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 chip. Your private key is stored in a dedicated security chip, 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.
Coldcard provides an optional "duress PIN code". If you enter 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 now 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.
The Coldcard (MK3) uses Microchip's ATECC608A to store the critical master secret: the 24-word seed phrase for your BIP32/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 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.
The secure element 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 (MK3) is ₹12,999 including all taxes & free shipping.
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