet is a hot wallet, which is constantly online and convenient for frequent operations but more vulnerable. A common strategy is to combine both approaches: keep the main part of one's assets in cold storage, and a small amount for everyday transfers in a hot one.

When using a cold wallet, it is critically important to securely save the backup phrase. Losing it means an irreversible loss of access to the funds, since decentralized networks have no password-recovery service.