Police in Tokyo have arrested eight men alleged to have run a cryptocurrency pyramid scheme that collected 7.8 billion yen (almost $69 million) from thousands of victims across the country. The men had reportedly touted a bogus investment firm called βSenerβ they claimed was be based in the U.S. and collected most of the payments in bitcoin, as well as another 500 million yen (about $4.40 million) in cash.