This question already has an answer here:
I wonder what are common practices these days, in order to provide a certificate of authenticity, however limited, to a printed photograph.
Here I have the art-photography world in mind; exhibitions where larger prints and elaborate frames are common.
Should there be a signature of the artist on the picture? Should it be on the front? Or bettter on the back side?
Should prints be rubber-stamped on the back ? Do exhibits provide a running counter (e.g. "51/100") like for printed handcrafted artworks such as, say, an etching? Is it common to provide it for pictures of certain minimum size only?
I know that it is unusual to sign a small framed picture, but what about larger ones?
Is a digital signature on the front considered amateurish?
I know these are several questions, but they are all closely related. Maybe someone can answer this comprehensively, or provide a link to reference that discusses all this.