BNB Token Smart Contract Audit

Project Background

  • The BNB Token is native coin of the BNB Chain ecosystem. It is a utility token needed to use the BNB Chain platform. 
  • This Solidity contract is a token contract for a token named BNB. Here’s a summary of its functionality:
      • SafeMath Library: This contract includes a library called SafeMath which provides functions for safe arithmetic operations to prevent overflows and underflows.
      • BNB Token Contract: The BNB contract implements the functionality of the BNB token.
      • Token Properties: It defines properties such as name, symbol, decimals, and totalSupply for the token.
      • Balances: It maintains a mapping of token balances for each address (balanceOf), and another mapping to track frozen token balances (freezeOf).
    • Allowance: It allows another address to spend tokens on behalf of the token owner by using the approve function.
    • Token Transfer: Functions transfer and transferFrom are implemented for transferring tokens between addresses. These functions include checks to ensure that the sender has sufficient balance and that there are no overflows.
    • Token Burning: The burn function allows token holders to burn (destroy) their own tokens, reducing the total supply.
    • Token Freezing: It provides functions freeze and unfreeze to freeze and unfreeze tokens for a particular address. Frozen tokens cannot be transferred until they are unfrozen.
    • Withdraw Ether: The withdrawEther function allows the contract owner to withdraw any Ether balance held by the contract.
    • Fallback Function: The contract includes a payable fallback function to accept Ether transfers.
  • Overall, this contract provides the basic functionalities expected from an ERC-20 compatible token, along with additional features like token freezing and burning.


Executive Audit Summary

  • According to the standard audit assessment, Customer`s solidity smart contracts are “Secured”. This token contract has ownership control. It is ideal to renounce ownership once its purpose is over to make it fully decentralized.
  • We used various tools like Slither, Solhint and Remix IDE. At the same time this finding is based on critical analysis of the manual audit.
  • We found 0 critical, 0 high, 0 medium,  0 low and 4 very low level issues.

Audit Report in PDF


Audit Report Flip book

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