According to reports, Riot Blockchain, a mining company listed on Nasdaq, reported that mining revenue in the first quarter increased by 881.1% to 23.2 million U.S. dollars. Riot Blockchain reported that during the three months ending March 31, the profit margin of mining revenue increased to 67.5%, compared with 40.4% in the same period last year. Four hundred ninety-one bitcoins were mined in the first quarter, increasing 62.0% over the previous quarter, and 303 bitcoins were mined in the fourth quarter of 2020.