Harmony said Wednesday it is working with cryptocurrency exchanges to freeze funds tied to a suspected exploit of its blockchain. The announcement came hours after on-chain researcher Juiceberg reported an unauthorized mint of roughly 4 billion ONE tokens on the network.
ONE fell 32.8% in the 24 hours following the incident, according to CoinMarketCap. The token was trading at $0.000828, with a market capitalization of about $12.4 million.
Juiceberg wrote that the mint was carried out through empty blocks and amounted to about 26% of ONE’s total supply. Juiceberg also said roughly 2.8 billion of the newly created tokens moved onto exchanges as the price fell. It echoes a mechanism seen elsewhere this year: Humanity Protocol lost $36 million in June after attackers used compromised admin access to mint about 100 million extra tokens, sending that token’s price down as much as 90%.
In a post on X quoting Juiceberg’s findings, Harmony’s official account said the company is developing a patch and evaluating rollback options, and will share updates as they become available. Harmony’s own statement did not put a number on the mint or explain how it was carried out.
We are working with our team and appropriate exchanges to stop and freeze the funds.
We are working on a patch and rollback options.
Will update when we have new information. https://t.co/XB0nCwTAyN
— Harmony 💙 (@harmonyprotocol) August 12, 2026
Harmony has not said who is responsible or identified the specific vulnerability that allowed new tokens to be created. As of publication, no blockchain security firm or exchange had issued its own account of the incident.
This is Harmony’s second supply-related security failure since 2022. That year, its Horizon Bridge was drained of about $100 million after attackers compromised a multi-signature wallet that needed only two of five signatures to move funds. Multiple outlets confirmed and covered that hack within hours, and it was later linked to North Korea’s Lazarus Group. The same two-of-five threshold, with no timelock in place, was exploited earlier this year in the $280 million Drift Protocol hack on Solana. This week’s incident is different. Hours after it surfaced, it still rests on one researcher’s on-chain analysis, with no independent security firm or exchange on record.
Harmony’s plan to freeze funds and weigh a rollback suggests the company believes the damage can still be contained. Whether it can will depend on information the company has not yet released, including which wallets received the newly minted tokens and whether exchanges agree to freeze them.
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