We deliver audit-ready Solidity code for ERC-20, ERC-721, ERC-1155, and custom protocols. Our contracts are built with OpenZeppelin standards and include comprehensive unit and integration tests.
LABS
Services
Bitcoin-to-StarkNet ZK-Rollup Bridge Engineering
We engineer custom zero-knowledge proof-based bridges to port Bitcoin to StarkNet. Our solutions use validity proofs for trustless security, enabling your users to interact with BTC in complex smart contracts and DeFi applications on Ethereum's fastest L2.
Chainscore © 2026
overview
CORE SERVICE
Smart Contract Development
Secure, production-ready smart contracts built by Web3 experts to power your protocol.
- Security-First Development: Formal verification, gas optimization, and comprehensive vulnerability analysis.
- Full-Stack Integration: Contracts designed to work seamlessly with your frontend and backend.
- Deployment & Verification: We handle mainnet/testnet deployment and Etherscan/Snowtrace verification.
key-features-cards
END-TO-END BRIDGE ENGINEERING
Core Technical Capabilities We Deliver
We architect and deploy production-ready Bitcoin-to-StarkNet bridges, delivering secure, scalable, and cost-efficient interoperability for your DeFi and institutional applications.
01
Custom ZK-Rollup Bridge Architecture
We design and implement bespoke ZK-Rollup circuits and state transition logic to securely move Bitcoin assets onto StarkNet. Our architecture ensures cryptographic security and data availability without compromising on performance.
ZK-SNARK/STARK
Proof System
< 10 min
Finality Time
02
Secure Multi-Sig & MPC Custody
Deploy robust, audited custody solutions for the Bitcoin lock-up side. We implement threshold signatures (TSS) and multi-party computation (MPC) to eliminate single points of failure and protect billions in bridged assets.
n-of-m
Signer Scheme
SOC 2 Type II
Compliance
03
Cairo Smart Contract Development
Our team builds and audits the core StarkNet bridge contracts in Cairo 1.0. We specialize in gas-optimized logic for minting/burning wrapped assets, managing liquidity pools, and handling bridge governance.
Cairo 1.0
Language
OpenZeppelin
Standards
04
Relayer & Prover Infrastructure
We provide managed, high-availability infrastructure for bridge relayers and ZK provers. Our systems guarantee >99.9% uptime, automated failover, and real-time monitoring for seamless cross-chain operations.
>99.9%
Uptime SLA
< 2 sec
Relay Latency
05
Protocol Integration & SDKs
We ensure your bridge integrates seamlessly with leading DeFi protocols on StarkNet (e.g., JediSwap, zkLend) and provide developer SDKs for easy front-end and backend integration, accelerating your time-to-market.
TypeScript/Python
SDK Languages
< 4 weeks
Integration Time
06
Security Audits & Formal Verification
Every component—from Cairo contracts to Bitcoin scripts—undergoes rigorous review. We partner with top firms like Trail of Bits and Certora for audits and formal verification, delivering a security-first bridge.
Trail of Bits
Audit Partner
Formal Spec
Verification
benefits
ENGINEERED FOR SCALE
Business Outcomes for Your Project
Our Bitcoin-to-StarkNet ZK-Rollup bridge engineering delivers more than just code. We build production-grade infrastructure that drives measurable business results, from accelerated time-to-market to hardened security.
01
Accelerated Time-to-Market
Deploy a fully audited, production-ready Bitcoin bridge in under 6 weeks. Our battle-tested ZK-Rollup architecture and modular components eliminate months of R&D, allowing you to launch and capture market share faster.
< 6 weeks
To Production
0
Custom R&D Sprints
02
Enterprise-Grade Security & Audits
Bridge security is non-negotiable. We deliver contracts and circuits audited by leading firms like Trail of Bits and CertiK, with formal verification for critical state transitions, ensuring your users' assets are protected.
100%
Critical Issues Resolved
Tier-1
Audit Partners
03
Sub-Cent Transaction Costs
Leverage StarkNet's ZK-Rollup efficiency. We engineer bridges that settle Bitcoin transactions for fractions of a cent, enabling micro-transactions and new economic models impossible on L1.
< $0.01
Avg. Tx Cost
100x
Vs. L1 Settlement
04
Sub-Second Finality for Users
Replace Bitcoin's 10+ minute confirmation with near-instant user experience. Our bridge provides cryptographic proof of settlement in under 1 second, crucial for DeFi, gaming, and trading applications.
< 1 sec
Proof Finality
10 min → 1 sec
UX Improvement
05
Proven Interoperability Framework
Avoid integration dead-ends. We build with extensible standards (like IBC-inspired patterns) and pre-integrate with major StarkNet DeFi protocols (zkLend, Nostra) for immediate liquidity access.
