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# System prepended metadata

title: Xland Audit

---

# Xland Audit
## Info
- Auditor: mohamed moualim
- Commit hash: ...
git repository (commit hash)
## Disclaimers
## Issues
### ***Missing Events for Significant Transactions***
### [Informationnal]
**Description**
An event should be set for the signifiant transaction to track the call functions.
**Files**
* `contracts/xland.sol` (function L92,L97,L355,L376)

**Recommendation**
Put an event for every critical function that make signifiant transaction.
### ***Transfer unchecked***:
### [Medium]
**Description**
Cheking the result of the function will avoid the possibility of failure for the transaction.
**Files**
* `contracts/xland.sol` (function withdrawToken() L97:L100)

**Recommendation**
Ensure that the transfer's return value is checked or use SafeERC20.
### ***Missing address zero verification***
### [Medium]
**Description**
if the address verification isn't set, it can result to a zero in the PTOKEN's variable.
**Files**
* `contracts/xland.sol` (function setPTOKENContract L499:L501)

**Recommendations**
Put verification of the variable _address before changing PTOKENA's value.
### ***Usage of block.timestamp***
### [Informational]
**Description**
Block.timestamp is used in the contract. The variable block is a set of variables. The timestamp does not always reflect the current time and may be inaccurate. The value of a block can be influenced by miners.
**Files**
* `contracts/xland.sol` (function mint L135:L161 )

**Recommendation**
Verify that a delay of 900 seconds will not harm the logic of the contract.
### ***Using external***
### [Informationnal]
**Description**
Using the modifier external instead of public can reduce gas fees, but these function Cannot be accessed internally.
**Files**
* `contracts/xland.sol` (L92,L97,L232,L242)

**Recommendation**
Use external instead of public on the public function to reduce gas fees, these function Cannot be accessed internally and for this contract the public function are not used internally.

### ***Boolean equality***
### [Best Practice]
**Description**
Comparaison between two boolean can be replaced by the boolean directly in the condition.
**File(s)**
* `contracts/xland.sol` (L186)

**Recommendation**
Remove the comparaison.
You can use : 
require(! _exists(_ids[i]), "Lands were already minted" ) .