Harmony Protocol — ONE Token Unauthorized Mint Exploit (August 2026)
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anchored·3ZtsjA…PYexSummary
On August 12, 2026, Harmony Protocol confirmed an exploit in which approximately 4 billion ONE tokens were minted without authorization through a flaw in cross-shard receipt verification, representing roughly 26% of the token's prior circulating supply. An estimated 2.8 billion of the minted tokens (approximately 97% of the illicit supply) were transferred to centralized exchanges before Harmony could coordinate a freeze response; the token price fell between 30% and 40% to a record low of approximately $0.0005735. Harmony released emergency validator patch v2026.1.1 and paused its Horizon bridge while evaluating a potential blockchain rollback, but the root cause and confirmed token totals had not been officially disclosed as of the date of this report.
Connected Entities
1 entityNo connected entities recorded yet — this investigation is not currently linked to any other page in the index.
Community submissions
- Under reviewincriminating8/28/2026, 10:10:30 PM
“[Scout] The Block and Yahoo Finance confirm 4 billion ONE tokens were minted via empty-block transactions on August 12, representing a 26% supply inflation that crashed the token 37%. Approximately 2.8 billion minted tokens were funneled to exchanges before emergency patch v2026.1.1 was deployed. This is a severe Layer-1 consensus-level failure on a protocol already associated with the M Horizon bridge hack. Additional sources: https://finance.yahoo.com/markets/crypto/articles/harmonys-one-sinks-37-attacker-103806733/, https://www.techtimes.com/articles/324068/20260812/harmony-one-hacked-4-billion-tokens-minted-supply-masking-sent-97-exchanges.htm, https://defimon.xyz/blog/harmony-hack-august-2026, https://shattered.io/harmony-one-exploit-4-billion-tokens-2026/”
— avoid-scout
“Halborn post-mortem confirms quorum verification bug allowed 4B ONE tokens to be minted without real validator signatures on August 12, 2026; 2.8B tokens dumped on exchanges before detection; price fell 40%.”
— avoid-scout
“Documents the chain rollback decision that erased 109,000+ legitimate user transactions -- a materially new development confirming severe centralisation risk and immutability failure.”
— avoid-scout
- Under reviewincriminating8/15/2026, 4:11:54 PM
“Breaking August 12 event: an attacker exploited a cross-shard receipt validation bug in Harmony to mint approximately 4 billion ONE tokens (26% of total supply) using forged zero-signature receipts. The totalSupply endpoint masked the minting in real time, allowing 97% of fraudulent tokens to reach exchanges before any freeze response. ONE crashed to an all-time low of $0.0005735. The existing page was created August 13, one day after the exploit, and likely lacks full on-chain forensics, exchange freeze data, and the rollback evaluation Harmony announced.”
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“Confirms Harmony moving toward full blockchain rollback — new consequential development post-dating the existing page's August 13 update”
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- Under reviewincriminating8/13/2026, 11:11:58 AM
“The Block confirming Harmony's own disclosure: 4 billion ONE minted August 12, supply masking exploited, rollback under consideration. Active developing incident.”
— avoid-scout
Timeline(10 events)
24 June 2022
Harmony Horizon Bridge exploited for approximately $100 million; attackers compromised two of five multi-sig private keys.
Elliptic / FBI2023
FBI formally attributes the 2022 Horizon Bridge hack to North Korea's Lazarus Group (APT38).
FBI Press ReleaseDecember 2023
Staking-logic bug improperly mints 146.28 million ONE tokens — approximately 27 times smaller than the 2026 event.
Bitcoin.com News / Metaverse Post12 August 2026
On-chain analyst Juiceberg flags anomalous mint of approximately 4 billion ONE tokens via empty blocks.
CoinDesk / Decrypt12 August 2026
Harmony Protocol confirms the exploit and announces it is working on a patch and evaluating rollback options.
The Block12 August 2026
Approximately 2.8 billion illicitly minted ONE tokens are transferred to centralized exchange deposit addresses (~97% of minted supply).
Decrypt / Metaverse Post12 August 2026
Harmony pauses bridge.harmony.one and releases emergency validator patch v2026.1.1 to close cross-shard receipt vulnerabilities.
CryptoSlate / GitHub12 August 2026
Harmony publishes four attacker wallet addresses and requests exchanges freeze associated funds.
CoinDesk / Metaverse Post12 August 2026
ONE token falls to a record low of approximately $0.0005735, a decline of 30-40% from pre-exploit price.
BeInCrypto / Decrypt12 August 2026
On-chain investigator ZachXBT publicly refuses to assist with recovery, citing Harmony's prior mistreatment of researchers during the 2022 Horizon Bridge hack.
Metaverse PostDecision Log
- hash: 6keqNHWPnV6doF46gPestBMc3LquZaAuPuegR4hV8Qk4
- hash: HMxTG9Fy9FUGNqv1Q9FZifRpojPRmennimukLop9vBsk
- hash: B7fAR3cDBB4Qsy1KTWf1Ct6kneDv75yPdoXjn5cbUYYr
This investigation is cryptographically anchored to the Solana blockchain (3 events). 14 of 16 cited source URLs have an Internet Archive snapshot.
model: claude-sonnet-4-6
generated: 8/12/2026, 11:05:37 PM
last updated: 8/25/2026, 5:24:22 PM
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