Ethereum co-founder Vitalik Buterin is voicing deep concerns over the future of online privacy as Worldcoin, the digital ID project backed by Sam Altman, continues to expand globally.
In a new essay published today, Buterin critiques the model behind Worldcoin, which is built on verifying individuals through biometric data, namely eye scans. The project claims over 13 million unique verifications so far, using devices called “Orbs” to scan irises and issue World IDs along with WLD tokens. Although Worldcoin says it uses zero-knowledge proofs (ZK) to protect user data, Buterin warns that the system’s very architecture—built around a single, persistent identity—could severely undermine anonymity on the internet.
He points out that even privacy-preserving technologies like ZK can’t fully mitigate the risk of consolidating one’s entire digital footprint under a single identifier. This, he argues, could strip users of the ability to operate multiple online personas—a freedom that has long been part of internet culture and is essential for privacy, safety, and freedom of expression.
The Ethereum creator also noted that similar ID models are already being embraced in places like the European Union and Taiwan, a trend he sees as accelerating worldwide. While these tools may help combat spam, fake accounts, and bot manipulation, Buterin emphasized the danger in standardizing identity in such a rigid, singular way.
Meanwhile, Worldcoin continues to move ahead. The project is expanding its presence in the U.S., testing integrations with platforms like Tinder in Japan, and even preparing to launch a Visa card linked to user identities.
Buterin’s main proposal is a shift away from one-size-fits-all solutions. He advocates for a more decentralized, pluralistic approach—where users can maintain different identities across platforms, verified by a variety of institutions rather than a central authority.
Alexander Stefanov
Reporter at Coindoo
Alex is an experienced finance journalist and a cryptocurrency and blockchain enthusiast. With over 8 years of experience covering the crypto, blockchain and fintech industries, he deeply understands the complex and constantly evolving world of digital assets. His insightful and thought-provoking articles provide readers with a clear picture of the latest developments and trends in the market. His passionate approach allows him to break down complex ideas into accessible and insightful content. Follow up on his content to be up to date with the most important trends and topics.
Source: https://coindoo.com/ethereum-founder-raises-concerns-over-sam-altmans-worldcoin/