Poly Network (2021)
Poly Network — a decentralized platform where users can exchange and manage digital assets.
On August 10, 2021, hackers were able to access digital assets totaling $600,000,000. In the following days, the hackers returned almost all the money under the pretext that they only wanted to demonstrate the system's vulnerability.
The platform learned its lesson and launched a large-scale bug bounty campaign on its own platform, with rewards of up to $500,000.
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