Summary
Everything this seed backup solution supports, grouped by category.
Vulcan 21 makes STEELQR, a free and open-source metal seed backup made from military-grade 316L stainless steel for securing 12 or 24-word Bitcoin seed phrases. The seed is encoded as a QR code using a SeedSigner device and stamped onto the steel with a center punch, and the product is released under the GPLv3 license. The company offers C12 and C24 variants plus onboarding cards, donating a share of profits to SeedSigner development.
Every spec, organized
Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.
Payment Methods to buy the device
Which methods of payments you can use to buy the device on the official website
BTC On Chain
YES
Accepts Bitcoin payments via on-chain transactions.
BTC Lightning
NO
Accepts Bitcoin payments via the Lightning Network for faster and cheaper transactions.
Alt Coins
NO
Accepts payments in alternative cryptocurrencies other than Bitcoin.
Credit/Debit Card
YES
Accepts traditional credit and debit card payments.
Size & Materials
Weight
50g / 1.76oz
Dimensions
56 x 56 x 3 mm
Length x Width x Height
- Length: the longest side of the device
- Width: the shorter side of the device
- Height: the vertical dimension of the device
Materials
Stainless Steel
Official Documentation
V4A STAINLESS STEEL 316L (1.4404)
Include All Tools
Center Punch tool required
Whether all necessary tools for setup and engraving are included in the package.
Water-proof
YES
Resistant to water damage and can withstand flooding or water exposure.
Fire-proof
?
Resistant to high temperatures and fire damage, protecting your seed phrase in case of fire.
Crush-proof
?
Resistant to physical crushing and compression forces.
Corrosion-proof
?
Resistant to corrosion from chemicals, salt water, and environmental factors.
Shock-proof
?
Resistant to impact and shock damage from drops or physical trauma.
Stress tests
?
Has undergone rigorous stress testing to verify durability claims.
Security
PIN Protection
NO
Offers PIN-based access control to protect your seed phrase from unauthorized access.
Encrypted Backup
NO
Supports encrypted storage of your seed phrase for additional security.
Tamper Evident Seal
NO
Features tamper-evident sealing to detect if the backup has been compromised.
Capacity
Multiple Private Keys
NO
Supports storing multiple seed phrases or private keys in a single device.
Backup Compatibility
Output Descriptor
NO
Supports backing up wallet output descriptors that define how to generate addresses and spend funds.
12 Words BIP-39
YES
Supports backing up 12-word BIP-39 seed phrases.
24 Words BIP-39
YES
Supports backing up 24-word BIP-39 seed phrases.
Seed QR
NO
Supports backing up seed phrases encoded as QR codes.
Shamir Backup SLIP-39
NO
Supports backing up Shamir's Secret Sharing scheme (SLIP-39).
Hexadecimal Strings
NO
Supports backing up hexadecimal strings.
ASCII Strings
NO
Supports backing up ASCII text strings.
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