Ben Fisher noticed and posted on Twitter that if you try to edit a business's hours in Google search under the local knowledge panel, it will ask you to submit a photo or scan of the business hours. Google asks you to "take a close-up photo that clearly shows the hours for Google to scan." Google said that adding "a photo to help us verify your suggestion." Google also said the the photos can be used publicly under your name.
Here is a screen shot, again, this only shows when you edit a listing through Google search, not in Google My Business:
In Google My Business, since you are verified, you do not need to upload any photo evidence:
Forum discussion at Twitter.
