Audit Comp | Belong-logo

Audit Comp | Belong

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Belong is building the world’s first performance-based affiliate network for physical businesses, combining real-world experiences with on-chain technology to transform how venues, promoters, and customers interact.

Cairo
Solidity

Live

8d: 4h remaining
Primary Pool
$21,000
All Stars Pool
$6,000
Podium Pool
$3,000
Start Date
20 October 2025
End Date
29 October 2025
Rewards Token
USDC
Lines of Code
4,108
  • Triaged by Immunefi

  • Step-by-step PoC Required

Select the category you'd like to explore

Assets in Scope

Target
Type
Smart Contract - Structures.sol
Added on
20 October 2025
Target
Type
Smart Contract - Escrow.sol
Added on
20 October 2025
Target
Type
Smart Contract - RoyaltiesReceiverV2.sol
Added on
20 October 2025
Target
Type
Smart Contract - Staking.sol
Added on
20 October 2025
Target
Type
Smart Contract - VestingWalletExtended.sol
Added on
20 October 2025
Target
Type
Smart Contract - BelongCheckIn.sol
Added on
20 October 2025
Target
Type
Smart Contract - Factory.sol
Added on
20 October 2025
Target
Type
Smart Contract - ReferralSystemV2.sol
Added on
20 October 2025
Target
Type
Smart Contract - AccessToken.sol
Added on
20 October 2025
Target
Type
Smart Contract - CreditToken.sol
Added on
20 October 2025
Target
Type
Smart Contract - ERC1155Base.sol
Added on
20 October 2025
Target
Type
Smart Contract - Helper.sol
Added on
20 October 2025

Impacts in Scope

Build Commands, Test Commands, and How to Run Them

https://github.com/belongnet/checkin-contracts/tree/main/docs/guides

Asset Accuracy Assurance

Bugs found on assets incorrectly listed in-scope are valid.

Code Freeze Assurance

Code of the assets in scope is frozen while the program is live.

Duplicate submissions of bugs are valid. Duplicate submissions of Insights are invalid.

The project commits to keeping private all info related to bug findings until this program is over. This means the project will not leak info about any bug findings or planned bug fixes, including bug findings found independently by the project or from concurrent private audits.


Previous Audits

Belong’s completed audit reports can be found at https://hacken.io/audits/belong-net/. Unfixed vulnerabilities mentioned in these reports are not eligible for a reward.

Private Known Issues Reward Policy

Private known issues, meaning known issues that were not publicly disclosed, are valid for a reward.


Where might Security Researchers confuse out-of-scope code to be in-scope?

Smart contracts only from ./contracts/v2 should be audited. LONG.sol has been built by OZ Wizard.

Is this an upgrade of an existing system? If so, which? And what are the main differences?

Factory has been updated from the previous version, which stored token and royalties receiver codes within itself. Currently, Factory utilises a minimal proxy clone deployment.

What ERC20 / ERC721 / ERC777 / ERC1155 token standards are supported?

  • LONG.sol - ERC20
  • CreditToken.sol - ERC1155
  • AccessToken.sol - ERC721

Which chains and/or networks will the code in scope be deployed to?

BNB Smart Chain

What external dependencies are there?

  • Solady library.
  • Uniswap/Pancakeswap V3.

What are the most valuable educational resources already available? (Ie. Documentation, Explainer videos or articles, etc)

Documentation can be found in: ./docs/ folder.

Severity
Critical
Title

Direct theft of any user funds, whether at-rest or in-motion, other than unclaimed yield

Severity
Critical
Title

Direct theft of any user NFTs, whether at-rest or in-motion, other than unclaimed royalties

Severity
Critical
Title

Permanent freezing of funds

Severity
Critical
Title

Permanent freezing of NFTs

Severity
Critical
Title

Unauthorized minting of NFTs

Severity
Critical
Title

Unintended alteration of what the NFT represents (e.g. token URI, payload, artistic content)

Severity
Critical
Title

Protocol insolvency

Severity
High
Title

Permanent freezing of unclaimed royalties

Severity
High
Title

Permanent freezing of unclaimed yield

Severity
High
Title

Theft of unclaimed royalties

Severity
High
Title

Theft of unclaimed yield

Severity
High
Title

Temporary freezing of funds for at least 24 hour

Out of scope

Default Out of Scope and rules

Smart Contract specific

  • Incorrect data supplied by third party oracles
    • Not to exclude oracle manipulation/flash loan attacks
  • Impacts requiring basic economic and governance attacks (e.g. 51% attack)
  • Lack of liquidity impacts
  • Impacts from Sybil attacks
  • Impacts involving centralization risks

All categories

  • Impacts requiring attacks that the reporter has already exploited themselves, leading to damage
  • Impacts caused by attacks requiring access to leaked keys/credentials
  • Impacts caused by attacks requiring access to privileged addresses (including, but not limited to: governance and strategist contracts) without additional modifications to the privileges attributed
  • Impacts relying on attacks involving the depegging of an external stablecoin where the attacker does not directly cause the depegging due to a bug in code
  • Mentions of secrets, access tokens, API keys, private keys, etc. in Github will be considered out of scope without proof that they are in-use in production
  • Best practice recommendations
  • Feature requests
  • Impacts on test files and configuration files unless stated otherwise in the bug bounty program
  • Impacts requiring phishing or other social engineering attacks against project's employees and/or customers