Lessons from Crypto Exploits

This article surveys major cryptocurrency security failures—SIM-swap account takeovers, a duplicated-withdrawal exploit on Silk Road, Parity multi-sig smart-contract vulnerabilities that led to thefts and frozen funds, and the Ronin bridge compromise tied to North Korea's Lazarus Group—highlighting that a combination of insecure code, rushed deployments, and social engineering have enabled billion-dollar losses. It concludes with practical recommendations including third-party audits, organization-wide security training, multi-factor authentication (preferably hardware keys), secure-coding practices, asset inventory and centralized logging, regular incident-response exercises, and incentives for responsible vulnerability disclosure.