Cryptosteel Seed System
The Next Generation Metal Backup
Cryptosteel Seed System
Now Safe, Forever Secure
The new version of the Capsule comes in two sizes:
Seed12 for the 12-word seed phrases or strings up to 64 characters and Seed24 for 24-word mnemonic phrases or strings up to 128 character-long strings. Both lines offer durable, interchangeable components that adapt to user’s evolving security needs.
Seed12 comes fully modular, allowing to customize the backup perfectly to personal needs. Discreet, small and cheap is the perfect solution at the start of the self-custody journey.
Seed24 is available in the full kit option, and offers the features of the Cryptosteel Capsule,
with enhanced usability of the Seed System.
Cryptosteel Seed metal backup system is perfect for safeguarding software, hardware, and Lightning wallets, as well as passphrases, master passwords, Multisig setups, and Shamir backup shares. The Only Purchase You Need for Lifetime Security.
Built to last
Made from space-grade steel with precision manufacturing and top-quality craftsmanship, the Cryptosteel Seed Metal Backup System is highly resistant to fire, water, and corrosion and can withstand the harshest conditions, ensuring your critical data stays secure no matter what.
Heat-Tested. Disaster-Proven.
From house fires to industrial temps - Seed Metal Backup is fireproof up to 1400°C / 2500°F.
Defying Destruction.
Cryptosteel Seed outlasts the toughest challenges, from heavy impacts to catastrophic drops.
Ultimate Toughness.
Engineered to resist immense pressure, Seed Backup Core stays intact when others fail.
Built to last
Made from space-grade steel with precision manufacturing and top-quality craftsmanship, the Cryptosteel Seed Metal Backup System is highly resistant to fire, water, and corrosion and can withstand the harshest conditions, ensuring your critical data stays secure no matter what.
Disaster-Proven.
From house fires to industrial temps — Seed Metal Backup is fireproof up to 1400°C / 2500°F.
Defying Destruction.
Cryptosteel Seed outlasts the toughest challenges, from heavy impacts to catastrophic drops.
Ultimate Toughness.
Engineered to resist immense pressure, Seed Backup Core stays intact when others fail.
Protect All Your Keys and Passwords.
Seed phrases and passwords are the bread and butter of today’s digital world, from SingleSig, to Multisig and Passphrases to Shamir Secret – Cryptosteel is the common link. Regardless of which platform you’re on – Coinbase, Trezor, Ledger, or Blockstream we help protect your seed with the same unwavering level of security. Cryptosteel is more than the standard for offline seed phrase storage – it’s a symbol of equality in the world of crypto. Your data, your passwords, and any information that’s important to you will find a safe home in Cryptosteel.
Standardised letter tiles vs other solution
Our aim is to standardise the offline backup creation process. You don’t need to think or worry about buying parts from untrusted sources or special additional tools – we provide a solution that is ready right out of the box. You don’t have to learn the hard way how painful, messy and noisy engraving or punching in stainless steel can be – no specific knowledge or safety equipment is needed. Simply open the pack and get started – everything you need is right there. All our products are also correctable. Thanks to our tiles system, you can correct your mistakes, during backup creation process.
We use a classic, easy to read font that will be legible 10 or 1000 years from now. DIY engravings will naturally differ from person to person. Over time, you (or your heirs) may not be able to retrieve the information from a hand made backup due to style, ambiguity, or decay. Using standardised pre-produced character tiles, you can change, undo, or redo the data you wish to be guarded. Should you make any errors, you can easily correct them.
Evolution of the Capsule
Cryptosteel Seed anatomy originates from the pioneering Cryptosteel Capsule – a milestone in the history of metal backups. It enhances the user experience with upgraded components and improved usability while retaining a modular design. Additionally, it offers the option for tamper-evident protection, marking a significant evolution in secure backup solutions.
Backup Core
The centerpiece of security
Shell Capsule
Seal it. Hide it. Protect it.
The Shell Capsule is a high-grade protective container, crafted from a single block of aerograde stainless steel for maximum strength and resilience. Its one-piece body and long-threaded screw cap provide exceptional resistance to deformation and ensure a tight, hermetic seal that protects your backup from moisture, dust, and impact.
The capsule’s exterior features a finely grooved texture that prevents it from slipping in your hand and helps reduce visible fingerprints, making it easier to handle and harder to trace.
