Recently, I’ve noticed that many people around me are starting to pay attention to cold wallets. The main reason is that private key management in hot wallets is indeed troublesome. There are simply too many cases where assets are stolen or permanently lost due to losing private keys or forgetting seed phrases, so more and more people want to properly store their crypto assets with cold wallets.

I was also a little confused before: what exactly is a cold wallet? Simply put, it means storing private keys on an offline device. The most common form is a hardware wallet. Its working principle actually comes in two steps: first, it generates a pair of public keys and private keys. The public key is like your account—it can be publicly used to receive coins. The private key is like a password, controlling all your assets. Then, those private keys are stored offline, with physical isolation preventing hacker attacks. Many people have also heard of seed phrases, which are 12 or 24 English words and serve as a convenient version of the private key for easy memorization.

There are now quite a few hardware wallets to choose from on the market. Ledger Nano X, produced by a French company, supports more than 5,500 coins, has a security certification level of CC EAL 5, and costs $149. Trezor Safe 5, from the Czech Republic, has an even higher certification level of CC EAL 6+, supports more than 1,000 coins, and is priced at $169. There’s also SafePal S1 Pro—this one is really strong. It supports over 30,000 coins, and is the most affordable at around $90.

How do you choose a cold wallet? I think it mainly comes down to four aspects. Security is the most important—you should look for products with strong encryption and multi-factor authentication. Compatibility also matters: make sure it supports the coins you hold. In terms of cost, prices range from dozens to a few hundred dollars, depending on value for money. Finally, there’s user experience—wallets with a friendly interface are definitely much more convenient to use. You can usually find this information on the official websites, and you can also check user reviews.

The process of using a cold wallet isn’t complicated either. If you haven’t generated the public and private keys yet, you can create them using a cold wallet or a hot wallet. When you need to make a transaction, connect it to your phone or computer, enter the PIN or password to unlock, and then initiate the transaction. After that, you just need to verify and confirm on the device. Once the transaction is completed, power it off and keep it offline—your private keys and seed phrases will be much safer. Remember one thing: don’t casually connect to unfamiliar DApps, otherwise your cold wallet can be attacked as easily as a hot wallet. Also, although hardware wallets have drop-proof and water-resistant features, you should still protect them well. Ideally, back up your private keys and seed phrases using paper or a USB drive.

The fundamental difference between cold wallets and hot wallets lies in how they store data. Cold wallets store private keys offline on physical devices. They are highly secure but more cumbersome to operate, and typically cost between $50 and $500—making them suitable for long-term holding. Hot wallets store data online. They don’t involve physical devices, offer strong convenience, and are free to use, but their security is relatively lower—so they’re suitable for frequent trading.

Based on the data, this sector has quite strong growth potential. The number of crypto wallet users has already reached around 68 million, and the hardware wallet market is expected to grow from $400 million in 2021 to $3.6 billion in 2032. More and more developers are entering this field, and increased competition is actually a good thing: to capture market share, they have to improve security, add support for more coins, and lower prices. For us users, that means more choices, and cold wallets are becoming increasingly worth considering.