Bitcoin is a fast-paced, vast community.
There always seems to be something new, or an array of technical words that are hard to understand, especially when it's your first experience with cryptocurrency.
Don't worry, you're in the right place!
Coldcard is the best you can get for security, and has a TON of features! This can sometimes be confusing, as there are plenty of advanced topics, and security features that can be intimidating for beginners of Bitcoin.
While the Coldcard has many advanced security features, these are all additional. You can start with the basics, and your wallet can grow with you. No need to keep buying hardware that your security needs outgrow!
This guide will act as an introduction to the Coldcard's basic functions for your knowledge to branch from.
The Coldcard, also known as a Hardware Wallet, is a great way to secure your Bitcoin. It is made to contain your Seed phrase, and the corresponding private keys, which should never be known to any Internet-connected software wallet.
Coldcard works hand-in-hand with the software wallet to keep your Bitcoin safe. Software wallets are a tool to view all of your transactions, create addresses to allow others to send bitcoin into your wallet, and create transactions to send Bitcoin to others from your wallet.
When a Software Wallet is working with the Coldcard, it makes it mandatory to have each outgoing transation be "signed" by the Coldcard. "Signing" a transaction can only be done by a person who has access to the Coldcard associated with the wallet.
Setting up your Coldcard should be fairly simple, just follow along with our Quickstart Guide, here!
That guide will help you unbox and set up your Coldcard. from opening your Tamper Evident Bag, to receiving, and sending funds.
Please see a more simplified version of the guide here.
Coldcard is known for having the most advanced security you can get on the market for your Bitcoin. There are so many layers of security you can apply to your wallet, that it can be hard to know your options.
Below are the two main ways to safely use your Coldcard to control your Bitcoin.
Using Coldcard via USB is the easiest way to sign transactions, because it's very straight forward.
It's as easy as Setting up Your Coldcard with Electrum and using your Coldcard as a signing device for every outgoing transaction!
Using with Electrum via USB
Using the Coldcard offline is recommended to keep your funds as safe as possible. The process to get started, and to make transactions is a little more tedious, but well worth it, in our opinion.
This method is called an "Air-Gapped Transaction" because there's no immediate connection from the seedphrase (stored in your Coldcard) and an internet-connected device/computer.
Instead of Connecting your coldcard right to an internet-connected computer, you are keeping all of your important information (your seed phrase) offline, and inaccessible to any possible hackers. This method will require a MicroSD, and a Coldcard.
The Air-Gapped method works by copying a skeleton wallet (watch-only wallet) onto the MicroSD from your Coldcard, and exporting it to your software wallet. This is safer than the USB method, because the skeleton wallet does not contain your seedphrase. There's only enough information in the skeleton wallet to view your transactions, create addresses to receive Bitcoin, and make a PSBT.
Without the Coldcard to "sign" the outgoing tracations, the software wallet is unable to spend your Bitcoin. To actually spend Bitcoin from the wallet, you will need to load a Partially Signed Bitcoin Transaction file onto the MicroSD and "sign" it using your Coldcard.
Please follow the directions below (also can be found here in our quickstart guide)
Your coldcard should have arrived sealed in a very special bag: It has a large Coinkite logo, green text, a blue border, and a barcode with the number underneath. This number is important and we call it the "bag number". Please make note of this number because the Coinkite factory has recorded this number into the secure area of flash memory inside your Coldcard.
Before opening the bag, please inspect the bag for damage or signs of being previously opened. After you pull apart the top seal, it will show the word "VOID".
The purpose of the bag, and its unique number, is to give you confidence that the Coldcard has come directly from the factory and has not been modified by anyone before you get started.
If you find anything out of place, please contact [email protected] with photos.
This is merely one of many layers of security, and we know that plastic bags can be "hacked" with sharp knives and so on. This is an example of "Defense in Depth".
Tamper Evident Bag (V2)
A serialized tear off tab of the bag is included inside. You should use this tab to double check the width of the bag. You can also use a magnifying glass to check the perforations of the tab match the bag. It is important to observe the bottom of the bag is seamless.
Connect a power supply to the Coldcard using the USB port at the top. Any Micro USB cable you already have can be used. You can connect the USB to a computer, but at this stage, a wall charger or USB power pack could also be used. It just needs power, not data.
Terms of Sale
The first screen you will see looks like this:
If you look closely at the right edge of the screen, there is a small scroll bar and arrow pointing downwards. Use the 5 and 8 keys to move up and down and see the full message.
The complete terms document can be found here. Press the OK key (checkmark, lower right) to accept the terms and continue.
Before a Bitcoin seedphrase is generated, you must select a primary PIN. This is your main defence against random people using your Coldcard when you are not around. Please pick good PIN codes!
On the Coldcard, the PIN consists of two parts, like these examples:
12-34 1234-5678 872323-39843 12-345678
The first part is called the prefix (1234-) and the second, the suffix (-4567). Each part must have between 2 and 6 digits. The prefix determines the anti-phishing words you will see each time you login.
When you pick your PIN code, you'll see the anti-phishing words associated with the PIN prefix. These words will be unique for each Coldcard. You may want to experiment with a few different PIN prefixes until you find some fun or memorable words. Regardless, you will need to remember those words, as it's important to verify those words before proceeding to the second part of the PIN—every time you login to the Coldcard.
As usual, you will be asked to confirm the new PIN and enter it a second time.
New Wallet Once your PIN has been established, it's time to setup your wallet. You should see a menu like this:
Choose "New Wallet" to generate 24 words using the BIP-39 word list.
The words are then shown to you. Write down the seed words, in order, on the provided card or some other paper. Please be careful at this stage and make 100% certain that each word is recorded correctly. You might want to duplicate them by hand at this point too (ie. make a backup copy).
Once you've written the words down, press OK to continue to the quiz. The Coldcard will ask you what each word is, in random order. We do this to verify your backup copy is correct. If at any point you are unsure of a word, you may see them again by pressing OK.
If you complete the quiz successfully, the words are saved, your new Coldcard is ready to be used.
Once your PIN code and master seed have been established, your Coldcard is ready for daily operation.
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