Now, as bitcoin surging and tumbling, concerns about its potential impact on other global asset markets are growing.
Ron William, the founder and chief market strategist of RW Market Advisory, said on Friday that if bitcoin prices continue to fall, other markets may start to feel the impact.
William said the falling price of bitcoin was "very normal", but if it slipped further, it could have a "broader" impact.
"The price of bitcoin is very unreasonable," William said in an interview with CNBC. At the moment, it seems that if prices continue to go down, it may have a broader contagion effect on other markets.
Garrick Hileman, an economic historian and expert at University of Cambridge, said that if encrypted money becomes a systemic risk of the financial system, it will lead to the next financial crisis.
Hileman said that more and more financial institutions have expressed interest in comparing with the encrypted currencies such as the special currency, but in a rapidly changing situation, they may become "systemically important", thus forming a "systemic risk".
The EU and British authorities are planning to fight bitcoin, as concerns about financial crimes and money laundering are increasing. As more and more financial institutions are entering this field, encrypted currencies can also cause the next crisis.