So, I removed all of the old knob and tube from my attic and now I have several places where there is 3" of old wiring popping up from the ceiling where I cut the wires. I'm sure that there is no power coming to these wires now, but what do I do to give the next guy that comes along a level of comfort that they're dead, so they don't have to go through what I went through. Also, do I have to be worried about someone coming along and tying back into the old wires in the wall and restoring power to these wires? I'm thinking of just taping off all of the stubs and leaving them to rest under the insulation. Any suggestions would be appreciated.