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CryptoAgainstCancer - Audit Report

Summary

CryptoAgainstCancer Audit Report CryptoAgainstCancer is a new token with frictionless fee redistribution and charity contribution on each transfer featuring liquidity adds, BNB rewards, and a lottery system.

We audited CryptoAgainstCancer's token contract at 0x6fbFf934ec9D724450E66d9AcE621cb7E67CeB5A on the Binance Smart Chain mainnet.

Overview of the Contract:
  • The total supply of the token is set to one quadrillion.
  • No mint or burn functions are present; though the circulating supply can be reduced by sending tokens to the 0x..dead address, if desired.
  • The token is designed to be a governance token where 1 token = 1 vote.
  • Another contract will be needed to collect votes and execute transactions on behalf of the governance token holders.
  • Token holders can delegate their voting rights to any address. To save gas, users can also do so using an EIP-712 signature.
  • Pancakeswap holds ~65.6% of the token's supply as liquidity.
  • 96.6% of liquidity has been locked in an unverified contract.
  • 7% is held in the contract to be used for swap and liquify.

  • Fees are collected by the project team and are sent to the charity wallet and the dev marketing wallet.
  • Users who hold tokens will automatically receive a portion of the fees from a transaction tax on each transfer.
  • A portion of the fee charged on transactions is stored in the contract and, once a threshold value is met, used to fund PancakeSwap liqudity.
  • Liquidity-adds are funded by selling half of the tokens collected as fees, pairing the received BNB with the token, and adding it as liquidity to the BNB pair.
  • The recipient of the newly created LP tokens is the owner. We recommend that this liquidity is locked at the time of acquisition.
  • A final portion of the fees charged on transfers is used to fund BNB rewards, which will be claimable by token holders. This is also used to fund a lottery system, allowing users to win extra rewards on a psuedo-random basis.

  • Claims for BNB rewards are disabled for 3 days after launch, and the owner can disable claims for these rewards for 2 weeks at a time at will.
  • The owner of the contract can exclude and include users from transfer fees, set the maximum transfer amount, and update the fee percentages at any time.
  • The randomness function, to an extent, relies on predictable environment variables. This is common, albiet not best practice; but the probability of miners maliciously changing these variables is extremley low.
  • Some state variables could have been declared constant to save some gas.
  • Some functions could have been declared external instead of public to save some gas.
  • BNB claiming logic is properly structured to prevent reentrancy attacks.
  • The contract utilizes SafeMath libraries to prevent overflows along with following the BEP20 standard.

Audit Findings Summary
  • No security threats were identified.
  • Ensure trust in the team as they have some power in the ecosystem and will receive the LP tokens from liquidity-adds.
  • Date: June 22nd, 2021

Vulnerability Category Notes Result
Arbitrary Storage Write N/A PASS
Arbitrary Jump N/A PASS
Delegate Call to Untrusted Contract N/A PASS
Dependence on Predictable Variables Randomness relies on a series of environmental variables.
Probability of a negative impact is very low.
WARNING
Deprecated Opcodes N/A PASS
Ether Thief N/A PASS
Exceptions N/A PASS
External Calls N/A PASS
Flash Loans N/A PASS
Integer Over/Underflow N/A PASS
Multiple Sends N/A PASS
Oracles N/A PASS
Suicide N/A PASS
State Change External Calls N/A PASS
Unchecked Retval N/A PASS
User Supplied Assertion N/A PASS
Critical Solidity Compiler N/A PASS
Overall Contract Safety   PASS

BEP20 Token Graph

Multi-file Token

												
($) = payable function
 # = non-constant function

 + [Int] IBEP20 
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] transfer #
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transferFrom #

 + [Lib] SafeMath 
    - [Int] add
    - [Int] sub
    - [Int] sub
    - [Int] mul
    - [Int] div
    - [Int] div
    - [Int] mod
    - [Int] mod

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

 + [Lib] Address 
    - [Int] isContract
    - [Int] sendValue #
    - [Int] functionCall #
    - [Int] functionCall #
    - [Int] functionCallWithValue #
    - [Int] functionCallWithValue #
    - [Prv] _functionCallWithValue #

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

 + [Int] IPancakeFactory 
    - [Ext] feeTo
    - [Ext] feeToSetter
    - [Ext] getPair
    - [Ext] allPairs
    - [Ext] allPairsLength
    - [Ext] createPair #
    - [Ext] setFeeTo #
    - [Ext] setFeeToSetter #

