The State of Blockchain Interoperability in 2021

After nearly 9 months of work, version 3 of “A Survey on Blockchain Interoperability: Past, Present, and Future Trends” is out. This survey depicts the state of blockchain interoperability as of March 2021, by collecting and analyzing 404 documents.

Three main categories of solutions exist Public Connectors (previously known as Cryptocurrency-directed approaches); Blockchain of Blockchains (previously known as Blockchain Engines); Hybrid Connectors (previously known as Blockchain Connectors).