Zilliqa Token (ZIL) security audit, conducted by the Callisto Network Security Department in April 2019.

 

Zilliqa (ZIL) Specificities

 

 

 

Audit Request

Audit Top 200 CoinMarketCap tokens.

Symbol      : ZIL
Name        : Zilliqa
Circulating Supply: 8 750 823 775
Total Supply: 12 599 999 804

https://www.zilliqa.com/

Deployed at:

https://etherscan.io/address/0x05f4a42e251f2d52b8ed15e9fedaacfcef1fad27#code

Source Code:

https://gist.github.com/yuriy77k/cd476ddc9a1c1685dc39e399fcd08b3e

Disclosure policy

Public.

Platform:

ETH.

Number of lines:

192.

 

Zilliqa Token (ZIL) Smart Contract Security Audit Report

Are Your Funds Safe?

 

1. In scope

2. Findings

In total, 3 issues were reported including:

  • 3 low severity issues.

2.1. Known vulnerabilities of ERC-20 token

Severity: low.

Description:

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

Recommendation:

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

require( _to != address(this) );

2.2. Transfer Admin to zero address

Severity: low.

Description:

Possibility of setting zero address as newAdnin at changeAdmin function.

Code snippet:

Recommendation:

Need to check if newOwner address is not zero address.

require( newAdmin != address(0) );

2.3. Owner Privileges

Severity: low.

Description:

The contract owner allow himself:

  • to pause functions of contract (transfer, transferFrom, approve, increaseApproval, decreaseApproval), besides burn function;
  • Evacuate Tokens at any time.

The contract is managed manually by the owner which is not good for investors.

Code snippet:

3. Conclusion

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

4. Revealing audit reports

Appendix

Smart Contract Audits by Callisto Network.

Miscellaneous

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