1. 内在机制
1.1 step说明
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step1：A requester creating a smart contract specifying the data required to trigger the execution of the contract and deploy on the blockchain. The requester can be either a user or a component of a software system.
用户或软件创建和发布一个智能合约
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step2：Centralized oracles can automatically identify requirements specified by a smart contract
中心化的预 言机收到了请求
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step3, step4：预言机与外部数据源交互，得到数据。
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step5：预言机将数据上链
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step6：the requester will be able to see this data in their execution of a smart contract
智能合约执行完，用户能看到数据
1.2 两个特点：
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Oracles introduce a trusted third-party into the decentralised blockchain system.
预言机是可信的第三方。
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Blockchain tramsactioms are immutable, but the external state used for oracle data may change.
交易不变，但是预言机的数据状态可变。
2. 各区块链预言机总结
【参考】
[1] “Reliability analysis for blockchain oracles” Reliability analysis for blockchain oracles Volume 83, May 2020
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