Ethereum Foundation and Vitalik Buterin Sued by Former Employee Over Firing

Kayleen Fulton, a former employee of the Ethereum Foundation, launched a lawsuit on November 4 against the organization, Vitalik Buterin, and four additional defendants. Her legal filing claims the Foundation terminated her employment shortly after she revealed a cancer diagnosis and participated in coordinating employee resistance against a mandate-related requirement.

According to documents submitted to the U.S. District Court for the District of Colorado, co-executive director Bastian Aue terminated Fulton on April 6, exactly 13 days after she shared her medical diagnosis. The legal action also contests a directive that forced staff to formally endorse the Foundation’s new mandate.

What Fulton’s Ethereum Foundation Lawsuit Alleges

Fulton links her firing to her diagnosis and staff letter

Fulton’s lawsuit accuses the organization of retaliation, disability discrimination, and breaching her medical leave entitlements, seeking financial damages alongside lost wages.

The complaint connects her dismissal to two distinct occurrences: informing leadership of her cancer and working alongside colleague Trent Van Epps to draft an employee letter addressing the Foundation’s strategic direction. Cointelegraph’s review of the filing notes that 53 individuals signed the letter.

The complaint gives a specific sequence of events

Fulton states she reported her diagnosis on March 24, followed by her and Van Epps’s termination by Aue on April 6 within 30 minutes of each other. Both are named in the filing as the primary organizers of the employee letter.

The timeline of the conflict traces back to a staff directive issued prior to the letter. In late February, the board distributed a draft mandate, setting a deadline for personnel to pledge written adherence. Aue allegedly communicated that failure to comply would be treated as voluntary resignation, though the paperwork provided options to either accept the document or request extra months of leave and compensation.

The day following her medical disclosure, Fulton and Van Epps submitted their letter to the board. While explicitly declining to endorse the mandate, they clarified they were not resigning. The complaint asserts that the signatories supported the broad vision of the text while pushing back against the affirmation terms, ultimately resulting in the unexplained dismissal of the two organizers.

Months after her separation, Fulton initiated the November 4 lawsuit, asking the judiciary to determine whether the Foundation and co-defendants infringed upon her legal protections.

Who Is Named in the Ethereum Foundation and Vitalik Buterin Case?

Fulton worked on protocol support

Within the Ethereum ecosystem, Fulton—widely recognized by her handle “Nixo”—directed the Foundation’s protocol support division. Her responsibilities also included managing All Core Developers, the recurring meetings where engineers deliberate on network upgrades.

Alongside Buterin and the Ethereum Foundation, the lawsuit lists four other individuals as defendants. Fulton maintains that the dismissal was executed by Aue, who served as a co-executive director.

Buterin’s alleged role and the recorded conversation

The filing claims Buterin, acting as a board member, played a part in greenlighting and enforcing the mandate guidelines. It references an audio recording concerning the firings where, as reported by BeInCrypto, Buterin argued that compensating employees for causing an uproar might encourage others to leverage internal or external protests to sway organizational outcomes.

While this recorded comment features prominently in the complaint, it does not officially prove the underlying motivation for Fulton’s termination. The legal system has yet to adjudicate the specific claims regarding Buterin’s involvement and the termination.

The Foundation affiliate’s response

Legal counsel representing Ethereum Asia Pacific Limited—the Foundation’s Singapore-based subsidiary—asserted in a May 14 correspondence that Fulton experienced no unlawful retaliation or misconduct, maintaining that her severance agreement remains fully enforceable.

Cointelegraph reported that requests for comment directed to Fulton, Van Epps, and the Foundation went unanswered prior to publication. Reporting from The Block similarly outlines the complaint’s contents, highlighting the inclusion of the recorded statements involving Buterin.

The Mandate Dispute Behind the Staff Letter

The Foundation set out its mission in a March document

In March, the Foundation published a framework defining its role regarding Ethereum’s evolution. The text prioritized open-source software, privacy, security, and censorship resistance, while concentrating resources on protocol enhancements, research, and developer utilities.

Although the mandate established organizational goals, Fulton’s legal grievance focuses on a narrower conflict: the requirement compelling employees to sign off on the text to maintain employment, and the subsequent staff letter that objected to this condition while endorsing the mandate’s overarching objectives.

The filing details how the mandate evolved from its initial draft. Following an internal vote where 79 staff members favored striking a controversial clause, the board ultimately kept the pledge wording, shifting it into an illustrative graphic rather than keeping it in the main body. Upon its March release, the Foundation framed the mandate as internal guidance rather than a mandatory obligation for the wider Ethereum community.

