Even if you prefer Gold or Silver, there is no guarantee that they will get a steady growth of 20% to 35% investment has no guarantee and gives you a short history. Silver is valued higher than Gold, look where they are now? This gives an understanding that in the future there is no guarantee what will happen to their prices. And in Bitcoin you do not have to wait until it reaches $ 16,000 to double your money, you can buy and sell it even with just a $ 100 or 200 price drop, you will be surprised at how quickly you will double your money in the technique rather than waiting for the target price big, so will not be able to blockchai without bitcoin so bitcoin tiadak will be without blockchain, they have a synergistic role.