5+
Pre-Integrated DApps
Modular
Architecture
06
Dedicated Protocol Expertise
Your team gains direct access to our engineers who have built on Bitcoin Script, StarkNet Cairo, and ZK circuits. We provide comprehensive documentation and handover, turning a complex system into a maintainable asset.
24/7
Expert Support
Full
Code & Doc Handoff
Structured Roadmap for Bridge Deployment
Phased Development & Deliverables
A transparent breakdown of our engineering process, deliverables, and support levels for your Bitcoin-to-StarkNet ZK-Rollup bridge.
| Phase & Deliverables | Foundation | Production | Enterprise Scale |
|---|---|---|---|
Phase 1: Architecture & Core Contracts | |||
Phase 2: ZK-Circuit & Prover Integration | |||
Phase 3: Bridge UI & SDK | Basic | Custom Branded | White-label + API |
Security Audit Scope | Internal Review | Single 3rd-Party Audit | Multi-firm Audit + Bug Bounty |
Deployment & Go-Live Support | Documentation | Hands-on Deployment | Managed Launch & SRE |
Post-Launch Monitoring | 30 Days | 6 Months SLA | 24/7 Dedicated SRE |
Mean Time to Resolution (MTTR) | N/A | < 24 Hours | < 4 Hours |
Custom Feature Development | N/A | Add-on Scope | Dedicated Engineering Pod |
Estimated Timeline | 8-10 Weeks | 12-16 Weeks | 16+ Weeks |
Starting Engagement | $80K | $180K | Custom Quote |
how-we-deliver
PRODUCTION-READY INFRASTRUCTURE
Our Engineering & Security Methodology
We build Bitcoin-to-StarkNet bridges with enterprise-grade security and performance, ensuring your cross-chain application is reliable from day one.
01
Formal Verification & Audits
All bridge logic and smart contracts undergo formal verification using Cairo and rigorous third-party audits from firms like Trail of Bits and CertiK. We deliver verifiably secure code.
0
Critical Bugs in Production
3+
Audit Partners
02
Zero-Knowledge Proof Architecture
We design custom ZK circuits for efficient Bitcoin state verification on StarkNet. Our architecture minimizes proof generation time and on-chain verification costs.
< 5 min
Proof Generation
~$0.10
Avg. Verification Cost
03
High-Availability Relayer Network
Deploy with our decentralized, fault-tolerant relayer network. Automated monitoring and failover ensure continuous operation and data availability.
99.95%
Historical Uptime SLA
< 30 sec
Failover Time
04
Battle-Tested Development Framework
Leverage our proprietary framework built from 10+ bridge deployments. Includes pre-built modules for fraud proofs, multi-sig governance, and economic security.
4-6 weeks
Reduced Time-to-Market
10+
Production Bridges
The Infrastructure Decision for Bitcoin-to-StarkNet
Build vs. Buy: Custom ZK Bridge vs. Generic Solutions
A technical and economic comparison of developing a custom ZK-Rollup bridge in-house versus partnering with Chainscore Labs for a production-ready solution.
| Key Factor | Build In-House | Generic Bridge SDK | Chainscore Custom Engineering |
|---|---|---|---|
Time to Production | 6-12+ months | 2-4 months | 4-8 weeks |
Initial Development Cost | $300K - $800K+ | $50K - $150K | $75K - $200K |
Security Posture | High Risk (custom, unaudited) | Medium Risk (shared codebase) | Low Risk (audited, battle-tested patterns) |
Bitcoin Integration Depth | Full control, high complexity | Limited to SDK's abstraction | Deep, protocol-level customization |
StarkNet Cairo Integration | Requires Cairo/StarkEx expertise | Pre-configured, limited flexibility | Optimized for Cairo 1.0 & account abstraction |
ZK Proof System Ownership | Build & maintain prover/verifier | Opaque, dependent on vendor | Custom or integrated (Plonky2, STARK) |
Ongoing Maintenance & Updates | Full team required (3-5 engineers) | Vendor-managed, limited control | Optional SLA with 24/7 monitoring |
Settlement Finality | Customizable (your risk) | Defined by vendor (often slower) | Sub-2 minutes with economic guarantees |
Total Cost of Ownership (Year 1) | $500K - $1.2M+ | $150K - $300K | $150K - $350K (incl. optional SLA) |
Recommended For | Protocols with massive scale & unique research | MVPs or apps with standard needs | Startups & enterprises needing secure, scalable production bridges |
Technical Deep Dive
Frequently Asked Questions on ZK Bridge Engineering
Get clear, specific answers about our Bitcoin-to-StarkNet ZK-Rollup bridge engineering process, timelines, security, and support.
A complete, production-ready ZK bridge from Bitcoin to StarkNet typically takes 6-10 weeks from kickoff to mainnet deployment. This includes 2 weeks for architecture design and ZK circuit specification, 3-4 weeks for core development and testing, and 1-2 weeks for security audits and final deployment. We deliver a working prototype for client review within the first 3 weeks.
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