The Bird on Nostr: Okay but then what is responsible for the transaction hashing to make sure it's ...

Okay but then what is responsible for the transaction hashing to make sure it's correct?

I was under the impression that miners did the hashing and block mining. Which adds to the security of the network. Am I incorrect or missed something out in that?

I know it's oversimplified, but to keep the miners, even after block rewards are gone are still very important to the continuation of the security of BTC