FILE PHOTO: CEO Tidjane Thiam of Swiss bank Credit Suisse attends the bank's extraordinary shareholder meeting in Zurich, Switzerland May 18, 2017. REUTERS/Arnd Wiegmann

ZURICH (Reuters) - Credit Suisse CSGN.S Chief Executive Tidjane Thiam on Thursday expressed caution about Bitcoin, saying the current interest in the crypto-currency could eventually subside.

“Bitcoin presents a number of challenges. The first of them is really the anonymity,” Thiam told a results news conference. “I think most banks in the current state of regulation have little or no appetite to get involved in a currency which has such anti-money laundering challenges.

“From what we can identify, the only reason today to buy or sell Bitcoin is to make money, which is the very definition of speculation and the very definition of a bubble.”

Bitcoin rocketed above $7,000 for the first time on Thursday, after a more than sevenfold increase in its value since the start of the year.