c0gito

Videos

Description

Overview

c0gito is a privacy-preserving cross-chain transfer protocol that enables completely confidential cryptocurrency transfers between users. By leveraging Oasis Sapphire's confidential computing capabilities and Hyperlane's cross-chain messaging, c0gito ensures that transfer details (recipient, amount, memo) remain encrypted and private throughout the entire transaction lifecycle.

Problem Statement

Traditional blockchain transfers expose sensitive information on-chain:

• Recipient addresses are publicly visible

• Transfer amounts are transparent

• Transaction memos are readable by anyone

• Privacy concerns prevent adoption in sensitive use cases

c0gito Solution

• Encrypting transfer payloads using X25519DeoxysII encryption before on-chain submission

• Confidential processing on Oasis Sapphire, where decryption happens in a trusted execution environment

• Cross-chain architecture using Hyperlane to bridge between Mantle (public) and Sapphire (confidential)

• Real-time indexing with Ponder for transparent tracking without exposing private data

Key Components

1. PrivateTransferIngress (Mantle Sepolia)

   • Accepts deposits (Native MNT)

   • Escrows funds

   • Forwards encrypted payloads via Hyperlane

   • Releases funds upon receiving decrypted instructions

2. PrivateTransferVault (Oasis Sapphire)

   • Stores encrypted transfer payloads

   • Decrypts using Sapphire's confidential computing

   • Builds release instructions

   • Sends instructions back to Mantle via Hyperlane

3. Ponder Indexer

   • Indexes events from both chains

   • Tracks deposit and transfer status

   • Provides GraphQL API for frontend

4. c0gito Service

   • Monitors pending transfers

   • Automatically processes transfers on Sapphire

   • Handles acknowledgment flow

5. Frontend (Next.js)

   • User-friendly interface for deposits and transfers

   • Real-time status tracking

   • Privacy-focused UX

Contact Me

Evril Fadrekha Cahyani
Telegram : @piyonvls
Discord : @piyo
Email : magacalarth@gmail.com
Github : https://github.com/evrilfc

Progress During Hackathon

The MVP includes a full-stack implementation: Solidity smart contracts (PrivateTransferIngress and PrivateTransferVault) enabling private cross-chain transfers between Mantle Sepolia and Oasis Sapphire through Hyperlane's cross-chain messaging protocol, a Next.js 16.1.1 frontend with React and TypeScript featuring an intuitive deposit interface, private transfer initiation with recipient address and memo fields, real-time transaction status tracking, and recent transfers history display, client-side encryption using X25519DeoxysII from Oasis Sapphire's confidential computing library to encrypt transfer payloads (recipient, amount, memo) before on-chain submission, confidential decryption on Oasis Sapphire's Trusted Execution Environment (TEE) where the Vault contract securely processes encrypted data without exposing sensitive information to the public blockchain, a Ponder indexing layer providing a GraphQL API for real-time deposit and transfer status tracking across both chains, wallet integration with Wagmi and RainbowKit for seamless Web3 interactions, and a Node.js service layer that monitors pending transfers and automatically processes them on Sapphire. The platform addresses traditional blockchain privacy issues—public visibility of recipient addresses, transparent transfer amounts, and readable transaction memos—by implementing end-to-end encryption with client-side key generation, forwarding encrypted payloads via Hyperlane's cross-chain messaging to Oasis Sapphire for confidential decryption, and ensuring that only encrypted hashes are visible on the public Mantle blockchain while actual transfer details remain completely private. Currently deployed on Mantle Sepolia testnet and Oasis Sapphire testnet with comprehensive testing including 17 test cases covering deposits, transfers, mappings, and edge cases. The architecture demonstrates a scalable approach to privacy-preserving cryptocurrency transfers, combining smart contract automation with confidential computing capabilities to enable truly private cross-chain transactions in the Web3 ecosystem.

Tech Stack