Any metadata that is stored in EXIF or part of the file can be easily stripped out. This is why Mediachain uses perceptual recognition technology similar to Shazam or Google Image search to identify media based on how it looks or sounds, automatically resolving to metadata stored in Mediachain. Near duplicate image detection is quite far along and works very well even for images that are cropped, distorted, etc.

More on our approach in this post: https://blog.mediachain.io/perceptual-resolution-9c00ad5ca55...

Details on the implementation in this RFC: https://github.com/mediachain/mediachain/blob/master/rfc/med...