Quixotic Hack

TOTAL LOST $200K
Low Other

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain 2022 Incident surface
Recovered - No recovery reported
All-Time Rank #1294 By amount stolen
Protocol Type Exploit/Other Target category

Incident Overview

Quick Summary

Quixotic, the largest NFT marketplace on Optimism, experienced an exploit on July 1 that resulted in the loss of ERC-20 tokens. The hacker was able to transfer offers made on NFTs to their own wallet, resulting in a loss of at least $100,000.

Details of the Exploit

The Quixotic NFT marketplace was exploited due to a vulnerability in its offer feature. The hacker was able to transfer offers made on NFTs to their own wallet by deploying their smart contract to overrun the existing logic of the offer function. The team at NFT project Apetimism first noted the exploit and recommended canceling all open offers to protect users.

The Quixotic team paused all marketplace activity to investigate the incident and assured users that lost funds would be returned. The hacker was able to steal at least $200,000 in ERC-20 tokens, with several large outflows noted from their wallet, including 110,756 USDC and 170,882 Optimism (OP), valued at $90,500.

Block Data Reference

Transaction details on etherscan: https://etherscan.io/tx/0x2a822968…17647f

Incident Report

Protocol / Project Quixotic
Date of Incident
Attack Technique Other
Classification NFT
Primary Source View Post-Mortem #1 View Post-Mortem #2

Protocol Information

Protocol Type Exploit/Other
Official Website qx.app/
Protocol Twitter/X @qx_app
Team Anonymous
Source Code Unverified

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 Deep understanding of other and Solidity and EVM internals
Capital Required Seed capital to cover gas and initial position setup
On-Chain Access Ability to interact with smart contracts and deploy a custom exploit contract
Protocol Analysis Identification of the exploitable vulnerability in Quixotic's contract logic - root cause: nft
Execution Speed Precise transaction ordering and timing to exploit the vulnerability within a single atomic block
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? Likely — with a thorough Other audit checklist and test coverage

If you're auditing a protocol with similar architecture to Quixotic, these are the critical security checks that could have prevented this incident (July 2022).

  • Verify all logic paths related to Other are guarded by proper access controls and input validation
  • 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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Sources & References

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