system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: After you have signed a contract what stops anyone from switching out the pages of the contract and making it seem like you signed something else?
gpt
You get a copy and they get a copy, if the copies don't Match for some reasons, that's for the courts to sort out.

Really important contracts will have you initial on every page to keep shenanigans like that from happening.