Aug 18 (Reuters) - Robinhood Markets Inc reported a 131% jump in second-quarter revenue on Wednesday as the online brokerage benefited from a surge in cryptocurrency trading through its platform. The company, which was at the center of the historic “meme stock” trading mania earlier this year, posted a total net revenue of $565 million for the quarter ended June 30 compared to $244 million a year earlier. (Reporting by Sohini Podder in Bengaluru; Editing by Arun Koyyur) Our Standards: The Thomson Reuters Trust Principles.