I think you might need to provide more details. Where are the scans "coming through", what type of modifications are you trying to detect, and at what points in the process might those modifications occur?
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Files are uploaded by users.
I am trying to detect any modification that has occurred after the original image, video or scan has been captured therefore any modifications made by the users prior to upload.
Eg. User takes a photo, modifies it, uploads it, I scan it (with required software/service), tells me its modified.
Cheers