1. 內在機制

1.1 step說明

• 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.
  用戶或軟件創建和發布一個智能合約

• step2:Centralized oracles can automatically identify requirements specified by a smart contract
  中心化的預言機收到了請求
  .

• step3, step4: 預言機與外部數據源交互，得到數據。

• step5: 預言機將數據上鏈

• step6: the requester will be able to see this data in their execution of a smart contract
  智能合約執行完，用戶能看到數據

1.2 兩個特點：

. ? Oracles introduce a trusted third-party into the decentralised blockchain system.
預言機是可信的第三方。

. ? Blockchain tramsactioms are immutable, but the external state used for oracle data may change.
交易不變，但是預言機的數據狀態可變。

.
2. 各區塊鏈預言機總結

【參考】

[1] “Reliability analysis for blockchain oracles” Reliability analysis for blockchain oracles Volume 83, May 2020

總結

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