Mining. In cryptocurrency networks, mining is a validation of transactions. For this effort, successful miners obtain new cryptocurrency as a reward. The reward decreases transaction fees by creating a complementary incentive to contribute to the processing power of the network.
It matters because the actual coffee flavor is extracted from grind better at higher temperatures. I'm not a scientist but I trust those that have done the research and they say that the optimal temperature for hot water in a coffee pot is between 195-200 degrees or just a little under boiling.
1 For example, french press coffee has one of the highest caffeine contents because the general process is to allow the coffee to steep for four minutes.  The hotter the water used in brewing, the higher the caffeine. Although you should not brew above 212 degrees.