Ronin Bridge validator-key compromise
In March 2022, Ronin Bridge was exploited after validator keys were compromised, leading to one of the largest reported bridge losses in crypto history. The incident later became a reference case for bridge validator and cross-chain security risk.
Incident facts
- Incident title
- Ronin Bridge validator-key compromise
- Bridge
- Ronin Bridge
- Incident date
- 2022-03-29
- Incident type
- Exploit
- Major incident
- Yes
- Affected chains
- Ronin, Ethereum
- Affected assets
- ETH, USDC
- Attack category
- Validator Key Compromise
- Reported loss
- $620 million
- Recovery
- Partial Recovery
- Reimbursement
- Completed
- Restart
- Reopened
- Current outcome
- Active After Incident
- Resolution
- Final outcome known
- Last reviewed
- 2026-06-11
- Last verified
- 2026-06-11
Timeline events
Ronin Bridge exploit disclosed2022-03-29
The Ronin Bridge incident became public after a large unauthorized withdrawal involving ETH and USDC was identified.
Attribution to Lazarus-linked activity reported2022-04-14
Public reporting and government context associated the Ronin incident with North Korea-linked Lazarus activity.
Recovery and reimbursement aftermath tracked2022-06
The incident led to recovery, reimbursement, and reopening-related aftermath that remains central to Ronin Bridge's historical record.
Evidence records
- Blockchains Have a 'Bridge' Problem, and Hackers Know ItWired · Tier 2 · 2022-04-03
- $620 million crypto theft linked to North KoreaAxios · Tier 2 · 2022-04-14
- Treasury sanctions Lazarus-linked crypto activity contextU.S. Department of the Treasury · Tier 1 · 2022-04-14
- SoK: A Review of Cross-Chain Bridge Hacks in 2023arXiv · Tier 2 · 2025-01-06
Known unknowns
- Exact loss valuation varies by source and valuation date.
- This seed record does not yet include a full reimbursement timeline.