Blockchain Capital co-founder Bart Stephens has filed a lawsuit against as-yet-unknown individuals who he says stole $6.3 million in cryptocurrency from him. The attackers used a SIM swap attack to gain access to his crypto wallet, which they then drained of various tokens.The attackers also tried to steal around 80 BTC and 6,500 ETH (currently worth over $12.6 million) from a cold wallet belonging to Stephens, but were thwarted by an email alert sent to Blockchain Capital employee.

Total loss estimated at $6,300,000.