The main idea behind hardware wallets is to isolate your cryptographic secrets (private keys) from your computer or smartphone, which are easily hackable, in order to protect your bitcoins. You can then send / receive payments and check your accounts, without taking the risk of losing everything.
The Ledger Nano S and Ledger Blue support dozens of cryptocurrencies so you can hold different assets in the same hardware wallet. What’s more? The devices have unlimited capacity: you can basically add and remove applications without losing access to any of your coins.
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