Multichain Hack

TOTAL LOST $126M
Critical #68 All-Time Private Key Compromised (Unknown Method) bsc fantom moonriver

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain bsc 3 chains affected
Recovered - No recovery reported
All-Time Rank #68 By amount stolen
Auditors 4 Prior security audits

Incident Overview

Cross-Chain Router Protocol (CRP), envisioned to be the ultimate router for Web3.

This is classified as a Access Control Attacks . Compare similar hacks →

Incident Report

Protocol / Project Multichain
Date of Incident
Affected Chain(s) bsc fantom moonriver
Attack Technique Private Key Compromised (Unknown Method)
Classification Infrastructure
Primary Source View Post-Mortem

Protocol Information

Protocol Type Bridge
Official Website multichain.org/
Protocol Twitter/X @MultichainOrg

Market Context at Time of Hack

Token Categories
Ethereum Ecosystem Three Arrows Capital Portfolio Polygon Ecosystem Fantom Ecosystem Arbitrum Ecosystem Moonriver Ecosystem BNB Chain Ecosystem Circle Ventures Portfolio
Protocol Links
GitHub Telegram

What the Attacker Needed to Succeed

Understanding the prerequisites for this type of attack helps auditors identify protocols that are most at risk and helps developers build better defenses.

Technical Knowledge Operational-security tradecraft (phishing, malware, leaked seed phrases, or insider access) to obtain treasury signing authority
Capital Required Minimal capital - only enough to cover gas while draining the compromised accounts
On-Chain Access Valid signing authority over the compromised wallets / multisig signers, allowing direct transfer of funds or stake authorization
Target Reconnaissance Identification of Multichain's high-value treasury accounts and the authority / multisig structure controlling them
Execution Speed Speed to drain the compromised accounts before the team detects the breach and revokes signing authority or freezes the assets
Obfuscation Plan A strategy to launder and move stolen funds - typically through mixers, cross-chain bridges, or decentralized DEX swaps to resist tracing

What Auditors Should Check

Could this have been caught in audit? Hard to catch — private key / OpSec failures are outside smart contract audit scope
Audited by Audit Report 1, Audit Report 2, Audit Report 3, Audit Report 4 — still lost $126M. Prior audits don't guarantee safety, especially after post-audit code changes.

If you're auditing a protocol with similar architecture to Multichain, these are the critical security checks that could have prevented this incident (July 2023).

  • Verify all logic paths related to Private Key Compromised (Unknown Method) are guarded by proper access controls and input validation - see the Access Control Attacks attack class for patterns
  • Review privileged functions (owner, admin, governance) for potential abuse vectors - centralization risks should be documented and bounded with timelocks or multi-sigs

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Security Audit History

Related Attack Classes

The technique used in this hack maps to these vulnerability classes in our security curriculum:

See all Access Control Attacks examples →

Access Control Attacks

Sources & References

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These hacks used the same attack technique. Understanding the pattern helps prevent future exploits.

Zoth ZeUSD $8.8M
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Moby $1.5M
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CoinStats $2.2M
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Locus Finance $321K
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OKX DEX $2.7M
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Huobi $26.4M
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