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## Consensus 3.X Oracles used
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Oracles are external resources of information.
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The TFChain captures and holds that information so we get more certainty about the accuracy.
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We have oracles for price & reputation for e.g. TFFarmers and TFNodes.
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These oracles are implemented on TF_CHAIN for TFGrid 3.0.
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```mermaid
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graph TB
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subgraph Digital Currency Ecosystem
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money_blockchain[Money Blockchain Explorers]
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Exch1[Money Blockchain Decentralized Exchange]
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OracleEngine --> Exch1[Polkadot]
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OracleEngine --> Exch1[Money Blockchain Exchange]
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OracleEngine --> Exch2[Binance Exchange]
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OracleEngine --> Exch3[other... exchanges]
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end
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subgraph ThreeFold Grid
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Monitor_Engine --> TFNode1
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Monitor_Engine --> TFNode2
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Monitor_Engine --> TFNode3
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end
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subgraph TFChainNode1[TFGrid Blockchain Node]
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Monitor_Engine
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Explorers[TFChain Explorers]-->TFGridDB --> BCNode
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Explorers --> BCNode
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ConsensusEngine1-->BCNode[Blockchain Validator Node]
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ConsensusEngine1 --> money_blockchain[Money Blockchain]
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ConsensusEngine1 --> ReputationEngine[Reputation Engine]
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ReputationEngine --> Monitor_Engine[Monitor Engine]
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ConsensusEngine1 --> OracleEngine[Oracle For Pricing Digital Currencies]
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end
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```
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- See [Roadmap TFChain/DAO 3.x](roadmap_tfchain3) for info of implementation.
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