Pixelmon Staking

Smart Contract Audit Report

Audit Summary

Pixelmon Staking Audit Report Pixelmon is building a new platform where users can stake NFTs and claim rewards.

For this audit, we reviewed the project team's PixelmonStaking contract at 0x217B53F8a059A5768aef26034b4A4ed2018d70f2 on the Ethereum Mainnet.

Audit Findings

No findings were identified, though some centralized aspects are present.
Date: September 14th, 2022.
Updated: November 3rd, 2022 to reflect the project's Mainnet address.

Contract Overview

  • Users can stake Pixelmon NFTs into the contract by specifying each NFT's token ID and providing a valid signature.
  • The returned signer address must have been added to the Signer role by the team in order for staking transactions to successfully occur.
  • The user is sent 1 first-range Pixelmon Trainer NFT for each staked token.
  • The team will set the Pixelmon and Pixelmon Trainer contracts upon deployment.
  • Users cannot stake more than 25 NFTs per transaction.
  • Each NFT can only ever be staked one time.
  • The team must ensure that the contract has a sufficient balance of first-range Pixelmon Trainer NFTs to support stakes.
  • Users can unstake any of their NFTs after the 21-day lock period has passed since staking.
  • Users cannot unstake more than 25 NFTs per transaction.
  • The owner can enable/disable Emergency mode at any time.
  • When Emergency mode is enabled, users can unstake any of their NFTs at any time without enforcing the lock period restriction.
  • The owner can add/remove addresses from the Signer role at any time.
  • The owner can pause/unpause the contract at any time which disables all staking and unstaking.
  • The owner can withdraw any NFTs (besides Pixelmon NFTs) from the contract at any time.
  • The contract utilizes ReentrancyGuard to prevent reentrancy attacks in applicable functions.

Audit Results

Vulnerability Category Notes Result
Arbitrary Jump/Storage Write N/A PASS
Centralization of Control The owner can pause all staking and unstaking at any time. 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Outdated Compiler Version N/A PASS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
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

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

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

 +  ReentrancyGuard 
    - [Pub]  #

 + [Int] IERC721Receiver 
    - [Ext] onERC721Received #

 + [Int] IERC165 
    - [Ext] supportsInterface

 + [Int] IERC721 (IERC165)
    - [Ext] balanceOf
    - [Ext] ownerOf
    - [Ext] safeTransferFrom #
    - [Ext] safeTransferFrom #
    - [Ext] transferFrom #
    - [Ext] approve #
    - [Ext] setApprovalForAll #
    - [Ext] getApproved
    - [Ext] isApprovedForAll

 + [Int] IPixelmonTrainer (IERC721)
    - [Ext] mintRangeTwo #

 + [Int] IAccessControl 
    - [Ext] hasRole
    - [Ext] getRoleAdmin
    - [Ext] grantRole #
    - [Ext] revokeRole #
    - [Ext] renounceRole #

 + [Lib] Math 
    - [Int] max
    - [Int] min
    - [Int] average
    - [Int] ceilDiv
    - [Int] mulDiv
    - [Int] mulDiv
    - [Int] sqrt
    - [Int] sqrt
    - [Int] log2
    - [Int] log2
    - [Int] log10
    - [Int] log10
    - [Int] log256
    - [Int] log256

 + [Lib] Strings 
    - [Int] toString
    - [Int] toHexString
    - [Int] toHexString
    - [Int] toHexString

 +  ERC165 (IERC165)
    - [Pub] supportsInterface

 +  AccessControl (Context, IAccessControl, ERC165)
    - [Pub] supportsInterface
    - [Pub] hasRole
    - [Int] _checkRole
    - [Int] _checkRole
    - [Pub] getRoleAdmin
    - [Pub] grantRole #
       - modifiers: onlyRole
    - [Pub] revokeRole #
       - modifiers: onlyRole
    - [Pub] renounceRole #
    - [Int] _setupRole #
    - [Int] _setRoleAdmin #
    - [Int] _grantRole #
    - [Int] _revokeRole #

 + [Lib] ECDSA 
    - [Prv] _throwError
    - [Int] tryRecover
    - [Int] recover
    - [Int] tryRecover
    - [Int] recover
    - [Int] tryRecover
    - [Int] recover
    - [Int] toEthSignedMessageHash
    - [Int] toEthSignedMessageHash
    - [Int] toTypedDataHash

 +  EIP712 
    - [Pub]  #
    - [Int] _domainSeparatorV4
    - [Prv] _buildDomainSeparator
    - [Int] _hashTypedDataV4

 +  PixelmonStaking (IERC721Receiver, Ownable, ReentrancyGuard, EIP712, AccessControl)
    - [Pub]  #
       - modifiers: EIP712
    - [Ext] setSigner #
       - modifiers: onlyOwner
    - [Pub] pause #
       - modifiers: onlyOwner
    - [Ext] unpause #
       - modifiers: onlyOwner
    - [Ext] toggleEmergencyMode #
       - modifiers: onlyOwner
    - [Ext] rescueNFT #
       - modifiers: onlyOwner,nonReentrant,validAddress,validAddress
    - [Ext] onERC721Received
    - [Pub] hashTokenIds
    - [Pub] verifyStakingSignature
    - [Ext] getChainID
    - [Ext] stake #
       - modifiers: nonReentrant,whenNotPaused,validInputLength
    - [Ext] unstake #
       - modifiers: nonReentrant,whenNotPaused,validInputLength
    - [Ext] emergencyUnstake #
       - modifiers: nonReentrant
    - [Pub] isTokenStaked
    - [Prv] _unstake #
    - [Prv] _uncheckedInc

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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.