 + [Int] IPancakePair 
    - [Ext] name
    - [Ext] symbol
    - [Ext] decimals
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transfer #
    - [Ext] transferFrom #
    - [Ext] DOMAIN_SEPARATOR
    - [Ext] PERMIT_TYPEHASH
    - [Ext] nonces
    - [Ext] permit #
    - [Ext] MINIMUM_LIQUIDITY
    - [Ext] factory
    - [Ext] token0
    - [Ext] token1
    - [Ext] getReserves
    - [Ext] price0CumulativeLast
    - [Ext] price1CumulativeLast
    - [Ext] kLast
    - [Ext] mint #
    - [Ext] burn #
    - [Ext] swap #
    - [Ext] skim #
    - [Ext] sync #
    - [Ext] initialize #

 + [Int] IPancakeRouter01 
    - [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] IPancakeRouter02 (IPancakeRouter01)
    - [Ext] removeLiquidityETHSupportingFeeOnTransferTokens #
    - [Ext] removeLiquidityETHWithPermitSupportingFeeOnTransferTokens #
    - [Ext] swapExactTokensForTokensSupportingFeeOnTransferTokens #
    - [Ext] swapExactETHForTokensSupportingFeeOnTransferTokens ($)
    - [Ext] swapExactTokensForETHSupportingFeeOnTransferTokens #

 +  ReentrancyGuard 
    - [Pub]  #

 +  CryptoAgainstCancer (Context, IBEP20, Ownable, ReentrancyGuard)
    - [Pub]  #
    - [Pub] name
    - [Pub] symbol
    - [Pub] decimals
    - [Pub] totalSupply
    - [Pub] balanceOf
    - [Pub] transfer #
    - [Pub] allowance
    - [Pub] approve #
    - [Pub] transferFrom #
    - [Pub] increaseAllowance #
    - [Pub] decreaseAllowance #
    - [Pub] isExcludedFromReward
    - [Pub] totalFees
    - [Pub] deliver #
    - [Pub] reflectionFromToken
    - [Pub] tokenFromReflection
    - [Pub] excludeFromReward #
       - modifiers: onlyOwner
    - [Ext] includeInReward #
       - modifiers: onlyOwner
    - [Prv] _getTxAmountMinusFee
    - [Prv] _getTValues
    - [Prv] _getRValues
    - [Pub] excludeFromFee #
       - modifiers: onlyOwner
    - [Pub] includeInFee #
       - modifiers: onlyOwner
    - [Ext] setTaxFeePercent #
       - modifiers: onlyOwner
    - [Ext] setLiquidityFeePercent #
       - modifiers: onlyOwner
    - [Ext] setDevMarketingFeePercentTenths #
       - modifiers: onlyOwner
    - [Ext] setCharityPercent #
       - modifiers: onlyOwner
    - [Pub] setSwapAndLiquifyEnabled #
       - modifiers: onlyOwner
    - [Ext]  ($)
    - [Prv] _reflectFee #
    - [Prv] _getValues
    - [Prv] _getRValues
    - [Prv] _getRate
    - [Prv] _getCurrentSupply
    - [Prv] _takeDevMarketingFee #
    - [Prv] _takeLiquidity #
    - [Pub] isExcludedFromFee
    - [Prv] _approve #
    - [Prv] _transfer #
    - [Prv] _tokenTransfer #
    - [Prv] _transferBothExcluded #
    - [Prv] _transferStandard #
    - [Prv] _transferToExcluded #
    - [Prv] _transferFromExcluded #
    - [Pub] setMaxTxPercent #
       - modifiers: onlyOwner
    - [Pub] setExcludeFromMaxTx #
       - modifiers: onlyOwner
    - [Pub] calculateBNBReward
    - [Pub] getRewardCycleBlock
    - [Pub] claimBNBReward #
       - modifiers: isHuman,nonReentrant
    - [Pub] toggleClaims #
       - modifiers: onlyOwner
    - [Prv] topUpClaimCycleAfterTransfer #
    - [Prv] ensureMaxTxAmount
    - [Pub] disruptiveTransfer ($)
    - [Prv] swapAndLiquify #
    - [Prv] calculateFeeTenth
    - [Prv] removeAllFee #
    - [Prv] restoreAllFee #
    - [Prv] _takeCharityFee #
    - [Pub] activateContract #
       - modifiers: onlyOwner
    - [Ext] delegates
    - [Ext] delegate #
    - [Ext] delegateBySig #
    - [Ext] getCurrentVotes
    - [Ext] getPriorVotes
    - [Int] _delegate #
    - [Int] _moveDelegates #
    - [Int] _writeCheckpoint #
    - [Int] safe32
    - [Int] getChainId
    - [Prv] random
    - [Prv] isLotteryWon
    - [Prv] calculateBNBReward
    - [Prv] calculateTopUpClaim
    - [Prv] swapTokensForEth #
    - [Prv] swapETHForTokens #
    - [Prv] addLiquidity #