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ZK-Port Inter-Chain Hub

ZK-Port is a unified, privacy-preserving asset management and cross-chain transfer hub designed to connect multiple blockchain ecosystems, including Ethereum, Solana, Cosmos, Avalanche, Polygon and Polkadot (and more). This project leverages the power of Rust, zero-knowledge proofs (ZKPs), and cross-chain interoperability standards (like IBC and XCMP) to create a scalable and trust-minimized multichain platform.

Vision

ZK-Port aims to solve the fragmented multichain experience by:

  • Aggregating fungible token balances from multiple chains in one seamless interface.
  • Enabling private and secure cross-chain transfers with ZKPs, ensuring user balances or eligibility are proven without being fully revealed.
  • Supporting multiple blockchain paradigms, including EVM-compatible chains, Substrate-based chains, and Solana.
  • Showcasing the potential of Rust as the core programming language for multichain applications.

Key Features

🔵 Unified Asset Dashboard

  • Aggregate and display fungible token balances across Ethereum, Solana, Cosmos, Avalanche, Polygon, and Polkadot.
  • Provide real-time updates and portfolio valuation.
  • Support wallet integrations for each chain (e.g., Metamask for EVM chains, Phantom for Solana, Keplr for Cosmos, and Polkadot.js for Polkadot).

🔵 ZK-Enabled Privacy

  • Prove ownership of tokens across chains without revealing exact balances using ZKPs.
  • Generate proofs for eligibility or threshold balances (e.g., “User owns at least 100 SOL”).

🔵 Cross-Chain Transfers

  • Enable fungible token transfers between chains using:
    • Bridges for EVM and Solana.
    • IBC for Cosmos.
    • XCMP/XCM for Polkadot.
  • Handle bridging complexity seamlessly through backend services.

🔵 Built for Developers

  • Entire stack built in Rust, showcasing a professional-grade, modular, and scalable architecture.
  • Designed to be extensible: adding new chains or proof types involves minimal effort.

Architecture

Overview Diagram

[Wallets/Front-End]
       |
[Backend (Rust)]
       |
       +--> Solana (Rust)
       |
       +--> Ethereum/Avalanche/Polygon (EVM)
       |
       +--> Cosmos (IBC)
       |
       +--> Polkadot (XCMP)

Backend (Rust)

The backend is implemented entirely in Rust, designed to handle data aggregation, cryptographic computations, and cross-chain communication efficiently and securely.

Responsibilities

  • Fetching token balances from multiple blockchain ecosystems.
  • Aggregating and storing cross-chain token data in a secure database.
  • Generating zero-knowledge proofs to validate user requests without revealing sensitive data.
  • Managing communication and transactions for cross-chain interoperability, including bridging and message relaying.

Core Technologies

  • API Frameworks: Axum for building REST APIs, providing high performance and async support.
  • Database: PostgreSQL or SQLite for storing user sessions, token balances, and cached blockchain states.
  • Cryptographic Libraries: Arkworks and Halo2 for designing and verifying zero-knowledge proof circuits.
  • Blockchain Interaction Crates:
    • solana-client: For querying Solana RPC nodes and submitting transactions.
    • ethers-rs: For interacting with EVM-compatible chains like Ethereum, Avalanche, and Polygon.
    • cosmrs: For querying Cosmos chains and creating IBC messages.
    • substrate-api-client: For interacting with Polkadot and its parachains.
  • Bridging Protocols: Wormhole, LayerZero, and Axelar for cross-chain transfers and messaging.
  • Logging: tracing for structured logging and Prometheus-compatible libraries for metrics collection.
  • Asynchronous Runtime: Tokio for handling concurrency across blockchain networks.

Zero-Knowledge Proofs

Zero-knowledge proofs are foundational to the privacy-preserving features of ZK-Port.

Key Concepts

  • Privacy-First Validation: Ensuring that sensitive information, such as exact token balances, is not exposed during proof generation.
  • Circuit Design: Leveraging Rust-based libraries to construct modular, efficient ZK circuits capable of threshold and aggregation proofs.
  • Efficiency Focus: Optimized circuit design minimizes computation and on-chain verification costs while maintaining scalability.

ZK Flow

  1. Request Initialization: A user submits a transfer or validation request.
  2. Data Fetching: The backend securely queries balances or state information from the relevant blockchains.
  3. Proof Generation: A ZK proof is generated using cryptographic libraries, validating the requested condition (e.g., balance threshold).
  4. Verification: The proof is either verified on-chain or relayed to the target chain for further action.

Cross-Chain Integrations

Ethereum/Avalanche/Polygon (EVM-Compatible)

Ethereum, Polygon and Avalanche are integrated as EVM-compatible chains, leveraging existing token standards and bridging solutions. Token balances are aggregated using secure RPC endpoints.

Solana

Solana’s high-throughput ecosystem is connected via custom Rust-based programs, enabling efficient bridging and state validation.

Cosmos

Cosmos inter-chain communication is facilitated using IBC protocols, relaying token information and enabling secure transfers between chains.

Polkadot

Polkadot’s Substrate-based chains are integrated through XCMP/XCM, with future support planned for trust-minimized light client verification.

Roadmap

Backend (Rust)

  • Implement wallet connection logic for
    • Solana
    • Ethereum
    • Avalanche
    • Polygon
    • Cosmos
    • Polkadot
  • Aggregate token balances across chains.
  • Design and optimize ZK circuits for threshold proofs.
  • Integrate bridging solutions for EVM and Solana.
  • Add IBC message relaying for Cosmos.
  • Simulate or implement XCMP calls for Polkadot.

On-Chain Programs

  • Solana program for ZK proof verification.
  • Minimal on-chain contract for IBC message verification.
  • Polkadot XCMP module for token transfers.

Frontend

  • Integrate wallet connections for supported chains.
  • Display token balances and portfolio valuation.
  • Implement cross-chain transfer UI.
  • Visualize ZK proof generation and verification.