Post
Topic
Board Hardware wallets
Re: 🔥Satochip🔥 Hardware wallet on smart card (USB/NFC)
by
koromas
on 07/05/2025, 16:28:18 UTC
It's obvious and easy to see differences and compare all products on their website, but they only looking similar from the outside.
In short, Satochip is a hardware wallet for making transactions, and Satodime is more like physical bitcoin aka the bearer cold storage.
https://satochip.io/compare/


Yes, I saw this comparison. The difference is only in the use value.
The hardware differences interest me. As far as I can see, both solutions use the same EAL6-certified secure element, so it seems it's just a matter of software.

In terms of hardware, there is no difference. Each product uses the same J3Rxxx smart card equipped with an EAL6+ certified chip (SE).

Satochip is a signing device, which means that it can sign a transaction using the unique private key stored inside its SE.
Satodime is not a signing device. It can generate a Bitcoin key pair (up to 3) inside its SE and will only reveal the private key if requested by the bearer. If you want te retreive the Bitcoin from a Satodime, you'll have to unseal the keyslot and sweep the private key in your existing wallet.

Same hardware - different products - different use cases.

First off, cool project. I definitely want to try this out.

I'm curious - what is the exact model of the cards, j3r110, j3r150, j3r180? Do you mind disclosing where you get them from? The reason I ask is, I've been looking at these for a couple of days and find the whole smart card landscape quite confusing. As far as I can tell, the j3xxx cards use NXP P71D321 chip/secure element. However, are the cards themselves manufactured by NXP? They're sold as such by some sellers (e.g. Cardlogix) but I can't find a single mention on NXP's website. So I'm a little worried about the source - is there a way to make sure the hardware is actually genuine?