{"id":604217,"date":"2026-06-02T03:00:42","date_gmt":"2026-06-02T07:00:42","guid":{"rendered":"https:\/\/ambcrypto.com\/?p=604217"},"modified":"2026-06-02T00:01:58","modified_gmt":"2026-06-02T04:01:58","slug":"1003-62-eth-recovered-after-9-years-how-did-a-whitehat-security-researcher-do-it","status":"publish","type":"post","link":"https:\/\/ambcrypto.com\/1003-62-eth-recovered-after-9-years-how-did-a-whitehat-security-researcher-do-it\/","title":{"rendered":"1,003.62 ETH recovered after 9 years &#8211; How did a whitehat security researcher do it?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">An Ethereum [ETH]-based initial coin offering (ICO) called HongCoin, introduced in 2016, recently made headlines after 1,003.62 ETH was recovered. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">This was made possible with the assistance of Florent, a white-hat security researcher. This was equivalent to $2 million, which had been locked for nine years.\u00a0<\/span><\/p>\n<figure id=\"attachment_604229\" aria-describedby=\"caption-attachment-604229\" style=\"width: 794px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/First-white-hat-exploit-on-Ethereum-.png\"><img decoding=\"async\" class=\"wp-image-604229 size-large\" src=\"https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/First-white-hat-exploit-on-Ethereum--794x1024.png\" alt=\"First white-hat exploit on Ethereum\" width=\"794\" height=\"1024\" srcset=\"https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/First-white-hat-exploit-on-Ethereum--794x1024.png 794w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/First-white-hat-exploit-on-Ethereum--233x300.png 233w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/First-white-hat-exploit-on-Ethereum--768x991.png 768w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/First-white-hat-exploit-on-Ethereum-.png 1048w\" sizes=\"(max-width: 794px) 100vw, 794px\" \/><\/a><figcaption id=\"caption-attachment-604229\" class=\"wp-caption-text\">Source: Florent\/X<\/figcaption><\/figure>\n<h2><strong>What caused the funds to be locked in for nine years?\u00a0<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">For context, investors were expected to receive automatic refunds of their contributions because the project had initially fallen short of its fundraising goal.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> Unfortunately, these repayments could not be made due to a defect in the contract&#8217;s refund mechanism, which essentially locked the money indefinitely. During his investigation of the dormant contract, Florent found an integer overflow vulnerability in an administrator function. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">This vulnerability is typical of early <a href=\"https:\/\/ambcrypto.com\/predictions\/ethereum-price-prediction\/\" target=\"_blank\" rel=\"noopener\">Ethereum<\/a> smart contracts and allows numerical values to wrap around when they surpass their upper limit. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">The researcher was able to avoid the flawed refund condition, reset a holder&#8217;s balance, and regain access to the refund process without stealing or misappropriating any money by carefully crafting a specific input.<\/span><\/p>\n<h2><strong>How did Florent recover the locked funds?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\"> Following a successful recovery method test, the researcher shared the process with the HongCoin team, who subsequently carried out 41 on-chain transactions to unlock the trapped Ethereum. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">As a result, 48 original investors can now reclaim their funds, marking a rare example of a vulnerability being used for a beneficial purpose. <\/span><span style=\"font-weight: 400;\">However, this is not his first recovery of this kind. Florent previously had released 19.329 ETH, or roughly $40,590, from two previous contracts on 24 May.<\/span><\/p>\n<figure id=\"attachment_604230\" aria-describedby=\"caption-attachment-604230\" style=\"width: 1024px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/unlocked-19.329.png\"><img decoding=\"async\" class=\"wp-image-604230 size-large\" src=\"https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/unlocked-19.329-1024x982.png\" alt=\"unlocked 19.329\" width=\"1024\" height=\"982\" srcset=\"https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/unlocked-19.329-1024x982.png 1024w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/unlocked-19.329-300x288.png 300w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/unlocked-19.329-768x737.png 768w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/unlocked-19.329.png 1176w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption id=\"caption-attachment-604230\" class=\"wp-caption-text\">Source: Florent\/X<\/figcaption><\/figure>\n<p><span style=\"font-weight: 400;\">The first involved a failed ICO in January 2018 that involved 5.141 ETH and an unnamed public refund function. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">The second involved a Liquality Wallet user who claimed to have refunded 14.190 ETH from seven expired atomic swaps on the user&#8217;s behalf after Liquality shut down its app in 2024.<\/span><\/p>\n<h2><strong>ETH&#8217;s market dynamics<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">At the time of writing, ETH was trading at $1,982.30, down 1.85% over the previous day and more than 13% over the previous month.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">On the contrary, Ethereum&#8217;s Spot Taker CVD (Cumulative Volume Delta) has been primarily fluctuating between aggressive buying and selling streaks in 2026, indicating a fiercely competitive market.<\/span><\/p>\n<figure id=\"attachment_604233\" aria-describedby=\"caption-attachment-604233\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-scaled.png\"><img decoding=\"async\" class=\"wp-image-604233 size-full\" src=\"https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-scaled.png\" alt=\"Ethereum Spot Taker CVD(Cumulative Volume Delta, 90-day)\" width=\"2560\" height=\"1440\" srcset=\"https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-scaled.png 2560w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-300x169.png 300w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-1024x576.png 1024w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-768x432.png 768w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-1536x864.png 1536w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-2048x1152.png 2048w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-1600x900.png 1600w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-1280x720.png 1280w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-960x540.png 960w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-640x360.png 640w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-320x180.png 320w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-160x90.png 160w, https:\/\/ambcrypto.com\/wp-content\/uploads\/2026\/06\/Ethereum-Spot-Taker-CVDCumulative-Volume-Delta-90-day-1200x675.png 1200w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/a><figcaption id=\"caption-attachment-604233\" class=\"wp-caption-text\">Source: CryptoQuant<\/figcaption><\/figure>\n<p><span style=\"font-weight: 400;\">The press time data suggested that although buyers may still be in control, the strength of buying fell in comparison to previous peaks.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> This, after <a href=\"https:\/\/ambcrypto.com\/inertia-exploit-shows-old-erc4626-vulnerabilities-still-threaten-defi-lending-protocols\/\" target=\"_blank\" rel=\"noopener\">AMBCrypto recently revealed<\/a> an exploit that used a well-known ERC4626 vulnerability class to drain about $152,000 from several lending markets.\u00a0<\/span><\/p>\n<hr \/>\n<h2><span style=\"font-weight: 400;\"><strong>Final Summary<\/strong> <\/span><\/h2>\n<ul>\n<li><em><span style=\"font-weight: 400;\">White-hat security researcher Florent spearheaded the recovery after identifying an integer overflow vulnerability in the administrator function of the contract.<\/span><\/em><\/li>\n<li><span style=\"font-weight: 400;\"><em>48 initial investors can now finally receive their money back as a result of this recovery.<\/em><br \/>\n<\/span><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Recovery revealed how vulnerabilities in early Ethereum-era contracts can occasionally be used ethically.<\/p>\n","protected":false},"author":66,"featured_media":604235,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"footnotes":""},"categories":[32,66,4,20],"tags":[],"class_list":["post-604217","post","type-post","status-publish","format-standard","has-post-thumbnail","category-ethereum-news","category-new-news","category-social","category-trading-view"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>1,003.62 ETH recovered after 9 years - How did a whitehat security researcher do it? - AMBCrypto<\/title>\n<meta name=\"description\" content=\"According to Florent, HongCoin didn\u2019t reach its funding goal but held all the investors&#039; ETH and was supposed to auto-refund them...\" \/>\n<meta name=\"robots\" content=\"index, follow, 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