Blockchain Security: Smart Contract Audit

What is a Smart Contract and Audit of Smart Contracts?

Audit of Smart Contracts is a specialized task, which includes a manual and/or an automated in-depth analysis of a source code to identify security-related weaknesses.

A smart contract is a digital protocol created to facilitate, verify, and enforce conditions on the blockchain, thus avoiding the need for a middleman. It sustains the back-end functioning of decentralized systems.

zerOxImpact is a professional team of consultants, who perform smart contract audits in accordance with the internal methodology. We analyse a smart contract’s functionality and perform all necessary checks for all known vulnerabilities. 

Smart Contract Audit protects against threats targeting your business and clients, who do not underestimate this risk, do the independent smart contract review.

We have a huge experience in the area of blockchain. For our clients, we provide security audits of smart contracts, DApp’s – front-end, back-end, custom blockchains, 2nd layer scaling solutions and crypto-wallets.

1. Smart Contract Audit Platform Flexibility

Whether Ethereum, Stellar, NEO, or EOS, our engineers can confidently assist with the audit of your smart contract.

2. Manual Code Review

Our team performs a formal line by line inspection of your smart contract to find any potential issues.

3. Cost-effectiveness

We offer a cost-effective, end-to-end security protection for your crypto product.

    Not enough? move on

    How do you Benefit working with us.

    What other Blockchain Services can you offer?

    Blockchain decentralized application Security Review

    A Decentralized application (DApp) operates its backend code on a decentralized peer-to-peer network.

    DApp security review service focuses on the client- and server- side security issues of applications. A DApp review consists of a smart contract audit of the back-end and “smart” penetration testing of the front-end. A deep-dive pentest checks for any potential server misconfigurations and Cross-Site Scripting (XSS). For DApps with a rich server logic (database, registration forms etc.) full pentest should be performed.

    Contact us for references.

    Blockchain Layer 2 Security Review

    layer 2 architecture and security review is an analysis of the node codebase to discover any unexpected behavior, vulnerabilities or performance issues that could potentially violate the technical requirements.

    Consultants go through the code functionality and logic implementation to check whether the architecture of the application fits the necessary requirements. It also verifies whether the functionality has been implemented in a high-performance and scalable way as well as analyzing for any potential security issues

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    Custom-tailored Blockchain protocol review

    Blockchain protocol security practice consists of 3 different services that cover all security aspects of custom blockchain implementation: protocol model security review, tokenomics review, and protocol implementation security analysis. We can offer to do all kinds of audit: functional and security review of your protocol.

    Contract us for references.

    Some of our clients

    Blockchain Security Smart Contract Audit 1
    Blockchain Security Smart Contract Audit 2
    Blockchain Security Smart Contract Audit 3
    Blockchain Security Smart Contract Audit 4
    Blockchain Security Smart Contract Audit 5
    Blockchain Security Smart Contract Audit 6
    Blockchain Security Smart Contract Audit 7
    Blockchain Security Smart Contract Audit 8
    Blockchain Security Smart Contract Audit 9
    Blockchain Security Smart Contract Audit 10

    Ready to start building up your cyber resilience?​


    Contact us today and find out how our experts can help provide the information security assurances you need.

    What is a Smart contract Audit Methodology?

    Smart Contract Audit is similar to a secure code review, and involves a manual and/or an automated review of an application’s source code to quickly identify security-related weaknesses in the code.
    “Learn more – Manual vs. Automated Secure Code Reviews.”

    Our approach to deliver the service:

    Kickoff meeting:

    Receive the documentation &


    Identify Objectives and Threat Modelling. We want to learn about your application’s use cases. For us it is critical to understand the types of bugs that are possible in the code we’re reviewing.

    The client provides access to the codebase (via the link to the repo, or simply by sending an archive). The team replies with an estimate of the cost and time.

    The team scans the smart contracts with both publicly available and with the proprietary security tools, as well as with the open-source tools. Any issues found by the tools are then validated manually.

    After, the smart contracts are verified manually (this includes the checks for vulnerabilities, code quality, irrational gas consumption, etc.).

    The logic of the contracts is verified and compared with the logic described in the documentation/whitepaper. The smart contracts are then deployed to a Testnet for checking the test coverage (if any). They are also reviewed for compliance, if applicable.

    Conduct initial testing &

    audit of code

    Share a draft audit report 

    with a detailed analysis

    of the contract review

    The report includes a comprehensive description of the found issues along with recommendations on how to fix them.

    The client addresses the issues & bugs of the audit


    Optionally, after the developers update the code, they can perform one free recheck to make sure everything is fixed. After this, they prepare a final retrospective report. Last step is the delivery of the Final Audit Report

    Final testing

    & the re-audit of remediated code


    Frequently Asked Questions.
    Here are some common questions about Smart Contract Audit.

    What is a smart contract audit?

    Smart contract audit is a third-party review of the smart contract code that aims to check the code for all known vulnerabilities and unexpected logic flaws.

    Why do I need a smart contract audit?

    You are going to be successful and your contract will be a sweet target for the hackers! You need a smart contract to secure your and your customers’ funds.

    What is the price of a smart contract audit?

    The cost of the smart contract audit depends on several factors – code size, code quality, quality of tests, etc. After you send us the code for evaluation, we prepare the quote within 1 business day.

    What do I need to do before the audit?

    It’s highly recommended to have a full technical documentation (business requirements), 100% test coverage and the final version of the source code (after QA review).

    Is the audit report public or private?

    Hacken sends you a private report at the end of the audit. After you make the amendments to the found issues, we prepare a final report, which you decide whether it will be public or private. We encourage our customers to publish final reports for better transparency with their customers.

    Do you have any audit report examples?

    Yes, we have, you can see some of them here:

    How long does it take to do an audit of a smart contract?

    The duration of the smart contract audit depends on the complexity of the smart contract code review and on the number of engineers involved. Typically, a smart contract audit takes about 1-2 weeks.

    How do we pay for our audit?

    We accept all major cryptocurrencies, credit cards and wire transfers.

    Can you provide references?

    Absolutely. Our list of satisfied customers grows every day, and each of them is more than willing to be a reference for us. Contact us.