The hacker behind the attack on the Chinese cross-chain protocol Poly Network provided the key to the multisig wallet and returned the remaining $141 million of stolen funds.
Dear «Hacker»,
Thank You! We are ready for a new journey.
Poly Network Teamhttps://t.co/djwsVJRXrN
— Poly Network (@PolyNetwork2) August 23, 2021
In a comment on the transaction, the hacker explained the delay of the final payout by the freezing of around $33 million in USDT. He added that the problem with Tether lies in excessive centralisation.
— Wu Blockchain (@WuBlockchain) August 23, 2021
The hacker also said that he transferred to the multisig wallet the reward sent by the Poly Network team amounting to 160 ETH (about $500 000) and donations received from the crypto community. He asked the company to distribute these funds among the victims.
Overall, the hacker described what happened as “one of the craziest adventures of his life” and signed off as “chief security adviser.”
In August, Poly Network suffered the largest-ever attack on the Ethereum, Binance Smart Chain and Polygon blockchains. The total damage amounted to $611 million across various cryptocurrencies. Some of the stolen funds in USDT were blocked.
On August 11 the hacker stated his intent to return the funds. He transferred to the project team all stolen assets except $33 million in USDT, which Tether froze after the attack. A portion of the reimbursed funds was held on the multisig wallet, the keys to which were controlled by both sides.
Earlier, Poly Network developers published a roadmap for returning the funds and announced the launch of a bug-bounty program to search for bugs in the protocol’s core functions.
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