Harmony’s native ONE token has suffered a major security crisis after an attacker allegedly minted roughly 4 billion unauthorized ONE tokens, triggering a sharp sell off and sending the cryptocurrency down about 26% to 30%. The unauthorized mint represents roughly 26% of the existing ONE supply, creating severe dilution concerns for holders and raising fresh questions about the security of the Harmony blockchain. CoinDesk reported that Harmony confirmed the incident and said it is working with cryptocurrency exchanges to freeze affected funds while preparing a software patch and possible blockchain rollback.
4 Billion ONE Tokens Allegedly Minted
According to onchain analysis cited by Juiceberg, the attacker created approximately 4 billion ONE tokens without authorization. The scale of the mint makes the incident particularly serious because the newly created tokens represent around 26% of the existing supply, potentially creating enormous selling pressure and diluting the holdings of legitimate Harmony ONE investors.
The attacker has reportedly moved about 2.8 billion ONE tokens toward cryptocurrency exchanges, according to the on-chain analysis. Only around 115 million ONE reportedly remains onchain under the attacker’s control, while the majority of the unauthorized supply has either been sold or moved into exchange wallets. That movement has increased concerns that additional selling could put further pressure on the ONE token price.
The rapid movement of the newly minted Harmony ONE tokens has also made exchange monitoring a critical part of the response. If exchanges can identify and freeze the affected wallets before more unauthorized ONE reaches the open market, they could limit the potential impact of the exploit. However, funds that have already changed hands or entered trading markets could make recovery considerably more complicated.
Harmony Confirms Exploit and Prepares Rollback
Harmony has confirmed the security incident and said it is working with cryptocurrency exchanges to freeze the affected funds. The blockchain project is also preparing a software patch designed to address the vulnerability behind the unauthorized token creation. Harmony has indicated that it is evaluating rollback options as part of its response.
A potential blockchain rollback would represent a significant intervention because it could allow Harmony developers to reverse transactions associated with the exploit and restore the network to a state before the unauthorized mint. Such a decision would require careful coordination with validators, exchanges, applications and users because reverting blockchain activity can create major operational and trust implications.
The incident also adds another serious security event to Harmony’s history. In 2022, attackers stole approximately $100 million from Harmony’s Horizon Bridge, while a separate 2023 software bug improperly generated roughly 146.3 million ONE tokens. The latest incident therefore places renewed attention on Harmony’s blockchain security, token supply controls and ability to prevent unauthorized token creation.
ONE Token Faces Further Selling Pressure
The immediate market reaction has been severe, with Harmony’s ONE token falling roughly 26% in Asian trading and other market trackers showing losses approaching 30%. The sharp decline reflects investor concerns that billions of unauthorized tokens could continue reaching exchanges and increase available supply far beyond normal market demand.
The key issue for ONE holders now centers on whether Harmony can stop the unauthorized tokens from circulating and successfully repair the underlying vulnerability. Exchange freezes, a software patch and a potential rollback could reduce the damage, but the final outcome will depend on how much of the minted supply has already been sold, where the remaining tokens are located and whether exchanges can prevent further deposits and trading.
For the wider cryptocurrency market, the Harmony exploit highlights the continuing risks associated with blockchain vulnerabilities and unauthorized token minting. A sudden increase in token supply can rapidly destroy market confidence, especially when attackers move large balances toward exchanges. Until Harmony completes its investigation and announces a definitive recovery plan, ONE holders face continued uncertainty over the token’s supply, liquidity and future price stability.
