We architect and deploy custom smart contracts that form the foundation of your Web3 product. Our development process is built on security-first principles and proven patterns, delivering contracts that are audit-ready and gas-optimized from day one.
LABS
Services
Privacy-Preserving Anonymous Subscription Models
We build custom subscription protocols using zkSNARKs, enabling private payments and exclusive access without revealing user identity or activity data. Deploy in 4-6 weeks.
Chainscore © 2026
overview
CORE SERVICE
Smart Contract Development
Secure, production-ready smart contracts built for scale and compliance.
- Comprehensive Development: Full lifecycle support from
Solidity/Rustcoding andHardhat/Foundrytesting to mainnet deployment. - Security & Audits: Built with
OpenZeppelinlibraries and internal review, with seamless integration for third-party audits. - Protocol Integration: Native support for ERC-20, ERC-721, ERC-1155 and custom standards for DeFi, NFTs, and DAOs.
We deliver contracts that execute as intended, protect user assets, and scale with your business—turning complex logic into trustless, automated systems.
Typical Deliverables: Production-ready contract suite, comprehensive test suite & deployment scripts, technical specification document, and post-launch support for upgrades and maintenance.
key-features-cards
ARCHITECTURE & SECURITY
Core Technical Capabilities
Our engineering team delivers production-ready, privacy-first subscription systems. We focus on auditable security, seamless integration, and predictable performance for your Web3 product.
05
Gas-Optimized On-Chain Verification
Engineered circuits and contract logic to keep on-chain verification costs under $0.50 per transaction at standard gas prices, ensuring your subscription model remains economically viable.
< $0.50
Avg. Verification Cost
06
End-to-End Security Audits
Every system undergoes rigorous review. Our delivery includes a full audit report from partners like Spearbit or Code4rena, covering circuit logic, contract vulnerabilities, and integration points.
Zero Critical
Post-Audit Status
benefits
DELIVERABLES & GUARANTEES
Business Outcomes for Your Platform
Our privacy-preserving subscription models deliver measurable business results, from enhanced user trust to predictable recurring revenue. We focus on outcomes, not just features.
01
Regulatory-Compliant Privacy
Deploy subscription logic with zero-knowledge proofs (zk-SNARKs) to verify payments without exposing user identities or transaction graphs. Meets GDPR and emerging Web3 data privacy standards.
ZK-Proofs
Privacy Standard
GDPR-ready
Compliance
02
Predictable Recurring Revenue
Automate subscription billing cycles on-chain with tamper-proof logic. Enable stable cash flow with automated renewals, prorated upgrades, and failed payment handling.
100%
On-Chain Logic
Auto-Renewal
Feature
03
Reduced User Friction & Churn
One-click anonymous sign-ups eliminate KYC barriers. Users subscribe with a wallet, not an email, reducing sign-up abandonment by up to 70% compared to traditional models.
1-Click
Sign-Up
0 KYC
Friction
04
Enhanced Platform Trust & Loyalty
Build user loyalty by guaranteeing data sovereignty. Anonymous models attract privacy-conscious users and communities, increasing long-term platform engagement and retention.
Data Sovereignty
User Guarantee
High-Retention
Audience
05
Gas-Optimized & Scalable Architecture
Smart contracts built with Solidity 0.8+ and OpenZeppelin, optimized for minimal gas costs per renewal transaction. Scales to thousands of concurrent subscriptions.
< $0.50
Avg. Renewal Cost
OpenZeppelin
Security Base
06
Faster Time-to-Market
Leverage our audited, modular subscription contract library. Go from concept to live mainnet deployment in under 3 weeks, not months.
