Smart Contract Security: 10 Best Practices to Prevent Vulnerabilities

The advent of smart contracts has revolutionised the process of performing digital transactions on the blockchain, including Ethereum blockchain platform. Self-executing code, usually programmed using a programming language such as Solidity, enables the performance of digital transactions without any intermediaries. 

However, due to their immutable nature, they are highly vulnerable to attacks and any attack might lead to irreversible loss of finances. These risks often arise from application-level vulnerabilities, as a result, it becomes necessary to implement high standards of security in the process of smart contract development.

Essentials strategies to follow

1. Keeping Contracts Simple and Modular

One of the major factors that should be considered here is keeping the contracts simple. The usage of complex code increases the chances of vulnerabilities, and thus the contracts must be modular and easy-to-test.

2. Perform a Complete Audit of Codes

Before implementing any smart contract, it is necessary to conduct a complete audit of the code involved in the process. In addition to internal auditing, it is important to get third party auditing services to ensure any underlying issues do not go unnoticed. As seen throughout blockchain history, there has been many high profile hacks which could have been avoided through proper auditing and awareness of the latest cybersecurity threats.

3. Opt for Libraries and Frameworks

It is unnecessary to develop everything from scratch and hence using libraries will be a good choice here. Libraries from OpenZeppelin are highly recommended since they already provide secured and tried and tested components for different uses.

4. Access Control

By prioritizing access control one will be able to prevent any unauthorized access to the network and thereby minimize any possible errors from occurring.

5. Safeguarding Against Re-Entrancy

Re-entrancy is amongst the most common flaws in smart contracts. The reason why re-entrancy arises is that the developer uses the checks-effects-interaction structure of programming. Therefore, it is advisable that you consider safeguarding yourself against this by employing the checks-effects-interactions structure or even re-entrancy guards that ensure the change in state occurs prior to any interaction.

6. Validation of all Inputs

External input cannot be trusted. Therefore, it is prudent that you validate all your inputs. This is essential in handling various problems related to integer overflows, underflows, among others.

7. Safe Arithmetic Operations

Old Solidity had many flaws related to integer overflow and underflows. Even though there have been significant improvements, developers should use safe arithmetic operations.

8. Consider Upgradability in Your Contract Design

The nature of smart contracts is immutable hence cannot be updated after deployment. Developers try to solve this problem using the proxy approach, but then again this introduces complexity and risk but this introduces additional complexity and risk, especially in Smart Contract Development Services. Therefore, before implementing the upgradability approach in your contract, ensure that it is designed safely. 

9. Implement Emergency Stop Mechanisms

Including a “pause” or “circuit breaker” feature allows developers to stop the execution of contracts in case of suspicious activity. This can prevent further damage during an ongoing attack.

10. Test Extensively

Conducting comprehensive testing is of prime importance. Tests like unit tests, integration tests, and even simulated attack scenarios should be intensively conducted. Tools like fuzz testing and formal verification can further enhance confidence in the contract’s security.

Conclusion

The safety of smart contracts is no longer an option; it is a necessity. With each new enterprise that integrates the use of blockchain into its operations, there arises a risk related to the smart contracts that are written improperly. With our Smart Contract Development Services and following proven security practices such as thorough code audits, secure design patterns, and rigorous testing, businesses can significantly reduce the chances of exploits.By following proven security practices such as thorough code audits, secure design patterns, and rigorous testing, businesses can significantly reduce the chances of exploits.

If you're planning a blockchain project or want to audit your existing smart contracts, our Blockchain developers can help you design, develop, and secure your solution with industry-grade best practices.