A new functional upgrade includes mounting holes on both ends, allowing the installation of tamper-evident security seals for added peace of mind.
Shell Capsules are fully interchangeable and available in five different colors, giving you the flexibility to organize, distinguish, or conceal your backups according to your needs.
Security Seals
Tamper-evidence you can trust
To add an extra layer of physical security to your backup, the Seed System includes one of the most reliable tamper-evident solutions on the market: the PSW-97 security seal by American Casting & Manufacturing Corp.
These industrial-grade seals feature a unique serial number for easy backup identification and management. Built with a secure composite wire and a durable, transparent body, they allow any attempt at tampering to be clearly visible.
Each seal offers a breaking strength of nearly 45 kg (100 lbs), making unauthorized access both difficult and immediately noticeable.
Security seals can be installed through the mounting holes located at both ends of the Shell Capsule. Once in place, they provide irreversible evidence of any intrusion attempt—ensuring that your backup stays untouched and that you stay in control.
The PSW-97 seals are compatible not only with the Seed System (Seed12 and Seed24), but also with the original Cryptosteel Cassette, making them a reliable security upgrade for both new and legacy backups.
Character Tiles
Flexibility for any password
Backup Core
The centerpiece of security
The Seed System Backup Core is the simplest yet fully functional unit for backing up your seed phrase, private key, or password. Made entirely from aerograde stainless steel, it is built to withstand extreme conditions while ensuring long-term durability.
At the heart of the system is a flexible, deformation-resistant steel core
designed to hold character tiles securely in place. The backup process is as intuitive as threading beads - no tools required.
To lock your data, the core uses a foolproof, double-sided cotter-pin,
engineered for maximum reliability. It resists up to 50 kg (110 lbs) of tearing
force, ensuring that your password remains securely fastened at all times.
Despite its minimalist design, the Backup Core offers full protection against fire, water, corrosion, physical destruction, and cyber threats. Now it's up to you to keep it out of sight and out of reach.
Shell Capsule
Seal it. Hide it. Protect it.
The Shell Capsule is a high-grade protective container, crafted from a solid steel rod for maximum strength and resilience.
Its one-piece body and threaded screw cap provide exceptional resistance to deformation and ensure a tight, hermetic seal that protects your backup from moisture, dust, and impact.
The capsule's exterior features a finely grooved texture that prevents
it from slipping in your hand and helps reduce visible fingerprints,
making it easier to handle and harder to trace.
A new functional upgrade includes mounting holes on both ends, allowing
the installation of tamper-evident security seals for added peace of mind.
Shell Capsules are fully interchangeable and available in five different
colors, giving you the flexibility to organize, distinguish, or conceal
your backups according to your needs.
Security Seals
Tamper-evidence you can trust
To add an extra layer of physical security to your backup, the Seed System includes one of the most reliable tamper-evident solutions on the market:
the PSW-97 security seal by American Casting & Manufacturing Corp.
These industrial-grade seals feature a unique serial number for easy backup identification and management. Built with a secure composite wire and a durable, transparent body, they allow any attempt at tampering to be clearly visible.
Each seal offers a breaking strength of nearly 45 kg (100 lbs), making unauthorized access both difficult and immediately noticeable.
Security seals can be installed through the mounting holes located at both
ends of the Shell Capsule. Once in place, they provide irreversible evidence
of any intrusion attempt - ensuring that your backup stays untouched and
that you stay in control.
The PSW-97 seals are compatible not only with the Seed System (Seed12
and Seed24), but also with the original Cryptosteel Cassette, making them
a reliable security upgrade for both new and legacy backups.
Character Tiles
Flexibility for any password
The Seed System lets you tailor your backup to the exact type of secret you
want to store. Depending on your needs, you can purchase a full ASCII character set or opt for dedicated packs of numbers or symbols only.
Each tile is made of aerograde stainless steel and precision-stamped using a hydraulic press to ensure consistent depth, legibility, and long-term durability. The tiles are perfectly flat, with deeply embossed characters that resist wear, corrosion, and deformation over time - even under extreme conditions.
All key components - character tiles, separators, and cotter-pins—are fully compatible across Seed12, Seed24, and the original Cryptosteel Capsule.
