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COLOS [ChainColosseum] Token

About COLOS

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Token 6 months
CoinMarketCap 5 months
white paper

Chain Colosseum is a Play to Earn Block Chain Game.

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Laser Scorebeta Last Audit: 18 February 2022

report
Code:


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

Holders:


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 Youtube account

Search:


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

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