Riot Platforms faces a tough road ahead due to the recent Bitcoin halving event, but it is looking to get bigger and more efficient.Riot Platforms (RIOT -10.51%) is one of the top Bitcoin mining companies you can invest in today. Year to date, however, the stock has been struggling, and it's down 30%. But recently the company posted some impressive earnings numbers, even turning a healthy profit. Could Riot Platforms be an underrated stock to buy right now?The company posted record numbers in Q1On May 1, Ri ...