For the current year, your crypto exchange will for the first time report to Germany's Federal Central Tax Office what you have bought, sold and swapped. That report, however, contains not a single figure describing your profit. What it contains are aggregated gross amounts per crypto-asset: the sum of your purchases, the sum of your sales and the market value of every swap from one cryptocurrency into another. Anyone who reshuffles thirty times a year shows up there with a volume that is a multiple of their own portfolio value, while what is left at year-end may be a three-digit gain.