Self-Custody Wallets Explained: Hot, Cold, and Hardware
The differences between wallet types, when to use each, and how to keep your seed phrase truly safe.
A crypto wallet does not actually store coins — the coins live on the blockchain. A wallet stores the private keys that prove you control specific addresses. Losing the keys means losing access; leaking them means anyone can move the funds.
Hot wallets are software wallets that run on an internet-connected device: a mobile app, a browser extension, or a desktop program. They are convenient for small balances and everyday activity but inherit the security posture of the device they run on.
Cold wallets keep keys on a device that never touches the internet. Hardware wallets are the most common form: a small USB or Bluetooth device that signs transactions internally, so the private key never leaves it. Paper wallets and air-gapped computers are older variants of the same idea.
Whatever type you choose, the seed phrase — usually 12 or 24 words — is the master backup. Anyone who reads it controls the wallet. Store it offline, ideally on metal, in more than one physical location, and never type it into a website, chat, email, or photo.