By Trevor Hunnicutt

NEW YORK, March 28 (Reuters) - The U.S. Securities and Exchange Commission on Tuesday denied for the second time this month a request to bring to market a first-of-its-kind product tracking bitcoin, the digital currency.

The SEC announced in a filing its decision denying Intercontinental Exchange Inc's (ICE.N) NYSE Arca exchange the ability to list and trade the SolidX Bitcoin Trust, an exchange-traded product (ETP) that would trade like a stock and track the digital asset's price. Previously, the regulatory agency said it had concerns with a similar proposal by investors Cameron Winklevoss and Tyler Winklevoss.

"The Commission believes that the significant markets for bitcoin are unregulated," the SEC said in its filing, echoing language from its decision earlier this month on the application by CBOE Holdings Inc's (CBOE.O) Bats exchange to list The Bitcoin ETF proposed by the Winklevoss brothers. On Friday, Bats asked the SEC to review its decision not to allow that fund to trade.

"We are reviewing the SEC's order and evaluating our next steps," said Daniel H. Gallancy, chief executive officer of SolidX Partners Inc, a U.S. technology company that provides blockchain services. NYSE did not immediately respond to a request for comment.

Bitcoin had scaled to a record of more than $1,300 this month, higher than the price of an ounce of gold, as investors speculated that an ETF holding the digital currency could woo more people into buying the asset.

But after denial of the Winklevoss-proposed ETF, the digital currency's price plunged (BTC=BTSP) as much as 18 percent. It has rebounded partially since then and was at $1,041 on Tuesday, roughly unchanged from the previous day.

Bitcoin is a virtual currency that can be used to move money around the world quickly and with relative anonymity, without the need for a central authority, such as a bank or government.

Yet bitcoin presents a new set of risks to investors given its limited adoption, a number of massive cybersecurity breaches affecting bitcoin owners and the lack of consistent treatment of the assets by governments.

There is one remaining bitcoin ETP proposal awaiting a verdict from the SEC. Grayscale Investments LLC's Bitcoin Investment Trust, backed by early bitcoin advocate Barry Silbert and his Digital Currency Group, filed an application last year.

Tags：UPDATE 2-U.S. SEC denies a 2nd application to list bitcoin product