According to researchers, log files obtained after Mt. Gox filed for bankruptcy show a user named "Markus" with no location data, somehow avoided paying transaction fees, and gathered total of 335,898 bitcoins worth $76 million with this account over a period of 225 days.
Additionally, 49 other accounts were found to be missing data. Researchers have now dubbed these accounts “Willy Bot”. They purchased 268,132 bitcoins worth exactly $2.5 million over the course of 64 days. Bitcoin saw a rise in price of over 600% during this same period.
“Markus” and “Willy Bot” averaged 21 percent and 18 percent of Mt. Gox’s daily volume, respectively, while they were active.
Source:
https://www.inverse.com/article/40229-bitcoin-price-manipulation-skyrocket
