What is Cold wallet?

A cold wallet is one whose private keys never touch an internet-connected device. The usual form is a hardware wallet, a small device that holds the keys and signs transactions inside itself, so that even a compromised computer only ever sees a signed transaction and never the key. A paper backup of a seed phrase in a safe is the extreme version. The opposite is a hot wallet, a browser extension or phone app whose keys live on a connected device for convenience. Many people run both: a hardware wallet for the bulk of holdings and a hot wallet with a small float for daily use.

The trade is between safety and friction. A cold wallet is the right home for assets you intend to hold and rarely move, because every transaction requires the physical device and a deliberate confirmation on it. It is a poor tool for daily activity, and it is a poor tool for checking a balance, because each session with the device is exactly the exposure the device exists to minimize. The device's screen is the only trustworthy place to confirm an address before signing.

That last point is the one people get wrong. The addresses a cold wallet controls are public, like any other address, and can be read by anyone without the device. A balance check, a history review or a full portfolio view needs no session at all; it needs the addresses. Plugging the device in to look at a number treats the safest object you own as a viewer.

TrueHold tracks hardware wallets by the addresses you paste, never by connecting the device, and never by importing an extended public key. Ledger and Trezor have their own coverage pages describing which chains are read and which are not, and the Ledger guide in the blog walks through the workflow.

A hardware wallet is not a backup; the seed phrase is. The device can be lost or broken and the funds restored on a new one from the phrase, which is why the phrase deserves more protection than the device itself.