Hinkal Hack

TOTAL LOST $820K
Low Other

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain 2026 Incident surface
Recovered - No recovery reported
All-Time Rank #865 By amount stolen
Protocol Type Exploit/Other Target category

Incident Overview

Quick Summary

In 2nd July 2026, the privacy-focused DeFi protocol Hinkal suffered a smart contract exploit on Ethereum mainnet, resulting in a loss of approximately $820,000 in USDC.

Details of the Exploit

The exploit targeted Hinkal's core privacy transaction logic on Ethereum. The root cause was a cryptographic validation flaw known as a "proofless deposit" vulnerability within the contract's execution pathways. The attacker leveraged an externally owned account (EOA) to make a series of unauthorized transact() function calls.

Due to insufficient validation of zero-knowledge proof components during these specific deposit routines, the contract mistakenly accepted the execution payload without requiring or verifying a valid cryptographic validity proof. This logical gate failure allowed the attacker to forge state parameters and drain roughly 797,000 USDC directly from the affected Ethereum liquidity pool. The stolen assets were quickly converted into 454 ETH, with 410 ETH routed to Tornado Cash and the remaining 44.67 ETH cross-chain swapped into Bitcoin via THORChain.

Hinkal contained the attack by pausing all contracts across its deployment chains and pledged a 1:1 treasury-backed user reimbursement plan.

Block Data Reference

Exploiter Address: 0xbB3f01a1…32fc20

Incident Report

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

Protocol Information

Protocol Type Exploit/Other
Official Website www.hinkal.io/
Protocol Twitter/X @hinkal_protocol
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 Hinkal's contract logic - root cause: other
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 Hinkal, these are the critical security checks that could have prevented this incident (July 2026).

  • 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

Master these auditing techniques with hands-on labs and real exploit scenarios in the Smart Contract Hacking course.

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