.js file authentication?

Question

JavaScript

GTA 5 game server on rage mp, there are .js script files on the client side, when the game starts they are checked for authenticity, if there have been changes, the file is deleted and downloaded again, on what basis is the check performed? Is it possible to replace this file with a modified one so that the server accepts it? Thanks in advance.

Answer 1

The content of the file is hashed, for example, sha1. And, accordingly, do not replace it, unless you know how to find collisions for this hash.

Answer 2

when you start the game, they are checked for authenticity, if there were changes, the file is deleted and downloaded again, by what principle is the verification performed?

Do you find anything strange?