An unidentified 36-year-old man who owns a Bitcoin account has lost more than 100,000 euros ($117,000) worth of Bitcoins while he was logged in on a public wireless network in a restaurant in Vienna, Austria.

The Austrian police, however, claimed that they are still investigating whether the victim's account was already hacked before he opened his account on the unsecured network, CBS reports.

This latest case reflects the growing concern over the security of digital currencies like Bitcoin and Ethereum amidst their growing popularity as a mode of payment.