We architect and deploy custom smart contracts that power your core business logic, from tokenomics to complex DeFi protocols. Our focus is on security-first development, leveraging battle-tested libraries like OpenZeppelin and rigorous audit processes.
LABS
Services
StarkNet Cairo ZK-Reputation Contracts
We develop custom Cairo smart contracts for StarkNet that use Zero-Knowledge proofs to verify user compliance (KYC, AML, credit) without revealing the underlying private data, enabling regulatory adherence with user privacy.
Chainscore © 2026
overview
CORE SERVICE
Smart Contract Development
Secure, production-ready smart contracts built for scale and compliance.
- End-to-End Development: Full lifecycle from specification and
Solidity/Rustcoding to testing, deployment, and maintenance. - Security Audits & Best Practices: Proactive vulnerability identification and adherence to
ERC-20,ERC-721, and other key standards. - Gas Optimization: Code engineered for minimum transaction costs and maximum efficiency on EVM and non-EVM chains.
- Compliance Ready: Built-in patterns for regulatory requirements, including whitelisting and pausable functions.
key-features-cards
ENTERPRISE-GRADE STARKNET SOLUTIONS
Core Capabilities of Our ZK-Reputation Contracts
Our Cairo-based ZK-Reputation contracts deliver verifiable, private, and composable identity primitives for DeFi, gaming, and governance. We build systems that are secure by design and ready for production.
01
Customizable Reputation Logic
We develop bespoke reputation algorithms in Cairo, tailored to your protocol's needs—from on-chain credit scoring and governance weight to gated access and loyalty tiers. Your business logic, secured by zero-knowledge proofs.
2-4 weeks
Custom Logic Build
Cairo 1.0+
Language Standard
02
Privacy-Preserving Verification
Users prove their reputation score or credentials without revealing underlying data. Our contracts leverage STARK proofs to enable private participation in DeFi pools, DAO voting, and exclusive NFT mints.
ZK-STARKs
Proof System
< 1 sec
Proof Verification
03
Gas-Optimized & Scalable Architecture
Engineered for StarkNet's L2 efficiency. We implement storage optimizations and batchable operations to minimize transaction costs, enabling high-frequency reputation updates for millions of users.
Up to 90%
Gas Reduction
10k+ TPS
Theoretical Scale
04
Full Audit & Security Hardening
Every contract undergoes rigorous internal review and formal verification. We deliver audit-ready code with comprehensive test suites, following OpenZeppelin standards and StarkNet security best practices.
100%
Test Coverage
Formal Verification
Critical Paths
05
Seamless Protocol Integration
Designed for composability. Our contracts feature standard interfaces (like ERC-20/721 for soulbound tokens) and event hooks for easy integration with your existing DeFi, gaming, or social dApp stack.
ERC-20/721/1155
Standards Support
< 1 week
Integration Sprint
06
Ongoing Maintenance & Upgrades
We provide post-deployment support, including monitoring, performance tuning, and implementing upgradeable contract patterns (using Proxies) to ensure your reputation system evolves with your protocol.
99.9%
Uptime SLA
24/7
Dev Support
benefits
DELIVERABLES & GUARANTEES
Business Outcomes: Mitigate Risk and Accelerate Growth
Our StarkNet Cairo ZK-Reputation Contracts are engineered to deliver measurable security and speed advantages, directly translating to lower operational risk and faster time-to-market for your application.
01
Formally Verified Core Logic
We deliver ZK-Reputation contracts with formal verification of critical state transitions and access control, eliminating entire classes of smart contract vulnerabilities before deployment.
0
Critical Bugs Post-Audit
Certified
Verification by Certora
02
Gas-Optimized Cairo 1.0 Architecture
Our contracts are built on Cairo 1.0 with custom storage models and batched operations, reducing your users' transaction costs by up to 40% compared to unoptimized implementations.
~40%
Avg. Gas Reduction
Cairo 1.0
Latest Protocol
03
Modular Reputation Primitives
Get a library of pre-audited, composable modules for scoring, sybil resistance, and attestation. Integrate and customize in days, not months, to launch your MVP faster.
< 2 weeks
Integration Time
10+
Pre-built Modules
04
End-to-End Security Posture
Beyond the contract code, we provide a security architecture covering frontend integration, oracle data feeds, and key management, ensuring a holistic defense for your reputation system.
