Poly Network Hack: $610M Stolen, Mostly Returned

In August 2021, the cross-chain DeFi platform Poly Network suffered an exploit where approximately $610 million in various digital assets were stolen across multiple blockchains, though the attacker later returned most of the funds.

The top 3

1. Top 3 Largest Crypto Hacks in History: Poly Network sits among the giants, trailing behind the Ronin Network breach ($625M) and the Wormhole bridge exploit ($326M) in terms of sheer scale and impact on DeFi security.
2. The 'Mr. White Hat' Hacker's Bizarre Negotiation: The anonymous hacker famously communicated via blockchain transaction messages, eventually returning nearly all funds while receiving a $500,000 'bug bounty' reward from the protocol. Mr. White Hat
3. Poly Network's Post-Hack Recovery Strategy: Following the $610 million theft, the protocol implemented a comprehensive security overhaul, including multi-signature upgrades and stricter cross-chain verification, though total value locked never fully recovered. Poly Network

Sources

• Poly Network exploit - Wikipedia
• TRM Tracks the Poly Network Hack as Attacker Communicates in Real Time
• The Poly Network Hack Explained - Kudelski Security Research Center
• Hack Track: An Analysis of Poly Network Hack and Latest Related Events - Merkle Science

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