Tropykus RSK Hack

TOTAL LOST $150K
Low Redeem Rounding Error Exploit rootstock

Summarize with AI

Affected Chain rootstock Incident surface
Recovered - No recovery reported
All-Time Rank #1393 By amount stolen
Auditors 2 Prior security audits

Incident Overview

Tropykus is a DeFi for Bitcoin lending and borrowing platform focused on Latanamerica.

Incident Report

Protocol / Project Tropykus RSK
Date of Incident
Affected Chain(s) rootstock
Attack Technique Redeem Rounding Error Exploit
Classification Protocol Logic
Primary Source View Post-Mortem

Protocol Information

Protocol Type Lending
Smart Contract Language Solidity
Official Website app.tropykus.com
Protocol Twitter/X @tropykus

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 redeem rounding error exploit and Solidity and EVM internals
Capital Required Seed capital to cover gas and initial position setup
On-Chain Access Ability to interact with rootstock smart contracts and deploy a custom exploit contract
Protocol Analysis Identification of the exploitable vulnerability in Tropykus RSK's contract logic - root cause: protocol logic
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 Redeem Rounding Error Exploit audit checklist and test coverage
Audited by Audit Report 1, Audit Report 2 — still lost $150K. Prior audits don't guarantee safety, especially after post-audit code changes.

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

  • Verify all logic paths related to Redeem Rounding Error Exploit are guarded by proper access controls and input validation - see the Arithmetic Overflows Underflows 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 Arithmetic Overflows Underflows examples →

Sources & References

Learn to Prevent the Next Tropykus RSK

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