Your algorithm for sameness (DRM by blockchain) will not work because for starters one simply modifies the copyrighted work ever so slightly so as to not trigger the algorithm; however in order to sell the algorithm you did have to concede my point that intellectual property rights enforcement inevitably leads to an Orwellian super state and environmental degradation.
Edit: The fact that this algorithm does not work does not mean that there may not be a market for this technology starting of course with the MPAA.
I envisioned a smarter algorithm that can detect likeness the way a human can.
No I have to concede that such an ambitious algorithm (if it worked) could render copyright infringement administration much more efficient (as you admit in your edit).