But zcash, monero and bcash are trending to zero and cannot work transfer value because they are worthless, they hold no value. Remember the fact that money is a store of value first, then medium of exchange, then a unit of account. Platinum gets exponentially easier and cheaper to mine with technological advancement and energy capture. The production of a commodity like platinum always fall to its marginal utility value, zero in other words. Bitcoin mining difficulty scales with technology and energy, it is therefore the hardest most value preserving money possible, the only option for value transfer and its marginal utility always remains on par with the price of the best money because its utility is money.