Gambler Shiba - Smart Contract Audit Report

Summary

Gambler Shiba ($GSHIBA) is a new community-driven token on the Ethereum Blockchain that implements a tiered gambling system which pays rewards to its holders.

Gambler Shiba's Token contract is deployed at 0xb892249939adbf6d7851864ca9a5c7d2d537af97 on the Ethereum blockchain mainnet.

Notes on the Contract:
The total supply of the token is set to 1 trillion $GSHIBA [1,000,000,000,000].
No minting or burn functions are present; though the circulating supply can be reduced by sending tokens to the 0x..dead address, if desired.
At the time of writing this report, 8.66% of the total $GSHIBA token supply is in Uniswap liquidity.
Out of that liquidity, 100% of the LP tokens are stored in a token locking contract that will vest to the team October 21, 2021.
The top four holders account for 16.63% of the circulating supply.

The max transaction amount is 1 trillion $GSHIBA which is equal to the total token supply.
There is a 12% 'Dev Fee' charged on all transactions for any address that participates in a transfer.
The tokens collected through the dev fee are stored in the contract and, once a threshold value is met, the tokens (up to the maximum transaction amount) are sold for ETH and used to fund the project's gambling system.
33.33% of that ETH is split amongst the four winners. The remaining 66.67% will be sent to a wallet controlled by the team.
The breakdown of the 33.33% for the four winners is as follows:
The platinum tier winner will receive 13.33% of the ETH.
The gold tier winner will receive 9.99% of the ETH.
The silver tier winner will receive 6.66% of the ETH.
The bronze tier winner will receive 3.33% of the ETH.
To be eligible for rewards via the project's gambling system, your 'weight' must be above a threshold value (set by the governor) which qualifies you for a specific tier. Weight is calculated based on your purchased ETH amount and your $GSHIBA holdings.
The winners are decided using a pseudo-random number generator for each tier, and new winners will be picked once the wait time has elapsed.
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.
The contract also features cool-down functionality to enforce wait times between transfers and sells.

Although ownership has been renounced, the contract utilizes an 'OnlyGovernor' feature which restricts access of certain functions to only the assigned governor address. Any governor has the ability to add or remove other governors.
The governor of the contract can exclude and include accounts from the dev fee.
The governor has the ability to modify the tier weights to any value at any time.
The governor can sell the contract balance for ETH at any time.
The governor has the ability to bypass the wait time and transfer all of the ETH in the contract balance to the dev wallet and four winners.
The governor has the ability to set a migration contract at any time.
The contract utilizes SafeMath libraries along with following the ERC20 standard.
Audit Findings Summary
No external threats were identified.
Please ensure trust in the team prior to investing as they have substantial control in the ecosystem.
Date: August 6th, 2021

Audit Results

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	Decisions are made based on block-related environment variables which can be manipulated by a malicious miner. This is extremely unlikely to occur.	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

Function Graph

ERC20 Token Graph

Inheritence Chart

Multi-file Token

Functions Overview


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

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

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

 + [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] IUniswapV2Factory 
    - [Ext] createPair #

 + [Int] IUniswapV2Router02 
    - [Ext] swapExactTokensForETHSupportingFeeOnTransferTokens #
    - [Ext] factory
    - [Ext] WETH
    - [Ext] addLiquidityETH ($)
    - [Ext] getAmountsIn

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

 + [Lib] EnumerableSet 
    - [Prv] _add #
    - [Prv] _remove #
    - [Prv] _contains
    - [Prv] _length
    - [Prv] _at
    - [Prv] _values
    - [Int] add #
    - [Int] remove #
    - [Int] contains
    - [Int] length
    - [Int] at
    - [Int] values
    - [Int] add #
    - [Int] remove #
    - [Int] contains
    - [Int] length
    - [Int] at
    - [Int] values
    - [Int] add #
    - [Int] remove #
    - [Int] contains
    - [Int] length
    - [Int] at
    - [Int] values

 +  GShibaRNG (Ownable)
    - [Pub]  #
    - [Pub] checkTierFromWeight
    - [Pub] calcWeight
    - [Int] addNewWallet #
    - [Int] removeWallet #
    - [Int] addWalletToGamblingList #
    - [Int] removeWalletFromGamblingList #
    - [Prv] rand
    - [Int] checkAndChangeGamblingWinner #
    - [Ext] setEthWeight #
       - modifiers: onlyGoverner
    - [Ext] setTierWeights #
       - modifiers: onlyGoverner
    - [Ext] setFeeMinMax #
       - modifiers: onlyGoverner
    - [Pub] addGoverner #
       - modifiers: onlyGoverner
    - [Ext] removeGoverner #
       - modifiers: onlyGoverner
    - [Ext] addV1Users #
       - modifiers: onlyOwner

 +  GamblerShiba (IERC20, Ownable, GShibaRNG)
    - [Pub]  #
       - modifiers: GShibaRNG
    - [Pub] name
    - [Pub] symbol
    - [Pub] decimals
    - [Pub] totalSupply
    - [Pub] balanceOf
    - [Pub] transfer #
    - [Pub] allowance
    - [Pub] approve #
    - [Pub] transferFrom #
    - [Pub] increaseAllowance #
    - [Pub] decreaseAllowance #
    - [Pub] isBlackListed
    - [Ext] setExcludeFromFee #
       - modifiers: onlyGoverner
    - [Ext] addBotToBlackList #
       - modifiers: onlyOwner
    - [Ext] addBotsToBlackList #
       - modifiers: onlyOwner
    - [Ext] removeBotFromBlackList #
       - modifiers: onlyOwner
    - [Prv] removeAllFee #
    - [Prv] restoreAllFee #
    - [Pub] isExcludedFromFee
    - [Ext] setMaxTxPercent #
       - modifiers: onlyOwner
    - [Ext] setMaxTxAmount #
       - modifiers: onlyOwner
    - [Prv] _approve #
    - [Prv] _transfer #
    - [Prv] swapTokensForEth #
       - modifiers: lockTheSwap
    - [Prv] sendETHTodev #
    - [Ext] manualSwap #
       - modifiers: onlyGoverner
    - [Ext] manualSend #
       - modifiers: onlyGoverner
    - [Ext] setSwapEnabled #
       - modifiers: onlyOwner
    - [Prv] _tokenTransfer #
    - [Prv] _transferStandard #
    - [Prv] _takedev #
    - [Ext]  ($)
    - [Prv] _getMaxTxAmount
    - [Pub] _getETHBalance
    - [Ext] allowDex #
       - modifiers: onlyOwner
    - [Ext] toggleCoolDown #
       - modifiers: onlyOwner
    - [Ext] toggleFeeEnabled #
       - modifiers: onlyOwner
    - [Ext] setMigrationContract #
       - modifiers: onlyGoverner

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