Harmony ONE 4B Token Mint Exploit

On August 12, 2026, Harmony, a layer-1 blockchain, confirmed an exploit in which an attacker minted approximately 4 billion ONE tokens without authorization, equivalent to about 26% of the circulating supply. The mint was first reported by on-chain analyst Juiceberg, who noted the tokens were created through empty blocks, bypassing typical alerts. The price of ONE plunged to an all-time low of $0.00057 before recovering to around $0.0008, a drop of roughly 34-40%. Harmony paused its bridges, released a patch to prevent further minting, named four attacker wallet addresses, and asked exchanges to freeze funds. The team is evaluating a potential blockchain rollback, which would erase transactions after the exploit but also legitimate ones. This is Harmony's second major security incident, following the 2022 Horizon Bridge hack attributed to North Korea's Lazarus Group and Lazarus Group. The root cause has not been disclosed, and the total supply endpoint did not immediately reflect the new tokens, complicating tracking. Most of the minted tokens moved to exchanges, with about 97% either sold or in deposit wallets.