Serving up bottles of select vine varieties, Picnic Wine Co. was the first winery dedicated to selling wine exclusively for bitcoin. Emblazoned on their bitcoinwine.com homepage, a prominently displayed mission statement reads, “Let’s stay in Bitcoin, shall we? The bigger the ecosystem grows, the fewer reasons to go back and forth between fiat . . . Close the loop.”A product of the millennial generation, Picnic Wine Co. was founded by three school...