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.
It's over now, I bought a Satochip, and I'm waiting for delivery in the next few days. 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.
It seemed to me to be a better choice for a long-term hold, and I also like the possibility of supporting several other altcoins. I wish to have such an option in the coming years.
Once I get it, I'll write my impressions.
Yes, you're right. For long-term holdings and security, it's best to use a device that you can easily back up. Satochip can be backed up using the seed phrase, but Satodime cannot.
Personally, I would use Satodime for long-term storage, but only for a smaller amount of Bitcoin—something like $250 worth. You can think of Satodime as being like 20-franc gold coins. It’s easier to carry than a 1kg gold bar and more liquid since you can sell just a few coins.
In short, Satodime does the job as a “Bitcoin dime.”
Thanks for your purchase!