I suspect that if I were sufficiently uninvested in my continuing existence to be willing to terminate it on being assured that a similar-enough person lives in Chicago (which I can easily imagine being), I wouldn’t require enormous confidence in that person’s existence… a quick phone call would suffice.
My main worry would be that my copy hadn’t actually got to Chicago. I’d want to make damn sure of that before I let the original be killed.
I suspect that if I were sufficiently uninvested in my continuing existence to be willing to terminate it on being assured that a similar-enough person lives in Chicago (which I can easily imagine being), I wouldn’t require enormous confidence in that person’s existence… a quick phone call would suffice.