Bitcoin Trezor Reviewed – is it that safe?

In a previous post we talked about Bitcoin security tips which included backing up your wallet, using 2 factor authentication and keeping your Bitcoins in cold storage. In my last visit to Shanghai for a Bitcoin Expo I met Alena, the CEO of TREZOR – a device that seems be an optimal solution for Bitcoin security. That’s why I decided  to create this Bitcoin TREZOR review.

More Bitcoin security = Less flexibility

When you look at the various options for Bitcoin security the more secure the methods is – the less flexibility you have in spending your coins. For example, storing your coins on a secure paper wallet, which is considered pretty safe allows you only to deposit coins. When you want to withdraw them you will have to find a Bitcoin client and export your private keys.

What is TREZOR and why is it different ?

TREZOR is an offline Bitcoin wallet. It holds your private keys and know how to sign a transaction without the need to connect to the internet. Trezor seems to give you the best of both worlds as it acts as a highly secured cold storage (i.e. offline) device but still allows you flexibility when wanting to spend your coins. The device is pretty small and you can carry it around on your Keychain or even in your pocket. So you can store your Bitcoins offline on TREZOR and whenever you want to spend them just connect your TREZOR device to any computer and you can spend them. TREZOR uses a limited USB connection – just like your computer mouse or keyboard. A mouse tells the computer where it is, but the computer cannot move the mouse. So only Bitcoin transactions can go from the computer to Trezor and back. This is why even compromised and infected computers can be used with TREZOR safely. 99bitcoins Trezor And what if it gets stolen ? Well, the security measure that I’ll explain later on prevent someone from stealing your Bitcoins even if they steal your TREZOR device.

How to setup TREZOR

Setting up TREZOR is pretty simple. You hook up the device to the computer, install a “bridge” which allows the TREZOR to communicate with the computer and follow the instructions.

Choosing a PIN code

A PIN code will be used to identify that you are the actual owner of the TREZOR each time you plug it into a computer.  The setup process is that is uses a cleaver combination of both the TREZOR device and the computer in order to make sure it will be pretty damn hard to steal you PIN. It will ask you to click the relevant numbers on your computer screen like this: Trezor pin code pad Meanwhile the display of the actual numbers is only visible on your TREZOR: trezor pin code device This way even if someone is monitoring your keystrokes they won’t be able to know what your PIN is. When you are setting up your TREZOR for the first time, you’ll have to enter your new PIN twice. Notice that the numbers shown on TREZOR change between the entries.

Jotting down the TREZOR seed – your master private key

Next you will be prompted to write down your recovery seed. Your seed is a list of secret set of words that you will use to recover your money in case you ever lose your TREZOR. The device will show you a list of 12 words (you can choose more for additional security) which you will need to write down. This list should be kept in a safe place as it can be used to recover your private keys. trezor seed recovery

You’re good to go!

Once you finish the setup you will need to connect the TREZOR to any computer and access – This is the client for the Bitcoin TREZOR. From there you will be able to send Bitcoins to whoever you like. Trezor web interfacce Can TREZOR be hacked ? One of the great things about TREZOR is that there’s no “username” or “password” for your account. Your credentials are your TREZOR device. So if someone doesn’t get physical access to my device there’s no way he can access my account. But if someone could get access to my device ? how about your evil made ?!? The “Evil Maid” attack is a name given for an attack that is made physically (not remotely) on a computer that is left unattended. The attacker has the ability to physically access the computer multiple times without the owner’s knowledge – just image that you had a house maid that was evil :)

For extreme protection – set up a passphrase

In case of an “Evil Maid” your seed and private keys are at risk. TREZOR has solved this by allowing you to add an additional passphrase protection. This means that you will remember a phrase that will be used for accessing your Bitcoins. The passphrase shouldn’t be written down anywhere and should be memorized.

How about extortion ?

When all things fail, physical force can be the last thing that will be used to get access to your Trezor, also known as the “5 dollar wrench attack” as explained in the following image: 5 dollar wrench For this scenario you can use different passphrases – each one leading to a different amount of coins. So you will “give away” the decoy passphrase leading to a small amount of coins while keeping the majority of your coins secure.

So is TREZOR 100% full proof secure ?!?

No. Nothing is, but it’s as close as it gets. Even the latest security flaw found in USB drives doesn’t apply to TREZOR. One thing that TREZOR can’t protect you from is phishing attacks. This means that someone can try and fool you by having you send Bitcoins from your TREZOR to a wrong address. However, this is not a device malfunction – it’s more of a human malfunction. You need to make sure that the person you are sending your Bitcoins to is who they say they are ( here’s my own experience with phishing). For detailed information about possible TREZOR threats and how they are being dealt refer to TREZOR’s security threats section inside their FAQ.

