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This report has been prepared for Butter smart contracts, to discover issues and vulnerabilities in the source code of their Smart Contract as well as any contract dependencies that were not part of an officially recognized library. A comprehensive examination has been performed, utilizing Manual Review and Static Analysis techniques

Missing Emit Events

Unnecessary Array as Counter

Replace Libraries with InheritedContract in Contract Template

Variable Declare as Immutable

Divide by Zero

Does Not Move Delegates WhileTransferring Token

add() Function Not Restricted

Checks-effects-interactionsPattern Not Used

Variable Naming Convention

Recommended Explicit Pool ValidityChecks

Unknown Implementation ofmigrator.migrate()

Over Minted Token

Incompatibility With Deflationary Tokens

Lack of Input Validation

Redundant Variable

ButterSwap

Lack Of Input Validation

Meaningless Validation

Privileged Ownership

Proper Usage of `public` And `external` Type

Lack Of Judgment Conditions

Missing checks of `_startBlock`

Logical issue of the reward amount `treasury` sent to `BoardChef`

Centralization Risk

Lack of reasonable boundary

Boolean Equality

Code Reuse

Meaningless Calculation

Logical issue of `leaveStake`

Missing Zero Address Validation

Discussion For `withdraw` Function

Divide Before Multiply

Integer Overflow Risk

Risk For Weak Randomness

Redundant Data

ButterSwap II

IRandomNumberGenerator.sol

ILuckyLucky.sol

BoardToken.sol

contracts

IButterDao.sol

ButterVault.sol

LuckyLuckyChef.sol

RandomNumberGenerator.sol

BoardChef.sol

IMasterChef.sol

ButterDao.sol

DAOToken.sol

Pausable.sol

Unknown Imported Source File

Privileged ownership in `ButterBlindBoxFactory` contract

Centralized risk in `swapAndSendToFee`

SafeMath Not Used

3rd party dependencies

Redundant comparison against zero

Lack of input validation

Privileged ownership in `BlindBoxStruct` contract

Variable could be declared as `constant`

Declaration Naming Convention

Lack of document for special bonus

Limit the Execution of Function `safeMint`

Misleading Constructor

Limit the Execution of Function `safeMint` and `activateCard`

Privileged ownership in `DinnerTableChef` contract

Unused variable

Make initializer check stricter

ButterSwap Ⅲ

Function optimization

Lack of Event Emission for Significant Transactions

Transfer can be merged into one

Questionable cancel cost

ButterSwap IV

ButterSwap uses fully open-source smart contracts, and implements the full stack of Automatic Market Making (AMM) and yield farming system, to provide a one-stop DEX, liquidity mining and yield farming platform for crypto investors.

ButterSwap

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