File fingerprint

A sequence or letters or numbers that represent the contents of a file. Changing the file even a tiny bit will completely change its fingerprint. Checking the fingerprint of a file that you've downloaded, such as a software application or extension, helps to make sure that you got the same file that other people have, and that nobody has tampered with it while it was being downloaded.

Также говорят: 
file hash value
JavaScript license information