Cryptocurrency exchange Bitfinex reportedly subpoenaed by top regulator

The Commodity Futures Trading Commission has reportedly issued subpoenas to cryptocurrency exchange Bitfinex and Tether, the company behind a digital coin that claims to track the US dollar. 
Recently, Tether severed its relationship with its auditors. 
Both Bitfinex and Tether, which share a CEO, have come under fire for alleged foul play. The US Commodity Futures Trading Commission has reportedly issued subpoenas to cryptocurrency exchange Bitfinex and Tether, the company behind