Out of Stock
- Supports Bitcoin (BTC)
- Compare with 42 other hardware wallets
- Verifiable Source Code
- Easy-to-use
- Ultra-Secure
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Contact sales for bulk, enterprise, and rate contract purchases
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Product description
COLDCARD (MK4) is the most trusted and secure Bitcoin Hardware Wallet.
Coldcard (MK4) supports Bitcoin (BTC)
Compare Coldcard (MK4) with 42 other hardware wallets
Browse from our portfolio of 27 brands
Introducing
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.
FAQs
What happens if I lose my Coldcard (MK4)?
Losing your Coldcard (MK4) doesn't mean losing your crypto. Your assets are stored on the blockchain, which you can access, manage and retrieve as long as your Secret Recovery Phrase is safe and accessible only to you.
Simply get another hardware wallet and enter your Secret Recovery Phrase to regain access to your digital assets.
See our self-custody guide.
Which coins & NFTs are supported by Coldcard (MK4)?
Do I have to pay import (customs) duty when buying Coldcard (MK4) from Etherbit.us?
No, Coldcard (MK4) is already customs cleared and in Etherbit's warehouses in India. Your order will be dispatched in 24 hours and delivered within 2-5 days with free express shipping. See our shipping policy.
Price shown on Etherbit.us includes everything. It is what you pay to buy Coldcard (MK4) and get it delivered to your doorstep. There are no hidden charges.
How to buy Coldcard (MK4) in the United States?
-
Order from
Etherbit.us
(Coinkite's official partner)
- Only pay what you see on the website
- No import (customs) duty, no hidden charges
- Free Express Shipping with delivery in 2-5 business days
- Option to pay Cash on Delivery, UPI, and more
-
Order from Coinkite's international website
- Pay import (customs) duty + taxes when you take delivery of the product
- International shipping & delivery may take longer
- The US customs may require KYC to clear international shipments
Why should I buy Coldcard (MK4) from Etherbit.us?
Etherbit.us is an official & authorised partner of Coinkite and Coinkite recommends buying from official partners. You can visit Coinkite's official website & verify Etherbit's identity: coinkite.com/resellers
Etherbit.us is operating in India since 2017 and is trusted by your favourites: Polygon, Zebpay, CoinSwitch Kuber, and more!
Should you have any queries, you can reach out to Coinkite via;
- Twitter: @Coinkite
- Support: support@coinkite.com
How to claim warranty of Coldcard (MK4)?
Reach out directly to Coinkite for warranty-related queries about Coldcard (MK4).
Etherbit's warranty claim policy is not applicable to Coldcard (MK4).