Yesterday the World Economic Forum (WEF) published a white paper on blockchain interoperability written in collaboration with Deloitte.
The paper starts off exploring the need for interoperability, such as a blockchain with a narrow use case, perhaps for bills of lading, which needs to interoperate with a broader supply chain blockchain. Typically most supply chain blockchains need to support insurance and trade finance and hence potentially be interoperable with blockchains offering these services.
Interoperability is one of those terms that has a broad meaning. Typically, blockchains interoperate with legacy systems, although these integrations usually use application programming interfaces (APIs). Additionally, smart contracts often access external data or feeds, and these are referred to as oracles.
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