Full Stack
Security Review
SLA
Incident Response
05
Production-Ready Deployment
We handle the full deployment lifecycle on StarkNet Mainnet—including contract verification, indexer setup, and monitoring dashboards—so your team can focus on product growth.
99.5%
Uptime SLA
Live in 3 Weeks
Typical Timeline
06
Ongoing Protocol Upgrades
Maintain long-term system integrity with our managed upgrade service. We ensure your reputation contracts remain compatible with StarkNet core upgrades and new cryptographic primitives.
48h
Upgrade Testing Window
Guaranteed
Backwards Compatibility
From MVP to Enterprise-Grade
Structured Development Path for ZK-Reputation Systems
A phased approach to building and scaling privacy-preserving reputation systems on StarkNet, balancing speed, security, and long-term operational needs.
| Development Phase | Proof-of-Concept | Production-Ready | Enterprise Scale |
|---|---|---|---|
Core ZK-Reputation Circuit | |||
Cairo Smart Contracts (ERC-20/721 Rep) | |||
On-Chain Verifier Contract | |||
StarkNet Mainnet Deployment | |||
Comprehensive Security Audit | |||
Gas Optimization & Cost Analysis | Basic | Advanced | Continuous |
Integration Support (API/SDK) | Limited | Full | Custom |
System Monitoring & Alerting | Self-Hosted | Managed Dashboard | 24/7 SLA & PagerDuty |
Ongoing Maintenance & Upgrades | Ad-hoc | Quarterly Updates | Dedicated Engineer |
Estimated Timeline | 2-4 weeks | 6-10 weeks | 12+ weeks |
Typical Investment | $15K - $30K | $50K - $120K | Custom Quote |
how-we-deliver
PROVEN METHODOLOGY
Our Development and Audit Process
A rigorous, multi-phase approach designed to deliver secure, high-performance StarkNet reputation systems with predictable timelines and zero audit findings.
01
Architecture & Specification
We begin with a deep technical design session to define your reputation logic, data models, and Cairo 1.0 contract architecture. This phase ensures alignment on core mechanics like scoring algorithms, Sybil resistance, and upgrade paths.
1-2 weeks
Design Phase
100%
Requirement Sign-off
02
Cairo 1.0 Development
Our certified Cairo developers build your contracts using proven StarkNet patterns. We implement with a focus on gas efficiency, composability, and adherence to OpenZeppelin's Cairo libraries for security foundations.
4-6 weeks
Avg. Build Time
40-60%
Gas Savings Target
03
Internal Security Review
Before external audit, our senior auditors conduct a full code review. We run static analysis, fuzz tests, and manual inspection against a checklist of 50+ StarkNet-specific vulnerabilities, including storage layout risks and L1-L2 interaction flaws.
Zero Critical
Findings Goal
2+ Auditors
Peer Review
05
Testnet Deployment & Integration
We deploy to StarkNet testnet (Goerli/SEPOLIA) and assist with frontend/backend integration. We provide comprehensive testing scripts and documentation for your team to validate all reputation flows end-to-end.
< 3 days
Deployment Time
Full Suite
Integration Tests
06
Mainnet Launch & Monitoring
We oversee the mainnet deployment and establish monitoring dashboards for key metrics: contract calls, reputation score distributions, and error rates. Includes 30 days of post-launch support.
99.9%
Uptime SLA
30 days
Launch Support
Technical & Commercial Insights
Frequently Asked Questions on ZK-Reputation Contracts
Get clear, specific answers to the most common questions from CTOs and product leads evaluating StarkNet Cairo ZK-Reputation development.
For a standard ZK-Reputation system with core features (e.g., attestation, scoring, privacy-preserving verification), we deliver in 3-5 weeks from kickoff to mainnet. This includes design, Cairo development, testing, and audit preparation. Pricing is project-based, with standard deployments typically ranging from $25,000 to $75,000, depending on the complexity of the reputation model, number of integrated data sources, and custom zero-knowledge circuit requirements.
ENQUIRY
Get In Touch
today.
Our experts will offer a free quote and a 30min call to discuss your project.
NDA Protected
Confidentiality24h Response
Time to ValueDirectly to Engineering Team
No Sales Fluff10+
Protocols Shipped
$20M+
TVL Overall