Gemini, a cryptocurrency company backed by the billionaire Winklevoss brothers, is considering an IPO this year, according to people familiar with the matter. The company and the custodian are currently discussing the possibility of going public with potential advisers, and no final decision has been made, the sources said, as the information has not been made public. According to the company's website, Gemini currently has more than 500 employees in New York, Seattle, Singapore, London, Dublin, and Gurgaon, India.