Bitcoin is on everyone's lips now and if last year some people knew about it, but not like every second as now. And if not all, then most people know that Bitcoin is built on the blockchain, this is actually all its charm. So, I guess it's curious not only for me to know where else is blockchain used in examples in the real world.
Ledger Nano S is a cold storage or hardware wallet to store and make transactions in cryptocurrencies like Bitcoin, Ethereum, and other altcoins. It's powered by USB connectivity. It's the most secure way to store crypto assets because it's not connected to the internet unlike digital wallets, that's why it calls cold storage, it's almost impossible to hack.