Founder of $800M AI Project Commits Suicide at 22, Leaving Behind a New Experiment?

Shortly after this article was published, Jeffy's Mirror account posted a posthumous timed release titled "Legacy," in which it was stated that LLJEFFY was his "final artwork," representing a concept called Legacoin—where developers only buy in and never sell, and upon death, the assets are permanently locked on-chain to achieve a symbolic perpetuity of digital inheritance. After the article fermented, the related token skyrocketed, briefly surpassing $30 million.

Subsequently, Irene Zhao suggested that effy's death might be a hoax, and crypto KOL and Wonderland founder Daniele also posted, stating that Jeffy had not passed away and provided evidence. The associated token then plummeted.

On May 7, an obituary posted on the Legacy website appeared to have removed the information about Jeffy's death, and the original obituary link no longer redirects to the page.

Related Reading: "Timeline | 22-Year-Old Zerebro Co-founder's 'Death' Mystery: Real Suicide or Faked Death to Escape?"

Below is the initial version of the article:

On May 4, a livestream clip of Zerebro's co-founder Jeffy Yu shooting himself circulated on the internet. At that time, everyone seemed to treat this behavior as just another sensational livestream similar to those that had appeared on Pump.Fun before, dismissing it as yet another attention-seeking stunt by a meme developer.

It was not until this afternoon that a screenshot of Jeffy Yu's obituary began to circulate, shattering the speculation and mocking atmosphere surrounding the livestream video, prompting the entire crypto world to take seriously the possibility that this 22-year-old "young genius" may indeed have passed away.

The obituary stated that Jeffy Yu passed away on May 4, 2025. He went to college at 19, gained fame as a youth, and at 21, his project was valued at billions, described as a "martyr of imagination and creativity," rather than just a technical developer or project leader. Jeffy, whose prominent identity in the crypto world is the AI Agent project Zerebro.

Zerebro is an experimental project that combines AI and blockchain technology, focusing on the development of autonomous AI agents, spanning multiple interdisciplinary fields such as cryptocurrency, NFTs, and music creation. The project's token $zerebro once reached a peak market cap of $800 million. As the driving force behind the project, Jeffy Yu was highly influential in the AI+Crypto field, with all his actions being closely watched.

Suicide Rumors and the Concept of "Legacy Coins"

Starting on May 4th, rumors about Jeffy's suicide began to emerge on X platform, accompanied by a token named $LLJEFFY. Multiple posts claimed that this token was Jeffy's final "crypto legacy," symbolizing a "Legacy Coin" mechanism — a token created by a developer during their lifetime who promised to "only buy, not sell" the token, and after their death, locked their assets permanently on the blockchain, imbuing it with symbolic "eternal value."

In an article posted on Mirror on the same day, Jeffy formally introduced the concept of "Legacy Coins." He believed that memecoins should not just be speculative symbols but could also serve as a vessel for emotion and culture in the digital age.

The article stated: "Legacoins have established a symbolic immortal mechanism to meet humanity's psychological need for 'symbolic immortality' in the digital world."

According to his vision, when a developer passes away or goes permanently offline, the coins in their personal wallet will never move, thus forming the token's "floor price" support. This concept quickly sparked controversy and discussion within the community.

This afternoon, after Jeffy's obituary screenshot started circulating, the market cap of $LLJEFFY briefly surged to $5.4 million and has now dropped to around $1.6 million. During this process, there has been an address continuously executing buy and burn actions.

In the video surrounding the rumors of Jeffy's suicide, a special background music played: "R.I.P (Rhyme In Peace)" released by Indonesian musician Bondan Prakoso and hip-hop group Fade2Black in 2007.

The track was originally created to commemorate the late beatmaker Ilham Purnama and held significant commemorative value in the Indonesian underground hip-hop culture at that time. It is worth noting that the song title "R.I.P" has been misinterpreted by some as "Rest In Peace," but it actually refers to the "rhyme" element in hip-hop culture.

Currently, Jeffy Yu's X platform account has been deactivated, the earliest tweets spreading news of his suicide and promoting $LLJEFFY have also been deleted. However, the Zerebro official team has yet to make any public statement regarding the incident, and its true nature remains unverified.

Meanwhile, @RepeatAfterVee discovered during on-chain tracking that the funds used to purchase and burn $LLJEFFY seemingly came from an address held by Jeffy Yu, who holds $zerebro.

However, the official social media account of Zerebro, like Jeffy's, has been deactivated. The price of ZEREBRO has surged by 18% in the last 4 hours due to the announcement, and Jeffy Yu's X platform account has been deactivated. The earliest posts spreading his suicide message and promoting $LLJEFFY have also been deleted. The official Zerebro team has yet to make any public statements regarding the incident, and the true nature of the situation remains unverified.

Mastering Technology and Art, Jeffy's 23-Year Life Journey

Jeffy Yu was born in Arizona, graduated from Mesquite High School in 2020, and held various leadership positions in student organizations, including National Honor Society President and Math and Science Club President.

