Harmony Protocol Exploit: 4B ONE Tokens Minted, Price Plunges 30%
Harmony Protocol was hit by a suspected exploit on August 12, 2026, that resulted in the unauthorized minting of approximately 4 billion ONE tokens — roughly 26% of the token’s total supply — according to on-chain analyst Juiceberg. The attack sent ONE’s price down more than 30% as the newly created tokens were funneled through the network and into cryptocurrency exchanges.
How the Exploit Unfolded
On-chain data cited by Juiceberg indicates the exploit involved unauthorized minting of ONE through empty blocks, a technique that allowed the attacker to create tokens without corresponding transactions. The totalSupply endpoint reportedly hid the inflation, making the minting difficult to detect in real time.
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Of the 4 billion ONE created, around 2.8 billion was quickly transferred to cryptocurrency exchanges, where it could be sold for other assets. About 115 million ONE remained on-chain, according to the available data. Harmony has not yet disclosed the exact vulnerability that enabled the minting, nor has it confirmed the final amount involved.
Harmony Asks Exchanges to Freeze Funds
Harmony said it is working with its team and cryptocurrency exchanges to stop and freeze funds linked to the exploit. The project identified four groups of wallet addresses — including both Harmony’s ONE network addresses and Ethereum addresses tied to the movement of funds — and asked exchanges to block transactions traced to those addresses.
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In a post on X (formerly Twitter), Harmony wrote: “We are asking all exchanges to block and freeze funds that traces back to these 4 wallet addresses,” followed by the list of addresses. The team said it is developing a patch to address the underlying issue and is evaluating rollback options, which could allow the network to reverse or restore affected transactions. Harmony has not confirmed whether it will proceed with a rollback, and said it will provide further updates as more information becomes available.
Market Impact and What to Watch
The sudden increase in token supply triggered heavy selling pressure on ONE. The token fell more than 30% as billions of newly minted ONE moved toward exchanges. If a large portion of the remaining tokens is sold, further downside could follow.
This incident adds to a history of security challenges for Harmony. In 2022, the Harmony Horizon Bridge was exploited for about $100 million in cryptocurrency, a hack that was later linked to the Lazarus Group, a North Korean state-sponsored hacking collective. That breach was never fully recovered, and the network has been working to rebuild trust since.
The current exploit raises broader questions about the security of cross-chain bridges and token minting mechanisms. For ONE holders, the immediate concern is whether exchanges will cooperate with Harmony’s freeze request and whether the network will execute a rollback to nullify the unauthorized minting. The project’s response in the coming days will be critical in determining the token’s short-term trajectory.
Disclaimer: This article is for informational purposes only and does not constitute financial advice. Cryptocurrency markets are highly volatile and uncertain. Readers should conduct their own research before making any investment decisions.
