Recently, I’ve noticed that many people around me are paying attention to the topic of cold wallets, mainly because everyone is interacting on-chain more frequently. However, the issue of private key management really is a headache. I’ve also gone through a situation where a friend lost their seed phrase and couldn’t recover their assets, so my understanding of the need for cold wallets is quite deep.

First, let’s talk about what a cold wallet is. Simply put, a cold wallet is a cryptocurrency wallet that stores private keys on an offline device. It usually refers to hardware wallets, and it also includes things like paper wallets or USB wallets. Unlike hot wallets (mobile app wallets or computer software wallets), the core advantage of a cold wallet is offline storage—hackers and malicious software basically can’t attack it remotely.

The working principle is actually not complicated. When you set up a cold wallet, it generates a pair of public and private keys. The public key is your address, which can be publicly used to receive funds, while the private key is like your account password—it controls all the assets in your wallet. Many people have also heard of seed phrases; they’re essentially another form of the private key, usually consisting of 12 or 24 English words, mainly to make them easier to remember. The key point is that these private keys are stored physically in isolation, not connected to the internet, which effectively prevents theft.

There are indeed quite a lot of cold wallet options in today’s market. Let me introduce three popular hardware wallets. Ledger Nano X is made by the French Ledger company; its security certification reaches the CC EAL 5 level. It supports more than 5,500 cryptocurrencies and costs $149. Trezor Safe 5 is from the Czech Republic; its security certification is even higher, reaching CC EAL 6+. It has a touchscreen, supports more than 1,000 coins, and is priced at $169. There’s also SafePal S1 Pro, certified CC EAL5+, which supports USB-C and QR code connections. It supports over 30,000 coins, and its price is the cheapest—about $90.

When choosing a cold wallet, I think you mainly need to consider four aspects. First is security—this is the core selling point of cold wallets. You should look for products with strong encryption and multiple layers of verification. Second is compatibility: make sure it supports the coins you hold. Although most cold wallets support thousands of coins, some only support mainstream coins. Next is cost. Prices range from tens to a few hundred dollars, so it depends on your needs and budget. Finally, there’s user experience. A wallet with a friendly interface is definitely more comfortable to use and makes it easier to manage assets.

When using a cold wallet in practice, first you need to generate a public-private key pair through it, or import an existing private key. During transactions, you need to connect it to your phone or computer and enter a PIN or password to unlock. After initiating a transaction, verify and confirm it on the device. When finished, disconnect and go offline. This keeps the private key in an offline state at all times, making it relatively much safer. But be careful: never connect to unknown DApps casually, otherwise a cold wallet can still be attacked like a hot wallet. Also, although hardware wallets are designed to be drop-proof, water-proof, and fire-resistant, you still need to store them properly. It’s best to back up the private key and seed phrase with paper or a USB drive.

Let’s compare cold wallets and hot wallets. Cold wallets store data offline, offering high security but more complicated operation. They’re suitable for long-term storage and usually require an investment of $50 to $500. Hot wallets store data online: they’re convenient to use but relatively less secure, making them suitable for frequent use, and most are free. So these two types of wallets each have their own use cases—they’re not an either/or situation.

From market trends, the number of cryptocurrency wallet users continues to grow. According to data, the market size of hardware wallets is expanding steadily. More and more developers are moving into this field, competition is becoming fierce, and that’s actually good news for users. To compete for market share, developers have to work hard on security, cross-chain support, the number of supported coins, pricing, and more. Therefore, if you’re considering choosing a cold wallet to hold your long-term crypto assets, the options today are indeed much more abundant than before—and also more mature.