HEAL

Smart Contract Audit Report

Audit Summary

HEAL Audit Report HEAL is creating a new staking contract which allows users to receive shares of deposited rewards.

For this audit, we reviewed HEAL's RewardsDistributor and RewardsTreasurySplitter contracts at commit da3ce5c726c8186a4b9fb91933e3d01be321fb90 on the team's private GitHub repository.

Audit Findings

Please ensure trust in the team prior to investing as they have substantial control in the ecosystem.
Date: March 17th, 2022.

Contracts Overview

  • As the contracts are implemented with Solidity v0.8.x, they are safe from any possible overflows/underflows.
RewardsDistributor Contract:
  • This contract allows users to stake a specified staking token in order to receive a share of deposited rewards in the form of the blockchain's native token.
  • When staking, users can also deposit NFTs from a specified collection in order to boost their rewards based on the "NFT boost percentage".
  • Users accumulate rewards when they are deposited into this contract.
  • A user's portion of deposited rewards is dependent on their share of total staked tokens.
  • After a minimum stake time has elapsed, a user can unstake any amount of their tokens.
  • Users must input "0" as the unstaking amount in order to have any staked NFTs transferred back to them; this will also withdraw all of their staking tokens.
  • A user's wait time to unstake is reset any time they stake additional tokens.
  • Users accumulate rewards based on their number of staked tokens when rewards are deposited into this contract.
  • When staking or unstaking, users can elect to either claim or forfeit their accumulated rewards.
  • Rewards can also be claimed separately through a claim function.
  • When claiming rewards, the user can elect to have their reward converted into staking tokens and staked back into the platform.
  • As the contract does not follow the Checks-Effects-Interactions pattern in the stake() and unstake() functions, the team should not use ERC-777 tokens as the staking token.
  • The team should note that if reward deposits are predictable, users are able to stake right before a reward deposit occurs to receive the rewards from it. Rewards should be deposited in small amounts to encourage users to remain staked in the contract.

  • The owner can update the NFT boost percentage at any time.
  • The owner can update the maximum NFTs to boost to any amount at any time.
  • The owner can update the NFT contract used for reward boosts at any time; this could potentially disallow users from withdrawing their staked NFTs.
  • The owner can update the staking token contract at any time; this could potentially disallow users from withdrawing their staked tokens.
  • The owner can update the minimum staking time at any time.
RewardsTreasurySplitter Contract:
  • This contract is intended to interact with the RewardsDistributor contract.
  • Any time this contract receives the blockchain's native token, a "treasury percentage" is taken and sent to a treasury address; the remaining amount is deposited into the RewardsDistributor contract as rewards.
  • The owner can update the treasury percentage to any amount at any time.
  • The owner can update the associated RewardsDistributor contract at any time.
  • The owner can withdraw any of the blockchain's native token from this contract.

Audit Results

Vulnerability CategoryNotesResult
Arbitrary Jump/Storage WriteN/APASS
Centralization of Control
  • The owner has the permissions mentioned above.
  • The owner can update the staking token or NFT contract at any time, potentially preventing users from withdrawing their staked tokens or NFTs.
  • The owner can update the RewardsTreasurySplitter's treasury fee to any amount at any time.
WARNING
Compiler IssuesN/APASS
Delegate Call to Untrusted ContractN/APASS
Dependence on Predictable VariablesN/APASS
Ether/Token TheftN/APASS
Flash LoansN/APASS
Front RunningN/APASS
Improper EventsN/APASS
Improper Authorization SchemeN/APASS
Integer Over/UnderflowN/APASS
Logical IssuesN/APASS
Oracle IssuesN/APASS
Outdated Compiler VersionN/APASS
Race ConditionsN/APASS
ReentrancyN/APASS
Signature IssuesN/APASS
Unbounded LoopsN/APASS
Unused CodeN/APASS
Overall Contract Safety PASS

RewardsDistributor Contract

Smart Contract Audit - Inheritance

Smart Contract Audit - Graph


 ($) = payable function
 # = non-constant function
 
  +  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] IERC165 
    - [Ext] supportsInterface

