Smart Contract Audit Report

Audit Summary

LockYourCrypto is building a new platform where users can lock tokens or ETH for a specified period of time.

For this audit, we reviewed the Lock contract provided to us by the project team.

Audit Findings

No findings were identified.
Date: February 14th, 2023.

Contract Overview

  • Any user can initiate a token lock by specifying a token address, a token amount, and an unlock time.
  • The specified number of tokens is transferred from the caller to the contract. The user must grant the contract a sufficient allowance in order for the transaction to successfully occur.
  • Any user can initiate an ETH lock by specifying an unlock time and providing an amount of ETH that will be sent to the contract.
  • Any user that has initiated a lock can unlock their provided tokens or ETH by specifying the token address or the 0x000 address if the lock was with ETH.
  • If the unlock time has passed, the number of unlocked tokens or ETH will be sent from the contract to the caller's wallet address.
  • The contract includes support for fee-on-transfer tokens.
  • The contract utilizes ReentrancyGuard to prevent reentrancy attacks in applicable functions.
  • As the contract is implemented with Solidity v0.8.x, it is safe from any possible overflows/underflows.

Audit Results

Vulnerability Category Notes Result
Arbitrary Jump/Storage Write N/A PASS
Centralization of Control N/A PASS
Compiler Issues N/A PASS
Delegate Call to Untrusted Contract N/A PASS
Dependence on Predictable Variables N/A PASS
Ether/Token Theft N/A PASS
Flash Loans N/A PASS
Front Running N/A PASS
Improper Events N/A PASS
Improper Authorization Scheme N/A PASS
Integer Over/Underflow N/A PASS
Logical Issues N/A PASS
Oracle Issues N/A PASS
Outdated Compiler Version N/A PASS
Race Conditions N/A PASS
Reentrancy N/A PASS
Signature Issues N/A PASS
Sybil Attack N/A PASS
Unbounded Loops N/A PASS
Unused Code N/A PASS
Overall Contract Safety   PASS

Inheritance Chart

Smart Contract Audit - Inheritance

Function Graph

Smart Contract Audit - Graph

Functions Overview

 ($) = payable function
 # = non-constant function
 Int = Internal
 Ext = External
 Pub = Public

 + [Int] IERC20 
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] transfer #
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transferFrom #

 + [Int] IERC20Metadata (IERC20)
    - [Ext] name
    - [Ext] symbol
    - [Ext] decimals

 + [Int] IERC20Permit 
    - [Ext] permit #
    - [Ext] nonces

 + [Lib] Address 
    - [Int] isContract
    - [Int] sendValue #
    - [Int] functionCall #
    - [Int] functionCall #
    - [Int] functionCallWithValue #
    - [Int] functionCallWithValue #
    - [Int] functionStaticCall
    - [Int] functionStaticCall
    - [Int] functionDelegateCall #
    - [Int] functionDelegateCall #
    - [Int] verifyCallResultFromTarget
    - [Int] verifyCallResult
    - [Prv] _revert

 + [Lib] SafeERC20 
    - [Int] safeTransfer #
    - [Int] safeTransferFrom #
    - [Int] safeApprove #
    - [Int] safeIncreaseAllowance #
    - [Int] safeDecreaseAllowance #
    - [Int] safePermit #
    - [Prv] _callOptionalReturn #

 +  Context 
    - [Int] _msgSender
    - [Int] _msgData

 +  ReentrancyGuard 
    - [Pub]  #
    - [Prv] _nonReentrantBefore #
    - [Prv] _nonReentrantAfter #
    - [Int] _reentrancyGuardEntered

 +  Lock (Context, ReentrancyGuard)
    - [Pub]  #
       - modifiers: ReentrancyGuard
    - [Ext] lockToken #
       - modifiers: nonReentrant
    - [Ext] lockEther ($)
       - modifiers: nonReentrant
    - [Ext] unlock #
       - modifiers: nonReentrant
    - [Pub] getLockedTokens
    - [Pub] getTimersForToken

About SourceHat

SourceHat (formerly Solidity Finance - founded in 2020) has quickly grown to have one of the most experienced and well-equipped smart contract auditing teams in the industry. Our team has conducted 1700+ solidity smart contract audits covering all major project types and protocols, securing a total of over $50 billion U.S. dollars in on-chain value!
Our firm is well-reputed in the community and is trusted as a top smart contract auditing company for the review of solidity code, no matter how complex. Our team of experienced solidity smart contract auditors performs audits for tokens, NFTs, crowdsales, marketplaces, gambling games, financial protocols, and more!

Contact us today to get a free quote for a smart contract audit of your project!

What is a SourceHat Audit?

Typically, a smart contract audit is a comprehensive review process designed to discover logical errors, security vulnerabilities, and optimization opportunities within code. A SourceHat Audit takes this a step further by verifying economic logic to ensure the stability of smart contracts and highlighting privileged functionality to create a report that is easy to understand for developers and community members alike.

How Do I Interpret the Findings?

Each of our Findings will be labeled with a Severity level. We always recommend the team resolve High, Medium, and Low severity findings prior to deploying the code to the mainnet. Here is a breakdown on what each Severity level means for the project:

  • High severity indicates that the issue puts a large number of users' funds at risk and has a high probability of exploitation, or the smart contract contains serious logical issues which can prevent the code from operating as intended.
  • Medium severity issues are those which place at least some users' funds at risk and has a medium to high probability of exploitation.
  • Low severity issues have a relatively minor risk association; these issues have a low probability of occurring or may have a minimal impact.
  • Informational issues pose no immediate risk, but inform the project team of opportunities for gas optimizations and following smart contract security best practices.