How much was lost in the Binary Protocol hack?

The Binary Protocol hack resulted in $4K in losses on January 29, 2021.

What attack technique was used in the Binary Protocol exploit?

The Binary Protocol exploit utilized Rugpull. 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.

Binary Protocol Hack

TOTAL LOST $4K

Low Jan 29, 2021 Rugpull ethereum

Affected Chain ethereum Incident surface

Recovered - No recovery reported

All-Time Rank #1990 By amount stolen

Auditors 1 Prior security audit

Incident Overview

The contract deployer used a hidden minting functionality under the function initialSupply(), which was invoked by the contract deployer 3 times:

https://etherscan.io/tx/0x7467abb5…93a521

https://etherscan.io/tx/0xf4b6c140…c2293c

https://etherscan.io/tx/0x672689de…3dc887

In the function input data, the recipient address of the minted tokens was this address:

0xD97A7501…34050C

This external wallet added initial liquidity at:

https://etherscan.io/tx/0x1cdad510…825da5

The transaction, where the external wallet sold tokens:

https://etherscan.io/tx/0x0c02a010…41b083

Incident Report

Protocol / Project Binary Protocol

Date of Incident January 29, 2021

Affected Chain(s) ethereum

Attack Technique Rugpull

Classification Exchange (DEX)

Primary Source View Post-Mortem

Protocol Information

Protocol Type Liquid Staking

Affected Token BP

Official Website linearprotocol.org

Protocol Twitter/X @LinearProtocol

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 rugpull and Solidity and EVM internals

Capital Required Seed capital to cover gas and initial position setup

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

Protocol Analysis Identification of the exploitable vulnerability in Binary Protocol's contract logic - root cause: exchange (dex)

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? Hard to catch — private key / OpSec failures are outside smart contract audit scope

Audited by Audit Report 1 — still lost $4K. Prior audits don't guarantee safety, especially after post-audit code changes.

If you're auditing a protocol with similar architecture to Binary Protocol, these are the critical security checks that could have prevented this incident (January 2021).

Verify all logic paths related to Rugpull 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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Security Audit History

Audit Report 1 Report

Sources & References

01
Source 1 https://twitter.com/CaptainJackAPE/status/1355054630770626560

Threat Assessment

Severity Level

LOW

Attack Vector Rugpull
Root Cause Exchange (DEX)
Year 2021

Learn to Prevent the Next Binary Protocol

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