DefiGold
Smart Contract Audit Report
Audit Summary
DefiGold is a new BEP-20 on the Binance Smart Chain.
For this audit, we reviewed the project team's DGOLD contract at 0x24AeF4416Ff267AfC2d9Fe9141C1002555bed0a6 on the Binance Smart Chain Mainnet.
Audit Findings
All findings have been resolved.
Date: April 10th, 2023.
Updated: April 12th, 2023 to reflect the contract's Mainnet address.
Updated: April 28th, 2023 to reflect the contract's newly deployed Mainnet address.Finding #1 - ERC20 - Informational (Resolved)
Description: The following line in the updateWeight() function is redundant asuser.lastAccountingTimestampSec
is already updated for the user in the updateAccountingUser() function.
Recommendation: The team could remove the above line from the updateWeight() function for additional gas savings on each transfer.user.lastAccountingTimestampSec = block.timestamp;
Resolution: The team has implemented the above recommendation.
Finding #2 - ERC20 - Informational (Resolved)
Description: The_initialWeightPerToken
state variable cannot be modified but is not declared constant.
Recommendation: The above state variable could be declared constant for additional gas savings on each reference.
Resolution: The team has declared_initialWeightPerToken
constant.
Finding #3 - ERC20 - Informational (Resolved)
Description: Although the SafeMath library is utilized, the contract is implemented with Solidity v0.8.x which has built-in overflow checks.
Recommendation: SafeMath could be safely removed to reduce contract size, deployment costs, and gas costs on all transactions that utilize it.
Resolution: The team has removed the SafeMath library from the contract.
Contract Overview
- The total supply of the token is set to 79 million $GOLD [79,000,000].
- No mint or burn functions are accessible, though the circulating supply can be decreased by sending tokens to the 0x..dead address.
- At the time of writing this report, 100% of the total supply belongs to the owner.
- A minted weight value for each transfer is calculated based on the number of tokens being transferred and the token's current circulating supply.
- The minted weight value is added to both the recipient's and the contract's total weight. Both the recipient's and the contract's total weight-seconds values are updated based on each of their total weights and the amount of time that has passed since their weights were previously calculated.
- A new "hodl" is added on behalf of the recipient which stores the transfer's minted weight value and time of the transaction.
- A burned weight value is calculated based on the number of tokens being transferred and the token's current circulating supply.
- The burned weight value is decreased from the weight value of the sender's last hodl(s).
- Both the sender's and the contract's total weight and weight-seconds values are decreased by the calculated burn amounts.
- The weight values associated with the contract and each user can be used off-chain by the team.
- The owner can exclude and include accounts from the weight functionality on transfers at any time.
- The owner can update the BitFund address at any time.
- As the contract is implemented with Solidity v0.8.x, it is protected from overflows/underflows.
- The contract complies with the BEP-20 token standard.
Audit Results
Vulnerability Category | Notes | Result |
---|---|---|
Arbitrary Jump/Storage Write | N/A | PASS |
Centralization of Control | N/A | PASS |
Compiler Issues | N/A | PASS |
Delegate Call to Untrusted Contract | N/A | PASS |
Dependence on Predictable Variables | N/A | PASS |
Ether/Token Theft | N/A | PASS |
Flash Loans | N/A | PASS |
Front Running | N/A | PASS |
Improper Events | N/A | PASS |
Improper Authorization Scheme | N/A | PASS |
Integer Over/Underflow | N/A | PASS |
Logical Issues | N/A | PASS |
Oracle Issues | N/A | PASS |
Outdated Compiler Version | N/A | PASS |
Race Conditions | N/A | PASS |
Reentrancy | N/A | PASS |
Signature Issues | N/A | PASS |
Sybil Attack | N/A | PASS |
Unbounded Loops | N/A | PASS |
Unused Code | N/A | PASS |
Overall Contract Safety | PASS |
Inheritance Chart
Function Graph
Functions Overview
($) = payable function
# = non-constant function
Int = Internal
Ext = External
Pub = Public
+ [Int] IERC20
- [Ext] totalSupply
- [Ext] balanceOf
- [Ext] transfer #
- [Ext] allowance
- [Ext] approve #
- [Ext] transferFrom #
+ [Int] IERC20Metadata (IERC20)
- [Ext] name
- [Ext] symbol
- [Ext] decimals
+ Context
- [Int] _msgSender
- [Int] _msgData
+ Ownable (Context)
- [Pub] #
- [Pub] owner
- [Int] _checkOwner
- [Pub] renounceOwnership #
- modifiers: onlyOwner
- [Pub] transferOwnership #
- modifiers: onlyOwner
- [Int] _transferOwnership #
+ [Int] IFactory
- [Ext] createPair #
- [Ext] getPair
+ [Int] IRouter
- [Ext] factory
- [Ext] WETH
+ DGOLD (Ownable, IERC20, IERC20Metadata)
- [Pub] #
- [Pub] name
- [Pub] symbol
- [Pub] decimals
- [Pub] totalSupply
- [Pub] balanceOf
- [Pub] transfer #
- [Pub] allowance
- [Pub] approve #
- [Pub] transferFrom #
- [Pub] increaseAllowance #
- [Pub] decreaseAllowance #
- [Int] totalAmount
- [Int] updateAccountingTotal #
- [Int] updateAccountingUser #
- [Int] updateWeight #
- [Int] _transfer #
- [Int] _mint #
- [Int] _approve #
- [Int] _spendAllowance #
- [Int] _beforeTokenTransfer #
- [Int] _afterTokenTransfer #
- [Ext] setWeightExempt #
- modifiers: onlyOwner
- [Ext] setBitFund #
- modifiers: onlyOwner
- [Ext] getWeightsInfo
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What is a SourceHat Audit?
Typically, a smart contract audit is a comprehensive review process designed to discover logical errors, security vulnerabilities, and optimization opportunities within code. A SourceHat 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.