I purchased the Duo to have BTC wallet storage away from a computer and to have a full hardware backup and this product does just that. Very satisfied with how it works!
If you're considering buying a hardware signing solution for Bitcoin, I recommend the Ledger Nano over Trezor. As of this review, 5/15, I think this is a great solution along with Coinkite for securing your BTC. This is not for newbies and I encourage anyone interested in BTC to utilize and play with as many wallets as possible which will give you and understanding and comfort level on how best to implement your own security. Now, let's go over the negative parts of the Nano first. The device itself will constantly need to be reflashed as updates come out. The UI is very basic and you'll end up plugging and unplugging it multiple times. You'll need your 24 word seed and recovery code. This is something that you should WRITE down and NEVER SAVE ON A COMPUTER FOR ANY REASON. While this is a real pain, it is of utmost security to not have this information digitally saved. Have a system down where you can keep the seed and recovery for immediate use and copied down in a safe location such as a safe deposit box. If you lose these, you could potentially lose all your bitcoin stored in your Ledger wallet. The Ledger wallet itself is very minimal and must be accessed through a Chrome browser. Smartphone access is promised for the future. Now, let's talk about the good parts of the Nano. A four digit PIN is required each time you log in. If you put in the wrong PIN three times in a row, the seed is wiped out and the card must be reflashed (thus the need to have access to your written down seed and security code). Where I think this shines is for multisig wallets and in particular, how this is now available in Coinkite. With Coinkite, I can have one co-signer as my Coinkite signin and have a second cosigner as the Ledger Nano. For my purposes a 2 of 2 signature is more than adequate security. For someone to hack my BTC, they will need to know my Coinkite log in, have access to my phone for 2FA (and know my phone PIN), physically have my Ledger Nano, and know my Ledger Nano PIN. I bought the duo so I have one Nano for frequent use and keep the other Nano (identical seed) in another remote secure location. So what happens if I lose my Nano? As long as I have my seed and security code, I can recreate my hardware key. This is as secure a system that protects me from bad actors and also from myself if I happen to do something wrong. So before you buy this product, I highly encourage you to experiment with web wallets (good for beginners with small amounts of BTC), brain wallets such as Electrum and Armory, HD wallets and even Trezor. But using Nano as a hardware key in a multisig wallet like Coinkite makes the most sense at this point in time.
I bought the duo since it was only $** more and it's good to have an extra. It has a very easy screen and you don;t need to worry about much. Your Bitcoins are safe from malware and also from keyloggers which have made a return since they are more stealth than they used to be. You are best to create account air-gapped or offline. Just to be safe. Once created, you can even use this on even non-secured computers with no fear of malware or keyloggers. It tracks all of your sending and receiving keys, and you need not be online to receive them, it will update the exchanges when you connect. It does use a Chrome app, but you don't need to use Gmail just launch it. I don;'t use Chrome or Google. But to just connect and send//receive, have it save and issue keys for both and display your sum total -it's easy and you can transfer in BTC from other wallets. Transfer your Bitcoins in from any other wallet and you have them safe. If lost, it will reset to factory settings after 3 incorrect tries at 4 digit pin code. You can then retrieve your account with the other one using a 12 word Electrum type 24 word key which generates your wallet. You save on card they provide and put in leather slip somewhere safe.. No one can get your wallet number and you can always restore. I don't have to enter keys to connect, other than 4 digit pin. I think they're great and very affordable compared to alternatives. Github offers support if you wish to use one ledger wallet for certain alt coins. Once you have btc fraction in first wallet (which you can name) you are free to create multiple wallets. They are very tiny so put on a firm key chain or one cord they provide. Keep one home, take one with you. LOVE It. There is an additional app for businesses with tons of functionality and financial functionality and billing, accounts receivable, payable. I found it here and for a great price. Delivered extremely fast, and it really is simple to get up and running. Read reviews that were silly. The same care you need take with your generated seed (the words) has to be taken with any wallet id or seed generation/re-generation of wallet and with a case for the cards provided, kept safe somewhere externally, you are worry free. Small but well-manufactured.. 30 years of use! LOVE THIS.
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