What are blockchain oracles?Blockchain oracles are entities that connect blockchains to external systems, allowing smart contracts to execute depending on real-world inputs and outputs. Oracles give the Web 3.0 ecosystem a method to connect to existing legacy systems, data sources and advanced calculations. Decentralized oracle networks (DONs) enable the implementation of hybrid smart contracts, in which off-chain infrastructure and on-chain code are coupled to provide complex decentralized a...