Concept: digital art market with digital art blockchain timestamp

Any medium can be used to create arts whether they are paintings, sculptures, physical artifact or photography, video, digital media. but why there isn't any digital art market ? Blockchain can help to prove the origin of a digital art and therefore distinguish between the original artwork and mere copies. Does it open up an entirely new market not just in digital arts but in anything of value in digital forms such as: video, codes etc. Discuss anyone ?