HongCoin investors recover $2M in locked ETH after nine years

Whitehat developer unlocks $2 million stuck in a 2016 Ethereum ICO contract for nine years

Researcher 0xflorent recovered 1,003 ETH (~$2M) trapped in a 2016 ICO contract by exploiting an unpatched integer-overflow in an admin function, with HongCoin's multisig co-signing 41 unlock transactions. Pre-2018 Solidity contracts lack built-in overflow protection — dormant admin functions on legacy deployments are live exploit surface worth auditing.