White Hat Unlocks $2M ETH Trapped in 2016 HongCoin ICO

Darius Baruo

Jun 01, 2026 02:25

A white-hat developer recovered $2M in ETH stuck since 2016 in a failed ICO smart contract, highlighting early Ethereum vulnerabilities.

Nearly a decade after its initial promise as a decentralized venture capital fund, HongCoin investors are finally seeing their money again. On May 31, 2026, a pseudonymous white-hat hacker known as “0xFlorent” successfully recovered $2 million worth of Ether (ETH) trapped in the project’s faulty smart contract since its 2016 ICO.

HongCoin, launched during the ICO boom of 2016, aimed to be a community-driven fund governed by a decentralized autonomous organization (DAO). However, the project failed to reach its funding goal, leaving 1,003 ETH from 48 investors locked in its smart contract. A bug in the refund mechanism rendered investors unable to reclaim their funds, effectively shelving the project and its token for years.

According to 0xFlorent, the breakthrough came from exploiting an overlooked admin function in the smart contract. “The way out was an admin function with an integer overflow vulnerability,” they explained. By resetting token balances and triggering the refund mechanism, the funds were finally unlocked. Ethereum block explorer data reveals that at least two investors have already received refunds, including one who recovered 96 ETH (approximately $192,500 at current valuations).

This recovery marks one of the rare instances where a white-hat exploit has been used to return funds from a failed 2016 ICO. Early Ethereum projects like HongCoin often suffered from immature smart contract designs, leaving vulnerabilities that could lock up or lose investor funds entirely. The incident underscores the experimental and, at times, precarious nature of the early crypto fundraising period.

HongCoin’s ICO ran from August 29 to October 28, 2016, promising investors 250 million HONG tokens in exchange for ETH contributions. However, when the funding goal wasn’t met, the smart contract’s built-in refund feature failed, leaving investors in limbo. With no active market for the token and no resolution for years, most wrote off their investments.

For 0xFlorent, this isn’t the first time they’ve recovered lost crypto. Just days earlier, on May 24, they retrieved 19.33 ETH (about $40,600) from another failed ICO project and a user’s stuck cross-chain transfer. Their actions highlight the importance of auditing older smart contracts, as vulnerabilities continue to surface years after deployment.

While HongCoin itself holds no trading value today, the recovery of investor funds brings closure to a nearly decade-long saga. It also serves as a reminder of the lasting consequences of flawed smart contract design during the ICO era. For newer projects, it’s a cautionary tale: proper auditing and robust refund mechanisms are essential to earning investor trust and ensuring long-term viability.

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