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 Duo
Stainless Steel Password & Seed Phrase Storage Solution
The Cryptosteel Capsule Duo contains two capsules and a double set of steel character tiles that can be used to store your password or seed phrase. A double set of stainless steel capsules increase your security by adding a redundancy option. One Capsule can store a seed phrase or password composed of 24 words abbreviated to the first 4 letters.
Shipping
Include in the Box
SpecificationsShipping- Free shipping from 180$
- Secure and fast shipping within the USA
- Most shipments reach customers within 2 days!
- Shipped via UPS, DHL or USPS for Reliable Service.
- No customs issues within the USA!
Include in the Box- 1340 tiles
- 2 capsule
- 48 separators
- 8 fasteners
- Packaging for storage
- Instructions
- Cryptosteel privacy guide
SpecificationsCapsule one of two:
- Weight: 90 g / 0,2 lb
- Dimensions 120 x D16 mm / 4,72 x 0,63 in
Package:
- Weight: 740 g / 1.6 lb
- Dimensions: 253 x 181 x 25 mm / 10 x 7,1 x 1 in
Cryptosteel Capsule Duo
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
store your mnemonic seed 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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Orginal desing since 2013
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Customer Reviews
- 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.
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
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
FAQ
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.
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.
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.
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.
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