Unfortunately the Titleist website doesn't actually that. You can register products with serial numbers, but that's about it. It doesn't actually tell you if the serial number is genuine or not. If it was of course it wouldn't mean the clubs are genuine.
While this is the ideal, it never works out so perfectly. Far better to be waiting a few seconds on each shot than to be hanging 1/2 shot behind the group in front of you. If every group was to play by that philosophy and the first group is playing at the course pace, the 6th group would already be 3 shots off the pace, and it just goes downhill from there.