According to The Block reporting, on November 4, 2026, former Ethereum Foundation official Kayleen Fulton filed a federal lawsuit in U.S. District Court for the District of Colorado against Vitalik Buterin, the Ethereum Foundation and several executives, alleging wrongful termination, workplace retaliation, disability discrimination and medical leave violations. Fulton was dismissed on April 6 following an internal dispute over the foundation's revised Ethereum Foundation Mandate published March 13.

Fulton organized a March 25 letter signed by 53 employees opposing what signatories described as coercive conditions tied to the mandate. She claims her dismissal retaliated for the collective opposition and occurred less than two weeks after disclosing an ovarian cancer diagnosis on March 24. The complaint cites a May 1 conversation with Buterin in Norway, in which the co-founder allegedly expressed concern that rewarding employees for challenging management could encourage similar disputes. Fulton is seeking lost wages, damages and invalidation of a separation agreement requiring arbitration in Singapore.

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