Holo Token (HOT) security audit, conducted by the Callisto Network Security Department in June 2019.
Holo (HOT) Specificities
Audit Request
Audit Top 200 CoinMarketCap tokens.
Holo (HOT)
Deployed at https://etherscan.io/address/0x6c6ee5e31d828de241282b9606c8e98ea48526e2#contracts
Source Code:
Disclosure policy:
Public.
Platform:
ETH.
Number of lines:
142.
Holo Token (HOT) Smart Contract Security Audit Report
Are Your Funds Safe?
1. In scope
2. Findings
In total, 3 issues were reported including:
-
2 low severity issues.
-
1 owner privileges (the ability of an owner to manipulate contract, may be risky for investors).
No critical security issues were found.
2.1. Known Issue of ERC20 Standard
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. Zero address checking
Severity: low.
Description:
There are no zero address checking in functions setMinter at line 239, setDestroyer at line 269 and mint at line 243.
Code snippet:
https://github.com/NatminPureEscrow/Token/blob/master/contracts/NatminToken.sol#L231
https://github.com/NatminPureEscrow/Token/blob/master/contracts/NatminToken.sol#L231
2.3. Owner privileges
Severity: owner privileges.
Description:
Owner can mint any amount of tokens and for a long period of time, because he can not finish minting and can set himself as minter.
3. Conclusion
The audited smart contract can be deployed. Only low severity issues were found during the audit.
4.Revealing audit reports
https://gist.github.com/yuriy77k/c6a8d409a858f6155780ea7f4addd097
https://gist.github.com/yuriy77k/dcea1e26ba3e6e73e5e51a77e5d241d3
https://gist.github.com/yuriy77k/4afef9710e08a8a9030e58c8590019b6
Appendix
Smart Contract Audits by Callisto Network.
Miscellaneous
Our Most Popular Audit Reports.
Trust the Blockchain, Audit the Smart Contracts.
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