Last year’s Hong Kong Carnival, around 5 a.m., I was lying on the narrow bed in my hotel room, forcing myself to endure the discomfort caused by the phone’s bright light. With a grave expression, I stared at the Ethereum price chart, occasionally switching back to the contract interface of my holdings, watching helplessly as Ethereum plunged step by step to over 1,300 points. My brain was running at full speed, trying to figure out where I could get money to top up the contract margin.