ZeroCross: A sidechain-based privacy-preserving Cross-chain solution for Monero

Summary: Blockchain interoperability is becoming a crucial feature of blockchain technology, with fragmented knowledge posing challenges for achieving seamless interoperability. A literature review of 404 documents, including 102 analyzed papers, categorizes studies into Public Connectors, Blockchain of Blockchains, and Hybrid Connectors, providing a holistic overview of blockchain interoperability. The review highlights the broad spectrum of blockchain interoperability beyond cryptocurrencies and cross-chain asset transfers, discussing supporting technologies, standards, use cases, open challenges, and future research directions.