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The original article can be found on Narutopedia at Curse Technique: Death Controlling Possessed Blood.
This technique is one of a Jashinist's primary methods of killing opponents in the way of the Jashin religion. First, the user makes every effort to draw blood from their opponent and ingest it. Their skin then turns black with white markings which makes him them like a skeleton, a symbol of absolute death. The user then draws Jashin's symbol on the ground in blood and stands in the center. This serves as the link between them and their victim.
Once the sacrificial ritual takes place, the victim is linked with the user until they either step or are forced out of the circle. Any kind of physical injury that they inflict upon themselves (or the injuries a foe inflicts on them) is reciprocated on the target, be it a mere scratch to a pierce in the heart. If the user is forced to step out of the circle, the link is broken and the victim is set free, but all they must do is to step back into the circle to reactivate the link. Basically, this technique makes them a living voodoo doll.
In order to be capable of using this technique one must have received the bodily modifications and chemical injections to make oneself an "immortal".
- Canon-wise, Hidan's immortality is due to the "successful experiment of the Jashin religion's secret technique", so he can fatally torture his opponents in any way he desires without killing himself, and he clearly enjoys the pain as well. However, he does indeed complain that it hurts like one normally does in pain, after he finished off Asuma.