Coinkite, a leading manufacturer of Bitcoin-only hardware wallets, has recently unveiled its latest model, the MK5 Coldcard. This new device represents a substantial upgrade over its predecessor, the MK4, particularly in terms of user experience and functionality. Available in various appealing colors and designs, today I will delve into an in-depth review of the Orange and Glow-in-the-Dark versions, focusing on their enhancements and whether the investments in these upgrades are justified.
Significant Enhancements in the MK5 Coldcard
The MK5 retains the robust security architecture of the MK4, which previously integrated two secure element chips from different manufacturers alongside a dedicated MCU. However, the MK5 emphasizes user experience by improving NFC capabilities, redesigning the button layout and chassis, and introducing a larger display, among other features. This is the first major hardware refresh in the Coinkite MK series since the MK4 was launched in 2022, incorporating some aspects from the recently released Coldcard Q.
Visual and Functional Improvements
One of the most striking upgrades in the MK5 is its larger screen—approximately 30% bigger. Coinkite proudly states that it features a “1.54-inch display protected by Gorilla Glass,” offering improved durability compared to older models.
The button design has also seen a beneficial transformation. The MK4’s indented buttons have been replaced with flat, nearly flush buttons on the MK5, allowing for easier interaction. This tactile feedback is a refreshing change compared to the unresponsive touchscreens often found in competing hardware wallets.
Additionally, the MK5 has undergone a chassis redesign. The new screen is now seamlessly integrated, presenting a sleek, modern appearance with comfortable rounded edges. It continues to reflect Coinkite’s commitment to cypherpunk aesthetics by showcasing its internal components.
Another interesting feature is the inclusion of a removable button and screen protector case. This accessory fits snugly against the back of the device, allowing easy access to the USB power input.
Enhanced NFC Transaction Capabilities
The MK5 doubles down on NFC (Near Field Communication) support, positioning itself as a competitive option in the Bitcoin hardware wallet market. NFC technology offers a secure, user-friendly alternative for transactions compared to Bluetooth or Wi-Fi due to its short-range attributes, limiting potential hacking risks.
Since NFC does not require detailed pairing protocols—just a quick tap—its integration is straightforward, making for a smoother user experience. Coinkite’s NFC push transaction software is open source, adding transparency and allowing developers to incorporate it into their applications seamlessly.
Color Choices for the MK5
The MK5 caters to collectors and enthusiasts alike, offering unique designs such as a gold-flaked transparent gray, an eye-catching orange, and a playful glow-in-the-dark version. I’ve had the chance to explore the Orange and Glow versions, each with a distinct appeal, making them not just functional devices but stylish accessories as well.
Supply Chain Integrity
Coinkite takes security seriously right from the packaging phase. The MK5’s box arrived with a detailed purchase order alongside tamper-proof security bags, which are robust enough to require a knife for access. Each item is uniquely numbered, which is crucial for preventing unauthorized adjustments during transit. Upon powering up the device, the same number appears on the screen for verification purposes.
Room for Improvement
While NFC Push Tx integration was commendable, I found that performance varied across different mobile wallets. Nunchuck provided the best experience, while Cove also performed well, though Bull Bitcoin appeared to have disabled the feature. Additionally, having to remove my phone’s thick case for reliable data transmission was a minor inconvenience.
Conclusion: Is the MK5 Upgrade Worth It?
As someone who currently owns an MK3, transitioning to the MK5 is a no-brainer. Priced at $167 plus shipping, the substantial upgrades in security and user experience make it an appealing purchase. For regular users of the MK4, the benefits—including a larger display and improved button functionality—enhance the overall experience. However, for those who rarely use the MK4, the incremental improvements may not justify the upgrade, as they still receive firmware updates and essential security enhancements.
Disclaimer: Coinkite provided Bitcoin Magazine with a couple of free MK5 Coldcards for the purpose of review.
