What blockchain is Casper on?

Could you elaborate on the blockchain technology that Casper is utilizing? I'm curious to know if it's a variation of Ethereum's consensus mechanism or if it's built on a completely different platform. Understanding the underlying technology is crucial for assessing the potential of Casper and its ability to scale and maintain security. Additionally, I'm interested in knowing if Casper has any unique features or advantages compared to other blockchains in the market.