let's assume I want to "oraclize" this: I want to know if my granma is sleeping or not, so I put a webcam on her bed and stream it accessible from a website (similar to the thief event). I need to be sure she is sleeping so I require at least 200 consensus which should say "TILL the minute 10' of the stream she is sleeping"  => how much it will cost me to get this event and the reply with YES/NO to my smartcontract ? any info about this ?