# Validation Requirements Situations we need to do validation in: * Importing a block * All validations from beacon chain spec * OperationValidator.validateForStateTransition (for some things) * Replaying a known-valid block * Skip as many validations as possible * Received gossip message * Subset of validations as per p2p-interface spec * Decide if it's valid to put into a block we create * OperationValidator.validateForBlockInclusion * Called from OperationPool * Decide if it's valid to add to the operation pool * May not need to be a separate case... * Including when re-adding to the pool because of a reorg.