Harmony is studying a rollback of its blockchain after claims that an attacker exploited the network to skim nearly 4 billion ONE tokens, which is equivalent to about 26% of the token’s circulating supply.
Harmony said on Tuesday that it is working with exchanges to halt and freeze the funds, and also stated that it is preparing a technical correction and assessing rollback options for the ledger. At the same time, the network did not confirm the cause of the incident, the number of coins created, or the amount that reached trading platforms.
Harmony’s response came after a post from an account on the X platform named Juiceberg, claiming that unapproved ONE coins had been minted through empty blocks, and that about 2.8 billion coins were quickly transferred to exchanges as the price of ONE fell. The account also estimated that the attacker held roughly 115 million ONE on-chain, equivalent to 2.9% of the amount allegedly minted, while the rest was sold or held in exchange deposit wallets. These claims could not be independently verified.
According to CoinGecko data, the price of ONE fell by 33.9% over the last 24 hours at the time of writing, reflecting the market’s sensitivity to any security disruption or supply anomaly.
These developments follow the Horizon Bridge incident in June 2022, when Harmony suffered a hack that led to the theft of about $100 million in crypto assets, before the Federal Bureau of Investigation later attributed the attack to the Lazarus Group linked to North Korea.
For ONE holders and traders, attention is now focused on three tracks: how successful Harmony is at freezing funds, whether exchanges will respond to stop requests, and then whether a patch or rollback will be used to address the potential impact on the network and supply.