Harmony Prepares Chain Rollback After Forged ONE Tokens Spread Across Network
The blockchain says it will reverse roughly 109,000 transactions following an exploit that produced counterfeit ONE tokens.
Harmony, the layer-1 blockchain known for its cross-chain bridge, has said it plans to roll back its chain after forged versions of its native ONE token spread across the network. The move follows reports that an exploit allowed counterfeit tokens to circulate and interact with the ecosystem’s applications.
According to reporting on the incident, the rollback would erase approximately 109,000 transactions recorded since the exploit began. A chain rollback of that size is a significant technical undertaking. It requires coordination among validators and can disrupt any activity, legitimate or otherwise, that occurred during the affected window.
Details on how the forged tokens were created remain limited in current reporting. Blockchain networks generally rely on validated smart contract logic to mint and track native assets. A breakdown in that logic, or a flaw in bridging or minting code, is a common root cause of this kind of token forgery.
Rollbacks are a blunt but sometimes necessary tool for blockchains facing large-scale exploits. They effectively rewind the ledger to a point before the malicious activity took place. This approach was previously used by other networks after major hacks, though it remains controversial because it conflicts with the immutability principle that underpins most blockchain systems.
Harmony has faced security challenges before. The network’s Horizon bridge was the target of a major hack in 2022 that resulted in the loss of roughly $100 million in assets. That earlier incident already raised questions about the resilience of Harmony’s infrastructure and its approach to securing user funds.
The current situation adds to a pattern of security concerns tied to Harmony. It is not yet clear whether the forged ONE tokens exploit is connected to prior vulnerabilities or represents an entirely new attack vector. Further technical details from the Harmony team would be needed to clarify the mechanism behind the token forgery and confirm the final scope of the rollback.
Sources disagree on this story
This article was published before the reports below were compared. The reporting above stands; what follows is where the published accounts do not agree.
Crypto.news and Cryptopolitan disagree on which shard’s checkpoint block was untouched and on how much ONE was actually forged.
What all sources agree on
- Harmony plans to roll back its blockchain to checkpoints from Aug. 11.
- More than 109,000 regular transactions (109,126) and 315 staking transactions would be discarded under the recovery plan.
- The rollback would use replacement databases rather than an in-place revert.
- Harmony said exchanges, bridges and law enforcement are assisting with the investigation.
- Client version v2026.1.2 has been configured to reject the abnormal block hashes linked to the incident.
- Harmony considered and rejected burning/repairing the forged ONE directly, a blacklist, selective transaction replay, and a full token migration.
Where the reports disagree
1Which block/shard was the untouched checkpoint versus the first forged block
validators would retain shard 0 block 92,730,034 and shard 1 block 94,978,278, both recorded at 11:25:37 p.m. UTC on Aug. 11
The first confirmed forged mint reached shard 0 at block 92,730,036, according to the network.
The block just before it, number 92,730,034 (Shard 1) was never attacked, but it is being rolled back at the same time to prevent any future problems.
What would settle it: Harmony’s on-chain block data and its official incident update specifying per-shard checkpoint and first-forged-block heights.
2Total amount of ONE forged in the exploit
One forged mint wallet moved 2.385 trillion ONE through 477 successful transfers in 106 seconds.
Roughly 4 billion ONE, about 26% of the token’s supply, had been conjured through empty blocks.
What would settle it: Harmony’s on-chain minting data and official incident report quantifying the total forged token supply.
What to make of it
Treat the rollback plan itself, the checkpoint date, and the 109,126-transaction discard figure as established across outlets, but do not rely on any single figure for the exact forged-token total or which shard’s block went untouched until Harmony’s own incident report is checked against the two conflicting accounts.
Market Impact
A rollback affecting roughly 109,000 transactions could unsettle users and developers who transacted on Harmony during the exploit window, even if their activity was unrelated to the forged tokens. Exchanges and wallet providers that support ONE may need to pause deposits or withdrawals while the rollback is implemented, which could temporarily reduce liquidity for the token.
Beyond Harmony itself, the incident may renew scrutiny of security practices across smaller layer-1 networks that have previously suffered bridge or minting exploits. Traders and institutions monitoring counterparty risk in DeFi infrastructure often weigh a chain’s exploit history when assessing exposure, and repeated incidents can weigh on sentiment toward a network’s native token over time.
Harmony’s planned rollback highlights the ongoing security challenges facing smaller blockchain networks. The full scope of the forged ONE token exploit, and its ultimate impact on users, is likely to become clearer as Harmony releases further technical details.
Frequently Asked Questions
What happened on the Harmony network?
Reports indicate forged versions of Harmony’s native ONE token spread across the network following an exploit, prompting the team to plan a chain rollback.
What is a blockchain rollback?
A rollback reverses a blockchain’s ledger to a point before certain transactions occurred, effectively erasing activity recorded during the affected period.
How many transactions would be affected by Harmony’s rollback?
Reporting on the incident cites an estimate of roughly 109,000 transactions that would be wiped out if the rollback proceeds.
Has Harmony faced security incidents before?
Yes, Harmony’s Horizon bridge suffered a major hack in 2022 that resulted in losses of roughly $100 million, raising earlier concerns about the network’s security.
Is the exact cause of the forged ONE tokens known?
Specific technical details about how the tokens were forged have not been fully disclosed, and further information from Harmony is expected to clarify the exploit’s mechanism.
Original source: AltcoinGordon
Syndicated coverage. Originally reported by altcoingordon.com.
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