What is a crypto wallet, really?

The word "wallet" is a useful lie. Nothing is stored inside it. Your coins live on the blockchain; the wallet simply holds the cryptographic keys that prove those coins are yours to move.

Keys, not coins

Every wallet is built around a pair of keys. The public key is an address you can share to receive funds. The private key is the secret that authorizes spending. Whoever controls the private key controls the money — full stop.

Not your keys, not your coins. It sounds like a slogan because it is one — but it is also literally true.

Custodial vs. self-custody

• Custodial: an exchange holds the keys for you. Convenient, recoverable, but you are trusting a third party.
• Self-custody: you hold the keys. Full control, full responsibility — lose the backup and no one can help you.

Hot vs. cold

A hot wallet is connected to the internet — a browser extension or phone app, good for everyday spending. A cold wallet keeps keys offline on a dedicated device, better for long-term savings you rarely touch.

The one thing to protect

When you set up a self-custody wallet, it shows you a recovery phrase — a list of words that can regenerate your keys. Anyone with that phrase has your money. Write it down, keep it offline, and never type it into a website.