Cold Wallet

A cold wallet is a cryptocurrency wallet whose private keys are kept on a device or medium that is not connected to the internet. Because the keys never touch an online system, remote attackers cannot steal them with malware or phishing alone; they would need physical access plus any PIN or passphrase protecting the device.

Hardware wallets are the most common form of cold storage: a small device generates and stores keys internally, and transactions are signed inside the device while only the signed result is passed to an online computer. Paper backups of a seed phrase kept in a safe are another, more manual, form. For example, a long-term holder might keep most of their bitcoin on a hardware wallet in a home safe and only move coins to a hot wallet when they intend to spend.

A common misconception is that cold storage removes all risk; it removes online attack risk but adds physical risks such as fire, theft, loss, and simple forgetfulness, which is why a securely stored seed phrase backup matters as much as the device itself. Cold wallets trade convenience for security, so they suit savings rather than daily spending.