According to CoinMeta, hardware wallets are specialized physical devices, typically the size of a USB flash drive or a credit card, used for generating and storing the private keys of cryptocurrencies. They represent a form of "cold storage" since the private keys remain offline. The main advantage of hardware wallets is their isolation; even if there is malware on the computer, attackers cannot extract the private keys from a well-designed hardware wallet or approve transactions without user confirmation. In recent years, hardware wallets have evolved, moving from small screens and bulky interfaces to modern devices that integrate Bluetooth, NFC, and even touchscreens and cameras. Companies such as Trezor and Ledger Nano hold an important position in the hardware wallet market. The latest device launched by Ledger Nano aims to expand its functionality by supporting messages, applications, and proxy finance.