Chain Colosseum is a Play to Earn Block Chain Game.
Unable to find manual contract audit (e.g. Certik, PeckShield, Solidity...)
SkillToken._swapColosAmount(address,uint256) (contracts/SkillToken.sol#108-116) uses a dangerous strict equality:
- penalty == 0 (contracts/SkillToken.sol#111)
SkillToken.getPenaltyPercent(address) (contracts/SkillToken.sol#76-88) uses a dangerous strict equality:
- block.number == holderInfo.avgTransactionBlock (contracts/SkillToken.sol#81)
Don't use strict equality to determine if an account has enough Ether or tokens.
Additional information: link
SkillToken.setSwapPenalty(uint256,uint256) (contracts/SkillToken.sol#67-70) should emit an event for:
- SWAP_PENALTY_MAX_PERIOD = maxPeriod (contracts/SkillToken.sol#68)
- SWAP_PENALTY_MAX_PER_SKILL = maxPerSkill.mul(1e10) (contracts/SkillToken.sol#69)
Emit an event for critical parameter changes.
Additional information: link
ColosToken.setupGame(address)._game (contracts/ColosToken.sol#54) lacks a zero-check on :
- game = _game (contracts/ColosToken.sol#55)
SkillToken.setupGame(address)._game (contracts/SkillToken.sol#55) lacks a zero-check on :
- game = _game (contracts/SkillToken.sol#56)
SkillToken.setupSale(address)._sale (contracts/SkillToken.sol#59) lacks a zero-check on :
- sale = _sale (contracts/SkillToken.sol#60)
Check that the address is not zero.
Additional information: link
Different versions of Solidity is used:
- Version used: ['>=0.6.0<0.8.0', '^0.6.0']
- >=0.6.0<0.8.0 (@openzeppelin/contracts/access/Ownable.sol#3)
- >=0.6.0<0.8.0 (@openzeppelin/contracts/math/SafeMath.sol#3)
- >=0.6.0<0.8.0 (@openzeppelin/contracts/token/ERC20/ERC20.sol#3)
- >=0.6.0<0.8.0 (@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol#3)
- >=0.6.0<0.8.0 (@openzeppelin/contracts/token/ERC20/IERC20.sol#3)
- >=0.6.0<0.8.0 (@openzeppelin/contracts/utils/Context.sol#3)
- ^0.6.0 (contracts/ColosToken.sol#2)
- ^0.6.0 (contracts/SkillToken.sol#2)
Use one Solidity version.
Additional information: link
Context._msgData() (@openzeppelin/contracts/utils/Context.sol#20-23) is never used and should be removed
ERC20._setupDecimals(uint8) (@openzeppelin/contracts/token/ERC20/ERC20.sol#287-289) is never used and should be removed
SafeMath.div(uint256,uint256,string) (@openzeppelin/contracts/math/SafeMath.sol#190-193) is never used and should be removed
SafeMath.mod(uint256,uint256) (@openzeppelin/contracts/math/SafeMath.sol#152-155) is never used and should be removed
SafeMath.mod(uint256,uint256,string) (@openzeppelin/contracts/math/SafeMath.sol#210-213) is never used and should be removed
SafeMath.tryAdd(uint256,uint256) (@openzeppelin/contracts/math/SafeMath.sol#24-28) is never used and should be removed
SafeMath.tryDiv(uint256,uint256) (@openzeppelin/contracts/math/SafeMath.sol#60-63) is never used and should be removed
SafeMath.tryMod(uint256,uint256) (@openzeppelin/contracts/math/SafeMath.sol#70-73) is never used and should be removed
SafeMath.tryMul(uint256,uint256) (@openzeppelin/contracts/math/SafeMath.sol#45-53) is never used and should be removed
SafeMath.trySub(uint256,uint256) (@openzeppelin/contracts/math/SafeMath.sol#35-38) is never used and should be removed
Remove unused functions.
Additional information: link
Pragma version>=0.6.0<0.8.0 (@openzeppelin/contracts/access/Ownable.sol#3) is too complex
Pragma version>=0.6.0<0.8.0 (@openzeppelin/contracts/math/SafeMath.sol#3) is too complex
Pragma version>=0.6.0<0.8.0 (@openzeppelin/contracts/token/ERC20/ERC20.sol#3) is too complex
Pragma version>=0.6.0<0.8.0 (@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol#3) is too complex
Pragma version>=0.6.0<0.8.0 (@openzeppelin/contracts/token/ERC20/IERC20.sol#3) is too complex
Pragma version>=0.6.0<0.8.0 (@openzeppelin/contracts/utils/Context.sol#3) is too complex
Pragma version^0.6.0 (contracts/ColosToken.sol#2) allows old versions
Pragma version^0.6.0 (contracts/SkillToken.sol#2) allows old versions
solc-0.6.5 is not recommended for deployment
Deploy with any of the following Solidity versions: 0.5.16 - 0.5.17, 0.6.11 - 0.6.12, 0.7.5 - 0.7.6 Use a simple pragma version that allows any of these versions. Consider using the latest version of Solidity for testing.
