Cryptosteel Capsule Solo

Stainless Steel Password & Seed Phrase Storage Solution

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

 

$99

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Cryptosteel Capsule Solo

$99

$99

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.

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 hardware and software wallets

Works with all wallets

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

compatible with all apps

All apps compatible

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

supported coins such as bitcoin, etherum, or dogecoin

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

Store 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.

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cryptosteel capsule use case examples
  1. Representative example:
    Random ASCII string
    yb&;A@Hj3)s53p~z>?Kx`Z>3*s
    -#8rTL=R.wA/$>0%Aw99)+?/BTc

2. Representative example:
Full length mnemonic seed
witch collapse practice feed
shame open despair creek
road again ice least

3. Representative example:
Abbreviated mnemonic seed
wolf hind sigh jagg yeti tige
obje avat juve iden degr abla
othe moha tira feve high week
ligh nann anyb boxe etiq weir tige

High Flexibility

The capsule features adjustable separators and offers more capacity—123 characters instead of the 96 most other solutions provide—making it an ideal choice for password and seed phrase storage. It 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.

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.

Cryptosteel Capsule Tiles
Cryptosteel Capsule Duo

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 storage 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 Backup

CRYPTOSTEEL® CAPSULE

CRYPTOSTEEL® CASSETTE

METAL STAMPING

ENGRAVING

Setup time

fast

slow

slow

medium

Reusability / Corrections

easy

easy

impossible

impossible

Readability

excellent

excellent

good

user-dependent

Random ASCII string

supported

not supported

supported

impossible

Risk of injury

very low

very low

medium

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

Customer Reviews

Rated 5 out of 5
Great Concept. The quality of the product itself was outstanding, came with an entire set of characters to use for any kind of password/s you may want to protect. There was even a poster explaining different levels of information security/protection…
Kevin M. (ledger.com)
Rated 4.5 out of 5
Love it!
Chris W. (ledger.com)
Rated 5 out of 5
I've always been a fan of Cryptosteel products. However, this slim and indestructible "tube" is the hit. I can only recommend.
CoinKing (copiaro.de)
Rated 5 out of 5
Love my new Cryptosteel Capsule. It has given me more confidence in the way I’m managing my account/password and physical asset investment securities.
Filo S. (ledger.com)
Rated 5 out of 5
Great Concept. The quality of the product itself was outstanding, came with an entire set of characters to use for any kind of password/s you may want to protect. There was even a poster explaining different levels of information security/protection…
Kevin M. (ledger.com)
Rated 4.5 out of 5
Love it!
Chris W. (ledger.com)
Rated 5 out of 5
I've always been a fan of Cryptosteel products. However, this slim and indestructible "tube" is the hit. I can only recommend.
CoinKing (copiaro.de)
Rated 5 out of 5
Love my new Cryptosteel Capsule. It has given me more confidence in the way I’m managing my account/password and physical asset investment securities.
Filo S. (ledger.com)
Rated 5 out of 5
Great Concept. The quality of the product itself was outstanding, came with an entire set of characters to use for any kind of password/s you may want to protect. There was even a poster explaining different levels of information security/protection…
Kevin M. (ledger.com)
Rated 4.5 out of 5
Love it!
Chris W. (ledger.com)

FAQ

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.

Still have questions? Get help from a Cryptosteel expert.

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