Recently, I’ve noticed that many people around me are wrestling with the same question: how can they store their crypto assets more securely? Many people use hot wallets because they’re convenient, but it always feels a bit risky—worrying that one day they could be hacked and stolen. In fact, this is exactly the time to consider buying a cold wallet.

First, let’s talk about what a cold wallet is. In simple terms, a cold wallet is one where your private key is stored on an offline device, completely isolated from the network environment. That way, no matter how skilled hackers are, they can’t launch remote attacks. Most cold wallets refer to hardware wallets, and they also include paper wallets and USB wallets.

The working logic of a cold wallet isn’t complicated. First, the device generates a pair of public key and private key for you. The public key is like your account—you can share it publicly to receive coins. The private key is like your account password: once you have it, you can access all the assets in your wallet. There’s also something called a mnemonic phrase, which is a private key represented by 12 or 24 English words, mainly to make it easy to remember manually. All these crucial pieces of information are stored offline, and physical isolation effectively prevents threats from hackers and malicious software.

There are indeed quite a few cold wallet options in the market right now. Well-known ones include the Ledger Nano X, made by a French company. It supports more than 5,500 cryptocurrencies, with a security certification level of CC EAL 5, and it costs about $150. Another option is the Trezor Safe 5 from the Czech Republic, which has a higher security certification level (CC EAL 6+), includes a touchscreen feature, supports more than 1,000 coins, and costs around $170. There’s also SafePal S1 Pro, which offers good value for money—supports over 30,000 coins, for roughly $90.

How should you choose a cold wallet? I think it mainly comes down to four aspects. First is security—this is the core value of a cold wallet. You need to make sure it has strong encryption and protections like multi-factor authentication. Second is compatibility: it should support the coins you hold. Although most cold wallets support thousands of coins, some only support mainstream coins. Third is cost: price differences are huge, ranging from dozens to several hundred dollars—you need to see whether it’s worth it. Fourth is user experience: a wallet with a user-friendly interface is definitely more comfortable to use.

Once you get a cold wallet, how do you use it? First, if you don’t already have a public/private key pair, you’ll need to generate one. Then, when you want to make a transaction, you need to connect the cold wallet to your phone or computer, enter your PIN to unlock, and initiate the transaction. The transaction must be verified and confirmed on the device. After it’s completed, disconnect it from the internet so the private key and mnemonic phrase return to a secure state. Here’s a special reminder: never connect to an unfamiliar DApp casually; otherwise, your cold wallet can be attacked just as easily as a hot wallet. Also, although hardware wallets have features to protect against drops and water, you still need to take good care of them. It’s best to back up the private key and mnemonic phrase on paper or a USB drive as well.

Compared with hot wallets, the advantages of cold wallets are very clear. Hot wallets store assets online, making them convenient to operate but with lower security, so they’re suitable for frequent trading. Cold wallets store assets offline, making them somewhat more cumbersome to operate but with higher security, which is ideal for holding coins long term. Hot wallets are usually free, while cold wallets generally require an investment of $50 to $500.

From the development trend, the number of crypto wallet users is growing rapidly, and the hardware wallet market is expanding too. Data shows that in 2021, the hardware wallet market size had already reached $400 million, and it’s expected to exceed $3.6 billion by 2032. As competition intensifies, developers are working to improve security, support more coins, and lower prices—this is good news for users. If you plan to hold your crypto for a relatively long time, getting a cold wallet is a good option.