Staff objected to the requirement and to wording about suicide

Employee objections extended to specific phrasing referencing self-harm with a sword in the event of a mandate violation, according to the complaint. Aue reportedly characterized this text as purely metaphorical to personnel.

As noted in the filing, the 53 signatories of the Fulton- and Van Epps-organized letter backed the mandate’s mission while resisting the mandate to sign it as a condition for retaining their jobs. Their protest targeted the administrative requirement rather than the core objectives.

Ultimately, the core disagreement centered on the interpretation of the pledge and whether mandatory written compliance could be enforced. Fulton ties her termination directly to her organizing role, whereas the associated entity rejects any claims of retaliation.

Why the Lawsuit Matters to Ethereum Staff and Users

The case puts internal governance under scrutiny

The legal action places a spotlight on how the Foundation manages internal dissent regarding its core strategy. Fulton maintains she was penalized for pushing back against workplace mandates while simultaneously navigating a cancer diagnosis and requesting medical leave.

For current staff, the situation prompts critical questions regarding job security tied to mandate compliance and whether opposing administrative rules jeopardizes employment. The corporate affiliate rejects any assertions of unlawful actions or retaliation.

According to the lawsuit, Fulton’s entire team was dissolved, with the majority of the 53 petition signatories having departed the Foundation by September. However, these departures do not inherently prove that either the mandate or the lawsuit caused staff to leave, as other contributors exited during the same timeframe and cited various individual reasons.

The mandate identifies work areas relevant to Ethereum

The Foundation maintains its commitment to fostering Ethereum’s growth, with its March mandate outlining priorities like developer tools, research, and protocol upgrades alongside privacy, security, and censorship resistance.

While the lawsuit highlights the Foundation’s operational relationship with Ethereum’s ecosystem, it centers squarely on internal policies and employment actions. Reports on the litigation indicate no disruption to Ethereum protocols or changes to engineering roadmaps stemming from the complaint. The legal action names specific individuals and entities but does not introduce any market-moving events for ETH.

Ethereum’s native token rose 5% when the mandate debuted in March, later dropping nearly 7% in June following the Foundation’s announcement of a 20% workforce reduction. These historical market fluctuations bear no established connection to the new lawsuit, which introduces employment grievances rather than staffing updates or technical shifts.

What to Watch as the Case Moves Forward

A primary procedural question is whether a Colorado court will retain jurisdiction over the matter. In their May 14 letter, lawyers for the Singapore affiliate insisted Fulton’s separation contract is binding, a claim countered by Fulton, who states she formally rescinded the agreement and refunded the money.

Counsel for the affiliate contend that the severance terms mandate arbitration inside Singapore, a point contested by Fulton’s side. Resolving this jurisdictional hurdle will dictate the preliminary trajectory before any substantive evaluation of the claims occurs.

The opposing legal strategies will dictate the progression of the case, though no timeline has been established for a venue decision, nor has any definitive ruling on the core arguments been issued.

Both parties will need to address Fulton’s assertions regarding her medical leave, the employee petition, the mandate stipulations, and the triggers for the layoffs. The corporate affiliate disputes all allegations of illicit conduct and retaliation, contrasting directly with the narrative laid out in Fulton’s complaint.

The assertions detailed in the complaint remain unproven allegations, and no final judicial determination had been rendered at the time of filing.

?FAQ

01What was controversial about the mandate’s wording?

The filing highlights employee pushback against text mentioning self-harm with a sword in the event of a breach. Although Aue reportedly dismissed the phrasing as figurative, it fueled broader debates regarding forced compliance.

02Why is Vitalik Buterin named as a defendant?

The complaint asserts that Buterin backed and enforced the mandate guidelines in his capacity as a board member, and points to a recorded dialogue where he suggested that rewarding employees for causing public friction sets a dangerous precedent.

03What was Fulton’s role at the Foundation?

She managed the protocol support unit—widely known as “Nixo”—and led the All Core Developers meetings that coordinate upgrades for the Ethereum network.

04How many staff signed the letter Fulton organized?

A total of 53 personnel backed the letter coordinated by Fulton and Van Epps, expressing support for the strategic goals while objecting to mandatory signing as an employment prerequisite.

05What compensation is Fulton seeking?

The complaint requests punitive damages alongside back pay calculated using an annual salary baseline of $195,000, representing plaintiff requests rather than court-ordered awards.

06What is the Foundation affiliate’s position?

Representing Ethereum Asia Pacific Limited, legal counsel denied any unlawful actions or retaliatory measures in a May 14 letter, additionally claiming a binding separation agreement—a point disputed by Fulton, who asserts she returned the funds and canceled the pact.

This article is for information only and is not financial advice.