What Is a Crypto Wallet? Hot vs Cold Explained
A crypto wallet doesn’t actually hold your coins — your coins live on the blockchain. What a wallet holds is your private keys: the secret codes that prove the coins are yours and let you spend them. Understanding that one fact makes every other wallet decision clearer. Lose the keys and you lose access; let someone else hold them and you’re trusting that someone else.
Hot wallets vs cold wallets
The big divide is whether your keys are connected to the internet.
A hot wallet is software — a phone or browser app like MetaMask or an exchange’s built-in wallet — that stays online. It’s convenient for everyday use and small amounts, but because it’s connected, it’s more exposed to hacks, malware and phishing.
A cold wallet keeps your keys offline, most commonly on a hardware wallet — a small physical device like a Ledger or Trezor. Transactions are signed on the device itself, so your keys never touch an internet-connected computer. This is the gold standard for anything beyond a small trading balance. See our hardware wallet reviews and our Ledger vs Trezor comparison.
Custodial vs self-custody
There’s a second distinction. With a custodial wallet — like the balance you keep on an exchange — the platform holds the keys for you. It’s easy and you can reset a forgotten password, but you’re trusting the exchange not to be hacked, frozen or to fail. With a self-custody (non-custodial) wallet, you hold the keys yourself. No one can freeze or lose your funds but you, which is the point of the phrase “not your keys, not your coins.” The trade-off: there’s no help desk if you lose your recovery phrase.
Which should you use?
A common, sensible setup for Australians is a mix: keep a small amount on a reputable exchange for active trading, and move anything you’re holding for the longer term to a hardware wallet you control. The larger the holding, the stronger the case for cold storage. Crypto on an exchange is not protected by any Australian government guarantee, so self-custody removes a real risk — see what happens if an exchange collapses.
The one rule that never changes
Whatever wallet you choose, your recovery phrase is everything. Write it down, store it offline, and never type it into a website or share it with anyone — no legitimate service will ever ask for it. Our security checklist covers the rest, and our step-by-step hardware wallet setup shows you how to get started.
This is general information only, not financial advice.
General information only — not financial or tax advice. Verified 2026-08-13; details can change.