Smart Contract Audit Report
Defi Tiger is a new BEP-20 token on the Binance Smart Chain that pays static rewards to holders.
For this audit, we reviewed the project team's CoinToken contract at 0xb1957bdba889686ebde631df970ece6a7571a1b6 on the Binance Smart Chain Mainnet.
Informational findings were identified and the team may want to review them.
Date: January 16th, 2023.
Finding #1 - CoinToken - InformationalDescription: The
_MAXstate variables cannot be modified but are not declared constant.
Recommendation: The above state variables could be declared constant for additional gas savings on each reference.
Finding #2 - CoinToken - InformationalDescription: The _getTaxFee() private function is never called in the contract.
Recommendation: The above function could be removed to reduce contract size and deployment costs.
Finding #3 - CoinToken - InformationalDescription: Although the SafeMath library is utilized, the contract is deployed with Solidity v0.8.2 which has built-in overflow/underflow checks.
Recommendation: SafeMath could be safely removed to reduce contract size, deployment costs, and gas costs on all transactions that utilize it.
- The total supply of the token is currently ~842.42 trillion $DTG [842,420,386,168,055].
- No public mint or burn functions are present, though the circulating supply can be decreased by sending tokens to the 0x..dead address.
- At the time of writing this report, there are 10,540 total token holders. The token allocation is as follows:
- 39.62% of the total supply has been sent to the 0x..dead address.
- The next five EOAs own a cumulative 9.79% of the total supply.
- 1.58% of the total supply is in Pancakeswap liquidity.
- Of that liquidity, 98.7% of the LP tokens are locked in a Unicrypt token locking contract and will unlock on July 4th, 2023.
- There is a 3% Tax fee, 3% Charity fee, and 3% Burn fee on all transfers where the recipient is not excluded from fees and the team's Fee wallet is neither the sender nor the recipient.
- The tokens collected through the Tax fee are removed from the circulating supply; This serves as a frictionless fee redistribution that automatically benefits all token holders at the time of each transaction.
- The tokens collected through the Charity fee are sent to the team's Fee wallet.
- The tokens collected through the Burn fee are removed from the total supply.
- As the contract is deployed with Solidity v0.8.2, it is safe from any possible overflows/underflows.
- The contract complies with the BEP-20 token standard.
- Ownership has been renounced by the team.
- The owner was previously able to update the Tax fee, Charity fee, and Burn fee to any percentages up to 99% at any time.
- The owner was previously able to exclude and include accounts from transfer fees and reward distribution.
- The owner was previously able to update the team's Fee wallet to any address at any time.
|Arbitrary Jump/Storage Write||N/A||PASS|
|Centralization of Control||Ownership has been renounced by the team.||PASS|
|Delegate Call to Untrusted Contract||N/A||PASS|
|Dependence on Predictable Variables||N/A||PASS|
|Improper Authorization Scheme||N/A||PASS|
|Outdated Compiler Version||N/A||PASS|
|Unused Code||The _getTaxFee() private function is never called in the contract.||PASS|
|Overall Contract Safety||PASS|
($) = payable function # = non-constant function Int = Internal Ext = External Pub = Public + Context - [Int] _msgSender - [Int] _msgData + [Int] IBEP20 - [Ext] totalSupply - [Ext] balanceOf - [Ext] transfer # - [Ext] allowance - [Ext] approve # - [Ext] transferFrom # + [Lib] SafeMath - [Int] add - [Int] sub - [Int] sub - [Int] mul - [Int] div - [Int] div - [Int] mod - [Int] mod + [Lib] Address - [Int] isContract - [Int] sendValue # - [Int] functionCall # - [Int] functionCall # - [Int] functionCallWithValue # - [Int] functionCallWithValue # - [Prv] _functionCallWithValue # + Ownable (Context) - [Pub] owner - [Pub] renounceOwnership # - modifiers: onlyOwner - [Pub] transferOwnership # - modifiers: onlyOwner + CoinToken (Context, IBEP20, Ownable) - [Pub]
($) - [Pub] name - [Pub] symbol - [Pub] decimals - [Pub] totalSupply - [Pub] balanceOf - [Pub] transfer # - [Pub] allowance - [Pub] approve # - [Pub] transferFrom # - [Pub] increaseAllowance # - [Pub] decreaseAllowance # - [Pub] isExcluded - [Pub] totalFees - [Pub] totalBurn - [Pub] totalCharity - [Pub] deliver # - [Pub] reflectionFromToken - [Pub] tokenFromReflection - [Ext] excludeAccount # - modifiers: onlyOwner - [Ext] includeAccount # - modifiers: onlyOwner - [Ext] setAsCharityAccount # - modifiers: onlyOwner - [Pub] updateFee # - modifiers: onlyOwner - [Prv] _approve # - [Prv] _transfer # - [Prv] _transferStandard # - [Prv] _standardTransferContent # - [Prv] _transferToExcluded # - [Prv] _excludedFromTransferContent # - [Prv] _transferFromExcluded # - [Prv] _excludedToTransferContent # - [Prv] _transferBothExcluded # - [Prv] _bothTransferContent # - [Prv] _reflectFee # - [Prv] _getValues - [Prv] _getTBasics - [Prv] getTTransferAmount - [Prv] _getRBasics - [Prv] _getRTransferAmount - [Prv] _getRate - [Prv] _getCurrentSupply - [Prv] _sendToCharity # - [Prv] removeAllFee # - [Prv] restoreAllFee # - [Prv] _getTaxFee
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What is a Solidity Audit?
Typically, a smart contract audit is a comprehensive review process designed to discover logical errors, security vulnerabilities, and optimization opportunities within code. A Solidity Audit takes this a step further by verifying economic logic to ensure the stability of smart contracts and highlighting privileged functionality to create a report that is easy to understand for developers and community members alike.
How Do I Interpret the Findings?
Each of our Findings will be labeled with a Severity level. We always recommend the team resolve High, Medium, and Low severity findings prior to deploying the code to the mainnet. Here is a breakdown on what each Severity level means for the project:
- High severity indicates that the issue puts a large number of users' funds at risk and has a high probability of exploitation, or the smart contract contains serious logical issues which can prevent the code from operating as intended.
- Medium severity issues are those which place at least some users' funds at risk and has a medium to high probability of exploitation.
- Low severity issues have a relatively minor risk association; these issues have a low probability of occurring or may have a minimal impact.
- Informational issues pose no immediate risk, but inform the project team of opportunities for gas optimizations and following smart contract security best practices.