How was the traditional punishment of "cowhide wrapping hands" carried out in ancient Tibetans?

Tibetans have a traditional punishment called "cowhide wrapped hands". When executing the punishment, the criminal's hand is cut into many blood channels with a knife, then the salt is put in his palm, held by his hand, wrapped in a piece of raw cowhide and sewn tightly with leather thread. The scar on his hand was soaked in salt, and the prisoner was in terrible pain. After a while, the cowhide of Bao's hand was uncovered, and all the muscles on his hand were necrotic, leaving only a handful of bones. Although this punishment did not cut off the hand, it caused more pain than the broken hand.