Smart Contract Security Analyzer

Smart contracts are self-executing programs on blockchain networks that automatically enforce agreements without intermediaries, forming the foundation of decentralized finance (DeFi). Unlike traditional contracts requiring lawyers and courts, smart contracts execute exactly as coded—which is both their power and their danger. Once deployed, smart contracts are immutable and control real financial assets, making bugs and vulnerabilities catastrophically expensive. The history of DeFi is littered with massive exploits: The DAO hack ($60 million stolen in 2016), Parity wallet bug ($150 million frozen permanently), Poly Network hack ($600 million stolen then returned in 2021), and Ronin Bridge hack ($625 million stolen in 2022). These attacks succeed through various vectors: reentrancy attacks (exploiting functions that call external contracts before updating state), integer overflow/underflow (math errors that manipulate values), access control vulnerabilities (unauthorized users calling privileged functions), front-running (attackers seeing pending transactions and submitting their own first), and flash loan attacks (borrowing massive amounts to manipulate markets within a single transaction). Smart contract analysis involves multiple layers: automated scanning tools (Mythril, Slither, Echidna) that detect common vulnerabilities, manual code audits by security experts who understand subtle attack vectors, formal verification (mathematical proofs of correctness), and economic analysis (game theory examining incentive structures and potential attack profitability). Red flags that indicate higher risk include: unaudited contracts (especially handling large sums), anonymous development teams (no accountability if something goes wrong), complex code (more lines = more potential bugs), newly deployed contracts (less time for vulnerability discovery), high privilege concentration (owner can drain funds), and upgradeable proxies (admin keys can change contract logic). Protective measures include using audited protocols, limiting exposure to any single protocol (don't put your entire portfolio in one DeFi platform), understanding the contracts you're using (read the audit reports), and recognizing that "code is law" means bugs can permanently destroy your funds with no recourse.