How do smart contracts stay secure on the blockchain?

12 Tem 12:56

Smart contract security requires much more than just blockchain's immutable structure. At its core, the fact that the code can't be tampered with and is visible to everyone forms the first line of defense against fraud. But let’s not forget: Who wrote the code uploaded to a blockchain? How do we prevent unauthorized access? This is where "security layers" come into play. For example, subjecting code written in Solidity or another language to automated tests is the first step in protecting against common vulnerabilities (like reentrancy attacks). Additionally, I believe launching projects without the signature of third-party audit firms (such as Chainalysis or CertiK) is a major risk factor. But is neutrality in the code enough? Absolutely not. Smart contract security isn’t just about the code; the stability of the underlying blockchain is also crucial. For instance, a bug on Ethereum could wreak havoc across the entire network, while on a high-speed network like Solana, skipped verification steps due to speed can be exploited. This is where advanced techniques like "formal verification" come into play—a luxury that most startups can’t afford. From my experience, however, a simple yet effective approach always wins: having the code reviewed by at least three different experts and, if possible, applying "defensive programming" principles. This way, you avoid everyday mistakes while ensuring stability in future updates.