# Advanced Checks

- [Using Advanced Checks](https://blockchainlens.gitbook.io/cardano-spot-check/advanced-checks/usage.md): Use these checks to verify if your node does not have hidden issues that prevents it from creating blocks.  These issues cannot easily be discovered unless you are looking for them in particular.
- [KES Checks](https://blockchainlens.gitbook.io/cardano-spot-check/advanced-checks/kes-check.md): Rotating your KES keys is one of the regular maintenance activities of Stake Pool Operators.  Unfortunately, this activity can introduce hidden issues like the ones below:
- [VRF Check](https://blockchainlens.gitbook.io/cardano-spot-check/advanced-checks/vrf-check.md): Use these checks to ensure that you are using the correct VRF File
- [Time Sync Check](https://blockchainlens.gitbook.io/cardano-spot-check/advanced-checks/time-sync-check.md): Check if your node clocks are properly synchronized
- [Config File Check](https://blockchainlens.gitbook.io/cardano-spot-check/advanced-checks/config-file-check.md): Use these commands to verify if you have the correct versions of your configuration files.  These are useful to check when you have an unknown issue


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