View source for OPC Token Flawed Sell Burn Mechanism Price Logic Exploited

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[[File:Binancesecurity.jpg|thumb|Binance Security Image]]The OPC smart contract on Binance Smart Chain contained a critical flaw in its sell function that caused the token’s price to rise instead of fall during sales. This backwards logic stemmed from burning OPC tokens directly from the liquidity pool each time tokens were sold, artificially inflating the price with every transaction. An attacker exploited this mechanism to drive up the price and extract inflated profits, ultimately resulting in a loss of approximately $107.5K, according to TenArmor. The stolen funds were later funneled through TornadoCash, with no public updates from the OPC project or signs of recovery or investigation at this time.<ref name="tenarmortweet-21000" /><ref name="attacktransaction-21001" /><ref name="pennysplayertweet-21002" /><ref name="tikkalaresearchtweet-21003" /><ref name="jamesjhon9403tweet-21004" /><ref name="megakecctweet-21005" /><ref name="blocksecphalcontweet-21006" /><ref name="blocksec-21007" /><ref name="affectedcontract-21008" /><ref name="affectedcontractcreation-21009" /><ref name="tokenview-21010" />

== About OPC ==
The OPC smart contract was first created on the Binance Smart Chain on March 30th, 2025.

== The Reality ==
Unfortunately, the logic in the OPC smart contract was backwards, causing the price to increase as more tokens were sold.

== What Happened ==
A flawed sell function in the OPC smart contract caused token price to rise during sales, enabling an attacker to exploit the logic and steal approximately $107.5K.
{| class="wikitable"
|+Key Event Timeline - OPC Token Flawed Sell Burn Mechanism Price Logic Exploited
!Date
!Event
!Description
|-
|March 30th, 2025 10:58:55 PM MDT
|OPC Smart Contract Launch
|The OPC smart contract is first created on the Binance Smart Chain.
|-
|April 1st, 2025 5:05:45 AM MDT
|Attack Transaction
|The attack transaction is posted to the Binance Smart Chain.
|-
|April 1st, 2025 5:42:00 AM MDT
|TenArmor Tweet Alert
|TenArmor posts an alert about the incident online.
|-
|April 1st, 2025 5:43:00 AM MDT
|pennysplayer Tweet Posted
|Twitter/X user pennysplayer posts an analysis of the exploit, attributing it to the burning of tokens when selling.
|-
|April 1st, 2025 5:50:00 AM MDT
|0xEncore Analysis Posted
|Twitter/X user MegaKecc/0xEncore posts an analysis further.
|-
|April 1st, 2025 6:29:00 AM MDT
|BlockSec Phalcon Post
|BlockSec Phalcon posts a tweet with more details and high level analysis of the exploit.
|-
|April 1st, 2025 10:30:00 AM MDT
|Blockchain Security Post
|An account called BlockChain Security, with username jamesjhon, posts an update about the exploit.
|-
|April 1st, 2025 7:12:00 PM MDT
|Tikkala Research Tweet
|Tikkala Research shares their overall analysis of the exploit with high level details.
|}

== Technical Details ==
The exploit involving the OPC token, which resulted in a loss of approximately $104,000, was caused by a flawed implementation in the smart contract at address 0xa642. Specifically, the vulnerability lies in its custom sell function, identified by selector 0xdb3f7000. When tokens are sold through this function, it not only transfers tokens from the user but also burns a nearly equivalent amount of OPC tokens directly from the liquidity pool (e.g., a Uniswap pair). This unintended burning mechanism reduces the OPC supply in the pool, artificially inflating the token's price with each sale.

Because of this flawed logic, an attacker could repeatedly sell tokens and watch the price of OPC rise rather than fall — the opposite of expected market behavior. This created a feedback loop: the more tokens sold, the more tokens were burned from the pool, and the higher the price climbed. The attacker exploited this behavior to manipulate the price upward during sell operations, then likely swapped the inflated OPC tokens for other assets at a profit. The vulnerability stems from a misunderstanding of how liquidity pools work and the impact of modifying reserves directly, especially through token burning.

== Total Amount Lost ==
TenArmor reports "an approximately loss of $107.5K".

The total amount lost has been estimated at $108,000 USD.

