Harmony Network Suffers Major Hack: 4 Billion ONE Tokens Unauthorized Minted, Price Drops 40%
Key Takeaways
- •A security vulnerability in the Harmony Protocol allowed approximately 4 billion ONE tokens to be unauthorized minted, equal to about 26% of the total ONE supply.
- •Harmony's investigation found the illegitimate tokens were spread across 409 wallets through 10,288 anomalous transactions.
- •The Harmony team contacted centralized exchanges and requested they block funds directed to four identified groups of wallet addresses.
- •Approximately 53% of Harmony network validators have applied a software patch designed to prevent any further unauthorized token creation.
- •Following disclosure of the breach, the ONE token's price dropped roughly 40% to approximately $0.000747 according to CoinMarketCap data.
Harmony Network Suffers Major Hack: 4 Billion ONE Tokens Unauthorized Minted, Price Drops 40%
A significant security incident struck the cryptocurrency market today, targeting the Harmony network. Harmony, a Layer 1 blockchain launched in 2019 that utilizes an Effective Proof-of-Stake consensus mechanism, experienced a major attack — its most severe in recent years. The network had previously attracted attention for its cross-chain bridge infrastructure.
The breach stemmed from a suspected security vulnerability in the Harmony Protocol that enabled the unauthorized minting of approximately 4 billion ONE tokens. According to Harmony, this amount represents roughly 26% of the network's total ONE supply. Unauthorized minting attacks are particularly damaging to blockchain projects because they directly inflate a token's circulating supply, diluting existing holders — a distinct mechanism from exploits that only steal pre-existing tokens.
Investigation Reveals Scope of the Attack
Harmony's post-incident investigation identified approximately 4 billion unauthorized ONE tokens distributed across 409 different wallets, involving a total of 10,288 anomalous transactions.
Centralized Exchanges Notified
Following the discovery, the Harmony team announced that it had contacted centralized cryptocurrency exchanges to coordinate efforts to prevent suspicious fund movements. The project identified four groups of wallet addresses and formally requested that exchanges block any funds directed to those addresses. This approach mirrors tactics used by other blockchain projects after large-scale exploits, where centralized exchanges serve as key checkpoints for intercepting illicitly obtained tokens before they can be converted to other assets.
Validators Apply Patch
According to the project's description, approximately 53% of validators on the Harmony network have already applied a software patch designed to prevent further unauthorized token issuance. In Proof-of-Stake networks like Harmony, protocol-level fixes require coordination among decentralized validators, making rapid response more complex than on networks with centralized control. The 53% figure suggests the patch had not yet achieved the validator participation level typically needed for consensus-level enforcement at the time of reporting.
ONE Token Price Plummets
The revelation of the security vulnerability triggered a sharp decline in the price of ONE. According to CoinMarketCap data, the ONE token lost approximately 40% of its value following the news, falling to around $0.000747.
This article is for informational purposes only and does not constitute investment advice.
