Harmony Weighs Rollback After Claims of 4B ONE Exploit

Harmony Weighs Rollback After Claims of 4B ONE Exploit

Harmony is weighing a blockchain rollback and working with exchanges to freeze funds after claims an attacker exploited the network to mint nearly 4 billion ONE tokens.

Harmony probes reported 4B ONE mint as price plunges

Harmony is working with exchanges and weighing a rollback after an analyst reported an unauthorized 4 billion ONE mint that sent ONE lower.

Harmony’s ONE falls 26% after attacker allegedly mints 4 billion tokens

Harmony said in Asian morning hours it is working with exchanges to freeze funds and preparing a software fix.

Harmony Protocol Suffers Major Exploit Involving Four Billion Tokens

Reading Time: 2 minutesKey Takeaways: Harmony Protocol confirmed a big security incident on August 12, 2026, after researchers discovered four billion illegally minted ONE tokens. The attacker exploited block production rules using empty blocks to mint tokens without triggering supply tracking dashboards. Harmony released validator patches, paused its Horizon Bridge, and evaluated blockchain rollback options to contain the damage. User Score9 F…

Harmony Patches Pre-Staking Quorum and Receipt-Replay Flaws After ONE Mint Claim

Harmony released a mainnet patch on Aug. 12 that changes two verification paths after reports of an unauthorized ONE mint: a quorum check affecting pre-staking-epoch committees and a cross-shard receipt mechanism that could apply the same transfer more than once. The v2026.1.1 release came after... Read the full story at The Defiant

What Happens to ONE Holders After Harmony's 4B Token Exploit?

Harmony got hit by an unauthorized mint of 4 billion ONE, totaling 26% of supply. An analyst estimates that about 2.8 billion ONE had already made their way to exchanges. The blockchain is looking into a rollback after sending out an emergency patch. Harmony is dealing with an apparent unauthorized mint of approximately 4 billion ONE. That’s roughly 26% of the token’s total circulating supply, which stands at around 15 billion. According to anal…