How much was lost in the Bitcoin Mission hack?

The Bitcoin Mission hack resulted in $1.3M in losses on April 22, 2025.

What attack technique was used in the Bitcoin Mission exploit?

The Bitcoin Mission exploit utilized overPaper Function Exploit. Understanding this attack vector is critical for smart contract auditors and developers building secure DeFi protocols.

How can developers prevent similar smart contract attacks?

Preventing smart contract hacks requires a combination of secure coding practices, thorough security audits, and understanding common attack vectors like reentrancy, oracle manipulation, and access control flaws. Smart Contract Hacking (SCH) provides hands-on training to help developers and auditors identify and prevent vulnerabilities before deployment.

Bitcoin Mission Hack

TOTAL LOST $1.3M

Medium Apr 22, 2025 overPaper Function Exploit arbitrum

Affected Chain arbitrum Incident surface

Recovered - No recovery reported

All-Time Rank #771 By amount stolen

Year 2025 Incident year

Incident Overview

BitCoin One (BTCONE) is a cryptocurrency . BitCoin One has a current supply of 13,757,704.8560313 with 13,757,694.8560313 in circulation. The last known price of BitCoin One is 0.00006277 USD and is up 0.54 over the last 24 hours.

More information can be found at https://www.bitcoinone.io.

Incident Report

Protocol / Project Bitcoin Mission

Date of Incident April 22, 2025

Affected Chain(s) arbitrum

Attack Technique overPaper Function Exploit

Classification Protocol Logic

Primary Source View Post-Mortem

Protocol Information

Smart Contract Language Solidity

Official Website www.bitcoinone.io

Protocol Twitter/X @THEBITCOINONE

Market Context at Time of Hack

Protocol Links

GitHub

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 overpaper function exploit and Solidity and EVM internals

Capital Required Seed capital to cover gas and initial position setup

On-Chain Access Ability to interact with arbitrum smart contracts and deploy a custom exploit contract

Protocol Analysis Identification of the exploitable vulnerability in Bitcoin Mission'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 overPaper Function Exploit audit checklist and test coverage

If you're auditing a protocol with similar architecture to Bitcoin Mission, these are the critical security checks that could have prevented this incident (April 2025).

Verify all logic paths related to overPaper Function Exploit 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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Sources & References

01
Source 1 https://x.com/officer_cia/status/1914690926695362685

Threat Assessment

Severity Level

MEDIUM

Attack Vector overPaper Function Exploit
Root Cause Protocol Logic
Year 2025

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