Hyperledger Global Forum 2021

Blockchain interoperability is emerging as one of the crucial features of blockchain technology, but the knowledge necessary for achieving it is fragmented. This fact makes it challenging for academics and the industry to seamlessly achieve interoperability among blockchains.Given the novelty and potential of this new domain, in this talk, we present an overview of blockchain interoperability, based on a survey comprising a corpus of 332 documents. Our review classifies studies into three categories: Cryptocurrency-directed interoperability approaches, Blockchain Engines, and Blockchain Connectors. Each category is further divided into sub-categories based on defined criteria. We discuss not only studies within each category and subcategory but also across categories, providing a holistic overview of this area including the most recent Hyperledger project, Hyperledger Cactus.