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Product description

COLDCARD is the most trusted and secure Bitcoin Hardware Wallet.

Introducing

The Coldcard (MK4)

Numeric Keypad

Full-sized numeric keypad makes entering PIN easy and quick.

Bright Screen

Bright, 128x64 pixel OLED screen. Shows all the critical details of your transactions.

Made in Canada

Lovingly soldered in Toronto, Canada. Secure supply chain verified with: tamper-evident numbered bag, with bag number recorded into device.

It's Ultrasecure

Real crypto security chips. Your private key is stored in dedicated security chips, not the main micro's flash.

Easy Back-up

MicroSD card slot for backup and data storage. This allows truly offline signing, by transferring the unsigned/signed transactions on sneakernet.

Connectivity

Different ways to connect

USB-C Connector

The industry-standard for transmitting both data and power over a single cable.

AirGap SneakerNET

Maximum security when when transferring data between devices

NFC Tap

Secure & very short-range wireless transmission that sends data to your phone easily

Virtual Disk

MK4 can emulate a USB disk drive, so sending PSBT files can be a drag-n-drop.

Pin Games

Duress wallet features

Duress PIN

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!

Countdown to Brick PIN

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.

BIP39 Passphrases (25th word)

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.

Built-in Security

Most trusted and secured hardware wallet

Dual Secure Element for Key Storage

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.

Genuine vs. Caution Lights

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.

Anti-phishing words

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.

Physical Security

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

Getting an uncompromised product into your hands

Bag number

First and foremost, we use a tamper-evident plastic bag to package the product. Each bag is unique and coded with a number.

Epoxy globs of love

We cover the secure element, and other sensitive parts of the Coldcard with epoxy.

Clear case

The clear plastic case on Coldcard is an important feature as well.

HODL & Stack

Crypto hardware wallets

Secure your crypto with a hardware wallet and take full control of your assets.

Common questions about Coldcard (MK4)

Why should I buy Coldcard (MK4) from Etherbit?

Etherbit is operating in India since 2017 and is trusted by your favourites: Polygon, Zebpay, WazirX, CoinSwitch Kuber, and more!

Should you have any queries, you can reach out to Coldcard via;

What is the price of Coldcard (MK4) in India?

Price of Coldcard (MK4) is ₹16,999 including all taxes & free shipping.

Where & how to buy Coldcard (MK4) in India?

Buy Coldcard (MK4) from Etherbit with free shipping. Etherbit.in accepts payment via UPI, Google Pay, Amazon Pay, Credit Card, Debit Card, Net Banking, Paytm, and even Bitcoin & Ether.