Smart Contract Audit Report

Audit Summary

DefiGold Audit Report 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 as user.lastAccountingTimestampSec is already updated for the user in the updateAccountingUser() function.
user.lastAccountingTimestampSec = block.timestamp;
Recommendation: The team could remove the above line from the updateWeight() function for additional gas savings on each transfer.
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

Smart Contract Audit - Inheritance

Function Graph

Smart Contract Audit - 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.