Harmony Protocol
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Summary
On August 12, 2026, Harmony Protocol confirmed that an attacker exploited a quorum verification bug in its consensus layer to forge approximately 4 billion ONE tokens — roughly 26% of the circulating supply — with on-chain analysts later estimating the total forged supply across multiple wallet operations at approximately 2.385 trillion ONE. Approximately 97% of the initially identified minted tokens reached exchange deposit addresses before the exploit was publicly disclosed. Harmony deployed an emergency patch the same day, paused its bridge, and subsequently announced a full blockchain rollback to pre-exploit checkpoints on August 17, 2026, which was confirmed executed on August 18, 2026.
Connected Entities
1 entitiesTimeline(10 events)
2022-06-23
Harmony's Horizon Ethereum Bridge hacked for approximately $99.6 million; later attributed by Elliptic and the FBI to North Korea's Lazarus Group (APT38).
Harmony Medium / Elliptic2026-08-11
Exploit occurs. First forged mint recorded at Shard 0, block 92,730,036 at approximately 23:25:37 UTC. Attacker begins moving forged ONE to exchanges.
Crypto.news / CryptoSlate2026-08-12
On-chain researcher Juiceberg publicly identifies unauthorized minting of approximately 4 billion ONE tokens (approximately 26% of supply). Harmony confirms the exploit the same day.
The Block / CoinDesk / Coin3602026-08-12
ONE token price falls approximately 30–40%, reaching an all-time low of approximately $0.00057. Multiple exchanges begin receiving exploit-linked deposit requests.
CoinDesk / Cryptopolitan2026-08-12
Harmony deploys emergency validator release v2026.1.1 at approximately 06:30 UTC, patching both the quorum verification flaw and the cross-shard replay vulnerability. Bridge operations at bridge.harmony.one are paused approximately five hours after the initial alert.
Coin360 / KuCoin2026-08-12
Harmony publishes four attacker-linked wallet addresses and requests exchanges freeze associated funds. 53% of validators reported as having completed the emergency upgrade within four hours.
Coin3602026-08-13
Harmony posts an incident update via its official X (Twitter) account, providing further details and confirming ongoing coordination with exchanges, bridges, and law enforcement.
Harmony Protocol on X (official)2026-08-17
Harmony announces a full blockchain rollback to pre-exploit checkpoints — Shard 0 block 92,730,034 and Shard 1 block 94,978,278 — as the chosen remediation, rejecting token burning, blacklisting, selective replay, and token migration as alternatives.
Crypto.news / Crypto Economy / PrimeXBT2026-08-18
Harmony confirms execution of the blockchain rollback, reverting the chain to August 11 checkpoints and discarding over 109,000 regular transactions and 315 staking transactions.
CoinUnited / Harmony Protocol2026-08-20
Validators activate the second stage of the rollback procedure to restore network health.
CoinMarketCap AI / Search aggregationDecision Log
- #3review revise-10⛓ pending8/27/2026, 3:29:43 AMhash: FdcTaXkqka93sB9TBFv5frKcAKrmaKVUxtd1ACpN3aKH
- #2review⛓ pending8/27/2026, 3:29:43 AMhash: HTWCsQ7BZECjr9ZxEWLcwxCDQz5VkFpXK3dm4WADaSqw
- #1publish⛓ pending8/26/2026, 11:05:22 PMhash: EVpTudTc7u1VMBz6tNTXp3D91GYkccok31Re4vru7JKa
21 of 23 cited source URLs have an Internet Archive snapshot.
model: claude-sonnet-4-6
generated: 8/26/2026, 11:05:08 PM
last updated: 8/27/2026, 3:29:43 AM
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