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COLDCARD is the most trusted and secure Bitcoin Hardware Wallet.
Full-sized numeric keypad makes entering PIN easy and quick.
Bright, 128x64 pixel OLED screen. Shows all the critical details of your transactions.
Lovingly soldered in Toronto, Canada. Secure supply chain verified with: tamper-evident numbered bag, with bag number recorded into device.
Real crypto security chips. Your private key is stored in dedicated security chips, not the main micro's flash.
MicroSD card slot for backup and data storage. This allows truly offline signing, by transferring the unsigned/signed transactions on sneakernet.
The industry-standard for transmitting both data and power over a single cable.
Maximum security when when transferring data between devices
Secure & very short-range wireless transmission that sends data to your phone easily
MK4 can emulate a USB disk drive, so sending PSBT files can be a drag-n-drop.
You may define an optional "duress PIN code". If anyone enters that PIN code, instead of the "real" PIN code, nothing special is shown on the screen and everything operates as normal... However, the bitcoin key generated is not the main key. It is effectively a completely separate wallet!
This is a covert variation of the BRICK ME PIN mode. It forces a time delay (of minutes/hours/days) when logging into the Coldcard.
Coldcard supports BIP39 passphrases so you can also create an unlimited supply of distraction wallets. This feature is also useful for your own organization of funds or accounts. Unlike the single duress PIN, an unlimited number of related wallets can be created using BIP39.
Coldcard (MK4) uses Microchip's ATECC608A and Maxim's DS28C36B, to store the critical master secret: the 24-word seed phrase for your BIP39 wallet.
To resist Evil Maids, and other sneaky people with physical access to your Coldcard, we sign our firmware with a factory key. During boot-up, the firmware's signature, and nearly every byte of flash memory, will be verified and the appropriate Green/Red light set.
The PIN code on Coldcard is divided into two parts, such as 1234-5678. You first enter 1234 and then you will be shown two words on-screen. Those words are unique for all PIN prefixes, and for each Coldcard ever made.
Both secure elements and critical parts of the main micro are covered by epoxy at the factory. Our clear case is part of our security model too, so you can look and see if a "hardware implant" has been inserted inside your device.
Supply Chain Protection
First and foremost, we use a tamper-evident plastic bag to package the product. Each bag is unique and coded with a number.
We cover the secure element, and other sensitive parts of the Coldcard with epoxy.
The clear plastic case on Coldcard is an important feature as well.
Price of Coldcard (MK4) is ₹16,999 including all taxes & free shipping.
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