Glossary · Custody & Security
Cold Storage
Also: cold wallet, offline storage
Published
Cold Storage — Cold storage is the custody of digital assets with private keys or key shares that are never exposed to an internet-connected system, so that signing requires a deliberate, controlled process to bring the key material into use. It protects against remote compromise at the cost of slower access.
What Cold Means
The defining property is isolation. Key material lives on devices with no network connection, in secured facilities, often as shares under a multi-party computation or multisignature scheme so that no single device or person can sign alone. Moving funds requires a documented procedure: assembling authorized participants, constructing the transaction on an isolated system, signing offline, and transmitting the signed transaction through a controlled path.
What It Protects Against
Cold storage defends against the class of attacks that reach keys through connected systems: malware, credential theft, and compromised infrastructure. It does not by itself defend against insider collusion or procedural failure, which is why institutional programs pair it with separation of duties, multi-person approval, and audit.
Where It Fits
Institutions tier storage by exposure. Long-term holdings and the bulk of client assets sit in cold storage. Balances needed for daily settlement sit in warm wallets that can sign faster under tighter limits. The proportion held in each tier, and the controls on moving between them, are core parts of a custody program.