With deepfake, nobody can ever trust video again. Perhaps, video taking should come with blockchain or some watermark technology, all alterations can be traced back to its original clips. Viewers will be notified that the clip is altered with deepfake technology.
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Thank you for your comment @wyp.
Hopefully. Unfortunately we are not always able to track the source of a particular clip, but maybe we will come up with some technology detecting deepfake.