Yuna Token

Smart Contract Audit Report

Audit Summary

Yuna Token Audit Report Yuna Token is a new ERC-20 token on Ethereum.

For this audit, we reviewed the project team's YunaToken contract at 0x1C261D5B5566BBB489d93622D68a7D7964C72b0A on the Ethereum Mainnet.

Audit Findings

No findings were identified, though some centralized aspects are present.
Date: June 1st, 2023.

Contract Overview

  • The total supply of the token is currently 10 billion [10,000,000,000] $YUNA.
  • No mint functions are accessible beyond deployment.
  • Any user can burn their own tokens to reduce the total supply at any time.
  • At the time of writing this report, 100% of the total supply belongs to the owner.

  • Trading must be enabled by the team in order for all transfers to take place on the platform. Only whitelisted addresses can participate in transfers when trading is disabled.
  • The contract enforces a minimum holding amount which prevents a transfer from occurring if the sender's balance will be less than the minimum amount set by the team after the transfer occurs.
  • The contract features an anti-dump mechanism that ensures the total number of tokens sold or transferred by a user within the specified anti-dump time interval does not exceed the contract's current "anti-bear" limit. This limit is a percentage (determined by the owner) of the total number of tokens in the liquidity pool address.
  • If the anti-dump time interval has passed since the user's last sell or transfer, the number of tokens sold or transferred in a single transaction must not exceed the contract's current anti-bear limit.
  • As the contract is implemented with Solidity v0.8.x, it is protected from overflows/underflows.
  • The contract complies with the ERC-20 token standard.
Ownership Controls:
  • The owner can set the minimum holding amount to any value at any time.
  • The owner can pause/unpause all transfers at any time.
  • The owner can enable/disable the anti-dump mechanism at any time.
  • The owner can set the anti-dump threshold percentage and anti-dump time interval to any values at any time.
  • The owner can add/remove accounts from the contract's whitelist at any time.
  • The owner can update the Liquidity pool address used in the contract at any time.

Audit Results

Vulnerability Category Notes Result
Arbitrary Jump/Storage Write N/A PASS
Centralization of Control
  • The owner can set the minimum holding amount to any value at any time.
  • The owner can set the anti-dump threshold percentage and anti-dump time interval to any values at any time potentially restricting sells.
  • The owner can pause/unpause all transfers at any time.
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   WARNING

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

 +  Context 
    - [Int] _msgSender
    - [Int] _msgData

 +  Ownable (Context)
    - [Pub]  #
    - [Pub] owner
    - [Pub] renounceOwnership #
       - modifiers: onlyOwner
    - [Pub] transferOwnership #
       - modifiers: onlyOwner
    - [Int] _transferOwnership #

 + [Int] IERC20 
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] transfer #
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transferFrom #

 + [Int] IERC20Metadata (IERC20)
    - [Ext] name
    - [Ext] symbol
    - [Ext] decimals

 +  ERC20 (Context, 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] _transfer #
    - [Int] _mint #
    - [Int] _burn #
    - [Int] _approve #
    - [Int] _beforeTokenTransfer #
    - [Int] _afterTokenTransfer #

 +  YunaToken (Ownable, ERC20)
    - [Pub]  #
       - modifiers: ERC20
    - [Pub] whitelistAddr #
       - modifiers: onlyOwner
    - [Pub] setUniswap #
       - modifiers: onlyOwner
    - [Ext] setBearRules #
       - modifiers: onlyOwner
    - [Pub] setMevRules #
       - modifiers: onlyOwner
    - [Int] _beforeTokenTransfer #
    - [Ext] burn #
    - [Int] _antiBearLimit

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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.