Board Thread:The Panopticon/@comment-25041817-20151128210342/@comment-82.72.148.149-20151129172606

Yes and no.

The Doctor's "essence" - for want of a better word - is stored inside the teleporter's hard drive. The teleporter acts like a 3d printer, i.e. it uses the data like a blueprint to construct a copy that is, presumably, exactly identical. All of the Doctors are the original because they're based on that blueprint, but the one who was given the teleport bracelet by Ashildr in "Face the Raven" is dead ... along with some seventy billion exact duplicates.