Overview
Cold storage is the practice of keeping private keys offline to protect them from internet-connected attacks. It is the highest-assurance method of self-custody. Hardware wallets and paper backups are common forms.
How It Works
Cold storage isolates signing keys from any networked device, so remote attackers cannot reach them. Transactions are signed offline and broadcast separately. The seed phrase is stored physically and kept secure.
Why It Matters
Cold storage protects against the most common threat vector: remote theft. It is recommended for large or long-term holdings. Its trade-off is reduced convenience for frequent transactions.
Related Concepts
Cold Storage contrasts with Hot Wallets and relies on Hardware Wallets and Seed Phrases. It is a core Self-Custody practice.