As the development of cryptocurrencies progresses, security issues have garnered widespread attention. Cold wallets, which store private keys offline, have become an important means of protecting digital assets. Their emergence is in response to the security risks of hot wallets, significantly reducing the risk of hacker attacks. Hardware wallets integrated with biometric technology and quantum-resistant algorithms further enhance security. The widespread adoption of cold wallets boosts market confidence, promotes liquidity and price stability of crypto assets, and will become increasingly important in digital asset management in the future.