Cold Storage: Offline Protection for Access to Crypto Assets
Cold storage reduces the risk of network attacks by keeping private keys offline, making it suitable for assets that are not accessed frequently. Devices do not store the cryptocurrency itself; what truly needs protection is the private key and the recovery wallet’s mnemonic phrase.
How Cold Storage Works
Cold storage keeps the private keys used to control blockchain funds in an offline environment, reducing the risk of direct exposure to internet-connected devices. It still requires protecting the device, backups, and signing process; if a user exposes the mnemonic phrase or signs a malicious transaction, offline storage cannot prevent the loss. Hot wallets are more convenient for frequent operations.
Common Offline Storage Methods
A hardware wallet generates, stores, and uses private keys to sign transactions within the device; the private keys do not leave the device when it is connected to a computer to broadcast transactions. An air-gapped signing device transfers data only through QR codes or a microSD card, further reducing the attack surface created by connections. Paper wallets are vulnerable to fire, water, and physical damage and are generally no longer recommended.
Mnemonic Phrases and Recovery Mechanisms
Modern cold wallets typically generate a mnemonic phrase consisting of 12 to 24 words, which is used to restore access to funds if the device is lost, stolen, or damaged. The mnemonic phrase should be recorded offline and stored separately from the device in a secure location; do not screenshot it, upload it to the cloud, save it by email, or disclose it to anyone else.
Safe Usage Guidelines
Hardware wallets should preferably be purchased through the manufacturer’s official channels, and the device should generate the keys itself during initial setup; if the packaging contains a prewritten mnemonic phrase, it should be treated as a security risk. Firmware updates should come only from official channels, and the recovery backup should be verified as usable before transferring funds. If both the device and the mnemonic phrase are lost, the funds generally cannot be recovered.
Original Tutorial
https://www.binance.com/zh-CN/academy/glossary/cold-storage
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