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

 + [Lib] SafeMath 
    - [Int] tryAdd
    - [Int] trySub
    - [Int] tryMul
    - [Int] tryDiv
    - [Int] tryMod
    - [Int] add
    - [Int] sub
    - [Int] mul
    - [Int] div
    - [Int] mod
    - [Int] sub
    - [Int] div
    - [Int] mod

 + [Int] IUniswapV2Router01 
    - [Ext] factory
    - [Ext] WETH
    - [Ext] addLiquidity #
    - [Ext] addLiquidityETH ($)
    - [Ext] removeLiquidity #
    - [Ext] removeLiquidityETH #
    - [Ext] removeLiquidityWithPermit #
    - [Ext] removeLiquidityETHWithPermit #
    - [Ext] swapExactTokensForTokens #
    - [Ext] swapTokensForExactTokens #
    - [Ext] swapExactETHForTokens ($)
    - [Ext] swapTokensForExactETH #
    - [Ext] swapExactTokensForETH #
    - [Ext] swapETHForExactTokens ($)
    - [Ext] quote
    - [Ext] getAmountOut
    - [Ext] getAmountIn
    - [Ext] getAmountsOut
    - [Ext] getAmountsIn

 + [Int] IUniswapV2Router02 (IUniswapV2Router01)
    - [Ext] removeLiquidityETHSupportingFeeOnTransferTokens #
    - [Ext] removeLiquidityETHWithPermitSupportingFeeOnTransferTokens #
    - [Ext] swapExactTokensForTokensSupportingFeeOnTransferTokens #
    - [Ext] swapExactETHForTokensSupportingFeeOnTransferTokens ($)
    - [Ext] swapExactTokensForETHSupportingFeeOnTransferTokens #

 + [Int] IRewardsDistributor 
    - [Ext] depositRewards ($)
    - [Ext] getShares
    - [Ext] getBoostNfts

 +  RewardDistributor (IRewardsDistributor, Ownable)
    - [Pub]  #
    - [Ext] stake #
    - [Prv] _stake #
    - [Ext] unstake #
    - [Ext] depositRewards ($)
    - [Int] distributeReward #
    - [Ext] claimReward #
    - [Int] getElevatedSharesWithBooster
    - [Pub] getBaseSharesFromBoosted
    - [Pub] getBoostPercentage
    - [Pub] eligibleForRewardBooster
    - [Pub] getUnpaid
    - [Int] getCumulativeRewards
    - [Ext] getBaseShares
    - [Ext] getShares
    - [Pub] getBoostNfts
    - [Ext] setShareholderToken #
       - modifiers: onlyOwner
    - [Ext] setMinSecondsBeforeUnstake #
       - modifiers: onlyOwner
    - [Ext] setNftBoosterToken #
       - modifiers: onlyOwner
    - [Ext] setNftBoostPercentage #
       - modifiers: onlyOwner
    - [Ext] setMaxNftsToBoost #
       - modifiers: onlyOwner
    - [Ext]  ($)



RewardsTreasurySplitter Contract

Smart Contract Audit - Inheritance

Smart Contract Audit - Graph


 ($) = payable function
 # = non-constant function
 
  +  Context 
    - [Int] _msgSender
    - [Int] _msgData

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

 + [Int] IRewardsDistributor 
    - [Ext] depositRewards ($)
    - [Ext] getShares
    - [Ext] getBoostNfts

 +  RewardsTreasurySplitter (Ownable)
    - [Pub]  #
    - [Ext] setRewards #
       - modifiers: onlyOwner
    - [Ext] setRewardsPercent #
       - modifiers: onlyOwner
    - [Ext] setTreasury #
       - modifiers: onlyOwner
    - [Ext] setTreasuryPercent #
       - modifiers: onlyOwner
    - [Ext] withdrawETH #
       - modifiers: onlyOwner
    - [Ext]  ($)

 

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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.