Additional thoughts about the TREZOR

My experience with TREZOR was extremely pleasant. The setup was easy, the device is intuitive and the security measures seem pretty robust. I also was very impressed with the company’s team as they seem to be very skilled professionals in the field of Bitcoin security. Anyone who’s serious about their Bitcoins’ security should get a TREZOR. My only concern with TREZOR is regarding their Bitcoin client. I mean, let’s say the company goes out of business – how will I still be able to send my Bitcoins if the client is inoperative ? Well apparently several wallets out there have already began working on TREZOR compatibility. For example, Electrum has a TREZOR plugin which allows you to enjoy TREZOR’s enhanced security with Electrum’s flexibility.

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Ofir Beigel

Owner at 99 Coins ltd.
Blogger and owner of 99Bitcoins. I've been dealing with Bitcoin since the beginning of 2013 and it taught me a lesson in finance that I couldn't get anywhere else on the planet. I'm not a techie, I don't understand "Hashes" and "Protocols", I designed this website with people like myself in mind. My expertise is online marketing and I've dedicated a large portion of 99Bitcoins to Bitcoin marketing.

TREZOR Bitcoin wallet

TREZOR Bitcoin wallet

Ease of use






        Price tag





            • Easy to use
            • Extremely secure
            • Portable design


            • Price tag a bit high


            1. Sandy Cumbria on

              Hi Ofir,

              I purchased a TEZOR device and installed on my Apple until I reach the window ‘No Transactions Yet’. I went to my account at Coinbase and made an initial purchase of 1 ETH as a test run with my TEZOR connected. I am awaiting the receipt of my 1 ETH on Coinable – about 9 days. Now how do I send my ETH + future Bitcoin/ETH coins to my TEZOR.

              I went on my PC and tried to install TEZOR (after installing Chrome) and it analyzed for 36 + hours to no avail. I then went to my Mac and see above.

              Thanks for cleaning my confusion.

              • Ofir Beigel on

                Hi Sandy, the TREZOR set up should take about 5 minutes. So if it got stuck for a lot of time probably something went wrong. I suggest trying to restart the process. If that doesn’t work try contacting TREZOR support as they probably have a way to reset the device so it will work (or they will replace it).
                The setup is pretty straight forward and shouldn’t take too much time. Sorry I couldn’t be of more help.

            2. please get me connected to the company that manufactured the wonderful TREZOR, i want be one of their sales representive in my country.

              alot of people in my country has joined the bitcoin industry but fear is on how to secure their coin. but with inception of TREZOR , more people will come into the industry.

              please kindly put me through . i need to get TREZOR atleast for myseif and the rest ofn my team.
              \i am wiling to facilitate for the company because is good product the wil see the light of the in my country.

            3. If I sign up for Trezor can I buy bitcoins with my credit card (or debit card)? What countries do you do exchange/purchases with?

            4. Ease of use






              Price tag




              Why not get both? You will have to wait until the Case hardware wallet ships this summer but it will be much more convenient to use than Trezor. If you do not want to spend the cash for a Trezor and have a spare laptop you can achieve the same level of security by using the cold storage option available in the Electrum wallet. This option lets you keep your private keys on a computer that never connects to the internet. To make a transaction you have to use a USB drive to transfer data between your online Electrum wallet and the offline portion.

            5. “When you want to withdraw them you will have to find a Bitcoin client and export you private.”

              Guys, please, do a grammar check.

            6. Anthony Wilson on

              TREZOR is one of the most intuitive devices I’ve ever used, also their staff is pretty awesome. I highly recommend this to anyone who deals with Bitcoins!

            7. I like the fact that you don’t need any kind of username and password for this to work! It’s actually easier for me to remember a passphrase than an actual password! Call me crazy, but that’s how it is.

            8. It’s interesting how TREZOR works in case you lose/forget
              your passphrase. From what I understand, you just have to give it different
              passphrases that are somehow related to your first one? Did I get this right,

              • No, if you lose your passphrase you’re basically screwed – no one will be able to retrieve your coins. The passphrase is the one thing that shouldn’t be written down anywhere and that must be memorized.

            9. I think it’s only a matter of time before most companies
              (if not all) start working on TREZOR compatibility. This is a very solid device
              in my opinion, and considering they are working on it continually, it can only
              get better. I hope they can stay ahead of the hackers…

            10. Elijah Thomas on

              What happens if the TREZOR gets stolen from you? Can someone hack into your account if they have your TREZOR?

              • The TREZOR by itself is no good. You still have a PIN code protection. If someone gets a hold on your TREZOR and your PIN only then they can steal your money. It’s advised not to keep the two together.

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