Recently, there's an interesting news story: a certain politician's cold wallet was seized by authorities and is still being cracked. This made me think that many people actually don't understand what a cold wallet is, let alone why it's so hard to crack.

First of all, the most basic point is that cryptocurrency wallets are not actually places where you "store" money. Many beginners get this confused. It’s actually a digital tool used to store, send, and receive virtual assets—kind of like a passport in the blockchain world. The three core components inside a wallet are the private key, public key, and address. Among these, the private key is the real treasure. It’s a 256-bit random number, and only you have it, which allows you to control the assets in the wallet. If someone else learns your private key, your cryptocurrencies are gone.

Currently, there are two main types of wallets on the market. Hot wallets are connected to the internet, like exchange wallets or browser plugins such as MetaMask. They are very convenient to use but also carry higher risks. For example, the FTX case shows this clearly: storing coins on an exchange’s hot wallet means that if the exchange gets into trouble, your assets are also at risk. After FTX collapsed in 2022, about 450k BTC were transferred out by users from exchanges. One major exchange transferred out 90k BTC in just one week in December, and Coinbase also withdrew over 200,000 BTC within a month. Everyone was scared.

In contrast, what is a cold wallet? Simply put, it’s a hardware device that stores private keys completely offline. It could be a USB stick, a hard drive, or a card. You only connect it to a computer when you need to make a transaction, greatly reducing the risk of hacking. Popular brands include Ledger, Trezor, and Taiwan’s Coolwallet. Prices range from about $100 to $250, supporting thousands or even tens of thousands of tokens, including NFTs.

So why is it so hard to crack a cold wallet? Because the private key is not stored online at all, hackers have no internet entry point. Even if you lose the physical device of the cold wallet, as long as you remember the private key and seed phrase, you can recover your assets. The assets themselves exist on the blockchain; the cold wallet is just a reading tool. That’s why, if a politician’s cold wallet is seized and being cracked, they need the private key to actually access the assets.

However, it’s important to note that you must buy a cold wallet directly from the manufacturer. When it arrives, check that the packaging is intact to avoid tampering or installing malicious software. If you’re a long-term holder, the safest approach is to use a hot wallet for daily transactions and store the coins you don’t need to move in a cold wallet. This way, you enjoy the convenience of trading while maximizing the security of your assets. Understanding what a cold wallet is and why to use it is simple—just remember to recognize the risks and don’t keep all your coins on exchanges waiting to be misappropriated.