Crypto Companies Directory

Zingolabs is an open-source software development organization that develops Zingo, a non-custodial wallet for Zcash. The wallet enables users to conduct privacy-preserving transactions using Zcash's shielded pools, which employ zero-knowledge proofs. Zingo incorporates a custom synchronization engine called pepper-sync that allows users to spend funds before completing a full blockchain synchronization, reducing latency on mobile and resource-constrained devices. The wallet architecture is designed to support future Zcash protocol features, including staking and Memo Bundles. Users maintain self-custody of their funds and private keys. Zingolabs maintains public code repositories and operates as an open-source project without a disclosed physical headquarters.

zkBob is a privacy-focused smart contract wallet that enables users to send and receive cryptocurrency transactions without exposing wallet contents, transaction amounts, or counterparties on-chain. It uses zero-knowledge proof technology to enable private peer-to-peer transfers, supporting USDC on Polygon, and ETH and USDC on Optimism, with USDT on Tron also indicated. The product targets individuals and organizations seeking transactional privacy for use cases such as payroll, donations, and general payments, while incorporating compliance features including daily limits, KYC options, and wallet screening. Developers can integrate zkBob functionality through an SDK and direct deposit contract, and Igor Barinov is noted as a founder of the project.

ZKcandy is an Ethereum Layer 2 blockchain constructed using ZKsync's Elastic Chain technology. The system is designed to support gaming and AI-driven entertainment applications. The architecture implements zero-knowledge proof mechanisms to enable low transaction fees and streamlined user onboarding. The platform includes a Telegram-based Game Center interface that provides mobile access and incorporates quest-and-reward mechanics for user engagement. The project is operated by iCandy Interactive, a Southeast Asian game studio, and has received support from Animoca Brands, Spartan, and Wemix. ZKcandy operates a mainnet with a native KRO token and maintains a token swap interface.

zkCloud is a cloud-based zero-knowledge proof generation service that allows developers and researchers to create ZK proofs without local hardware setup. The platform supports three proving protocols, Groth16, PLONK, and ZK-STARKs, enabling users to select the approach that best fits their proof size, speed, and trusted-setup requirements. Payments are accepted via Ethereum, zkSync, and the Lightning Network, and the service exposes an API secured by token authentication for programmatic integration. The platform targets blockchain developers and ZK newcomers alike, offering a circom-language playground, tutorials, and high-performance cloud servers described as roughly three times faster than consumer laptops. zkCloud is associated with the Intmax/InternetMaximalism project ecosystem, with a roadmap that includes ZK-Rollup infrastructure.

zkFold SA is a blockchain and cryptography consulting firm providing services in zero-knowledge proof systems, smart contract development, and cryptographic protocol design, with primary focus on the Cardano ecosystem. The firm delivers full-stack project services including ZK circuit design, cross-chain bridge architecture, privacy protocols, and Layer 2 scaling solutions. Current development includes a zero-knowledge rollup implementation for Cardano. The firm's technical foundation includes zkFold Symbolic, a Haskell-based library for constructing zero-knowledge circuits. Service offerings encompass consulting for DeFi protocols, cross-chain infrastructure projects, and grant-funded initiatives, including grant proposal co-authorship and milestone-based engineering delivery. The firm was founded by Vladimir Sinyakov, who holds a Ph.D. in mathematics.

ZKNOX is a cryptography and hardware security firm specializing in blockchain-integrated security solutions, with a strong focus on the Ethereum ecosystem. The company develops cryptographic libraries, ZK circuits, smart contracts, and hardware wallet integrations, covering the full security stack from user-facing secure enclaves to backend HSMs and TEEs. Its product lines include tools such as ZKNOX Blue and ZKNOX Orange, a post-quantum BIP39 demo, and on-chain ZK hardware proofs, alongside services covering security audits, cryptographic design, and implementation. ZKNOX targets blockchain developers, protocol teams, and organizations requiring production-grade cryptographic implementations, and contributes to the Ethereum ecosystem through EIP authorship, academic papers, and open-source libraries on GitHub.

Zogi Labs is a game development studio that creates blockchain-based games. Its primary title, Legends of Bezogia, is a cross-platform MMORPG that operates on blockchain infrastructure. The game incorporates NFT-based avatars called Bezogis, on-chain asset ownership mechanisms, and staking functionality. The platform is designed to serve both users with cryptocurrency experience and those without prior exposure to blockchain technology. The studio has partnerships with Cronos, Polygon, and ChainPlay. Additional products under development include an NFT marketplace and a cryptocurrency wallet. The studio applies production methodologies and technical standards to game development and visual design.

Zone21.com is a comparison and risk-assessment platform for Bitcoin-backed lending providers. The platform assigns numerical risk scores to centralized finance (CeFi) and decentralized finance (DeFi) lending platforms, with scores ranging from 29 (low risk) to 90 (critical risk). Risk assessments are based on custody models, rehypothecation practices, loan-to-value (LTV) ratios, and know-your-customer (KYC) requirements. The platform covers multiple lending providers and presents comparative data including interest rate ranges, liquidation thresholds, and accepted collateral types in structured tables. Users can customize comparisons between providers. The platform generates and publishes provider rankings.

Nockchain is a Layer 1 proof-of-work blockchain that integrates zero-knowledge proofs into its mining mechanism, referred to as zkPoW. The protocol combines traditional proof-of-work consensus with zero-knowledge verification. The computational foundation is built on Nock, a minimalist combinator calculus. The network launched without a pre-mine allocation. Developer tooling has been released, including NockApp and the Jock programming language to support application development. Zorp operates as a separate entity that holds the native NOCK asset, while the Nockchain protocol functions as an independent network.