KruxDIY / stateless signing device

Krux DIY

Name: Krux DIY
Brand: Krux

Krux DIY is a DIY / stateless signing device released in July 2021. Key specs: open-source firmware, air-gapped signing, signing connectivity QR code, microSD, screen size 3.5″.

7.1Score

Security4.0

Open source5.9

Bitcoin features9.2

Ease of use7.8

Connectivity7.8

price range€45–60Reference price converted from USD

Full specifications

Released: July 2021
Type: DIY / stateless signing device
Brand: Krux
Popularity: #27 of 141
Model numbers: Krux DIY Hardware Wallet

NoSecure Element chip

YesOpen-source firmware

YesAir-gapped signing

QR code, microSDSigning connectivity

3.5″Screen size

YesBuilt-in battery

150 gWeight

Spec guide

How it ranks among DIY signing devices

Spec guide

Screen size · 3.5″Top 19%Weight · 150 gBottom 11%

Compared with every model of this kind in the catalog.

Specifications

Full specifications

Security

Secure Element chip: No
Air-gapped signing: Yes
100% air-gapped: Yes
Supply-chain & tamper protection: Yes
Secure boot: No
Anti-klepto (anti-exfil) signing: No

Firmware & open source

Open-source firmware: Yes
Source code available: Yes
Reproducible builds: Yes
Firmware licence: MIT
Upgradable firmware: Yes
Firmware update via: USB, microSD
Bitcoin-only firmware / edition: Yes

Device lock

PIN lock: Yes
PIN entered on the device: Yes
Fingerprint unlock: No
Duress PIN / decoy wallet: No
Brick / wipe PIN: No
Wipe after failed attempts: No
Time-delayed unlock: No
Anti-phishing words: Yes

Keys & backup

BIP39 passphrase: Yes
Shamir backup (SLIP-39): No
Seed XOR: Yes
BIP85 child seeds: Yes
24-word seed: Yes
SeedQR backup: Yes
microSD backup: Yes
NFC backup card: No
User-added entropy (dice): Yes
Stateless use (no stored keys): Yes
Multiple seeds on one device: No

Bitcoin features

Multisig: Yes
Taproot: Yes
Miniscript: Yes
Message signing: Yes
Coin control: Yes
Own node connection: Yes
Tor support: Yes
Replace-by-fee: Yes
Silent Payments: No
Spending limits: No
Testnet: Yes

Supported assets

Altcoins & tokens: No
Bitcoin only: Yes

Connectivity

Signing connectivity: QR code, microSD
USB: No
USB-C: Yes
Bluetooth: No
NFC: No
QR code camera: Yes
Animated QR (UR): Yes
microSD signing: Yes

Screen & input

Screen: Yes
Screen size: 3.5″
Screen type: TFT
Screen resolution: 320 × 480
Touchscreen: Yes
Colour screen: Yes
Gorilla Glass: No
Controls: Touch Screen
QWERTY keyboard: No

Battery & power

Built-in battery: Yes
Battery capacity: 520 mAh
Removable battery: No
Wireless charging: No

Design

Weight: 150 g
Length: 104.3 mm
Width: 63.3 mm
Thickness: 16.5 mm
Materials: Plastic
Water / dust resistance: No
Several colours available: No
DIY build possible: Yes

Apps

Desktop app: No
Mobile app: No
Works with wallet apps: Bitcoin Safe, Zeus, Nunchuk, Cove, Electrum, Sparrow, Specter Desktop, Blockstream Green, BlueWallet, Bitcoin Keeper, Bull, Liana
Compatible third-party wallets: 12

Other features