Concerns about cybersecurity could also take the shine off of bitcoin.
Slovenian cryptocurrency mining marketplace NiceHash, which matches people looking to sell processing time on computers in exchange for bitcoin, said on Thursday it had lost about $64 million worth of bitcoin in a hack of its payment system.
Bitcoin slumped in 2014 when MtGox, then the world's biggest bitcoin exchange, collapsed after saying it had been hacked and had 650,000 bitcoins stolen.
The value of all cryptocurrencies now stands at nearly $430 billion, according to Coinmarketcap.
Bitcoin has more than tripled in price since the start of October, putting it on track for its best quarter since the end of 2013, when it surged above $1,000 for the first time.