updated smaller collections for manual

collections/farming/certified/certified_node.md

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+![](img/farming_solutions.jpg)
+
+## Certified Node
+
+A Certified Node is a node which comes BIOS locked and does not allow the owner change how the node boots.  
+
+This makes it impossible for the node owner to make changes to the operating system and secure that the node will run the right certified version of Zero-OS.  
+
+The Titan V2.1 node is a certified node.  Certified nodes are eligible for more [farming rewards](farming_reward).
+
+### Requirements
+
+- Node delivered by a certified hardware vendor or through the ThreeFold website.
+- The farmer who owns a certified node will have to sign specifically created terms and conditions
+  - not done yet, will be part of tfgrid 3.0 launch, see [here](farming_certification_terms_conditions).
+- For 2.0 Farmers who started in 2020 or before: agreement about vesting see [vesting_overview](vesting_overview).
+
+### More Info
+
+- [Certified Farming](certified_farming)
+
+### More Technical Details
+
+- The BIOS gets locked.
+- The BIOS gets configured to use TPM2 
+  - more info about tpm2 [here](https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_raj.pdf).
+- TPM2 is a security implementation on the motherboard which allows Zero-OS to securely store private keys, this mechanism is used to identify Zero-OS nodes and make sure they are registered as certified node.
+- If a user would reset the BIOS then the TPM private keys are gone as well.
+- Starting with our TFGrid 3.0 we will use this TPM feature to verify and validate some checks done from tfchain.
+- A certified farmer is required to use certified_nodes.
+
+
+!!!def alias:certified_node