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Euro Token Audit Report.

Security Audit Report

1. Summary

Euro Token smart contract security audit report performed by Callisto Security Audit Department

Deployed at

2. In scope

  • SREUR.sol github commit hash 662ec938265d2756943f306266e378f4de46ae88.

3. Findings

In total, 2 issues were reported including:

  • 2 low severity issues.

No critical security issues were found.

3.1. 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) );

3.2. Decrease Allowance

Severity: low


decreaseAllowance throw in case if the value to be substracted is higher than the amount that is allowed, if the address owner wants to change the value allowed by reducing it and the spender withdraw a part of it before, the function might throw and give more chances for the spender to take the rest of the allowed value.

The value should be set to zero if the value to be subtracted is higher than the allowance.

Code snippet

4. Conclusion

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

5. Revealing audit reports

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