What network is WBTC on?

Could you kindly enlighten me on the matter of WBTC? I'm particularly interested in understanding the network it operates on. Is it based on a specific blockchain technology? Or perhaps, it utilizes a hybrid approach? I'm also curious to know if it interfaces with other networks, enabling cross-chain interoperability. Would you be able to provide a brief overview of the network WBTC resides on and its key characteristics? Thank you for your time and assistance in clarifying this matter.