A widely-appealing and driven brand name which would be ideal for a cryptocurrency company.
The name "USMine" has only six letters and just two syllables. Two-syllable names are exceptionally rare and extremely valued. Leading companies using two syllable names include Lego, Twitter and Gillette.
Usmine.com is a dot-com domain. Dot com domains are the most valuable domain extension in the world, famously used by websites like google.com. A dot-com is the first thing people think of when they think of a website.