Cryptosteel Capsule is the premier backup tool for autonomous offline storage of valuable data without any third-party involvement. The solid metal device, designed to survive extreme conditions, works under nearly all circumstances. It is compatible with most secret sharing and key generation algorithms.

Cryptosteel Capsule Solo

Stainless Steel Password & Seed Phrase Storage Solution

4.9

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The Cryptosteel Capsule contains a set of steel character tiles that can be used to store your password or seed phrase in the stainless steel Capsule. One Capsule can store a seed phrase or password composed of 24 words abbreviated to the first 4 letters.

Shipping

Include in the Box

Specifications

Shipping

Include in the Box

Specifications

Product specifications

Capsule dimensions: length 102mm, diameter 16mm

Solid metal construction – 100% stainless steel

Shell made of AISI 303

Core, separators, fasteners and character tiles made of AISI 304

Packaging includes all printable ASCII characters (96 different characters).

Backup type compatibility

100% coverage for:

BIP39 (unabbreviated 12-word recovery seeds or 4-letter abbreviations of 24-word recovery seeds)

Shamir Backup SLIP39 (4-letter abbreviations of 20-word recovery seeds)

BIP32 root keys

WIF private keys

Monero mnemonic seeds (4-letter abbreviations of 25-word recovery seeds)

More than 99% coverage for:

hexadecimal strings up to 123 characters

random ASCII strings up to 55 characters

Coverage based on analysis of more than 3.5M samples.

WORKS WITH ALL WALLETS

Trezor, Ledger, BitBox, Jade, ColdCard, Fundation, and more..

ALL APPS COMPATIBLE

MetaMask, NOSTR, Electrum, Mycelium, Coinbase, and more...

SUPPORTED COINS

Bitcoin, Ethereum, USDT, BNB, Doge, LTC, XMR, and more...

HIGH FLEXIBILITY

supports all printable ASCII characters

IMPROVED SECURITY

passwords are protected, not visible at first glance

ADJUSTABLE SEPARATORS

keep your mnemonic seed phrase in full in 123 characters

HIGH MOBILITY

small, light, easy to hide and protect

TAMPER EVIDENCE

DIY fireproof barrier seal, capsule identification possible

EXTREMELY DURABLE

Fireproof up to 1400C/2500F. Shockproof. Waterproof. Stainless.

Customer Reviews

High Flexibility

The capsule features adjustable separators, offers more capacity – 123 instead of 96 characters most other solutions provide – and comes with a full ASCII-character-set supporting random passwords with numbers and symbols. All of the characters are deeply stamped into the tiles to provide maximum longevity.

This means that the capsule can securely store a random password without separators, an unabbreviated 12-word mnemonic seed, or the first four letters of a mnemonic seed made up of 25 word phrases.

1. The first example shows a random ASCII password stored on the core that is 55 characters long. Considering the unused space, two or more passwords can be stored, split using separators, up to 123 characters long, in total, including WIF, Hexadecimal, and Root Keys.

2. With the second, you can see an unabbreviated 12-word mnemonic seed phrase. With the remaining space at the top, you can store additional data including passwords, passphrases, or random ASCII strings.

3. The third example demonstrates a 25-word abbreviated mnemonic seed phrase. Of course, the aesthetically designed capsule is also able to store 20-word Shamir backups and 24-word recovery seeds in their abbreviated forms.

Standardised letter tiles vs hand-written solution

Our aim is to standardise the offline information protection system and provide a solution right out of the box. You don’t need to think or worry about buying additional materials or special tools. You don’t have to learn the hard way how painful engraving metal can be – no specific knowledge or safety equipment is needed. Simply open the pack and get started – everything you need is right there.

We use a classic, easy to read font that will be legible 10 or 1000 years from now. Hand 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-written backup due to style, ambiguity, or decay. Using standardised tiles, you can change, undo, or redo the data you wish to be guarded. Should you make any errors, you can easily correct them.

Packaging

We designed a sturdy box which is reusable, transparent for easy searching, ergonomic for ease of use, and made from recycled PET. We have ensured the tiles stay separate during transport and storage and that they are easy to take out of their respective compartments.

There is no need to throw away the remaining character tiles because their numbers are partially random – nothing is revealed about the characters used or unused in the device. And as a consequence, the valuable data does not get compromised, and you have all the tiles you need should you decide to change your code.

Shamir Backup Support

The usual approach to protecting digital assets is redundant backups, but when the asset itself is of significant value and high liquidity, there is a substantial risk of a backup custodian absconding with the asset.

The cryptographic secret-sharing scheme created by Adi Shamir is an ingenious way to help protect data.

How Shamir’s secret sharing works?

Shamir’s secret-sharing provides a better mechanism for backing up secrets by distributing custodianship among a number of trusted parties in a manner that can prevent loss even if one or a few of those parties become compromised. The scheme allows you to split your recovery seed phrase backup into multiple independent parts called shares.

You may shield important information using Shamir Backup, which is supported by the Capsule. The master secret that you are protecting might never be compromised even in cases of aggressive acts including but not limited to theft, bribery, vandalism and violence where the knowledge of fewer than the required number of shares is discovered.

