Hot off the heals of his appearance at the Bitcoin 2021 conference over the weekend, Michael Saylor's Microstrategy (MSTR) announces a private offering of $400M of senior secured debt.Proceeds will be used to buy more bitcoin (BTC-USD). The company currently holds more than 92K coins.Bitcoin this morning is up a hair to $36.6K.Michael Saylor participated in a lively fireside chat with Max Keiser at the Miami conference on Friday. Saylor expressed no concern with bitcoin's recent price action, continuing to focus on the long-term adoption theme.Wrapping up the conference on Saturday, the president of El Salvador announced his intention for his country to make bitcoin legal currency.