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📄️ How to Build an Oracle Service

As described in this tutorial, a blockchain oracle is a third-party service or agent that provides external data to a blockchain network. It is a bridge between the blockchain and the external world, enabling smart contracts to access, verify, and incorporate data from outside the blockchain. Specifically, the oracle service provides external data along with a Rabin signature of the data, and the smart contract uses this data and verifies the signature before using it.