NFT Marketplace with Royalty Enforcement and Secure Minting Workflows
A creator focused brand wanted an NFT marketplace with reliable minting, royalties, and a clean user experience. We delivered audited contracts, a marketplace frontend, and a backend indexing layer that kept user state consistent while preventing common exploit paths.
Confidential engagement. NDA available upon request.
0
Critical Issues at Launch
2
Smart Contracts
12
Weeks to Launch
99.9%
Availability Target
About the Client
Industry
Digital Collectibles
Company Size
10 to 30 contributors
Background
A creator brand launching digital collectibles with a marketplace experience. The priority was security, predictable minting behavior, and a smooth purchase flow for non technical users.
Key Risks Identified
Minting and pricing edge cases
The minting flow needed guardrails for supply limits, allowlists, and pricing rules under heavy traffic.
Royalty enforcement expectations
Royalties needed clear rules and predictable behavior across transfers and marketplace actions.
Indexing and state accuracy
The marketplace required accurate ownership and listing status across on chain events.
User safety
The UX had to reduce user errors during approvals and transactions while handling failed transactions gracefully.
The Mission
Build a secure NFT marketplace with audited minting and royalty logic, accurate indexing, and a user experience that stays clear under real world conditions.
How We Approached It
01. Contract and threat modeling
Week 1 to 3- Minting rules and access control design
- Threat modeling for approvals and transfers
- Test plan and invariants definition
- Deployment strategy and key management plan
02. Build and testing
Week 4 to 10- Smart contract implementation and tests
- Marketplace frontend build and wallet flows
- Indexing service for event processing and state
- Internal security review and remediation
03. Audit support and launch
Week 11 to 12- Audit findings remediation and retesting
- Mainnet deployment and verification
- Monitoring and alerts for key events
- Launch support and stabilization
Vulnerabilities Discovered
0
CRITICAL
2
HIGH
2
MEDIUM
1
LOW
Approval scope too broad
Initial flows risked granting approvals that exceeded required scope for marketplace actions.
Initial flows risked granting approvals that exceeded required scope for marketplace actions.
Listing state desync risk
Certain edge cases could desync listing state without careful indexing reconciliation.
Certain edge cases could desync listing state without careful indexing reconciliation.
Minting limits required stricter enforcement
Supply and allowlist checks needed stronger constraints to prevent unexpected mint behavior.
Supply and allowlist checks needed stronger constraints to prevent unexpected mint behavior.
Transaction feedback clarity
Users needed clearer messaging for pending, failed, and replaced transactions.
Users needed clearer messaging for pending, failed, and replaced transactions.
Operational documentation gaps
Runbooks for key rotation and incident response needed expansion.
Runbooks for key rotation and incident response needed expansion.
How We Fixed It
Safer approval flows
Reduced approval scope and added clearer UX to prevent accidental over approvals.
Indexing reconciliation
Implemented event processing with reconciliation and retries to keep marketplace state accurate.
Contract hardening
Expanded tests and invariants around minting limits, royalties, and access control.
Measurable Outcomes
The marketplace launched with audited contracts, stable indexing, and a purchase flow designed for trust and clarity.
0
Critical Issues at Launch
12
Weeks to Launch
99.9%
Availability Target
100%
Key Events Monitored
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