Cryptosteel Capsules have been boxed together in different packs keeping in mind the Shamir Backup secret-sharing scheme as implemented by SatoshiLabs in the SLIP39 standard. The sets “TRIO” and “QUINTET” can be used to store a master seed using the 2-of-3 and 3-of-5 schemes respectively. Up to x-of-16.

CRYPTOSTEEL® CAPSULE

CRYPTOSTEEL® CASSETTE

METAL STAMPING

ENGRAVING

Setup time

fast

slow

medium

Reusability / Corrections

easy

impossible

Readability

excellent

good

user-dependent

Random ASCII string

supported

not supported

supported

impossible

Risk of injury

very low

medium

Setup time

Cryptosteel® Capsule
fast

Cryptosteel® Cassette
slow

Meal Stamping
slow

Engraving
medium

Reusability / Corrections

Cryptosteel® Capsule
easy

Cryptosteel® Cassette
easy

Meal Stamping
impossible

Engraving
impossible

Readability

Cryptosteel® Capsule
excellent

Cryptosteel® Cassette
excellent

Meal Stamping
good

Engraving
user-dependent

Random ASCII string

Cryptosteel® Capsule
supported

Cryptosteel® Cassette
not supported

Meal Stamping
expensive

Engraving
supported

Risk of injury

Cryptosteel® Capsule
very low

Cryptosteel® Cassette
very low

Meal Stamping
medium

Engraving
medium

FAQ

Why do I need a metal storage for my seed phrase?

A seed phrase is a critical part of securing your cryptocurrency wallet. It allows you to recover your wallet and access your funds if your device is lost or damaged. Proper storage of your recovery seed is essential to prevent theft, loss, or damage. Using a durable and secure storage solution like Cryptosteel metal backup ensures that your data is protected from physical threats such as fire, water, and corrosion, providing peace of mind and long-term security for your digital assets.

Furthermore, the Cryptosteel Cassette was the first original solution for offline seed phrase storage ever developed on the market and has since been copied by many other producers. This pioneering design set the standard for secure, offline seed storage, conforming to industry protocols like BIP39, ensuring compatibility with most cryptocurrency wallets.

By choosing Cryptosteel, you are investing in a product that offers maximum protection, long-term durability, and a proven track record in safeguarding your digital assets.

Is it safe to take Cryptosteel Capsule through the airport security?

Yes, it is generally safe to take your Cryptosteel through airport security. Cryptosteel products are made of stainless steel and do not contain any electronic components, so they should not trigger any alarms. The Cryptosteel Capsule is particularly safer in this circumstance as the stored information cannot be seen or photographed, even if you are requested to open the device. Be prepared to explain that it is a secure storage device for sensitive information and comply with local security regulations.

How to read your backup on the Cryptosteel Capsule?

To read your backup on the Cryptosteel Capsule:

1. Open the Capsule: Unscrew the top part of the Capsule to access the core where your characters are securely stored.

2. Slide the Tiles: Use the tip of a pencil or any similar tool to carefully slide the tiles on the core one by one. As you slide each tile, read the character and write it down on paper in the proper order to ensure accurate restoration. Do not remove the tiles completely off the core; simply slide them enough to view and record each character.

3. Reassemble the Capsule: After noting down all the characters, reassemble the Capsule by securely screwing the top back on, ensuring that your sensitive data remains protected.

This process allows you to safely access and record your information without compromising its security or the integrity of the tiles.

Which wallets are supported by Cryptosteel Capsule?

The Cryptosteel Capsule is compatible with a wide range of non-custodial wallets, including hardware, software, and Lightning wallets that use BIP39, BIP32, BIP44, and SLIP39 standards.

Supported wallet brands include hardware wallets (Blockstream, Bitbox, Ledger, Trezor, KeepKey, Coldcard, Passport by Foundation), software wallets (Green, Electrum, Exodus, Mycelium, Samourai, Wasabi, Trust Wallet) and Lightning wallets (BlueWallet, Wallet of Satoshi, Phoenix, Zap, Breez).
All of these wallets are non-custodial, meaning you retain full control of your private keys and seed phrases, making them compatible with the Cryptosteel Capsule for securely storing and recovering your sensitive information.

How many words can a Capsule hold?

The Cryptosteel Capsule can hold up to 123 characters. This capacity allows it to store various types of sensitive data, such as:
– A 12-word seed phrase: Storing each word fully or the first four characters of each word.
– A 24-word seed phrase: Storing the first four characters of each word, which is sufficient for BIP39 standard recovery phrases.
– Passwords, private keys, or other sensitive data: Due to its flexibility in holding different characters, including upper and lower case letters, numbers, and symbols.
This makes the Capsule a versatile option for securely storing a wide range of critical information.

Is it possible to change the set seed phrase/password in the Capsule?

Yes, the Capsule is designed to be easily correctable. While it’s impossible to accidentally reset the stored password or seed phrase, you can intentionally erase and update the information whenever needed.

Can I return my product?

Yes, you can return your purchased product for a full refund at any time. Just contact our Support Desk for instructions. We’ll process your refund once we receive the product or tracking number. If the order has already been shipped, we can arrange a return of the unopened package for a full refund.