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Ledger nano is one of the product of ledger. They have been known for lots of good products which includes the ledger nano and the ledger s. Each of these has attracted a very large community and also has been recommendable. Ledger blue is a hardware wallet, which was launched in 2016. This wallet comes with an upgrade of technology for hardware wallets which is a touch screen user interface. This makes it very easy to navigate as well as providing better means of including multi signatures. The wallet is not open source which is not good for some people but it keeps your private keys to your device and dose not export to other sites. Getting this wallet is very easy and has a cost very high compared to other. The wallet is smaller and more portable though it contains slightly lower coins than its early versions. It was found that EOS and lisk where completely missing in the wallet. I only see a the hardware design for this wallet to be better than others. But if this still suits you you can go for it.