The ultimate gift set for crypto beginners and experts alike! Includes five Cryptosteel Capsules packed and the Trezor Model T hardware cryptocurrency wallet in an exclusive clamshell box, all made in Europe. The Cryptosteel Capsule is the leading seed phrase backup device protecting against memory device failure, loss or damage by natural elements. Paired with the groundbreaking Shamir’s Secret Sharing (SSS) system and the Model T hardware wallet by our official partner Trezor, the HODL Pack is the definitive seed backup combo!

The Shamir HODL (Hold On for Dear Life) bundle is based on the SSS backup system created by Israeli cryptographer Prof. Adi Shamir, co-inventor of the Rivest–Shamir–Adleman (RSA) algorithm, and one of the inventors of differential cryptanalysis, with numerous contributions to cryptography and computer science.

A set of five Cryptosteel capsules combined in a Shamir HODL pack is the core of the system and the pinnacle of security. The method is based on splitting the seed into multiple parts (aka “shares”). Unlocking the seed requires a defined minimum number of shares (the “threshold”), typically the simple majority of designated shares. The Shamir HODL Pack allows distributed backup on the virtually indestructible Cryptosteel capsules in a robust and practical 3-of-5 configuration securing your seed even if one or two capsules succumb to malicious or chance occurrences. The system ideally complements the Trezor Model T hardware wallet built around the highly praised open-source SLIP39 backup standard. With support for over a thousand coins and tokens, as well as U2F and FIDO2 authenticators, the Cryptosteel Shamir HODL Pack is the ultimate security solution for your digital identity and crypto assets.

Shamir HODL Pack

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The Shamir HODL (Hold On for Dear Life) bundle includes a set of five Cryptosteel Capsules and the Trezor Model T hardware cryptocurrency wallet, packed in an exclusive clamshell box – the ultimate gift set for crypto beginners and experts.

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.

HIGH FLEXIBILITY

supports all printable ASCII characters

IMPROVED SECURITY

passwords are protected, not visible at first glance

ADJUSTABLE SEPARATORS

keep 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.

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. 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. 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 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

What is included in the Shamir HODL Pack?

The Shamir HODL Pack includes 5 Cryptosteel Capsules, a Trezor Model T hardware wallet, a protective and decorative clamshell box, and a detailed setup guide. It’s designed for secure, offline storage using Shamir’s Secret Sharing, splitting your recovery seed into multiple durable, fireproof, and waterproof capsules for added safety

Why do I need a solution like Shamir’s Secret Sharing?

Shamir’s Secret Sharing is a proven standard for securely splitting sensitive information. It’s much safer and more reliable than creating your own method for dividing something like a wallet seed. By using this standardized approach, you reduce the risk of losing access, as the secret can only be recovered when a minimum number of parts are combined. In case of any problems or lost shares, it’s easier to recover access to your wallet compared to non-standard methods.

What are the advantages of the Shamir backup solution?

Enhanced Security: The secret is split into multiple shares, and no single share reveals the entire secret, making it harder for attackers to gain access.
Redundancy: Even if some shares are lost or damaged, the secret can still be recovered with the minimum required shares.
Decentralized Trust: You don’t need to trust a single person or location with the entire backup, reducing the risk of compromise.
Standardized and Reliable: As a widely adopted cryptographic standard, Shamir’s solution is safer than custom or ad-hoc methods for dividing data.
Simpler Recovery: If issues arise, it’s easier to recover your secret (e.g., wallet seed) using this method compared to non-standard solutions.

Do I need to mark the order of capsules in the Shamir backup system?

No, you do not need to mark the order of capsules in a Shamir Backup. Each capsule contains only a part of the seed, and as long as you have the required number of shares, you can reconstruct the seed regardless of their order. However, it’s essential to store the capsules securely and ensure they remain readable and intact.

What happens if I lose one of the Cryptosteel Capsules with a Shamir share?

As long as you retain the required minimum number of shares (determined during setup), you can still recover your crypto wallet. The lost share cannot be used without the others, ensuring your security.

How is Shamir backup different from a traditional seed phrase storage?

Shamir backup differs from traditional seed phrase storage by splitting the seed into multiple shares, where a set minimum number of shares is required to reconstruct the full key. In a traditional seed storage method, a single phrase contains the entire recovery key, making it vulnerable if lost or stolen. With Shamir backup, no individual share reveals the full seed, adding an extra layer of security. Even if some shares are lost, as long as the threshold number of shares is met, the seed can still be recovered. This provides greater redundancy and flexibility compared to traditional seed phrases, which don’t offer these recovery options and rely on a single point of failure.