Hacker behind $600 million crypto heist claims they did it ‘for fun’
A person claiming to be the hacker behind one of the biggest cryptocurrency heists of all time says they stole the funds “for fun.”
More than $600 million worth of crypto was stolen in the cyberattack, which targeted a decentralized finance platform called Poly Network.
Decentralized finance — DeFi, for short — is a fast-growing space within the crypto industry that aims to reproduce traditional financial products like loans and trading without the involvement of any middlemen.
While it has attracted billions of dollars in investment, the DeFi space has also given rise to new hacks and scams. For example, a token backed by billionaire investor Mark Cuban recently dropped from $60 to several thousandths of a cent in an apparent “bank run.”
Poly Network is a platform that looks to connect different blockchains so they can work together. A blockchain is a digital ledger of transactions that’s maintained by a distributed network of computers, rather than a central authority.
On Tuesday, a hacker exploited a flaw in Poly Network’s code which allowed them to steal the funds. According to researchers at blockchain security firm SlowMist, Poly Network lost more than $610 million in the attack.
Poly Network then pleaded with the hacker to return the money and, sure enough, nearly half of the crypto haul was returned by Wednesday.
In a Q&A embedded within a digital currency transaction Wednesday, a person claiming to be the anonymous hacker explained their reasoning behind the hack — “for fun.”
“When spotting the bug, I had a mixed feeling,” the person said. “Ask yourself what to do had you facing so much fortune. Asking the project team politely so that they can fix it? Anyone could be the traitor given one billion!”
“I can trust nobody!” they continued. “The only solution I can come up with is saving it in a _trusted_ account while keeping myself _anonymous_ and _safe_.”
The person also gave a reason for why they returned the funds, claiming: “That’s always the plan! I am _not_ very interested in money! I know it hurts when people are attacked, but shouldn’t they learn something from those hacks?”
Tom Robinson, chief scientist at blockchain analytics firm Elliptic, said the person writing the Q&A was “definitely” the hacker behind the Poly Network attack.
“The messages are embedded in transactions sent from the hacker’s account,” Robinson told CNBC. “Only the holder of the stolen assets could have sent them.”
CNBC could not independently verify the authenticity of the message and the hacker, or hackers, have not been identified. SlowMist said its researchers had tracked down information on the attacker’s IP and email information. In the Q&A, the hacker claimed they took care to ensure their identity was “untracable.”
Mike Intrator, co-founder and CEO of CoreWeave, speaks at the Nasdaq headquarters in New York on March 28, 2025.
Michael M. Santiago | Getty Images News | Getty Images
CoreWeave shares fell about 6% in extended trading on Tuesday even as the provider of artificial intelligence infrastructure beat estimates for second-quarter revenue
Here’s how the company did in comparison with LSEG consensus:
- Earnings per share: Loss of 21 cents
- Revenue: $1.21 billion vs. $1.08 billion expected
Revenue more than tripled from $395.4 million a year earlier, CoreWeave said in a statement. The company registered a $290.5 million net loss, compared with a $323 million loss in second quarter of 2024. CoreWeave’s earnings per share figure wasn’t immediately comparable with estimates from LSEG.
CoreWeave’s operating margin shrank to 2% from 20% a year ago due primarily to $145 million in stock-based compensation costs. This is CoreWeave’s second quarter of full financial results as a public company following its IPO in March.
CoreWeave pointed to an expansion in business with OpenAI, a major client and investor. Also during the quarter, CoreWeave acquired Weights and Biases, a startup with software for monitoring AI models, for $1.4 billion.
In May, management touted 420% revenue growth, alongside widening losses and nearly $9 billion in debt. The stock still doubled anyway over the course of the next month.
CoreWeave shares became available on Nasdaq at the end of the first quarter, after the company sold 37.5 shares at $40 each, yielding $1.5 billion in proceeds. As of Tuesday’s close, the stock was trading at $148.75 for a market cap of over $72 billion.
A CoreWeave data center project with up to 250 megawatts of capacity is set to be delivered in 2026, the company said in the statement.
Executives will discuss the results and issue guidance on a conference call starting at 5 p.m. ET.
This is breaking news. Please check back for updates.
WATCH: Citi’s Tyler Radke’s bullish call on CoreWeave, upgraded to buy
U.S. President Donald Trump (L) invites Nvidia CEO Jensen Huang to speak in the Cross Hall of the White House during an event on “Investing in America” on April 30, 2025 in Washington, DC.
Andrew Harnik | Getty Images
The Trump administration is still working out the details of its 15% export tax on Nvidia and AMD and could bring deals of this kind to more companies, the White House’s Karoline Leavitt said Tuesday.
“Right now it stands with these two companies. Perhaps it could expand in the future to other companies,” said Leavitt, the White House’s spokesperson.
“The legality of it, the mechanics of it, is still being ironed out by the Department of Commerce, and I would defer you to them for any further details on how it will actually be implemented,” she continued.
President Donald Trump confirmed on Monday that he had negotiated a deal with Nvidia in which the U.S. government approves export licenses for the China-specific H20 AI chip in exchange for a 15% cut of revenue. Advanced Micro Devices also got licenses approved in exchange for a proportion of its China sales, the White House confirmed.
“I said, ‘If I’m going to do that, I want you to pay us as a country something, because I’m giving you a release,'” Trump said Monday.
“We follow rules the U.S. government sets for our participation in worldwide markets,” Nvidia said in a statement this week.
Trump said the export licenses for AMD and Nvidia were a done deal. But lawyers and experts who follow trade have warned that Trump’s deal may be complicated because of existing laws that regulate how the government can charge fees for export licenses.
The Commerce Department didn’t immediately return a request for comment.
The H20 is Nvidia’s Chinese-specific chip that is slowed down on purpose to comply with U.S. export relations. It’s related to the H100 and H200 chips that are used in the U.S., and was introduced after the Biden administration implemented export controls on artificial intelligence chips in 2023.
Earlier this year, Nvidia said that it was on track to sell more than $8 billion worth of H20 chips in a single quarter before the Trump administration in April said that it would require a license to export the chip.
Trump signaled in July that he was likely to approve export licenses for the chip after Nvidia CEO Jensen Huang visited the White House.
The U.S. regulates AI chips like those made by Nvidia for national security reasons, saying that they could be used by the Chinese government to leapfrog U.S. capabilities in AI, or they could be used by the Chinese military or linked groups.
The Chinese government has been encouraging local companies in recent weeks to avoid using Nvidia’s H20 chips for any government or national security-related work, Bloomberg reported on Tuesday.
WATCH: Access to Nvidia’s H20 won’t hand China an AI advantage: Analyst
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