Coinkite has officially launched the Coldcard MK5, a significant quality-of-life and user experience upgrade to its flagship Bitcoin-only hardware wallet. The new device, announced by company co-founder NVK, retails for $169.94 USD and marks the first hardware upgrade to the MK line since the launch of the MK4 in 2022. While preserving the security foundations of its predecessor, the MK5 integrates a 1.54-inch OLED display protected by Gorilla Glass and a redesigned chassis for improved durability.
The release represents a focused effort by the Toronto-headquartered manufacturer to modernize the device’s physical interface. Building on the established MK4 platform, the MK5 utilizes two secure element chips from different manufacturers: Microchip’s ATECC608 and Maxim’s DS28C36B. This internal configuration remains protected by a new rectangular chassis with curved edges, departing from previous designs where the screen section popped out above the keyboard. These aesthetic shifts come as investor sentiment shifts toward long-term self-custody solutions.
Practical improvements extend to the physical buttons, which are now nearly flush with the device chassis rather than indented. This design provides tactile feedback that is more responsive than standard touch screens used in other wallets. The MK5 also incorporates technologies debuted by the Coldcard Q in 2023, specifically enhancing Near Field Communication (NFC) capabilities. This allows users to engage in “tap-to-send” features and push transactions, providing a simpler alternative to swapping MicroSD cards back and forth.
Advanced NFC capabilities and hardware security
Coinkite has doubled down on NFC support with the MK5, utilizing a short-range antenna that only operates within a range of centimeters. This design choice addresses concerns associated with longer-range wireless technologies like Bluetooth or Wi-Fi, which can span tens of meters. By requiring physical proximity for transmission, the MK5 mitigates the risk of remote connection attempts. As macro warning signs continue to affect broader markets, the focus remains on localized, high-security hardware for asset protection.
For users who prefer to maintain a strict air-gap, the NFC functionality is set to “off” by default. Coinkite also provides a hardware-level option to permanently disable the antenna by scratching a specific wire within the device. The software side of the NFC push transaction protocol is open source, allowing for integration into various web applications, though the hardware side remains under a non-commercial use license.
Connectivity is handled through a relocated USB port at the bottom of the device, which facilitates power and data transmission (65mA at 5 volts). The wallet also supports a USB virtual disk mode that emulates a 4MB disk for firmware management. Since Bitcoin exposure through ETFs has increased institutional interest, the need for verifiable, air-gapped hardware remains a priority for the Bitcoin-only community.
Supply chain verification and physical specifications
The MK5 arrives in a heavy-duty, tamper-proof security bag marked with a unique identification number. This number is set in the device’s flash memory at the factory. When a user first powers on the device, the matching number is displayed on the screen, serving as a verification step to ensure the hardware was not intercepted during shipping. Each box also includes a purchase order to verify that all items are present and accounted for.
Technical specifications and hardware dimensions
- Display: 1.54-inch OLED, 128 x 64 px resolution
- Protection: Gorilla Glass screen cover
- Dimensions: 86 x 50 x 9 mm (cover off) / 87 x 52 x 10.3 mm (cover on)
- Weight: Approximately 55 grams
- Storage: Emulates 4MB USB virtual disk
The MK5 runs the exact same firmware image as the MK4, ensuring that older models do not become obsolete and will continue to receive future updates. This consistency allows Coinkite to maintain a unified software environment while providing users with the physical benefits of the new chassis and buttons. The device remains exclusively Bitcoin-only, supporting both Mainnet and Testnet, which limits the potential attack surface compared to multi-asset wallets.
Style options and collectible varieties
Catering to the collector market within the Bitcoin industry, Coinkite is offering the MK5 in a wide range of colors and styles. These include “Orange,” “Glow-in-the-dark,” “Gold Flakes,” and “Clear” cases. The transparent design of these cases is a signature of the brand, allowing users to visually inspect the internal hardware components for any signs of physical tampering or added circuitry.
While the standalone unit retails for $169.94, Coinkite offers various bundles, such as the “Office Bundle Q” for $919.99, which combines the MK5 with the Coldcard Q and a Tapsigner. These packages are available through the official store at store.coinkite.com. Notably, a USB-C cable is not included with the MK5, requiring users to provide their own compatible power and data connections.
NVK, co-founder of Coinkite, noted that the MK5 represents a “reimagining of the user experience” that is more intuitive while preserving security. By focusing on mechanical work and screen visibility, the company aims to address long-standing user requests for better ergonomics. As self-custody becomes more prominent, the MK5 serves as a refined entry point for users seeking a balance between functional durability and the high-security standards of the Coldcard line.