Unlocking True Fairness in Decentralization: zkMe’s MeID and the Fight Against Sybil Attacks

Unlocking True Fairness in Decentralization: zkMe’s MeID and the Fight Against Sybil Attacks

Sybil Attacks on Blockchain Networks

Despite the numerous advantages of blockchain technologies, one of the threats has been the rise of Sybil attacks. Sybil attacks are a method used by attackers to flood the system with pseudonymous identities they control, allowing them to gain disproportionate influence and manipulate the system for personal gain. In response to this challenge, innovative solutions like zkMe's MeID have emerged to combat Sybil attacks using advanced cryptographic techniques and facial recognition, ensuring "One Face, One DID" for strong anti-bot protection without compromising user privacy.

Sybil attacks can come in many forms, including hindering genuine block additions, inserting malicious blocks, and causing widespread disruption. The attacks utilize two main approaches: direct and indirect. In direct attacks, malicious nodes interact with legitimate accounts to deceive users into verifying fake identities. In indirect attacks, intermediary accounts are used to spread false data, making it challenging to trace the source of the exploit. The primary goal of Sybil attacks is to overwhelm the system with fabricated personas to exert unwarranted control.

zkSync's Airdrop Incident

A recent example highlighting the impact of Sybil attacks is zkSync's controversial token airdrop. Critics argued that the airdrop lacked sufficient anti-Sybil measures, making it highly susceptible to exploitation. The eligibility criteria were reportedly easy for attackers to meet while excluding genuine users. Earlier that day, zkSync said that 695,232 wallets could claim its ZK token airdrop and shared a list of seven eligibility criteria, which it said aims to protect against Sybil attacks — where an entity uses multiple wallets to game crypto airdrops. Despite zkSync's defense that strict measures often exclude legitimate participants, estimates suggest that up to 135 million ZK tokens, worth approximately $52.3 million, could end up in Sybil-controlled wallets. This incident underscores the urgent need for robust anti-Sybil mechanisms to ensure fair and secure token distributions in blockchain networks.

Current Issues in Web3: The Prevalence of Sybil Attacks

Although blockchain networks offer numerous benefits, they are not immune to Sybil attacks. Identifying and preventing these attacks is difficult due to the pseudonymous nature of blockchain addresses. Traditional methods such as KYC (Know Your Customer) can help, but they often compromise user privacy and lead to centralization concerns.

Various crypto projects have implemented anti-Sybil techniques, such as:

  • Eligibility Criteria: Setting rules that exclude addresses with limited operations, minimal balances, or those flagged as Sybil addresses.
  • Transaction Analysis: Identifying addresses funded by the same source, performing similar transactions, or transferring assets within clusters.

However, these methods are not foolproof and detecting Sybil users continues to be a complex task.

Revolutionizing Trust: MeID by zkMe - Your Shield Against Sybil Attacks

zkMe is a pioneer in building zk Identity Oracles for decentralized and anonymous cross-chain credential verifications, ensuring no personal information is processed by anyone but the user. To tackle Sybil attacks, zkMe presents MeID, a disruptive solution that uses advanced cryptographic techniques for robust anti-Sybil and anti-bot protection without compromising user privacy. At the core of zkMe is the innovative concept of "One Face, One DID," where users authenticate their identity through facial recognition to obtain a unique DID. This method hinders bad actors from creating multiple accounts and exploiting the system, ensuring that businesses and communities engage with genuine individuals rather than bots or fraudulent accounts.

Why MeID?

  • Private-by-Design: MeID protects user privacy through full homomorphic encryption, ensuring that no personal information is processed by anyone other than the user.
  • Instant Check: The system allows for quick verification of identity accuracy and effectiveness.
  • Reusable: Once verified, the identity can be used repeatedly across different applications, enhancing convenience and security.

Here’s how it works:

  • User Verification: Users undergo a one-time verification process where their identity is authenticated using advanced cryptographic techniques.
  • Data Protection: No personal information is stored or processed by service providers, eliminating the risk of data leaks and misuse.
  • Interoperability: Verified identities can be used across multiple platforms and applications, ensuring full interoperability and reusability.

This is an introductory video of MeID, explaining how users are privately verified on-chain through decentralized IDs.

An example of adoption by Impossible Finance:

zkMe helps Impossible Finance, a decentralized finance (DeFi) platform, tackle several key challenges by offering solutions with MeID. To maintain integrity and fairness, zkMe's MeID solution enhances user verification to help Impossible Finance prevent users from creating multiple accounts to unfairly influence outcomes or manipulate protocols. MeID ensures each user is unique, effectively addressing this issue as anti-sybil protection.

Beyond preventing Sybil attacks in airdrop events, zkMe’s MeID can be applied to various other Web3 scenarios, including the below:

  • Games and virtual reality applications: In decentralized games and virtual reality, preventing fake identities and bots is vital for maintaining the economy's security and fairness. Without such measures, trading virtual items among players could risk the devaluation of these assets.
  • Social Media Platforms: For decentralized social media platforms in Web3, MeID helps maintain the health and fairness of the platform by preventing fake accounts.


Sybil attacks pose a significant threat to the fairness and integrity of Web3 projects. However, with solutions like zkMe’s MeID, it is possible to effectively combat these unethical practices. By providing a decentralized, private, and reusable identity verification system, zkMe ensures that genuine participants can engage in airdrops and other blockchain activities without compromising their privacy or being mistaken for Sybils. This not only enhances the security of the ecosystem but also fosters greater trust and participation within the crypto community.

Contact Us

Ready to enhance the security and trust of your Web3 project? Contact us at contact@zk.me today to learn more about zkMe and how MeID can benefit your community.

About zkMe

zkMe builds zk Identity Oracles for truly decentralized & anonymous cross-chain credential verifications.

No personal information is ever processed by anyone but the user themselves. Data leaks & misuse by the service provider are impossible; full interoperability & reusability result in a superior ID solution. zkMe’s is the only FATF compliant KYC provider to be fully decentralized, offering a full suite of products from anti-bit/anti-sybil, to KYC and more.

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