What chain is Kava on?

Could you please elaborate on the blockchain technology that Kava utilizes? I'm particularly interested in understanding the specific chain it's built upon. Is it a standalone blockchain or is it integrated with an existing network? Could you also provide any insights into the advantages or unique features of this chain, especially in the context of Kava's functionality and its role in the broader cryptocurrency ecosystem? I'm keen to understand the technological foundation that supports this project.