Harmony, a Layer-1 blockchain that was launched in 2019, announced on X today, August 12, 2026 that it faced a major security breach. According to the post, someone managed to mint about 4 billion ONE tokens without permission and this number is roughly 26% of the entire token supply. The blockchain is now working with exchanges to freeze and block any funds that are linked to the exploit. The team is also working on a patch and is considering rolling back the chain to fix the problem.
The exploit is already putting a lot of heavy pressure on ONE’s market price. On chain analyst Juiceberg said about 2.8 billion of the newly minted ONE was quickly sent to exchanges, which caused the token’s value to drop. Based on Juiceberg’s numbers, only around 115 million ONE from the new batch is still on chain; the rest is either sold or sitting in exchange wallets, possibly waiting to be sold.
The attacker has roughly 115M ONE left to sell onchain — about 2.9% of the ~4B they minted. The
overwhelming majority (~97%) is already on exchanges and has either been sold or is sitting in deposit wallets ready to sell— Juiceberg (@the_juice_berg) AUGUST 12, 2026
Unauthorized Mint Puts Billions of ONE into Circulation
The main problem here is that the new ONE tokens were created without authorization, because of empty block minting. Juiceberg’s report says the total minted was around 4 billion ONE, which is a huge figure, making about a quarter of the entire supply. The attacker unleashed this new supply on the market fast enough and roughly 2.8 billion ONE went straight to exchanges right after the exploit.
Now, according to Juiceberg, the attacker has about 115 million ONE left to move on chain, which is less than 3% of what was minted. Most of the tokens, 97%, in fact, are already sitting in exchanges, either sold or waiting to be sold out. All this extra supply has added pressure to the ONE market.
Soon after the incident was confirmed, ONE’s price crashed by 30%. Still, it is not clear if all 2.8 billion ONE sent to exchanges has actually been sold yet. Some tokens may just be sitting in deposit wallets, not liquidated, at least not yet. At the time of writing, the price of the ONE token is trading at $0.0007827 with a drop of 36.4% in the last 24-hours as per CoinGecko.
Harmony has asked exchanges to freeze any funds connected to four specific wallet addresses. These include both ONE and corresponding Ethereum like addresses.
The four ONE wallet addresses named by Harmony are:
- one1uap8dx2z0qsjxqthm5flgcxkeepsz3gsrghnfn
- one17u300a40ll5wphd8kj5hktryhdjq3ml9f4phy4
- one1a5hur07z5vtvzhr35zkw8tfqedemkz8t88xgd7
- one1h56hkxmua0uzfv07fu04cudvtrl35u96pq47vy
The corresponding addresses provided by Harmony are:
- 0xe7427699427821230177dd13f460d6ce43014510
- 0xf722f7f6afffe8e0dda7b4a97b2c64bb6408efe5
- 0xed2fc1bfc2a316c15c71a0ace3ad20cb73bb08eb
- 0xbd357b1b7cebf824b1fe4f1f5c71ac58ff1a70ba
The network wants these funds to be frozen so that tokens do not move any further. The network has also rolled out a patch for a quick fix and the blockchain is still figuring out if a chain rollback is possible. They have not said what exactly caused the exploit, or confirmed the exact sum involved. So there are still questions that remain unanswered, such as: How did the attacker even carry out the unauthorized mint? How much damage is really done? Also, this is not Harmony’s first security issue either. Back in 2022, the Horizon Bridge exploit cost the network nearly $100 million.
Recent Update
According to a post by Harmony on X, the team has tracked 10,288 transfers across 409 wallets which hold the fraudulently created tokens. Harmony, as stated above, has warned exchanges about hundreds of suspicious deposits, leading them to block the hacker’s wallet. Moreover, 53% of validators have already installed the emergency patch released four hours ago. The team is still working on a solution, with a rollback currently seen as the most practical option as of now.
