What network is Shrapnel on?

Excuse me, could you please clarify which network Shrapnel is currently operating on? I'm interested in understanding the underlying blockchain technology that supports this cryptocurrency and how it compares to other popular networks in terms of scalability, transaction speed, and security. Additionally, I'm curious if there are any unique features or advantages that the Shrapnel network offers that sets it apart from its competitors. Thank you for your time and assistance.