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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.
+
+We have oracles for price & reputation for e.g. TFFarmers and TFNodes.
+
+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
+        Monitor_Engine --> TFNode1
+        Monitor_Engine --> TFNode2
+        Monitor_Engine --> TFNode3
+    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.
+