when i study cosmos sdk application development, i have a confusion about how its transactions are validated. It looks to me only the application itself know how to validate its transactions, then how validators can do the validation.
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Every node (including validator node) runs a copy of the application, so the validation (CheckTx) is done by the application in the validator node.
The blockchain acts as a state replication machine, so all copies of the application should (eventually) get to the same state.
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can someone help
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