Is STORJ on Ethereum?

Excuse me, I was wondering if you could clarify something for me. I've been hearing a lot about STORJ, and I'm curious if it's built on the Ethereum blockchain. I've seen some references that suggest it is, but I've also come across information that seems to contradict that. Could you please help me understand whether STORJ is indeed an Ethereum-based project, or if it operates on a different platform altogether? Thank you for your time and expertise.