Topic
What is a hardware wallet?
Last reviewed:
- Quick fact 1
Cold wallets keep private keys on a device that is not connected to the internet.
Source: SEC Investor Bulletin: Crypto asset custody basics for retail investors (Dec 12, 2025)
- Quick fact 2
Cold storage keeps keys away from internet-connected devices.
Source: FINRA: Storing crypto assets
- Quick fact 3
If you lose your keys and your backup, you can lose the crypto for good.
Source: SEC Investor Bulletin: Crypto asset custody basics for retail investors (Dec 12, 2025)
The short lesson
A hardware wallet is a small device, often the size of a USB stick, built to hold your private keys. The keys stay on the device. When you send crypto, the device shows the details on its own screen and signs there. Your computer or phone never sees the key.
What it protects against:
- Malware on your computer or phone reading your keys.
- Online hacks of an app that stores keys on an internet-connected device.
What it does not protect against:
- Tricks. If you approve a bad transaction, the device will sign it. Read the device screen every time.
- Losing the seed phrase. The device can be replaced; the seed phrase cannot.
- Fake devices. Buy only from the maker or an authorized seller, never secondhand.
We do not recommend brands. We teach what the object does so you can judge it yourself. Compare hot and cold wallets.
Related terms
Go deeper in Lesson 1: The tool that holds your keys
Common questions
Is a hardware wallet a cold wallet?
Usually yes. Cold means the keys are kept off internet-connected devices.
What if my hardware wallet breaks?
You can restore the wallet on a new device with your seed phrase.
Can I buy a used hardware wallet?
It is not safe. A used or tampered device could be set up to steal.
Does it hold my coins?
No. It holds keys. The coins stay on the blockchain.