Recently, many people have been discussing cold wallets, especially after some high-profile cases exposed law enforcement seizing cold wallets, leading more people to wonder what exactly this thing is and whether it's really that hard to crack.

When it comes to cryptocurrency wallets, many people initially don't understand them clearly. Simply put, a wallet is like a combination of your ID and bank account in the blockchain world. It doesn't actually store virtual assets somewhere; it's a digital tool that allows you to send and receive cryptocurrencies and NFTs. The core of a wallet consists of three things: private key, public key, and address.

Among these, the private key is the most critical; it is the only proof that you truly own the wallet. The private key is a 256-bit random number, unique worldwide, and whoever has it can access the assets inside. Therefore, the private key must be kept secret and never leaked. The public key is used by miners to identify your wallet, and the address is your location on the blockchain, used to receive assets.

Wallets are generally divided into two types: hot wallets and cold wallets. Hot wallets are always connected to the internet, including exchange wallets, browser plugins (like MetaMask), and mobile apps. These are very convenient for trading, signing transactions instantly to withdraw funds, but the risk is that being constantly online makes it easier for hackers to attack. Especially with centralized exchange wallets, your assets are essentially held in custody by the exchange. The FTX bankruptcy a few years ago was a stark example; despite attractive interest rates, people rushed to withdraw their assets in panic.

In contrast, cold wallets store private keys offline using physical hardware (like USB devices or hard drives), only connecting to a computer when making transactions. This way, hackers have no chance to steal your private key over the network. Common cold wallet brands include Ledger, Trezor, and CoolWallet, priced around $100 to $250. Even if a cold wallet is lost or damaged, as long as you remember the private key and seed phrase, you can recover your assets because the assets themselves are stored on the blockchain; the cold wallet is just a reading tool.

Regarding the issue of cold wallets being cracked, in theory, the cryptographic design of private keys makes cracking nearly impossible. But in practice, when purchasing, you should order directly from the official link, and upon receipt, check the packaging integrity to avoid malicious software being installed.

Many people's current strategy is to use hot wallets for daily transactions for convenience and quick access, while storing long-term assets in cold wallets for peace of mind. Especially after the FTX collapse in 2022, data showed that 450k BTC were transferred from exchange hot wallets to cold wallets, and a major exchange withdrew 90k BTC within seven days. This reflects that investors still prefer to manage their assets themselves when facing market risks.

Therefore, when choosing a cold wallet, it’s best to consider your budget, the number of tokens you hold, and your usage habits. For beginners, it’s smarter to start with hot wallets to familiarize yourself with the blockchain world, and only consider moving to cold wallets once your assets grow larger. That’s a more prudent way to manage your assets.