As more value moves onto decentralized systems, smart contract audits matter more to code security and to blockchain security as a whole. This post explains what smart contract audits are, why they matter, what they help with, and the issues they most often find.
What are smart contract audits?
A smart contract audit is a thorough inspection of blockchain-based contracts. These contracts are self-executing, with the terms of the agreement embedded in code. An audit checks that code for vulnerabilities, inefficiencies or bugs that could compromise the contract’s security or performance.
You can think of it as meticulous proofreading, where every line of code is scrutinized so that problems are caught before they cause damage.
Here at HYDN, we perform both automated and detailed manual assessments of the codebase to uncover bugs and vulnerabilities. We also spend time at the start of the smart contract audit process to gather a deep understanding of a project’s aims and intended usage for the contracts. By doing this, we are able to uncover more vulnerabilities than our competitors by being able to test for real-world attack vectors.
Why are smart contract audits important?
There are three main reasons:
- Security. Smart contracts handle transactions worth millions of dollars, so any vulnerability can result in catastrophic losses. Audits find those weaknesses so they can be removed.
- Trust. Audits increase user trust in decentralized applications (dApps). When users know that a contract has been audited, they are more likely to engage with the platform.
- Compliance. Audits also check that smart contracts comply with the stated rules and regulations, which avoids legal repercussions down the line.
What do smart contract audits help with?
- Bug detection. One of the primary roles of a smart contract audit is to identify and fix bugs in the contract code before deployment.
- Optimization. Auditors check the efficiency of the code. They make sure it does not consume excessive gas (the fee required to conduct transactions and execute contracts on the Ethereum network) and that it runs efficiently.
- Validation. An audit verifies that the contract does exactly what it is supposed to do.
Common issues found during smart contract audits
Several issues come up again and again:
- Reentrancy attacks. A recursive call that lets an attacker drain funds from a contract.
- Integer overflow and underflow. A number exceeds or falls below the maximum or minimum limit, leading to unexpected outcomes.
- Gas limit errors. Contracts that need excessive gas to execute can stall, because they exceed the block gas limit.
- Timestamp dependence. Blockchain timestamps can be manipulated to a small degree, so contracts that rely heavily on them can be exploited.
- Ownership renouncement. Some contracts allow the contract owner to renounce ownership, which can lock funds in the contract forever if it is not implemented carefully.
Conclusion
Smart contracts are becoming a common way of executing agreements across many sectors, and audits are how you find and fix their problems before someone exploits them. That is what lets users trust that a contract will handle transactions reliably.
If you’re looking for an industry leading smart contract audit, get in touch on Telegram, or by filling in our Contact Form.
