Hackers behind one of the biggest-ever digital coin heists have now returned almost all of the $610m-plus they stole, the cryptocurrency platform focused this week by the assault says.

The Poly Network platform, which was little recognized earlier than Tuesday’s heist, on Thursday declared the hacker on Twitter to be a “white hat”, referring to moral hackers who typically goal to show cyber vulnerabilities, upon the return of the funds.

Poly Network, which facilitates peer-to-peer token transactions, added that the tokens have been transferred to a multi-signature pockets managed by each the platform and the hacker.

The solely remaining tokens but to be returned are the $33m in tether stablecoins frozen earlier within the week by cryptocurrency agency Tether, Poly Network stated.

“The repayment process has not yet been completed,” Poly Network stated on Twitter. “To ensure the safe recovery of user asset, we hope to maintain communication with Mr. White Hat and convey accurate information to the public.”

An individual claiming to have perpetrated the hack stated Poly Network provided him a $500,000 bounty to return the stolen belongings and promised that he wouldn’t be accountable for the incident, in accordance with digital messages shared on Twitter by Tom Robinson, the chief scientist and co-founder of Elliptic, a crypto monitoring agency.

Poly Network, which permits customers to switch or swap tokens throughout completely different blockchains, stated on Tuesday it had been hit by the cyberheist and urged the culprits to return the stolen funds.

The nonetheless as-yet-unidentified hacker or hackers seem to have exploited a vulnerability within the digital contracts Poly Network makes use of to maneuver belongings between completely different blockchains, in accordance with blockchain forensics firm Chainalysis.

On Wednesday, the hackers began returning the stolen cash, main some Blockchain analysts to take a position that they may have discovered it too tough to launder stolen cryptocurrency on such a scale.

Later on Wednesday, the hackers stated in digital messages additionally shared by Elliptic that they’d perpetrated the assault “for fun” and needed to “expose the vulnerability” earlier than others might exploit it and that it was “always” the plan to return the tokens.

At $600m, nevertheless, the Poly Network theft far outstripped the document $474m in legal losses that have been registered by the whole decentralised finance (DeFi) sector from January to July, in accordance with crypto intelligence firm CipherTrace.

The theft illustrates the dangers of the principally unregulated DeFi sector, crypto specialists say. DeFi platforms permit customers to conduct transactions, often in cryptocurrency, with out conventional gatekeepers corresponding to banks or exchanges.

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