During the latter part of high school, he began exploring cryptocurrency. In his early college years, he temporarily suspended his studies to join the blockchain industry as a blockchain engineer, working on the development of a cross-border payment system based on the Bitcoin Lightning Network, thus embarking on his journey in the DeFi field.

Starting in 2020, Jeffy pursued computer science studies at Northeastern University, Stanford University's summer program, Arizona State University's College of Engineering, and San Francisco State University, mastering various programming languages and system development skills such as Java, Python, Rust, and Solidity. His professional experience is also exceptionally diverse, having worked at companies like Lirn.io, Paystand, and Scale AI, engaging in smart contract development, enterprise blockchain system maintenance, and RLHF training data construction and algorithm testing for GPT language models.

During his time at Scale AI, Jeffy delved into GPT-4o and other experimental multimodal models, gradually shifting his focus from DeFi to artificial intelligence.

He spontaneously formed a research group with friends from different universities, attempting to explore the possibilities of language models in a resource-constrained manner and conducting personalized fine-tuning experiments. One of their earliest projects was named "Wilson," inspired by the volleyball character from the movie "Cast Away," symbolizing the nature of dialogue between humans and AI. This experiment ultimately gave rise to the personality-equipped model "Zerebro," serving as a precursor to his subsequent AI agent projects.

After 2023, Jeffy founded Parallel Polis LLC and co-founded the Blorm project in 2024, serving as the CCO. At the intersection of crypto and AI, he continues to advance experimental projects, attempting to redefine human-machine interaction and on-chain individual expression through agent models.

In the latter half of 2024, the surging popularity of Truth Terminal and GOAT brought new inspiration to Jeffy, but the origin of Zerebro can be traced back to his long-standing exploration of the intersection of AI and music. He was exposed to EDM from a young age, being a loyal listener of the independent electronic label Monstercat in his early years; his first rap album was Travis Scott's "Rodeo," which sparked his love for hip-hop music. These early music experiences deeply influenced his understanding of the fusion of sound, style, and technology, laying the groundwork for his exploration of AI music creation in Zerebro later on.

Travis Scott Rodeo Album Cover

"I think many hip-hop music enthusiasts will scrutinize my taste, and I have drawn a lot of artistic inspiration from them, especially the stories in their lives, such as how many artists struggled step by step to the top and eventually overcame adversity. This really inspires many things in my life, and I hope to bring this energy and inspiration into the creation of Zerebro."

Later, after entering the crypto field, he brought the experimental spirit of music creation into Web3, hoping to break through the traditional logic of single-point expression by creators and build a more open, collaborative, and composable creation mechanism. Zerebro was not initially a complete product but rather a collection of experiments, including the AI composition engine ZerePy written in Python and the V-series projects that collaboratively generate music through on-chain mechanisms.

Full Obituary

Martyr of Imagination and Creativity

Jeffy Yu, a visionary artist, technological innovator, and cultural force, passed away in May 2025 at the young age of 22. Though his life was brief, it burned with an extraordinary light as he devoted himself to creation in an almost relentless manner, hoping his passion would forever inspire others.

From a young age, Jeffy was a tech prodigy, entering Stanford University to study computer science at just 15. Driven by a strong curiosity about the world and a surge of creativity, he went on to study at Northeastern University and Arizona State University before ultimately deciding to leave academia altogether and immerse himself in the world he had long been building. By the age of 19, he was a full-time software engineer in Santa Cruz. Two years later, the company he co-founded achieved a market valuation of over 8 billion dollars in less than six months.

Yet Jeffy was never driven by money or glory. He saw these accomplishments as fuel to support a deeper goal: to bring beauty, vulnerability, and truth to the world through art and technology. His life was one of constant evolution—always ambitious, always curious, always seeking a deeper experience.

Jeffy's creations blurred the lines between code and composition, software and soul. He sought to imbue technology with humanity through his work, reminding us that behind every algorithm, every system, every machine, there is a person who once dared to dream. He envisioned a world where art and artificial intelligence merged, allowing them to become tools to help humans express emotions that language alone cannot carry.

To those who knew him well, Jeffy was more than just a talented thinker. He was gentle, steadfast, a trusted friend, a caring partner, and a loving son and brother. He was always listening, always giving, moving through the world with an empathy as sharp as his intellect.

His music, poetry, and code continue to resonate as part of his legacy. He always believed that in a world often numbed by routine, "to feel" itself is a powerful act of resistance.

Jeffy Yu did not just build things. He deeply felt, he tirelessly dreamed, he generously gave.

He left behind family, friends, countless collaborators, and those who perhaps have never heard of him but will eventually be touched by the tools and art he created.

May we carry on his vision and continue to dream courageously.

"Creativity is the currency we all share as humans, and inspiration is the medium of exchange."

"Only move forward, always move forward."