SKN | Harmony Considers Rollback After Suspected Exploit Inflates ONE Supply

Harmony is considering rolling back its blockchain after an alleged exploit reportedly resulted in billions of unauthorized ONE tokens being minted. The layer-1 blockchain said it is working with cryptocurrency exchanges to stop and freeze affected funds while preparing a patch and evaluating rollback options. An X account claimed nearly 2.8 billion ONE tokens were sent to exchanges, contributing to a sharp decline in the token’s price. Harmony has not confirmed the cause of the incident, the exact number of tokens created or the amount transferred to trading platforms.

Harmony Evaluates Blockchain Rollback

Harmony is considering a rollback of its blockchain following claims that an attacker exploited the network to create billions of unauthorized ONE tokens.

The layer-1 blockchain said Tuesday that it was working with cryptocurrency exchanges to stop and freeze funds associated with the incident.

Harmony is also preparing a patch and evaluating potential rollback options as it investigates the suspected exploit.

The project has not confirmed how the alleged attack occurred or provided an official figure for the number of tokens created.

Billions of ONE Allegedly Minted

The response from Harmony followed claims from an X account called “Juiceberg,” which alleged that an attacker minted nearly 4 billion ONE tokens through empty blocks.

If accurate, the alleged issuance would represent approximately 26% of ONE’s total supply, creating substantial dilution pressure for existing token holders.

Juiceberg further claimed that approximately 2.8 billion ONE were rapidly transferred to cryptocurrency exchanges as the token’s price declined.

The account estimated that the attacker retained approximately 115 million ONE onchain, equivalent to about 2.9% of the allegedly minted amount, while the remainder had either been sold or remained in exchange deposit wallets.

These figures have not been independently confirmed by Harmony.

ONE Price Falls Sharply

The suspected exploit triggered significant selling pressure in the ONE market.

At the time of the report, ONE had fallen approximately 33.9% over 24 hours, reflecting the market’s reaction to the alleged unauthorized token issuance and the uncertainty surrounding the blockchain’s response.

A large increase in token supply can create substantial selling pressure if newly issued assets reach exchanges, particularly when market participants are uncertain whether those tokens will ultimately be invalidated through a rollback or other corrective action.

Exchanges Asked to Freeze Funds

Harmony said it was coordinating with cryptocurrency exchanges as it assesses the incident.

The effort could help prevent allegedly unauthorized ONE from being sold or transferred while the blockchain team investigates the source of the abnormal token creation.

The potential rollback introduces another layer of complexity because reversing blockchain activity can affect transactions and users who interacted with the network after the suspected exploit.

Harmony has not yet disclosed whether a rollback will ultimately be implemented or what specific blocks or transactions could be affected.

Incident Revives Harmony Security Concerns

The suspected exploit comes several years after Harmony suffered another major security incident.

In June 2022, the Harmony Horizon Bridge was hacked, resulting in the theft of approximately $100 million in cryptocurrency.

The FBI later attributed that attack to North Korea’s Lazarus Group.

The latest incident is separate from the 2022 Horizon Bridge hack, but the recurrence of a major security event places renewed attention on the security and resilience of Harmony’s blockchain ecosystem.

Rollback Decision Could Have Wider Implications

A rollback would represent a significant intervention because it could potentially reverse blockchain activity to a point before the suspected exploit.

For token holders, exchanges and decentralized applications operating on Harmony, the decision could affect transactions conducted after the point selected for any rollback.

At the same time, allowing unauthorized tokens to remain in circulation could create longer-term supply and market integrity concerns.

Harmony’s decision will therefore need to balance the recovery of the network with the potential disruption caused by reversing transactions.

Closing Insights

Harmony’s consideration of a blockchain rollback highlights the difficult choices that can follow a suspected consensus or token-issuance exploit. While the project is coordinating with exchanges and preparing a patch, key details surrounding the incident remain unconfirmed, including the attack mechanism and the exact amount of ONE allegedly created. The sharp decline in ONE’s price demonstrates the immediate market impact, while the eventual decision on whether to roll back the chain could have broader consequences for users, exchanges and the integrity of the Harmony ecosystem.