Cryptosteel Capsule Duo

Use one steel capsule for your recovery seed and one for your passphrase - each hidden in different places - or use them together for a split, distributed SLIP39 Shamir backup: two capsules is enough for a secure 2-of-2 or 1-of-2 recovery scheme.

Upgrade your hardware wallet backups from paper to steel

Cryptosteel capsules bring peace of mind and keep your seeds protected for years to come. The sleek, steel build will resist corrosion and damage, letting you hide them safely in most any environment. The solid metal design is safe even in extreme conditions, preserving sensitive data offline against fire, floods and other threats.

How do cryptosteel recovery seed backups work?

Cryptosteel capsules use stamped metal letter tiles which are threaded on a steel core. Each word is separated by adjustable separators (included). Using only the first four letters of each seed word as specified by BIP39, this pair of capsules supports 246 characters, so you can split and distribute two shares of a simple Shamir backup, store multiple 24 or 12-word recovery seeds, or get more capsules to use in a more secure 3-of-5 Shamir distributed backup scheme. 

The full tile set includes all ASCII characters, supporting high entropy passwords or passphrases using numbers and symbols, as well as the full list of BIP39 and SLIP39 seed words. Once your seed or other secrets are stored in the capsules, they should be hidden in a safe place until needed. To recover the seeds and restore access to your funds, simply unscrew the capsules and read the words - there is no need to remove the tiles once fixed in place, though you can always swap them for a new seed if needed. 

How does Shamir backup work for securing cryptocurrencies?

Shamir backup , or Shamir’s secret-sharing, provides a better mechanism for backing up secrets by splitting a secret (such as a recovery seed) into multiple shares which must be combined to restore the secret. A minimum threshold of shares must be reached to reveal the secret. For example, you might need 3 out of 5 shares to restore your wallet. Having two shares does not compromise the security at all, while splitting a BIP39 seed would make it easier to bruteforce.

CAPSULE SIZE / PACKAGE WEIGHT

4.0 in x 0.6 in (102 mm x 16 mm)/ 1 lb 6 oz (730 g)

MATERIAL

Stainless steel

Shell made of AISI 303

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

PRODUCT SPECIFICATION

PS-1-2019

DECLARATION OF CONFORMITY

CE-1-2019
 

What's in the box?

2 x Cryptosteel Capsule containers

1 x Tile set (>1400 tiles)