Cryptosteel Capsule SOLO

Ensure the safe keeping of your important information with the CRYPTOSTEEL Capsule SOLO, a stainless steel capsule with up to 123 characters. This innovative capsule enables secure storage of the Bitcoin word seed in compliance with BIP39, BIP32, SLIP39 and WIF private key standards. The AISI 303 steel outer part and AISI 304 steel inner components ensure durability and protection. Choose Capsule Solo for safe storage of your valuable information.


Flexible copy

The Cryptosteel Capsule SOLO contains flexible spacers that allow 123 characters to be stored. The package also includes a set of ASCII characters that allow you to write passwords with numbers and symbols. All signs are deeply stamped for longevity and resilience. The capsule can thus store a random password without spacers, a 12-word mnemonic seed or the first 4 letters of a 24-word mnemonic seed (or 25-word for Monero).

Standard characters

The Cryptosteel Capsule is a way of standardising information protection. The package comes with everything you need for secure storage.

No additional tools are required. The font used is a classic one, which will be legible even after 10 or 1000 years.


The Cryptosteel Capsule SOLO is packaged in a strong cardboard box and the steel signs in transparent plastic.

The packaging makes it easy to organise and find the characters for the password.

The remainder of the signs need not be discarded, as the partially random number of signs in the packaging makes it impossible to deduce from the remainder which signs are used.


  • Capsule dimensions: length – 102 mm, diameter – 16 mm
  • Made of stainless steel
  • Outer shell in AISI 303 steel
  • Interior, spacers, handles and sign plates made of AISI 304 steel
  • All ASCII characters (96 characters) are included in the package
  • Lightweight and easy to carry and hide
  • Highly resistant to fire (up to 1400°C), water, impact and rusting

Backup mode

  • Capsule Solo can cover up to 99% of hexadecimal strings up to 123 characters and random ASCII strings up to 55 characters
  • BIP39 – unabbreviated 12-character seed or 4-character 24-character seed
  • Shamir Backup SLIP39 – 4-character abbreviated 20-letter seed
  • BIP32 root keys
  • WIF private keys
  • Monero mnemonic seed – 4-character 25-letter abbreviated seed

In the package

  • Weight: 540 g
  • Dimensions: 253 x 181 x 25 mm
  • Content:
    • 1x Cryptosteel Capsule
    • 800 random character tiles
Dimensions 182,0 × 253,0 × 25,0 mm


Cryptosteel Capsule SOLO