What is a Crypto wallet?

What is a crypto wallet and how does it work?

A crypto wallet doesn't store your cryptocurrency directly. Your coins and tokens live on the blockchain, a public ledger shared across a global network of computers. What your wallet actually holds are your cryptographic keys: a public key, which works a bit like an account number others can send funds to, and a private key, which authorises any outgoing transaction.

Losing your private key means losing access to your crypto, since there's no central authority, like a bank, that can reset it for you. This is why keeping your keys secure, whether through a password-protected app or an offline hardware device, is central to using crypto safely.

Every time you send or receive crypto, your wallet uses these keys to sign the transaction and broadcast it to the network, without ever exposing your private key itself.

Custodial vs Non-custodial wallets 

The first decision most crypto users face is who controls their keys. Custodial wallets are managed by a third party - usually an exchange - while non-custodial wallets put you in complete control. Neither is inherently better; the right choice depends on how much responsibility you want to take on.

Types of crypto wallets

Beyond the custodial/non-custodial split, wallets also vary by form factor and how they connect to the internet. Here are the four types you'll come across most often.

1. Hot wallets

Hot wallets are connected to the internet, typically as a mobile app, browser extension, or desktop program. They're quick and convenient for everyday transactions, but their constant connectivity makes them more exposed to phishing, malware, and other online threats.

2. Cold wallets

Cold wallets keep your private keys completely offline, away from any internet-connected device. They're generally considered the more secure option for larger balances or long-term holdings, though they trade some convenience for that extra protection.

3. Hardware wallets

Hardware wallets are a type of cold wallet: physical devices, often resembling a USB stick, that store your keys offline and only connect briefly to sign a transaction. Popular examples include Ledger and Trezor devices.

4. Paper wallets

A paper wallet is the simplest form of cold storage. A physical printout of your public and private keys, sometimes as QR codes, they carry no digital attack surface, but they're vulnerable to physical damage, loss, or theft if not stored carefully.

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Is a crypto wallet safe?

Crypto wallets can be very secure, but how safe yours is depends largely on the type you choose and the habits you follow. Non-custodial and cold wallets reduce your exposure to exchange hacks, since your keys never sit on a third-party server. The trade-off is that you become fully responsible for protecting them yourself.

Simple habits can make the biggest difference: back up your seed phrase somewhere offline, never share it with anyone, and stay alert to phishing attempts that imitate legitimate wallet providers. Kaspersky identified more than 5.84 million phishing attempts targeting cryptocurrency users in 2024, a reminder that vigilance matters as much as the technology itself.

Do you need a crypto wallet to buy crypto?

Not necessarily. Many exchanges let you buy, hold, and trade crypto within a custodial wallet they manage on your behalf, which can be a straightforward way to get started. However, a personal wallet (particularly a non-custodial one) gives you direct control of your private keys, which many investors prefer once they're holding larger amounts or want to use their crypto beyond simple trading, such as in decentralised finance (DeFi).

If you're unsure which approach suits you, it's worth weighing convenience against control, and considering independent financial advice for significant decisions. IG does not provide personal financial advice.

Crypto wallet FAQs