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All he needs to do is put his signature with the Steemit logo to prove this is his drawing. @geonusantara we need to see proof this is yours!

Do you still have the picture, if so write out your signature, the date and steemit on a little card next to your drawing or have a picture of yourself holding your drawing. I had to do this when I first started steemit. I was considered part of the verification process for steemit artists. I usually check but I forgot to this time.