Ledger is a well-known solution for protecting, buying and exchanging cryptos. It is a so-called cold wallet or hardware wallet, comparable to a purse for cryptocurrencies, which contains the personal keys (important information for authorizing transactions in the blockchain space). In contrast to "hot wallets", this absolutely important information is stored in a secure hardware device and not on the web. The main idea behind such hardware wallets is to isolate the important private keys and make them inaccessible via the much easier hackable digital devices like PC or smartphone. This brings with it correspondingly great protection against digital hacks, but of course it also creates new risks such as the physical loss of the hardware. Other well-known hardware wallets are Trezor and Lattice1.