As the proof-of-work problem becomes increasingly more difficult the interval between block generation increases exponentially. What happens when the number of transactions in the system outpaces the block generation rate? Won't we be in the situation where we can no longer grow the block chain fast enough to include all of the ongoing transactions in blocks? If I've misunderstood something from the paper or the code please chime in and correct me, because I'm a touch worried about the future of the currency. Tongue