An elite North Korean hacking group stole $6.3 billion from Binance, renewing scrutiny of cryptocurrency exchanges' security controls. Binance's initial investigation says the October 29 theft took minutes after months of preparation. Cybersecurity experts questioned whether exchanges adequately protect employees and restrict attackers who compromise an employee's computer or credentials. Chainalysis says major cryptocurrency hacks have caused more than $22.3 billion in losses since 2021. US cryptocurrency exchanges face differing state requirements rather than a single federal cybersecurity framework.