Central Banks and the Bitcoin Bubble Fears

Bitcoin Mania – Potential Risks

https://www.theguardian.com/technology/2017/nov/29/bitcoin-world-economy-bank-of-england-jon-cunliffe-price

Central Bankers Start to Pay Attention to Crypto-Currencies

https://www.bloomberg.com/news/articles/2017-11-26/what-the-world-s-central-banks-are-saying-about-cryptocurrencies