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Banana Gun: a technical analysis of the Smart Contract bug and its impact in the crypto world

The crypto world is no stranger to both innovation and adversity, in a market driven by decentralized technologies and ambitious projects, the latest project to face the harsh reality of contract vulnerabilities is Banana Gun. 

Smart contract failures can be the fastest route to financial turmoil, the latest project to face the harsh reality of contract vulnerabilities is Banana Gun. 

This article delves into the technical complexities of the smart contract bug that led to the collapse of the BANANA token within hours of its launch.

The Banana Gun crypto project 

Banana Gun began as a trading bot on Telegram, capitalizing on the success of Unibot. The goal was to provide users with an innovative trading experience in the rapidly evolving cryptocurrency landscape. 

However, as history has shown, even in a bear market, eager participants, known as “degens,” eagerly seek opportunities to rapidly accumulate wealth.

On 12 September 2023, Bitcoiner Kyle Chassé brought attention to a newly created trading pair on Uniswap, BANANA/wETH

Within hours, the fully diluted value of this trading pair rose to an incredible $68 million. 

The new BANANA token soared to an impressive $8.70 before suffering a catastrophic collapse to $0.02, all within about three hours.

Predictably, accusations of a “rug pull,” a deceptive maneuver by the project’s creators to siphon off funds, began flooding the crypto community’s social media channels. 

However, the Banana Gun project team responded with an unexpected revelation. It admitted the existence of a critical smart contract bug that made an immediate fix impossible.

The technical aspect of the bug that affected the Banana Gun crypto

The team’s statement shed light on the nature of the bug: 

“Despite two audits, there is a bug in the contract with our taxes, which allows people to sell their bags while still having tax tokens in their wallets.”

This disclosure raised questions about the effectiveness of the auditing process in identifying such vulnerabilities.

In response to the crisis, the Banana Gun team outlined a two-step mitigation strategy. First, it decided to sell the treasury portfolios to deplete blocked cash, with the intention of reusing it for a new contract. 

Second, they pledged to relaunch the project as soon as possible, accompanying it with an airdrop to compensate affected participants.

The team emphasized their commitment to ensuring that the new contract undergoes rigorous vetting to prevent a recurrence of the bug.

 They stated: 

“We are having our new contract checked, but we will not launch it until we are sure everything is in order.”

This commitment reflects the growing awareness within the cryptographic community of the critical importance of security in smart contract development.

The Banana Gun saga took an unexpected turn when a pseudonymous coder claimed to have used OpenAI’s ChatGPT to discover the contract flaw. 

The coder observed: 

“Banana claimed to have two verifications. So I asked my favorite auditor, ChatGPT, for a third. And he found the bug.” 

This revelation highlights the wide range of tools available to identify vulnerabilities in smart contracts, even when traditional auditing processes are not up to the task.

Despite efforts to fix the smart contracts bug and correct the situation, the damage had already been done. Scott Melker, known as “The Wolf of All Roads,” commented on the situation, describing it as a “soap opera” of financial ups and downs.

Exploring the complexity of smart contracts

Smart contracts, in their essence, are self-executing pieces of code that automatically facilitate, verify or enforce the terms of an agreement without the need for intermediaries. 

In the world of cryptocurrencies and decentralized applications (dApps), they play a key role in automating various processes, from simple transactions to complex financial instruments. However, this new efficiency comes with its own set of challenges.

Smart contracts are typically written in programming languages such as Solidity, designed specifically for Ethereum, or in languages compatible with other blockchain platforms. 

These contracts rely on the immutable nature of the blockchain, making it nearly impossible to change them once implemented. As a result, careful and meticulous code development becomes critical.

In the case of Banana Gun, the revelation of a critical bug despite undergoing two separate audits raises questions about the effectiveness of audit processes. 

Audits are a crucial line of defense against vulnerabilities, but they are not foolproof. Smart contract auditors must navigate a complex terrain of code to identify potential weaknesses, often under tight deadlines.

ChatGPT’s involvement in the discovery of the Banana Gun bug highlights the evolving landscape of auditing tools. 

While traditional audits rely on human experience, AI-based tools can provide an additional layer of scrutiny. 

However, their effectiveness remains an open question, as their ability to detect nuanced vulnerabilities may vary.


As the cryptocurrency space continues to evolve, so will the technologies and methodologies used in its development. 

Security of smart contracts will remain a pressing concern, leading to innovation in verification processes, code development and vulnerability detection.

In conclusion, the failure of the Banana Gun project provides a valuable lesson for cryptocurrency enthusiasts and project developers alike. The world of cryptocurrency is full of potential, but it is equally full of risk.

Smart contracts, while powerful tools, require meticulous attention to detail, a commitment to security, and a willingness to adapt and improve in response to unforeseen challenges. 

Only by addressing these fundamental issues can the cryptographic community and its projects hope to build a more resilient and reliable future.

In this rapidly evolving landscape, it is not just about who can create the most innovative projects, but also who can safeguard against the ever-present threat of smart contract vulnerabilities.