== Immediate Reactions ==
There was widespread analysis among some third parties, however there doesn't appear to be any public presence with an official update from the OPC project.

== Ultimate Outcome ==
TenArmor reports that the stolen funds were subsequently deposited in TornadoCash.

== Total Amount Recovered ==
There is no indication that any of the funds have been recovered.

There do not appear to have been any funds recovered in this case.

== Ongoing Developments ==
It is unclear if any investigation is underway or any recovery in progress.
== Individual Prevention Policies ==
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== Platform Prevention Policies ==
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== Regulatory Prevention Policies ==
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== References ==
<references><ref name="tenarmortweet-21000">[https://twitter.com/TenArmorAlert/status/1907035768817594724 TenArmor - "Our system has detected a suspicious attack involving #OPC on #BSC, resulting in an approximately loss of $107.5K. The stolen funds have been deposited into http://Tornado.Cash." - Twitter/X] (Accessed Aug 12, 2025)</ref>

<ref name="attacktransaction-21001">[https://bscscan.com/tx/0x65a29faf44c5be567e9ea2aa419254263a1b8553799258d9e36769a06ceac109 Attack Transaction - BSCScan] (Accessed Aug 12, 2025)</ref>

<ref name="pennysplayertweet-21002">[https://twitter.com/pennysplayer/status/1907036000934855135 smhkptking - "OPC token exploited for $104k. Root cause: contract 0xa642 has a sell function 0xdb3f7000, when selling it burns almost the same amount of OPC tokens from pair and thus drives the price up. The more you sell, the higher price goes." - Twitter/X] (Accessed Aug 12, 2025)</ref>

<ref name="tikkalaresearchtweet-21003">[https://twitter.com/TikkalaResearch/status/1907239795157569826 <nowiki>Tikkala Research - "A 3-days OPC contract was attacked, with the attacker gaining about $107k in [one] transaction. The root cause is an unknown selector, 0xdb3f7000 in the contract, which burns tokens from swaps, affecting the K number." - Twitter/X</nowiki>] (Accessed Aug 12, 2025)</ref>

<ref name="jamesjhon9403tweet-21004">[https://twitter.com/jamesjhon9403/status/1907108432433307955 BlockChain Security - "root cause: 0xa642e66873111deb830739b90c03fd6981a34332 0xdb3f7000 function" - Twitter/X] (Accessed Aug 12, 2025)</ref>

<ref name="megakecctweet-21005">[https://twitter.com/MegaKecc/status/1907037811750101240 0xEncore - "OPC token exploited for $107.4k. Root cause: when sell tokens, sell function 0xdb3f7000  burns OPC tokens from pair and thus drives the price up. The more you sell, the higher price goes." - Twitter/X] (Accessed Aug 12, 2025)</ref>

<ref name="blocksecphalcontweet-21006">[https://twitter.com/Phalcon_xyz/status/1907047579554320686 BlockSec Phalcon - "ALERT! Our systems flagged a suspicious TX on #BSC exploiting price manipulation via burn pair, resulting in $107K loss." - Twitter/X] (Accessed Aug 12, 2025)</ref>

<ref name="blocksec-21007">[https://app.blocksec.com/explorer/tx/bsc/0x65a29faf44c5be567e9ea2aa419254263a1b8553799258d9e36769a06ceac109 OPC Incident Attack Transaction - BlockSec App] (Accessed Aug 12, 2025)</ref>

<ref name="affectedcontract-21008">[https://bscscan.com/address/0xa642e66873111deb830739b90c03fd6981a34332 Victim OPC Smart Contract - BSCScan] (Accessed Aug 12, 2025)</ref>

<ref name="affectedcontractcreation-21009">[https://bscscan.com/tx/0xa134092661c9ab193de21c7639c8a510e77a9d8feec8607a8cda78bc518aafcf Victim OPC Smart Contract Creation - BSCScan] (Accessed Aug 12, 2025)</ref>

<ref name="tokenview-21010">[https://bsc.tokenview.io/en/address/0x167d1798e044ef7434345697f7fdc59f0da7a59b Victim OPC Smart Contract - TokenView] (Accessed Aug 12, 2025)</ref></references>