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This is the report from a security audit performed on BAT by MrCrambo.

The audit focused primarily on the security of BAT smart contract.

In scope



In total, 3 issues was reported including:

  • 0 critical severity issues.

  • 0 high severity issues.

  • 1 medium severity issues.

  • 2 low severity issues.

1. Wrong event

Severity: medium


In function refund there is event comes before sending tokens at line 171, and if sending will be failed event log will be written to the blockchain.


Add event after tokens sending.

2. No time checking

Severity: low


In constructor there is no checking that _fundingStartBlock is less than _fundingEndBlock, so the dates could be wrong.

3. 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. More details here


Add into a function transfer(address _to, ... ) following code:

require( _to != address(this) );


Smart contract contains medium severity issue.

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