Prokey Optimum is a web-based hardware wallet that allow you manage 1500+ cryptocurrencies through a browser only, without install any application and bridges. on the other hand, it's protected from supply-chain attack because of using mutual authentication. in other words, If a device is tampered physically, it cannot be used to gain access to the wallet due to an authentication needed from the servers. Prokey Optimum hardware wallet features

Secure Firmware with mutual authentication supports Bitcoin, Ethereum, Litecoin, Bitcoin-cash, USDT and 1200+ cryptocurrency Manage through a web browser only Manage all digital assets in one single platform Easy to use for newbie and non-technical users Support USDT on both Omni and Ethereum blockchain (ERC20)