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Cryptosteel
Headquartered in United KingdomCryptosteel is one of the original metal seed backup brands, having launched the Cryptosteel Cassette in 2015 as an early standard for storing Bitcoin seed phrases on steel. Its products include the cylindrical Cryptosteel Capsule and the Cryptosteel Cassette, both made from AISI 303/304 stainless steel and assembled with letter tiles to store a 24-word seed abbreviated to four letters per word. The devices are designed to withstand fire, corrosion and physical damage for long-term offline storage.
Every spec, organized
Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.
Which methods of payments you can use to buy the device on the official website
- BTC On Chain
YES (via BTCPay)
Accepts Bitcoin payments via on-chain transactions.
- BTC Lightning
YES (via BTCPay)
Accepts Bitcoin payments via the Lightning Network for faster and cheaper transactions.
- Alt Coins
YES (via BTCPay)
Accepts payments in alternative cryptocurrencies other than Bitcoin.
- Credit/Debit Card
YES
Accepts traditional credit and debit card payments.
- Weight
6 oz 171 g
- Dimensions
3.7 × 2.6 × 0.7 in 95 × 66 × 18 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
Space-grade steel
- Include All Tools
YES
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
YES
Resistant to high temperatures and fire damage, protecting your seed phrase in case of fire.
- Crush-proof
YES
Resistant to physical crushing and compression forces.
- Corrosion-proof
YES
Resistant to corrosion from chemicals, salt water, and environmental factors.
- Shock-proof
YES
Resistant to impact and shock damage from drops or physical trauma.
- Stress tests
?
Has undergone rigorous stress testing to verify durability claims.
- 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
YES
Features tamper-evident sealing to detect if the backup has been compromised.
Official Documentation
The PSW-97® tamper-proof seal prevents unauthorized access to your capsule. It's designed to be impossible to open without breaking, ensuring any tampering is immediately visible. The PSW-97® Security Seal by American Casting & Manufacturing Corp. locks easily without tools and has a breaking strength of nearly 45 kg (100 lbs). Its clear tamper evidence and durability are trusted by private, military, and government entities. Each seal includes a unique serial number for easier management of multiple metal backups.
- Multiple Private Keys
NO
Supports storing multiple seed phrases or private keys in a single device.
- 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
NO
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
Number Tiles sold separately
Supports backing up hexadecimal strings.
- ASCII Strings
YES (up to 64 chars)
Supports backing up ASCII text strings.
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Compare the Seed12 Security Kit with the other 43 Seed Backup
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