Vitalik Buterin on Worldcoin Protocol Launch on Optimism Mainnet

In a recent blog post, Vitalik Buterin, the co-founder of Ethereum, expressed his thoughts on Worldcoin’s innovative “digital passport” project. While he acknowledges the potential value of an effective proof-of-personhood system, he raises significant concerns about privacy, accessibility, centralization, and security risks associated with Worldcoin’s approach. In this article, we delve into Buterin’s response, analyzing each concern and suggesting potential solutions for a more robust system.

What is Worldcoin ? 

We wrote a detailed article on Worldcoin’s new token WLD launch.

In summary, Worldcoin is a cryptocurrency project that aims to create a global digital identity system and distribute its own token, WLD, to every human on the planet. Worldcoin aims to create a global financial and identity network that is accessible to everyone, regardless of their location, wealth or status.

Worldcoin uses a novel technology called Orb, which is a helmet-shaped device that scans the iris of the eye to verify a person’s identity. The iris scan is encrypted and stored on the blockchain, creating a unique and secure World ID for each individual.

Here is the summary of 4 major risks that Vitalik Buterin is concerned about :

Vitalik Buterin on Worldcoin Protocol
Vitalik Buterin on Worldcoin Protocol


Privacy Concerns and Iris Scanning

Buterin’s primary concern revolves around privacy issues related to the use of Orbs for iris scanning. While iris scanning provides a unique and secure identification method, it also has the potential to capture sensitive personal information like a person’s sex, ethnicity, and even medical conditions. While the World ID offers a unique way to prove human identity, Buterin warns that capturing iris data could inadvertently reveal sensitive information. Safeguarding user privacy should be a top priority when implementing such technologies.

Accessibility Challenges and Limited Orbs Availability

The accessibility of the World ID system is another major concern raised by Buterin. With a limited number of Orbs available globally, the challenge lies in making World IDs accessible to everyone who wants one. Buterin points out that achieving widespread coverage, where an Orb is within a reasonable distance for all individuals, may prove difficult. This limitation could hinder the system’s scalability and adoption rates.

Centralization Risks and Backdoor Vulnerabilities

Centralization remains a contentious issue in the crypto space, and Buterin is wary of its implications for Worldcoin’s project. The reliance on hardware Orbs creates potential vulnerabilities, as malicious manufacturers could install backdoors into the system, leading to the creation of fake human identities. To combat this, Buterin suggests that Worldcoin should implement measures to distinguish World IDs generated by different manufacturers. This would make it easier to identify and disable any malicious activities originating from specific sources. A transparent and robust auditing process for Orbs could further ensure their integrity.

Security Challenges and Identity Verification

Ensuring the integrity of identity verification is crucial for any proof-of-personhood system. Buterin highlights the risk of fraudulent identities generated through AI-generated photographs or 3D prints of fake people. Additionally, concerns over World ID trading and potential hacking add complexity to the security aspect of the system. Implementing robust security measures is essential to safeguard against such threats.

As states by Vitalik Buterin :

“If proof of personhood is not solved, decentralized governance becomes much easier to capture by very wealthy actors, including hostile governments.”

Collaboration and Building a Resilient System

While recognizing the potential benefits of a proof-of-personhood system, Buterin stresses the need for collaboration and learning from other projects that excel in decentralization, accessibility, and protection against fake users. Teaming up with like-minded initiatives could lead to a more comprehensive and resilient system that addresses the challenges identified.


Vitalik Buterin’s response to Worldcoin’s “digital passport” project sheds light on critical concerns that must be addressed for the system’s success. Privacy, accessibility, centralization, and security remain pivotal areas for improvement. Developing a foolproof solution may take time, but collaboration with other projects and a dedication to addressing these concerns will pave the way for a more inclusive and secure proof-of-personhood system.

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