[saurik]

This analogy makes it sound like there were a certain number of Bitcoins inside the computer and they are all already discovered... why does it matter if a computer is used or not: all that should matter is how fast it is (and that would be difficult to lie about as you would notice immediately upon receiving it if it wasn't as fast a second claimed), and the buyer should know how fast of a computer they are willing to buy at a given price.