the shroud of turin is real

The shroud is undebatably  real. It exists, therefore the proposition cannot be refuted.

But lets take it a step further, not only is it real but it's authentic as well.

There is no explanation that accounts for all details of the shroud other than it's authenticity.

The carbon-dating was admitted to be heavily flawed even by the institution that carbon-dated it, so there is no evidence it's from the middle ages.

The paint on the shroud doesn't account for the actual image and is thought to be from artists rubbing their own shroud copies on the real one thinking it might transfer the shrouds divine properties onto their replicas.

There is real human blood on the shroud which matches realistic blood-flow patterns and every injury on the human figure in the shroud matches the description of how Jesus was injured in the gospels.

The image is a photographic negative made in a time before photography was invented and has 3-dimensional properties which can only be observed using imaging technology invented by NASA. The linen fibers which make up the image show extreme aging, as if they were burned with radiation. 

I havent seen it, so I guess proposition is refuted for me or any voter who didnt see it.

No one can explain the shroud, it is the greatest piece of supernatural evidence to ever exist.