$2 Million Ether Rescued — Hacker Cracks 2016 ICO Contract
By John Nada·Jun 1, 2026·4 min read
A white hat hacker unlocks $2 million in Ether from a faulty 2016 ICO smart contract, exposing long-standing vulnerabilities in early blockchain projects.
1,003 Ether. That's the treasure trove a pseudonymous white hat hacker named "0xflorent" unlocked after nearly a decade trapped in a faulty smart contract. According to Cointelegraph, the funds were stuck in a broken refund function of the Hong Coin ICO, a project that never launched due to unmet funding goals.
The ICO, which commenced on August 29, 2016, was envisioned as a decentralized venture capital fund. A YouTube video released at the time portrayed the token as a community-run venture capital fund where members of the project's decentralized autonomous organization would have a say in which projects got backing. However, the ICO ended about two months later, on October 28, without reaching its funding goals, leaving investors in a lurch.
Investors who sent ETH to the HONG smart contract were promised 250 million HONG tokens, to be distributed across five stages. The smart contract was designed to automatically refund investors if the funding target wasn't met. Unfortunately, a bug in the refund function "quietly broke that," according to 0xflorent, and the funds got stuck.
The Ethereum ecosystem has matured significantly since 2016, but stories like the Hong Coin ICO serve as stark reminders of the vulnerabilities that existed in the blockchain's early days. The retrieval of 1,003 ETH, worth approximately $2 million today, is a testament to the technical debt that the ecosystem still grapples with, long after the ICO boom period.
0xflorent's method of exploiting an admin function with an integer overflow vulnerability was key in unlocking the trapped Ether. This precision strike reset token holders' balances and triggered the otherwise dormant refund mechanism. "The way out was an admin function with an integer overflow vulnerability," 0xflorent explained. "Calling it with a specific input resets a holder's balance and unblocks the refund check."
This technical maneuver showcased not only 0xflorent's ingenuity but also highlighted the complex nature of smart contracts, especially those developed during the early years of blockchain technology. It was a clever workaround for a complex blockchain conundrum that had left many investors out of pocket for years.
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So far, data from Ethereum block explorer Etherscan indicates that one HONG investor has already been refunded 96 ETH, now worth about $192,500, while another investor received 0.5 ETH. These recoveries mark the beginning of a broader effort to return funds to all affected investors, a process that may take time but offers hope for those who had written off their investments.
The saga of Hong Coin adds yet another chapter to the annals of crypto history. It serves as a poignant reminder of the forgotten funds that can, with a bit of ingenuity, be resurrected from digital oblivion. This event is emblematic of the broader story of the blockchain industry, where innovation often walks hand in hand with risk and uncertainty.
Beyond the technical triumph, this recovery speaks to the lingering vulnerabilities in smart contracts from the ICO boom era. Many projects launched during this period failed to deliver on their promises, leaving investor capital in limbo. As industry participants sift through the remains of such ventures, stories like this hint at the potential for reclaiming lost assets.
In a related effort, 0xflorent previously retrieved a combined 19.33 ETH worth about $40,600 from a failed ICO project in January 2018 and a Liquality Wallet user who had some funds trapped in a cross-chain transfer protocol. This demonstrates a continued commitment to uncovering and resolving issues in the Ethereum ecosystem, highlighting both the challenges and opportunities that lie in blockchain technology's past.
The rescue of these funds isn't just a win for a few investors; it's a call to the crypto community to remain vigilant and innovative. The blockchain world moves fast, but its history echoes, offering lessons and sometimes, like a phoenix, opportunities for rebirth. It's a reminder that the crypto space is still young, and growing pains are inevitable, but they also pave the way for future advancements.
The Ethereum community, known for its resilience and adaptability, must continue to confront these challenges head-on. By doing so, it can ensure that the mistakes of the past are not repeated and that the potential of blockchain technology is fully realized. As the ecosystem evolves, the lessons learned from events like the Hong Coin saga will undoubtedly contribute to a more secure and robust future for Ethereum and the broader crypto landscape.