After a long buildup, Cameron and Tyler Winklevoss have won approval to open their Bitcoin exchange, Gemini, later this week.

The twins, famous from their legal battles with Facebook’s co-founder Mark Zuckerberg, announced on Monday that they had received approval for their exchange from the New York State Department of Financial Services, the state’s top financial regulator.

The agency, which has taken the lead in regulating the new virtual currency industry, had already approved another company, ItBit, to operate under a similar regulatory framework as a banklike trust company.

The Winklevoss twins have been working on their exchange for more than a year, with help from veterans of other large technology companies. Gemini will hold customer money in federally insured bank accounts. The exchange aims to make it easier for large institutional investors to buy and sell Bitcoin.