Recently, I’ve come across many friends who lost their assets due to improper private key management, which made me realize that the importance of cold wallets has really been underestimated. As on-chain interactions become more and more frequent, more and more people are starting to recognize a key issue: although hot wallets are convenient, their security risks are simply too high. That’s also why demand for cold wallets is growing rapidly.

Let’s first talk about what a cold wallet actually is. Simply put, a cold wallet is a wallet that stores private keys on an offline device—typically referring to a hardware wallet, but it can also include paper wallets or USB wallets. Its core advantage is physical isolation: hackers and malicious software can’t even access your private keys. By contrast, while hot wallets are easier to operate, because they connect to the internet, they carry relatively higher risk.

The way a cold wallet works is actually not complicated. First, it generates a pair of public and private keys using encryption algorithms. Your public key is your wallet address, which can be publicly used to receive assets; your private key is like your account password, holding the authority to control all the assets in the wallet. Sometimes you may also see a mnemonic phrase—this is another form of the private key, usually consisting of 12 or 24 English words, intended to make it easier to remember. Then, the cold wallet stores these critical pieces of information on the offline device, effectively preventing network attacks.

There are quite a few hardware wallet options available in the market. Three relatively well-known ones are: Ledger Nano X, produced by the French Ledger company, supporting more than 5,500 cryptocurrencies, with a security level of CC EAL 5, priced at 149 USD; Trezor Safe 5, from the Czech SatoshiLabs, with a security certification of CC EAL 6+, supporting more than 1,000 coins, priced at 169 USD; and SafePal S1 Pro, supporting over 30,000 cryptocurrencies, the most affordable at around 90 USD. These three models each have their own strengths, and which one to choose depends on your needs.

So how do you choose the right cold wallet? I think there are four main aspects to consider. Security comes first—you should look for products that use strong encryption technologies and support multi-factor authentication. Next is compatibility: make sure it supports the cryptocurrencies you hold. Then there’s cost: cold wallets range from dozens to a few hundred dollars, so it depends on value for money. Finally, user experience: a wallet with a user-friendly interface makes it easier to manage your assets. This kind of information can usually be found on the official website, and you can also check reviews from other users.

Using a cold wallet in practice is also not difficult. If you don’t yet have a public-private key pair, generate one first using either a cold wallet or a hot wallet. Then, for each transaction, connect the cold wallet to your phone or computer, enter your PIN or password to unlock it, initiate the transaction, and verify and confirm on the device. After the transaction is completed, disconnect it—your private key returns to an offline state, greatly improving security. However, be sure not to connect to unknown DApps casually, or your cold wallet could also face risks. In addition, even if a hardware wallet has drop-proof and waterproof functions, you still need to protect it well, and back up your private key and mnemonic phrase using paper or a USB drive.

According to market data, the number of cryptocurrency wallet users has already reached more than 68 million, and the hardware wallet market is growing even faster. In 2021, it was already a 400 million USD scale, and it’s expected to reach 3.6 billion USD by 2032. Such growth has attracted a large number of developers, and competition has become increasingly fierce—but that’s good news for users. To win market share, manufacturers are improving security, supporting more coins, and lowering prices, which means the overall user experience of cold wallets continues to improve.

In short, if you hold a large amount of cryptocurrency assets or plan to hold for the long term, setting up a cold wallet is truly necessary. It may cost some money, but compared with the risk of your assets being stolen, this investment is absolutely worth it.