Smart contract security

In 2017, $150 million worth of ETH was stolen from an organization named Parity technologies due to a critical vulnerability present in their Ethereum smart contract.
In 2016, a DAO called Genesis DAO was compromised exploiting a security loophole in the system. $50 million worth of ETH from Genesis DAO’s crowdfunding investors were stolen.
In August 2021 Hackers stole $613 million worth of digital currency from a company named Poly Network. They exploited a vulnerability in the digital contracts Poly Network uses, Poly Network exploit.

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