Disclosure: Cryptosteel sent The Block the Capsule unit that is reviewed in this article.
Before we get started, although one of Cryptosteel’s stated selling points for the Capsule is that it’s waterproof, fireproof and shockproof, this article is not about stress-testing the product, as I do not have access to acid, a blowtorch, or hydraulic press. Stress test reviews will be left to those better suited to write them. For The Block’s series of reviews, we will approach products from the perspective of an everyday consumer.
The Capsule came in a cardboard box with your typical plastic wrapping.
Upon unwrapping the box, we are presented with an instruction guide and a plastic case holding our Capsule and the tiles needed to record our private key.
Below is a picture of the items in the plastic case:
The numbered items include:
- Capsule core for holding character tiles
- Capsule outer layer for protecting the core and tiles
- Fastener for securing the tiles in place
- Separator for separating words
- Character tiles for recording private keys
According to Cryptosteel, the Capsule holds up to 123 characters, including the separator and fastener. With your typical 24-word private keys, this means it is unlikely you would be able to record the entire seed phrase using the Capsule. This, however, does not matter. Because most hardware wallet manufacturers follow the BIP39 standard, one would only need the first four letters of each word to recover their entire word and private keys.