Zcash has to prove that the Video of the ceremony has not been edited. So have they used “strict image authentication” techniques as described in the research paper at https://www.etsmtl.ca/ETS/media/ImagesETS/Labo/LIVIA/Publications/2008/Haouzia_MTA_2008.pdf ?
Actually the authenticity of the original ceremony video is no longer relevant. There is a new parameter generation ceremony that will replace the first one with the Sapling network upgrade:
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