North Korean hackers steal $1.5B in cryptocurrency from the Dubai-based exchange Bybit.Over 400,000 ethereum and staked ethereum coins were transferred from Bybit's cold wallet to hot wallets controlled by the attackers.The attackers manipulated the smart contract logic and signing interface, bypassing multisig cold wallet security.The hack exposes the vulnerability of the human element in crypto security, requiring the industry to focus on end-to-end prevention.