Yes most people hold up a sheet of paper with the date, their Steemit name and a signature. Read this post for more information - you can even do it confidentially if you want (which is understandable if you suffer from bipolar disorder or depression):
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I updated this post, you can see my photo with one of my works and name)
Excellent. Thanks:)
Thank you for your wise advice!
I will make special post with my photo later to prove that I'm realy me)