Harmony Rolls Back Blockchain to Erase 4 Billion ONE Tokens

Rolling Back to August 11

The blockchain will revert to its state at 23:25 UTC on August 11, deleting all activity that occurred after that timestamp. Harmony confirmed the recovery plan in a post on X on August 17, 2026.

The first forged token mint happened just two blocks after the chosen checkpoint. The team selected an earlier buffer to ensure complete eradication of the unauthorized supply. Independent validators are now loading clean replacement databases for both network shards.

How the Exploit Happened

Roughly 4 billion ONE tokens appeared without authorization, pushing the token to a record low last week. The exploit swelled total supply by about 26% and significantly devalued the asset.

The Harmony team weighed less severe fixes before settling on a full rollback:

• Burning fake tokens wallet by wallet risked affecting legitimate holders caught in the same transactions
• A blacklist would have left the extra supply sitting on the chain, creating ongoing market uncertainty
• A full rollback applies the same rule uniformly to every transaction within the affected window

An outside security firm reviewed the incident and supported the team’s decision to move forward with the rollback.

The Cost of a Clean Slate

Wiping out the forged supply comes with an unavoidable tradeoff. The reset also deletes legitimate trades, swaps, and staking actions that occurred during the same window, creating a real headache for users and partners who acted in good faith.

Harmony says it is working with exchanges and bridges to soften the impact on those legitimate activities. Investigators managed to trace nearly all of the forged ONE tokens across various wallets, pools, and bridges.

Tracing tokens and recovering them are two different problems. Once forged tokens reached shared balances, like exchange wallets, burning them risked touching unrelated users’ funds in the process.

Where ONE Stands Right Now

On Tuesday, ONE traded near $0.00072, down 4% over 24 hours. Its market capitalization has shrunk to about $10.6 million, pushing it outside the top 1,000 cryptocurrencies by market value, according to BeInCrypto Markets.

Few networks take a step this drastic. Sui, for comparison, simply resumed block production after a stall earlier this year in May. Harmony chose instead to discard nearly a week of its own history.

Waiting on Exchanges to Reopen

The incident adds to a growing list of chain infrastructure attacks this year, following a Taiko bridge exploit back in June. Stolen funds tend to move faster than defenders can respond, and Harmony’s exploit was no exception.

Harmony has not yet announced a restart time for its network. The coming days will show whether exchanges reopen ONE deposits, and whether holders keep faith in a chain that just rewrote its own recent past.

Hashlytics Take

A rollback fixes the supply problem but creates a trust problem that lingers far longer. Every legitimate trade erased in this window is a user who did nothing wrong and still lost their transaction history. Harmony made the technically correct call here, but “technically correct” and “the market forgives you” are two very different outcomes for a token already sitting outside the top 1,000 by market cap.