Hello there. Basically in my story I want the villain to set up a kidnap and ransom video that is broadcasted live and online, where he will kill the hostage, if his demands are not met. I want for the video to made untraceable, but then with the later video, close to the hostage's time limit, the cop's trace it and find the place in time. I want it to happen just at this right time to get all the key characters in the same place at the same time, where they need to be, for the story to continue. Now I was doing research and asking cops how this works. A lot of cops were reluctant to talk about it, but one who is into writing himself did. He gave me some complex tech scenarios, I can use, but basically a video can be either traceable from the beginning, or not traceable at all. But he cannot find a way where it is untraceable, then later the cop's finally figure it out. The villain can either have a smart set up or an amateur one, but he cannot go from smart to amateur in a realistic way, when it comes to these things. So I am wondering, what if I just left the explanation out as to how they finally traced it to the reader? What if the line of dialogue from one cop to another goes "I'll skip the technical crap, the videos are made to be untraceable". Then later when they finally do trace the last broadcast in time, one of the cops says "We figured out how to trace it, but we'll never get this opportunity again!" That way the villain can continue making videos after, and they cannot trace the further ones. But do I need more explanation than this, and more research is required to satisfy the reader? Cause I was told my scenario is unrealistic, and it can be either traceable, or not, realistically. What do you think? Thanks for the input.