Additional information: link
Parameter ColosToken.setupSkill(SkillToken)._skill (contracts/ColosToken.sol#43) is not in mixedCase
Parameter ColosToken.setupGame(address)._game (contracts/ColosToken.sol#54) is not in mixedCase
Parameter ColosToken.swapToSkill(uint256)._amount (contracts/ColosToken.sol#59) is not in mixedCase
Parameter ColosToken.previewSwapSkillExpectedAmount(address,uint256)._holderAddress (contracts/ColosToken.sol#68) is not in mixedCase
Parameter ColosToken.previewSwapSkillExpectedAmount(address,uint256)._colosAmount (contracts/ColosToken.sol#68) is not in mixedCase
Parameter ColosToken.mint(address,uint256)._to (contracts/ColosToken.sol#85) is not in mixedCase
Parameter ColosToken.mint(address,uint256)._amount (contracts/ColosToken.sol#85) is not in mixedCase
Parameter SkillToken.setupGame(address)._game (contracts/SkillToken.sol#55) is not in mixedCase
Parameter SkillToken.setupSale(address)._sale (contracts/SkillToken.sol#59) is not in mixedCase
Parameter SkillToken.setupColos(ColosToken)._colos (contracts/SkillToken.sol#63) is not in mixedCase
Parameter SkillToken.getPenaltyPercent(address)._holderAddress (contracts/SkillToken.sol#76) is not in mixedCase
Parameter SkillToken.swapToColos(uint256)._amount (contracts/SkillToken.sol#91) is not in mixedCase
Parameter SkillToken.previewSwapColosExpectedAmount(address,uint256)._holderAddress (contracts/SkillToken.sol#103) is not in mixedCase
Parameter SkillToken.previewSwapColosExpectedAmount(address,uint256)._skillAmount (contracts/SkillToken.sol#103) is not in mixedCase
Parameter SkillToken.mint(address,uint256)._to (contracts/SkillToken.sol#140) is not in mixedCase
Parameter SkillToken.mint(address,uint256)._amount (contracts/SkillToken.sol#140) is not in mixedCase
Variable SkillToken.SWAP_PENALTY_MAX_PERIOD (contracts/SkillToken.sol#22) is not in mixedCase
Variable SkillToken.SWAP_PENALTY_MAX_PER_SKILL (contracts/SkillToken.sol#23) is not in mixedCase
Follow the Solidity naming convention.
Additional information: link
Redundant expression "this (@openzeppelin/contracts/utils/Context.sol#21)" inContext (@openzeppelin/contracts/utils/Context.sol#15-24)
Remove redundant statements if they congest code but offer no value.
Additional information: link
ColosToken.constructor() (contracts/ColosToken.sol#16-19) uses literals with too many digits:
- _mint(address(this),1000000 * (10 ** uint256(decimals()))) (contracts/ColosToken.sol#17)
ColosToken._transfer(address,address,uint256) (contracts/ColosToken.sol#91-106) uses literals with too many digits:
- recipient == 0x000000000000000000000000000000000000dEaD (contracts/ColosToken.sol#93)
SkillToken.constructor(uint256,uint256) (contracts/SkillToken.sol#27-32) uses literals with too many digits:
- _mint(address(this),1000000 * (10 ** uint256(decimals()))) (contracts/SkillToken.sol#30)
SkillToken._transfer(address,address,uint256) (contracts/SkillToken.sol#147-164) uses literals with too many digits:
- recipient == 0x000000000000000000000000000000000000dEaD (contracts/SkillToken.sol#150)
Use: Ether suffix, Time suffix, or The scientific notation
Additional information: link
renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (@openzeppelin/contracts/access/Ownable.sol#54-57)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (@openzeppelin/contracts/access/Ownable.sol#63-67)
name() should be declared external:
- ERC20.name() (@openzeppelin/contracts/token/ERC20/ERC20.sol#64-66)
symbol() should be declared external:
- ERC20.symbol() (@openzeppelin/contracts/token/ERC20/ERC20.sol#72-74)
transfer(address,uint256) should be declared external:
- ERC20.transfer(address,uint256) (@openzeppelin/contracts/token/ERC20/ERC20.sol#115-118)
approve(address,uint256) should be declared external:
- ERC20.approve(address,uint256) (@openzeppelin/contracts/token/ERC20/ERC20.sol#134-137)
transferFrom(address,address,uint256) should be declared external:
- ERC20.transferFrom(address,address,uint256) (@openzeppelin/contracts/token/ERC20/ERC20.sol#152-156)
increaseAllowance(address,uint256) should be declared external:
- ERC20.increaseAllowance(address,uint256) (@openzeppelin/contracts/token/ERC20/ERC20.sol#170-173)
decreaseAllowance(address,uint256) should be declared external:
- ERC20.decreaseAllowance(address,uint256) (@openzeppelin/contracts/token/ERC20/ERC20.sol#189-192)
burn(uint256) should be declared external:
- ERC20Burnable.burn(uint256) (@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol#21-23)
burnFrom(address,uint256) should be declared external:
- ERC20Burnable.burnFrom(address,uint256) (@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol#36-41)
Use the external attribute for functions never called from the contract.
Additional information: link
Number of Binance Smart Chain (BSC) token holders is low.
Token is deployed only at one blockchain
Token has only one trading pair
Contract has 5% buy tax and 5% sell tax.
Taxes are low and contract ownership is renounced.
Unable to find PancakeSwap trading pair to compute liquidity.
Unable to find PancakeSwap trading pair to compute number of swaps.
Unable to find token contract audit
Unable to find audit link on the website
Unable to find whitepaper link on the website
Unable to find token on CoinHunt
Additional information: link
Young tokens have high risks of price dump / death
Young tokens have high risks of scam / price dump / death
Young tokens have high risks of price dump / death
Young tokens have high risks of price dump / death
Young tokens have high risks of price dump / death
Token has relatively low CoinGecko rank
Token has relatively low CoinMarketCap rank
Unable to find Youtube account