HashCloak Inc.

HashCloak Inc. is a specialized R&D lab and consultancy that builds full-stack privacy into blockchain products, founded in 2019 and based in Toronto, Canada. The company focuses on advanced cryptography, security auditing, and privacy infrastructure for blockchain projects.

Core Services

HashCloak offers three primary service offerings:

Security Auditing

Comprehensive security reviews for cryptographic protocols, smart contracts, and blockchain infrastructure. HashCloak has completed high-profile audits for major blockchain projects including the Ethereum Foundation's MACI and Wagyu implementations, Firo's Lelantus Spark privacy protocol, and Light Protocol's zero-knowledge systems.

Bespoke R&D

Custom research and implementation of cutting-edge cryptographic solutions tailored to specific blockchain project needs. Recent work includes implementing Semaphore in Noir (delivering full circuit implementation, SDK, and verifiers), building publicly verifiable private collaborative ML model training systems, and integrating cryptographic opcodes into Fuel VM.

Concierge Advisory

Direct access to HashCloak's team of cryptographers and researchers for ongoing support and consultation on complex privacy and cryptography challenges.

Key Strengths

HashCloak distinguishes itself as "builders first" - the team doesn't just consult, they actively develop their own products and research initiatives. Their most notable achievement is StoffelMPC, an MPC framework for building secure multi-party computation extensions for smart contracts, which successfully spun out as an independent company (Stoffel Labs). The company also maintains open-source projects including Meson (a mixnet for cryptocurrency transactions), Bonfire Wallet (WebAuthn-based wallet using RISC Zero), and Starkacy (cryptographic primitives optimized for Cairo/Starknet).

The team includes specialists in cryptography, blockchain security, and privacy technologies, with proven expertise in zero-knowledge proofs, multi-party computation, privacy-preserving machine learning, and cryptographic protocol design. Their privacy-first approach is embedded in every aspect of their work, including end-to-end encrypted communication and secure collaboration processes.

Notable Clients & Projects

HashCloak has established a strong track record with leading blockchain protocols:

• Ethereum Foundation: Security audits for MACI and Wagyu implementations
• Fuel Labs: Comprehensive cryptographic R&D and infrastructure development, including custom ZK circuit implementation in Sway language
• Firo: Audit and security services for the Lelantus Spark privacy protocol
• Light Protocol: Zero-knowledge proof audits and implementation work
• Aztec Network: Collaborative work on ZK-TLS verification in Noir

Client testimonials highlight HashCloak as a "premium team" (Zac Williamson, Aztec Network) that has been "instrumental for building blockchain infrastructure" and covers "every crypto vertical from auditing to writing custom zk circuits" (Nick Dodson, Fuel Labs).

Why Choose HashCloak

HashCloak offers a unique combination of deep cryptographic expertise, hands-on building experience, and comprehensive service offerings. Their builder-first mentality means they understand developers' challenges from practical experience, not just theory. With fast turnaround times, proven track record with major protocols, and unwavering focus on privacy technologies, HashCloak serves as a trusted partner for blockchain projects requiring advanced cryptographic solutions and security assurance.