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SteelSeed Card
€ 4.99
- USD: 5.78$
When it comes to protecting your crypto, peace of mind shouldn’t be a luxury. The SteelSeed Card delivers uncompromising security in a sleek, wallet-sized form. This card serves as a cost-effective replacement for paper backup forms
Made from high-grade stainless steel (85×53mm, 1mm thick), As compact as a credit card, yet built to last. Although it is possible to stamp the SeedQR using a stamping tool, it is not recommended if you want to avoid bending the plate. The 1 mm thickness provides excellent strength for general use and storage, but using a punching tool may cause deformation.
The front features a 25×25 SeedQR grid with alignment marks for clean, accurate marking. Trace over the holes with the included marker for high-contrast, scannable results. For added redundancy, the right side provides space to write or engrave your full seed phrase using standard 4-digit BIP encoding (Full words are possible but space is limited) This gives you both QR and written backup on one plate. The backside features an additional 21×21 QR grid, giving you even more flexibility for your backup strategy. While this grid doesn’t include the helpful alignment marks, it’s perfectly suited to mark your SeedQR in a compact 21×21 grid.
The matte white finish isn’t just aesthetically pleasing, it virtually eliminates light reflections that can interfere with QR code scanning.
Each SteelSeed Card ships with a permanent marker. You get everything you need to secure your backup right away. Compatible with SeedSigner and other hardware wallets that use SeedQR.
Technical Specifications
- Dimensions: 85mm x 53mm (credit card size)
- Thickness: 1mm
- Material: High-quality stainless steel with matte white finish
- Capacity: 25×25 front grid, 21×21 rear grid, 24-word seed phrase area
- Includes: Permanent marker
Availability: 85 in stock
Fire resistant
Rust resistant
Chemical resistance
Compact Design
SeedQR is a standardized method for backing up your BIP39 seed phrase in QR code format. This allows you to store your recovery phrase as a QR code, making it easier to quickly load into compatible devices.
How it works:
Devices like SeedSigner, Blockstream Jade, and other compatible hardware wallets can scan these QR codes to instantly load your recovery phrase without manual entry.
important security considerations:
A SeedQR should be secured with the same level of protection as your written seed phrase, as it contains the same sensitive information.
Anyone who gains access to your SeedQR can potentially access your funds.
Store it securely and treat it like cash
Passphrase handling:
SeedQR stores only your seed phrase without any passphrase
If you use a passphrase, it must be entered separately on the device after scanning the SeedQR
This separation adds an extra layer of security - even if someone finds your QR code, they still need your passphrase
Formats available:
The SeedQR standard offers two encoding options: Standard format (uses word index numbers from the BIP39 wordlist) and CompactSeedQR format for more efficient storage.
Key advantages:
-Enables air-gapped, stateless wallet operation
-Quick wallet access without permanently storing keys on devices
-Reduces manual entry errors
-Compatible with multiple hardware wallet brands
The decision to use SeedQR depends on your specific needs and security setup.
When SeedQR is beneficial:
SeedQR significantly improves the user experience with air-gapped devices like SeedSigner, eliminating the need to manually enter your seed phrase each time you want to access your wallet. This reduces entry errors and makes the process much more convenient for regular use.
Security considerations:
However, using SeedQR requires the same rigorous security practices as your written seed phrase. You'll need to ensure your QR code backup is properly stored and protected from unauthorized access, theft, or damage.
The trade-off:
While SeedQR offers convenience and reduces manual input errors, it also means you have another physical backup to secure alongside your traditional written seed phrase. Some users prefer the simplicity of managing only a written backup, while others appreciate the operational benefits SeedQR provides.
Bottom line:
SeedQR can be a valuable tool if you frequently use air-gapped signing devices and are committed to properly securing the QR code backup. The convenience it offers should never come at the expense of proper security practices. Treat your SeedQR with the same level of protection you would give to your written recovery phrase.
The difference between 21x21 and 25x25 SeedQR codes relates to both the seed phrase length and the encoding format used:
21x21 SeedQR:
-Used for 12-word seed phrases in CompactSeedQR format
-Encodes 128 bits of entropy (16 bytes) using efficient binary encoding
-Smallest possible QR code size for a 12-word recovery phrase
-More compact and easier to physically store or engrave
25x25 SeedQR:
-Used for 24-word seed phrases in CompactSeedQR format
-Encodes 256 bits of entropy (32 bytes) using binary encoding
-Also used for 12-word phrases in Standard SeedQR format (less efficient encoding)
-Larger but still relatively compact
Choose 21x21 for 12-word phrases when you want maximum compactness, or 25x25 for 24-word phrases when you prioritize higher security.
