Harmony protocol posted on August 12 that it is working on a patch and rollback options, responding directly to a researcher who posted that roughly 4 billion ONE was minted without authorization.
Harmony said on August 12 that it is working with its team and appropriate exchanges to stop and freeze funds, following a claim that unauthorized tokens were minted on its network.
Project States Patch and Rollback Options Under Consideration
The statement was posted from the official @harmonyprotocol account on X at 04:26 UTC on August 12 as a quote-post of a claim made by the account Juiceberg. Harmony wrote that it is working with its team and appropriate exchanges to stop and freeze the funds, that it is working on a patch and rollback option, and that it will update when it has new information.
The post does not confirm any figure, does not state when the incident began, and does not name any exchange. Harmony has published no further statement as of publication.
A rollback would reverse transactions recorded on the network after a chosen point. Harmony’s post describes rollback as an option under consideration and does not state that one will occur, nor identify a point from which one would run.
Harmony Publishes Four Wallet Addresses
Harmony published four wallet addresses at 05:25 UTC on August 12 and asked all exchanges to block and freeze funds that trace back to them. The post quoted the project’s earlier statement and added no further detail.
The addresses were listed in both Harmony’s native format and hexadecimal as follows.
- one1uap8dx2z0qsjxqthm5flgcxkeepsz3gsrghnfn
0xe7427699427821230177dd13f460d6ce43014510 - one17u300a40ll5wphd8kj5hktryhdjq3ml9f4phy4
0xf722f7f6afffe8e0dda7b4a97b2c64bb6408efe5 - one1a5hur07z5vtvzhr35zkw8tfqedemkz8t88xgd7
0xed2fc1bfc2a316c15c71a0ace3ad20cb73bb08eb - one1h56hkxmua0uzfv07fu04cudvtrl35u96pq47vy
0xbd357b1b7cebf824b1fe4f1f5c71ac58ff1a70ba
Harmony did not state how much value the addresses hold, when funds moved through them, or which exchanges had been contacted.
Researcher Puts Unverified Figure at 4 Billion ONE
The claim Harmony responded to was posted at 01:42 UTC on August 12. It states that Harmony was exploited, that on-chain data shows an unauthorized mint of 4 billion ONE representing 26% of supply, that 2.8 billion tokens were moved to exchanges as the price fell, and that the network’s totalSupply endpoint does not reflect the additional tokens.
In a follow-up posted approximately three hours later, the same account stated that the attacker has roughly 115 million ONE left to sell on-chain, about 2.9% of the total minted, and that the remainder is already on exchanges and has either been sold or is sitting in deposit wallets. The stated percentage implies a supply denominator of approximately 15 billion ONE.
$ONE Down 38% After Exploit
Harmony protocol token, ONE, traded at $0.0007605 at 6:07 AM UTC on August 12, down 38.33% over the previous 24 hours, according to CoinMarketCap. Market capitalization stood at $11.41 million, down 38.33% over the same period, with 24-hour trading volume up 3,757.35%.
CoinMarketCap listed total supply and circulating supply at 15.01 billion ONE, with no maximum supply. The researcher’s stated figure of 4 billion tokens represents 26.6% of that total.
OKX ONE/USDT five-minute data shows the decline beginning shortly after 01:00 UTC, approximately 30 minutes before the claim was posted at 01:42 UTC.
Following $ONE Crash, Harmony Pauses Bridge & Releases Patch
Harmony published a patch at 06:40 UTC on August 12 and asked all validators to upgrade, stating that the patch prevents any further minting. The project said it will follow up with another update to address the already minted tokens.
In a post published earlier the same day, Harmony said it had paused bridge.harmony.one due to the incident.
Exchange Response Not Yet Confirmed
Harmony’s post states that it is working with appropriate exchanges. No exchange had published a notice on ONE deposits or withdrawals as of publication. The Crypto Times has reviewed the status pages of major venues listing ONE.
Harmony is a proof-of-stake blockchain that launched its mainnet in June 2019. Its native token, ONE, is used for transaction fees, staking, and governance.
In June 2022, an attacker took approximately $100 million in assets from the Harmony-operated Horizon bridge. The project offered a bounty and paused the bridge following the incident and later proposed minting billions of new ONE tokens to reimburse affected users, a proposal that drew opposition on the project’s governance forum.
Updated on August 12, 2026, at 10:27 UTC to add detail on bridge pause and patch release
Also Read: Panther Protocol Hit by Governance Attack, 5.12M ZKP Drained on Base
