🎯 Objective
Audit the Product Voting Contract, a Soroban-based smart contract designed to facilitate decentralized product feedback through upvotes and downvotes. It implements real-time ranking, vote history tracking, spam prevention, and dynamic trend analysis—all with strong anti-abuse protections and strict voting limits.
🏗 Contract Structure
product-voting-contract/src/
lib.rs // Main contract logic and entry points
vote.rs // Voting system and state transitions
ranking.rs // Product scoring and trending calculations
limits.rs // Vote restriction enforcement
types.rs // Enums, vote types, and data models
test.rs // Unit tests
🔍 Audit Scope by Component
1️⃣ Product Management
2️⃣ Voting Operations
3️⃣ Voting Limits & Eligibility
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Module: limits.rs
-
Checks:
- Daily limit of 10 votes per user
- Account creation time must exceed minimum age
- Block multiple votes on same product
- Time-based validation: no votes allowed beyond product's voting window
- Prevent cast_vote bypass via replay or stale state
4️⃣ Ranking & Trending System
5️⃣ Data Tracking & Audit Trail
🔐 Security Considerations
-
Authorization:
- Prevent unauthorized function access or misuse
- Validate input types and limits strictly (vote types, product IDs)
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Anti-Gaming Protections:
- Minimum account age prevents bots or rapid voting
- Daily vote limits mitigate coordinated vote farming
- Reversal window prevents abuse of trending calculations
-
Vote History Integrity:
- Store every vote with timestamp and voter ID
- Prevent vote deletion or hidden alterations
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Input Validation:
- No empty or malformed symbols or names
- No invalid timestamps or vote types
📋 Error Handling
The contract implements detailed error codes. Audit checks should ensure:
-
Each Result::Err path corresponds to well-scoped input validations
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Unrecoverable errors (ProductNotFound) are enforced early
-
Test coverage for all errors:
VotingPeriodEndedAlreadyVotedReversalWindowExpiredDailyLimitReachedAccountTooNewProductNotFoundProductExists
📊 Voting Logic Summary
| Vote Type |
Value |
Effect |
| Upvote |
1 |
Adds score |
| Downvote |
2 |
Subtracts score |
| Modify |
Within 24h |
Allowed |
| Limit |
10/day |
Enforced |
✅ Testing Recommendations
- Create a product and cast votes within and beyond voting window
- Attempt duplicate votes and ensure they’re rejected
- Modify vote within 24h and ensure reversal logic is accurate
- Simulate new accounts voting and ensure enforcement of age check
- Monitor trending output with burst activity and decay logic
- Test daily vote cap with multiple products in one session
📌 Additional Notes
- Suggest including vote weight modifiers based on user level or activity in future versions
- Potential integration with external product catalogs or e-commerce platforms
- For transparency, consider emitting events for each vote and rank change
- Explore real-time trending caching for performance enhancement
🎯 Objective
Audit the Product Voting Contract, a Soroban-based smart contract designed to facilitate decentralized product feedback through upvotes and downvotes. It implements real-time ranking, vote history tracking, spam prevention, and dynamic trend analysis—all with strong anti-abuse protections and strict voting limits.
🏗 Contract Structure
🔍 Audit Scope by Component
1️⃣ Product Management
Function:
create_product(env, id, name)Checks:
2️⃣ Voting Operations
Function:
cast_vote(env, product_id, vote_type, voter)Checks:
3️⃣ Voting Limits & Eligibility
Module:
limits.rsChecks:
4️⃣ Ranking & Trending System
Functions:
get_product_score,get_trending_productsChecks:
5️⃣ Data Tracking & Audit Trail
Implied by structure: vote history tracking per user/product
Checks:
🔐 Security Considerations
Authorization:
Anti-Gaming Protections:
Vote History Integrity:
Input Validation:
📋 Error Handling
The contract implements detailed error codes. Audit checks should ensure:
Each
Result::Errpath corresponds to well-scoped input validationsUnrecoverable errors (ProductNotFound) are enforced early
Test coverage for all errors:
VotingPeriodEndedAlreadyVotedReversalWindowExpiredDailyLimitReachedAccountTooNewProductNotFoundProductExists📊 Voting Logic Summary
12✅ Testing Recommendations
📌 Additional Notes