We're likely getting close to the point of "maximum optimism" on bitcoin. From what I can tell, this would be the 2nd largest asset bubble (aside from the tulip bubble). All asset bubbles pop and end very badly. http://www.businessinsider.com/bitcoin-ethereum-cryptocurrency-trading-volumes-are-going-bananas-right-now-2017-12?nr_email_referer=1&utm_source=Sailthru&utm_medium=email&utm_content=ClosingBell&utm_campaign=Post%20Blast%20%28moneygame%29:%20STOCKS%20RISE:%20Here%E2%80%99s%20what%20you%20need%20to%20know&utm_term=Closing%20Bell%20-%20Engaged%2C%20Active%2C%20Passive%2C%20Disengaged
Each quarter, the "big boys" in the market have to report their positions because they're so large. Once those reports are made public, it shows what stocks they're adding to or reducing their exposure in and what stocks they've recently bought or completely sold out of.