Yes! Any device that uses QR codes to import keys can read these
Please note that XmrSigner is currently still in Beta release and not yet fully functional. SeedSigner OS is fully functional
- Sign transactions via Qr-Code, XmrSigner uses the UR standard to sign off-line transactions, so your seed is never exposed to the Internet.
- Supports Monero Seed 25 words and Polyseed 16 words + passphrase.
- Generate seed from dice rolls, each roll of the die produces a random number, which is then used to create the seed.
- Generate seed from picture, using data from an image via the camera to obtain a random source to create a seed.
- Import seed from QR code, XmrSigner lets you easily inscribe this seed on a qrcode, thanks to the famous "SeedQR" standard.
- Import seeds manually, you can manually import all types of Monero seeds, XmrSigner's incredible UX makes this very easy.
- Generate addresses from accounts
- Generate view-only wallet & export, you can easily export your view-only wallet to online support using CodeQR.
Desktop wallet
- Monero GUI (linux/macos/windows)
- FeatherWallet (linux/macos/windows)
- CakeWallet (linux/macos/windows)
- StackWallet (linux/macos/windows)
Mobile wallet
- CakeWallet (android/ios)
- StackWallet (android/ios)
- Monerujo (android).
Note: if you already own a SeedSigner, XmrSignerOS is perfectly compatible with your device, and the same goes the other way round: if you get an XmrSigner, you can run SeedSignerOs without any extra effort, just as you set up XmrSignerOS.
One of the most innovative aspects of XmrSigner is the use of immutable consumer hardware. Unlike specialized hardware wallets, XmrSigner relies on components whose future use is not predefined at the time of their manufacture. This creates an additional barrier against supply chain attacks, as the hardware is neutral and not specifically designed for a crypto wallet. As a result, any attempt to insert a backdoor during manufacturing becomes extremely complex and unlikely. One of the key elements of XmrSigner is the Raspberry Pi Zero, a general-purpose mini-computer, without a pre-installed operating system and without integrated flash memory. That is, it does not have the ability to permanently store data in its electronic components and works exclusively with a custom external operating system, in our case "XmrSignerOS", loaded from a MicroSD card temporarily in RAM and loses its contents when the device is turned off. Additionally, the Raspberry Pi Zero 1.3 has neither Wi-Fi nor Bluetooth, a truly air-gapped mini-computer, the signature is carried out by an exchange of QrCode via an OV5647 type camera which is also a consumer component whose use is not predefined at the time of their manufacture and which does not have internet connectivity either. Updates are made from the microSD card.
Both Xmrsigner and SeedSigner use the same hardware. However, the key difference lies in the operating system (OS). Xmrsigner is designed to work exclusively with Monero, while SeedSigner only works with Bitcoin. You can use the premium cases for SeedSigner as well.
The enclosure is made from aluminium with a sandblasted and anodized finish and is available in a range of 3 colours (silver/black-orange-gray), you can get it in different configurations: 1) With the electronic components neatly assembled in the box and ready to use 2) In kit form with all the components for do-it-yourself assembly 3) Only the enclosure.
Only the enclosures contains the following items: Body of the case sandblasted and silver anodized aluminium - Top panel sandblasted and anodized aluminium with 3 color (black/orange/gray) - 40 gold plated pin 2x smaller than the original raspberry pi pin - 4 hexagonal head screws with internal tapping (steel) - 4 hexagonal screws (steel) - 1 protective glass for the camera - 1 joystick button silver anodized aluminum - 3 navigation buttons silver anodized aluminum.
The self-assembled kit contains the following items: All the components in the enclosure - 1x raspberry pi zero - 1x waveshare display 240×240 - 1x camera module 5 MP OV5647 - 1x micro SD card - 2m micro USB cable
If you want to get a Signer ready to use, we will carefully assemble it for you.
Note: if you only buy the enclosure, you will not need to use the original raspberry pi zero header, I provide pins to fit the enclosure to reduce the height of the device, find the assembly instructions here or find a video of the assembly here. If you purchase a Signer as a kit or only in enclosure, we are not responsible for any damage you may cause during assembly of the components.
