Wow. Some guys sold $110k calls with a notional value of 2000 BTC, expiring on March 28th. Trades of this size are not common, especially considering the recent low volatility levels. This could be a block trade from a long-term asset management institution that prefers to sell some of its BTC for around $110k strike. If the price doesn't rise to the expected level, the trades can still get over 3.5m premiums. Good trade.