How does Wanchain work?

Could you elaborate on how exactly does Wanchain function? I understand it's a blockchain-based platform that aims to bridge the gap between different blockchains, but how does it achieve this interoperability? Does it utilize a unique consensus mechanism or rely on smart contracts to facilitate cross-chain transactions? Additionally, how does Wanchain ensure the security and privacy of these transactions, given the complexity of connecting disparate blockchain networks?