Mentioned in This Article
1. A former Ethereum Foundation staffer files suit
Kayleen Fulton, who led the Ethereum Foundation's Protocol Support team and facilitated the All Core Developers calls, has sued the foundation and co-founder Vitalik Buterin in U.S. federal court in Colorado. Her complaint, filed on November 4, alleges that she was fired on April 6, 13 days after she told leadership she had cancer. The defendants had not responded publicly as of November 9.
Every employment detail in this account comes from the complaint and is an allegation, not a finding by a court. The only defense on the record so far is a May 14 letter from counsel for one of the defendants, quoted in the filing, which denied unlawful conduct, economic duress, retaliation and termination in violation of public policy.
2. Who are the defendants in the Ethereum Foundation lawsuit?
The complaint names six defendants. Stiftung Ethereum is the Swiss foundation that operates as the Ethereum Foundation. Ethereum Asia Pacific Limited is a Singapore affiliate on whose behalf Fulton was hired. Two employer-services companies, Lightsource HR Global and Vensure Employer Services, handled hiring, payroll and benefits.
The two individuals are Bastian Aue, then a co-executive director of the foundation, and Vitalik Buterin, who sits on the board of Stiftung Ethereum and is sued in his individual capacity. Buterin is named in five of the suit's 11 claims.
The structure reflects how the foundation employed staff across jurisdictions. Fulton's work product was tied to the foundation's core Ethereum activities, but the legal relationships described in the filing run through an Asian affiliate and outside payroll providers, which is why so many entities appear in the caption.
3. What was the Mandate and the "Source Seppuku License"?
The suit centers on the Ethereum Foundation's Mandate, a statement of the organization's direction that was sent to all staff on February 25. According to the complaint, a draft of the document included a pledge labeled the "Source Seppuku License." Under it, the author, editors and distributors of the text vowed to commit ritual self-harm with a sword if they broke or altered the document.
When staff were later asked to sign a commitment form, one employee asked whether the pledge was meant literally. The complaint says Aue replied that the wording was chosen deliberately but was not meant to be taken literally. Management then revised the form to state that the commitment had nothing to do with literal seppuku.
Staff pushed back on the clause. After a March 2 proposal to remove it, 79 employees backed removal, the complaint says. On March 5, Buterin told staff that the document was still being revised, with major changes planned in the areas drawing the most concern. The final version, published on March 13, kept the pledge as a small image.
4. How does the published Mandate read today?
A check of the version posted on the foundation's website on November 9 found no searchable instance of the word "seppuku." Because the pledge sits in an image in the final text, a text search would not find it in any case. The page does include a speech bubble saying the foundation would fall on its own sword if it failed in its promise to Ethereum.
That detail matters to the dispute because the complaint treats the pledge and the commitment form as the backdrop to the events that followed. Whether the language was symbolic or meant as an enforceable condition of employment is a question the foundation has not addressed in public.
5. What does Fulton say happened in March and April?
On March 20, the complaint says, Aue required staff to commit to the Mandate through a form and warned that failing to submit one would be read as a decision to leave the organization. Fulton had been diagnosed with ovarian cancer on March 19. In an email on March 24, she told leadership about the diagnosis and said she was not requesting leave or an accommodation at that time.
The next day, March 25, Fulton sent a letter on behalf of the Protocol group, which was ultimately signed by 53 members of that group. It said the signatories supported the direction of the Mandate but could not in good faith affirm it under the conditions in which it was being presented. The 53 signatures are a separate count from the 79 employees who backed removing the pledge earlier in March.
According to the filing, Aue fired Fulton by video call on April 6 and said he had lost confidence in her, without giving a reason. Trent Van Epps, the other organizer of the letter, was reportedly dismissed about 30 minutes earlier. Counting from the email on March 24, the dismissal came 13 days after her disclosure, and 12 days after the letter.
6. Which claims does Fulton bring, and what does she want?
The 11 claims include disability discrimination and retaliation under federal and Colorado law, interference with and retaliation for medical leave, and a Colorado claim of aiding and abetting against Aue and Buterin. Fulton seeks back pay, front pay, and compensatory and punitive damages. The complaint does not state a dollar figure.
Naming Buterin personally is the notable choice. Employment suits typically target the employer, so the aiding-and-abetting count is how the complaint reaches individuals who are alleged to have helped carry out the conduct. Courts will decide whether those claims survive any motion to dismiss; nothing in the filing has been tested yet.
7. Why does the timing of the dismissal matter legally?
In employment disputes, the gap between a protected act and an adverse action often becomes a central piece of evidence. Protected acts can include telling an employer about a medical condition or raising a collective concern about working conditions. A short interval between such an act and a firing does not prove retaliation on its own, but plaintiffs commonly cite it to argue that the two events are connected.
Fulton's complaint leans on two intervals: 13 days from her disclosure of the diagnosis to her dismissal, and 12 days from the staff letter to the same date. She also says she did not ask for leave or an accommodation in her March 24 email, yet the complaint includes claims about interference with medical leave. How a court treats that combination is one of the questions the case will raise.
Employers, for their part, typically respond to such claims by pointing to independent business reasons for a termination. In this case, the only account of the reason comes from the complaint, which says Aue cited a loss of confidence and gave no further explanation.
8. What is the role of the core developer calls?
The All Core Developers calls are regular video meetings where the teams building Ethereum's software clients discuss proposed changes, testing and the schedule for network upgrades. A facilitator keeps the agenda, records decisions and makes sure that teams in different time zones can follow the same process.
Fulton's position as head of Protocol Support placed her at the center of that coordination. The foundation does not control Ethereum, which is maintained by independent teams, but it funds and organizes much of the surrounding work. That is why a dispute inside the foundation draws attention across the developer community, even though the lawsuit concerns employment law rather than the network's code.
The complaint also describes Van Epps as the other organizer of the staff letter, and says he was dismissed shortly before Fulton. His account has not been published, and the filing does not claim that he is a party to the suit.
9. What is the status of the case?
As of November 9, the docket showed no filings after the complaint of November 4. The foundation, Aue and Buterin had not responded publicly. The May 14 letter quoted in the complaint came from counsel for Ethereum Asia Pacific, and it denied unlawful conduct, economic duress, retaliation and termination in violation of public policy.
In federal civil cases, defendants generally answer the complaint or ask the court to dismiss some or all of the claims after they are formally served. That means the first substantive statements of the defense are likely to arrive in court papers rather than in public posts.
10. Why does this land on a foundation already under strain?
The foundation laid off 54 employees in June, days after co-executive director Hsiao-Wei Wang resigned. Aue was also a co-executive director at the time of the events in the complaint. The suit therefore adds a legal dispute to a year in which the organization has already seen leadership changes and staff reductions.
The Ethereum Foundation is a nonprofit that funds research and development on the Ethereum network and supports the community of client teams and researchers who maintain it. The All Core Developers calls that Fulton facilitated are the regular meetings where those teams coordinate upgrades, so the role described in the complaint sat at the center of the network's technical coordination.
The layoffs and the resignation of Wang are included here only as context for the organization's recent turnover, and they are not part of Fulton's claims. The complaint concerns what it describes as the handling of the Mandate, her medical disclosure and her dismissal, and it does not allege that those events were connected to the June staff reductions. Any link between the two sets of events would be a matter for the parties to raise in court. Readers should also keep in mind that a complaint presents only the plaintiff's version of events, written to support her legal claims, and that the defendants have a full opportunity to contest each factual statement in it as the case moves forward.
What happens next depends on the defendants' response in court. Readers should treat the account above as one side of a dispute until the defendants file their answers and the court rules on the claims.