This cross-compatibility gives you the freedom to mix and match parts,
extend your setup, or reuse what you already have.
If you have leftover letters from previous kits, you can simply purchase an additional core to create a new backup - no need to buy a complete set.
The modular design supports efficient expansion, customization, and cost-effective upgrades without compromising on security.
Backup Core
The centerpiece of security
The Seed System Backup Core is the simplest yet fully functional unit for backing up your seed phrase, private key, or password. Made entirely from aerograde stainless steel, it is built to withstand extreme conditions while ensuring long-term durability.
At the heart of the system is a flexible, deformation-resistant steel core designed to hold character tiles securely in place. The backup process is as intuitive as threading beads—no tools required.
To lock your data, the core uses a foolproof, double-sided cotter-pin, engineered for maximum reliability. It resists up to 50 kg (110 lbs) of tearing force, ensuring that your password remains securely fastened at all times.
Despite its minimalist design, the Backup Core offers full protection against fire, water, corrosion, physical destruction, and cyber threats. Now it’s up to you to keep it out of sight and out of reach.
Shell Capsule
Seal it. Hide it. Protect it.
The Shell Capsule is a high-grade protective container, crafted from a single block of aerograde stainless steel for maximum strength and resilience. Its one-piece body and long-threaded screw cap provide exceptional resistance to deformation and ensure a tight, hermetic seal that protects your backup from moisture, dust, and impact.
The capsule’s exterior features a finely grooved texture that prevents it from slipping in your hand and helps reduce visible fingerprints, making it easier to handle and harder to trace.
A new functional upgrade includes mounting holes on both ends, allowing the installation of tamper-evident security seals for added peace of mind.
Shell Capsules are fully interchangeable and available in five different colors, giving you the flexibility to organize, distinguish, or conceal your backups according to your needs.
Security Seals
Tamper-evidence you can trust
To add an extra layer of physical security to your backup, the Seed System includes one of the most reliable tamper-evident solutions on the market: the PSW-97 security seal by American Casting & Manufacturing Corp.
These industrial-grade seals feature a unique serial number for easy backup identification and management. Built with a secure composite wire and a durable, transparent body, they allow any attempt at tampering to be clearly visible.
Each seal offers a breaking strength of nearly 45 kg (100 lbs), making unauthorized access both difficult and immediately noticeable.
Security seals can be installed through the mounting holes located at both ends of the Shell Capsule. Once in place, they provide irreversible evidence of any intrusion attempt—ensuring that your backup stays untouched and that you stay in control.
The PSW-97 seals are compatible not only with the Seed System (Seed12 and Seed24), but also with the original Cryptosteel Cassette, making them a reliable security upgrade for both new and legacy backups.
Character Tiles
Flexibility for any password
The Seed System lets you tailor your backup to the exact type of secret you want to store. Depending on your needs, you can purchase a full ASCII character set or opt for dedicated packs of numbers or symbols only.
Each tile is made of aerograde stainless steel and precision-stamped using a hydraulic press to ensure consistent depth, legibility, and long-term durability. The tiles are perfectly flat, with deeply embossed characters that resist wear, corrosion, and deformation over time—even under extreme conditions.
All key components—character tiles, separators, and cotter-pins—are fully compatible across Seed12, Seed24, and the original Cryptosteel Capsule. This cross-compatibility gives you the freedom to mix and match parts, extend your setup, or reuse what you already have.
If you have leftover letters from previous kits, you can simply purchase an additional core to create a new backup—no need to buy a complete set. The modular design supports efficient expansion, customization, and cost-effective upgrades without compromising on security.
Seed12 or Seed24?
