MaxiMine Token (MXM) security audit, conducted by the Callisto Network Security Department in July 2019.


MaxiMine (MXM) Specificities




Audit Request

Audit Top 200 CoinMarketCap tokens.

Maximine Coin (MXM).

Source Code:

Disclosure policy:




Number of lines:



MaxiMine (MXM) Smart Contract Security Audit Report

Are Your Funds Safe?


1. In scope

2. Findings

In total, 5 issues were reported including:

  • 4 low severity issues.
  • 1 owner privilege (the ability of an owner to manipulate contract, may be risky for investors).

No critical security issues were found.

2.1. Known vulnerabilities of ERC-20 token

Severity: low.


  1. It is possible to double withdrawal attack. More details here.

  2. Lack of transaction handling mechanism issue. WARNING! This is a very common issue and it already caused millions of dollars losses for lots of token users! More details here.


Add the following code to the transfer(_to address, ...) function:

require( _to != address(this) );

2.2. ERC20 Compliance — event missing

Severity: low.


According to ERC20 standard when coins are minted(or burned) a Transfer event should be emitted.

Code snippet:

  • Line 41, 163, 181.

2.3. ERC20 Compliance — transfer returns

Severity: low.


According EIP20 Standard the transfer function should returns boolean value function transfer(address _to, uint256 _value) public returns (bool success). But here it is not implemented.

Code snippet.

  • Line 76.

2.4. ERC20 Compliance: zero-value transfers rejecting

Severity: low.


EIP20 says that:

Transfers of 0 values MUST be treated as normal transfers and fire the Transfer event.
But in this contract, function transfer has a condition:

require(balanceOf[_to] + _value > balanceOf[_to]);

Code snippet:

  • Line 56.

2.5. Owner Privileges

Severity: owner privileges.


The contract owner allowed to ban transfer functions for certain user.

Code snippet:

  • Line 86, 77, 111, 128.

3. Conclusion

The audited smart contract can be deployed. Only low severity issues were found during the audit.

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