Recently, many of my friends around me have been asking me about private key management. Indeed, this is a very realistic issue. Using a hot wallet is quite convenient for interaction, but once private keys are not managed properly, it can easily lead to trouble—there are simply too many cases where people lose funds. That’s also why, in the past two years, cold wallets have suddenly become so popular, and more and more people are starting to consider using them to store long-term assets.

So what exactly is a cold wallet? Simply put, it means keeping your private key on an offline device. The most common option is a hardware wallet. Its core principle isn’t complicated. It comes in two steps: the first step is generating a public key and a private key. The public key is your wallet address, which can be made public and used to receive funds; the private key is your password, controlling all your assets. There is also a recovery phrase (mnemonic seed), which uses 12 or 24 English words to represent the private key for easier memorization. The second step is offline storage. A cold wallet is not connected to the internet, and it prevents hacker attacks through physical isolation—this is its biggest advantage.

When it comes to choosing a cold wallet, you mainly need to consider several aspects. Security is definitely the top priority—you should look for products with strong encryption and multi-factor authentication. Next is compatibility: it must support the cryptocurrencies you hold. You should also consider cost and user experience, because something that’s too complicated won’t be practical to use.

There are quite a few good options in the market right now. The Ledger Nano X is a very popular choice. It’s a French brand, supports more than 5,500 coins, has a security level of CC EAL 5, and costs 149 dollars. The Trezor Safe 5 comes from the Czech Republic and has a touchscreen. It supports more than 1,000 coins, and its security level is even higher—CC EAL 6+—with a price of 169 dollars. There’s also the SafePal S1 Pro. This one is relatively cheaper, at around 90 dollars, but it supports the most coins—over 30,000. It also supports USB-C and scan-to-connect.

Using a cold wallet isn’t actually complicated either. If you don’t yet have a public/private key pair, generate one first using the cold wallet. When you need to use it, you must connect it to your phone or computer, enter your PIN to unlock, and then initiate the transaction. The transaction needs to be verified and confirmed on the device. After confirmation, you disconnect from the network and store it offline, so the private key and recovery phrase are relatively safer. Of course, don’t forget to back them up—you can back up the private key and recovery phrase using paper or a USB drive. Also, one detail: don’t connect to an unknown DApp; otherwise, a cold wallet can be attacked just like a hot wallet.

In comparison, cold wallets and hot wallets each have their own pros and cons. Cold wallets have higher security and are suitable for long-term storage, but they’re more troublesome to operate and require you to spend money to buy a device. Hot wallets are convenient and free to use, but they have lower security and are better suited for frequent trading. According to industry data, the number of users of crypto wallets has continued to grow, and the hardware wallet market is expanding. It’s expected that more innovative products will appear in the future.

Overall, if you have a certain amount of crypto assets that you want to hold long term, a cold wallet is definitely worth considering. When choosing one, base it on your own needs and budget, pick a reliable brand, and along with proper management and backups, you can protect your assets very well.