Key takeawaysHarmony’s ONE token plunged roughly 40% following an apparent exploit that created about 4 billion tokens. Harmony released an emergency software update to prevent further minting and urged network operators to install it immediately. Harmony’s ONE token fell approximately 40% on Wednesday after an apparent exploit reportedly created around 4 billion new tokens. Harmony confirmed the attack and instructed the network operators responsible for maintaining the blockchain to install an emergency software update. Harmony’s software update is intended to close the vulnerability and stop any additional ONE from being created.