The move is seen as a watershed moment for virtual currencies. However, concerns over banks and investors’ exposure to a bubble that could soon burst are intensifying. “As more traditional banks and brokers begin to offer markets in these assets, investors and savers will start to be exposed,” said Simon French of Panmure Gordon. “Regulators need to be vigilant; crypto-currencies could quickly begin to impact the share prices of regulated banks and brokers in a way that few yet understand.”