Now billing itself as a Bitcoin Development Company, MicroStrategy (MSTR) Wednesday afternoon filed to raise $500 million in a convertible debt offering, with intentions to use the proceeds to purchase more bitcoin (BTC), according to a press release.The company only days ago closed on an $800 convertible debt raise (upsized from an originally planned $600 million), with those proceeds plus some dollars already in the bank used to acquire another 12,000 bitcoin for $821.7 million.Following that ...