AUSTIN — There is a sort of clubhouse for Austin's bitcoin believers on the second floor of the Littlefield Building at the corner of Congress Avenue and Sixth Street. The hideaway is at the crossroads of two worlds — the majestic thoroughfare that leads to the Texas State Capitol and the iconic, albeit notorious, stretch of bars, restaurants, and live music that define the capital's party vibes. It's an apt metaphor for the space itself.The Bitcoin Commons is, at once, many things.By day, it fu...