< 3 weeks
To Mainnet
Pre-Audited
Modules
Compare Implementation Tiers
Structured Development Packages
Select the package that matches your project's scale and compliance requirements for privacy-preserving subscription models.
| Feature / Deliverable | Starter | Professional | Enterprise |
|---|---|---|---|
Zero-Knowledge Subscription Logic | |||
Custom Anonymous Payment Handler | Basic (ERC-20) | Advanced (Multi-Asset) | Custom (Any Token/NFT) |
On-Chain Compliance Module | Basic (Age/GEO) | Full (KYC/AML Proofs) | |
Smart Contract Audit & Report | 1 Protocol | 2 Protocols + Upgrade Path | Full Suite + Formal Verification |
Frontend SDK Integration | React Library | React + Mobile SDK | Full-Stack SDK & White-label UI |
Deployment & Mainnet Launch Support | Guidance | Hands-on Support | Managed Deployment & Go-Live |
Ongoing Monitoring & Alerting | 30 Days | 6 Months | 24/7 with 99.9% SLA |
Incident Response Time SLA | Best Effort | < 12 Business Hours | < 4 Hours |
Team Expertise | Lead Developer | Dev + Security Lead | Dedicated Pod (3-5 Engineers) |
Estimated Timeline | 4-6 Weeks | 8-12 Weeks | 12+ Weeks (Custom) |
Starting Price | $25,000 | $75,000 | Custom Quote |
how-we-deliver
PROVEN FRAMEWORK
Our Delivery Methodology
We deliver production-ready, privacy-first subscription systems using a structured, milestone-driven process that de-risks development and ensures on-time delivery.
01
Architecture & Zero-Knowledge Design
We architect your system using ZK-SNARKs (e.g., Circom) or ZK-STARKs, selecting the optimal proving system for your gas costs and privacy guarantees. This includes designing the anonymous credential flow and on-chain verification logic.
Circom / Noir
Circuit Framework
1-2 weeks
Design Phase
02
Smart Contract Development & Auditing
Development of core subscription manager contracts (ERC-20/ERC-721 payments) and ZK verifiers in Solidity/Vyper. All code follows OpenZeppelin standards and undergoes internal review before external audit.
OpenZeppelin
Security Standard
2 Audits
Minimum
03
Backend Prover Service & Integration
We build and deploy the off-chain prover service (Node.js/Python) that generates ZK proofs for anonymous actions. Includes API design for seamless integration with your existing user dashboard or application.
< 2 sec
Proof Generation
REST/GraphQL
API Delivery
04
End-to-End Testing & Deployment
Comprehensive testing suite including circuit tests, integration tests for the full proof flow, and mainnet fork simulations. We manage the deployment to your chosen chain (Ethereum, Polygon, Arbitrum) with verified contracts.
100% Coverage
Critical Paths
2-3 weeks
Avg. Deployment
security
CORE SERVICE
Smart Contract Development
Secure, production-ready smart contracts built by Web3 specialists.
We architect and deploy custom smart contracts that form the immutable backbone of your application. Our development process is built on security-first principles, utilizing OpenZeppelin libraries and comprehensive testing to mitigate risks before deployment.
- From Concept to Mainnet: We handle the full lifecycle—specification,
Solidity/Rustdevelopment, unit/integration testing, and gas optimization. - Protocol Expertise: ERC-20, ERC-721, ERC-1155, custom DeFi logic, multi-sig wallets, and DAO governance.
- Guaranteed Quality: Every contract undergoes peer review and receives a detailed security audit report.
Deploy with confidence. We deliver battle-tested contracts that execute exactly as intended, protecting your users and your project's reputation.
Privacy-Preserving Subscriptions
Frequently Asked Questions
Get clear answers on how we build anonymous, compliant subscription models for Web3 applications.
We implement a zero-knowledge proof (ZKP) architecture that separates identity verification from on-chain activity. Users complete KYC once with a trusted provider. The system then issues a privacy-preserving credential (like a Semaphore identity or zkSNARK proof) that allows them to subscribe and transact anonymously. The application sees only the valid credential, not the user's personal data, ensuring compliance without sacrificing privacy.
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