Stores 12-word seed phrases or alphanumeric strings up to 64 characters
Compact and discreet
- easy to hide or travel with
Optimized for mobile wallets,
Lightning apps, and basic self-custody
Modular and affordable - discreet packaging, perfect for lightweight setups and gradual upgrades
Features redesigned separators and cotter-pins for improved handling and security
Compatible with all Seed System and original Capsule components
Capsule shell, numbers, symbols, and tamper-evident seals are optional
Possible use of different shell colors and modular expansion
Stores 24-word seed phrases, Shamir (SLIP39), MultiSig, and strings up to 128 characters
Larger capacity - ideal for long-term, high-security setups
Tailored for advanced setups like Multisig, Shamir backup, and secure cold storage
Modular and complete - full functionality in one box for all backup types
Features redesigned separators and cotter-pins for improved handling and security
Compatible with all Seed System and original Capsule components
Comes as a complete set with all ASCII character tiles, capsule shell and 4 tamper-evident seals
Possible use of different shell colors and modular expansion
Tailor Your Seed Security
Select the Modules of the Seed12 /Seed24 System
Seed12 Parts
The Seed12 system is modular by design. We’ve embraced minimalism in both form and pricing, allowing you to buy only the parts you actually need. You can now tailor your backup to precisely match your needs, ensuring you get the best solution.
Seed24 Parts
Seed24 is modular by design, letting you choose only the components you need and avoid unnecessary extras. Simply pick the modules that match your specific requirements.
FAQ
What’s the difference between Seed12 and Seed24 capsules?
What’s the difference between Seed12 and Seed24 capsules?
The main differences between the Seed12 and Seed24 capsules lie in their capacity and size, tailored to meet varying security needs:
- Seed12 is designed to store up to 12-word seed phrases and alphanumeric strings up to 64 characters. It’s smaller and ideal for those starting with secure backups.
- Seed24 can accommodate 24-word recovery phrases and alphanumeric strings up to 128 characters, suitable for more extensive security requirements.
Both models are part of the same modular system, ensuring that all functional components such as cotter-pins, separators, and character tiles are interchangeable and can be used in either device. This compatibility adds flexibility, allowing you to tailor the system to your specific needs over time. Essentially, the difference is primarily in the size and capacity of the backup each model supports.
Are the components (letter tiles, fasteners) the same for both Seed System products, regardless of capsule size?
Are the components (letter tiles, fasteners) the same for both Seed System products, regardless of capsule size?
Yes, the components such as letter tiles and fasteners (now redesigned as foolproof cotter-pins) are the same for both the Seed12 and Seed24 capsules. This compatibility across both sizes ensures flexibility and convenience in managing or upgrading customer’s backup systems.
What other passwords and secrets is Seed12 & Seed24 capsules suitable for?
What other passwords and secrets is Seed12 & Seed24 capsules suitable for?
Both Seed12 and Seed24 capsules are ideal for securely storing a wide range of sensitive data. In addition to 12-word seed phrases, Seed12 can be used for passphrases, private keys, and numerical PINs. It’s perfect for storing login credentials, master passphrases for password managers, NOSTR keys, and other alphanumeric passwords up to 64 characters. Seed24, with its capacity for 24-word seed phrases, expands these capabilities further. It can also accommodate multishare backup solutions like multisignature setups and Shamir’s Secret Sharing shares.
Does Seed12 offer the same level of security as Seed24?
Does Seed12 offer the same level of security as Seed24?
Yes, the Seed12 offers the same level of security as the Seed24 in terms of the materials used and the design features. Both models are designed to protect against physical damage, tampering, and natural disasters. The main difference lies in their capacity: Seed12 is designed for 12-word phrases, while Seed24 can accommodate 24-word phrases, offering more storage for those who need it.
Can I store a 12-word seed in a Seed24?
Can I store a 12-word seed in a Seed24?
In the Seed24, you can store a 12-word seed phrase even in its full, unabbreviated form, although the first four letters of each word are always enough for secure wallet restoration.This extra capacity offers additional peace of mind, although it’s not required for effective recovery.
How is Capsule Solo different from Seed12 and Seed24 capsules?
How is Capsule Solo different from Seed12 and Seed24 capsules?
Both the Seed12 and Seed24 are based on the architecture of the Capsule Solo and retain all its properties. However, they offer an enhanced user experience through several improvements:
- the Capsule fasteners are replaced with the foolproof cotter-pins to increase security and ease of use;
- the shape of the separators has been improved for better stability and readability during the restoration process;
- the quality and precision of the character tiles have been enhanced, ensuring clearer visibility;
- the storage core is now separated from the shell, which allows for more versatile storage options;
- the new capsule shell offers the option to install security seals, adding protection against tampering.
All functional elements are interchangeable between the Capsule, Seed12, and Seed24, allowing users to mix and match components as needed for their specific security requirements.
Still have questions? Get help from a Cryptosteel expert.