info_tfgrid/collections/tech/grid/consensus3_mechanism/consensus3_oracles.md

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## Consensus 3.X Oracles used
Oracles are external resources of information.
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.
```mermaid
graph TB
subgraph Digital Currency Ecosystem
money_blockchain[Money Blockchain Explorers]
Exch1[Money Blockchain Decentralized Exchange]
OracleEngine --> Exch1[Polkadot]
OracleEngine --> Exch1[Money Blockchain Exchange]
OracleEngine --> Exch2[Binance Exchange]
OracleEngine --> Exch3[other... exchanges]
end
subgraph ThreeFold Grid
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Monitor_Engine --> TFNode1
Monitor_Engine --> TFNode2
Monitor_Engine --> TFNode3
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end
subgraph TFChainNode1[TFGrid Blockchain Node]
Monitor_Engine
Explorers[TFChain Explorers]-->TFGridDB --> BCNode
Explorers --> BCNode
ConsensusEngine1-->BCNode[Blockchain Validator Node]
ConsensusEngine1 --> money_blockchain[Money Blockchain]
ConsensusEngine1 --> ReputationEngine[Reputation Engine]
ReputationEngine --> Monitor_Engine[Monitor Engine]
ConsensusEngine1 --> OracleEngine[Oracle For Pricing Digital Currencies]
end
```
- See [Roadmap TFChain/DAO 3.x](roadmap_tfchain3) for info of implementation.