After reading some topics on the implementation of ZK methods in the Ethereum, how would this affect the PoW?

Please have someone correct me if I am wrong (I started recently), but if the nodes need to validate transactions, how can they do it without having access to the information?

For example: a smart contract fulfills a condition when person A makes a payment of 1 Ether to person B. With ZK methods this information is not known. Therefore, if it is not known, how can the nodes validate that the contract has been correctly fulfilled if it is not possible to access this information?

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