What is "zip-hash"?

Question

Java

Hello! At the moment, the cracking launcher, written in Java, in the request that the launcher sends to the server in the response, "zip-hash", "md5", "url", etc. are indicated. I have already faked the whole answer, but there is one misunderstanding left, I don’t understand how to understand "zip-hash" and how it is taken, it itself consists of 14-15 digits (there is a screenshot) , I will be glad to help! (and yes, I looked through IDA Pro, I did not find anything)

Answer 1

This is some kind of digital signature that allows you to check whether the file has really arrived complete and unchanged. Usually all kinds of archives, images, and so on are signed this way. There is purely for security, so that it is impossible to replace the file