EchoPost

EchoPost is a privacy-first, multi-platform publishing platform built for the Midnight ecosystem. It enables creators, developers, researchers, and organizations to publish content across multiple platforms from a single interface while keeping credentials private through Midnight's privacy-preserving technologies.

Instead of repeatedly authenticating with every platform, users securely connect their accounts once. OAuth credentials are encrypted locally and protected using Midnight's privacy architecture, allowing one-click publishing without exposing or permanently storing sensitive credentials.

Key Features

• 🔒 Privacy-First Authentication – OAuth credentials are encrypted and never publicly exposed.
• ⚡ One-Click Publishing – Publish simultaneously to multiple supported platforms.
• 🌐 Multi-Platform Support – Medium, Devpost, X, LinkedIn, Notion, GitHub, Hashnode, and additional platforms.
• 🛡️ Selective Disclosure – Share only the information required for authorization while protecting sensitive account data.
• 📜 Verifiable Publishing – Generate cryptographically verifiable audit records without revealing private credentials.
• 🚀 Built for Midnight – Leverages Midnight's privacy-enhancing infrastructure to protect users throughout the publishing workflow.

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Midnight Blockchain Integration

EchoPost extends traditional OAuth authentication with Midnight's zero-knowledge capabilities, enabling users to prove authorization without revealing the underlying credentials.

Smart Contracts

Compact smart contracts provide:

• Credential authorization verification
• Immutable publishing audit trails
• Privacy-preserving permission management
• Future support for decentralized identity integration

Zero-Knowledge Circuits

Noir ZK circuits enable:

• Proof of valid authorization without revealing OAuth tokens
• Private credential verification
• Selective disclosure of publishing permissions
• Cryptographic integrity for publishing workflows

Wallet Integration

EchoPost integrates with the Midnight Wallet SDK for:

• Testnet deployment
• Transaction signing
• Contract interaction
• Identity verification
• Secure blockchain communication

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Why EchoPost?

Traditional publishing platforms require users to repeatedly trust centralized services with long-lived API keys and OAuth tokens.

EchoPost takes a different approach by combining encrypted credential management with Midnight's privacy-preserving blockchain infrastructure. Users retain control over their credentials while benefiting from verifiable publishing, selective disclosure, and zero-knowledge authentication.

This creates a publishing experience that is:

• Private by default
• Cryptographically verifiable
• User-controlled
• Ready for decentralized identity
• Built for the next generation of Web3 applications

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Blockchain Setup

Follow the steps below to configure your Midnight development environment before deploying EchoPost's Compact contracts and Noir circuits.

EchoPost is a privacy-first publishing platform powered by Midnight. Users connect their social and content accounts once, OAuth credentials are encrypted, and a single click publishes to Medium, Devpost, X, LinkedIn, Notion, and other platforms without ever exposing or permanently storing sensitive credentials.

Blockchain Integration

EchoPost now includes Midnight blockchain integration with:

• Smart Contracts: Compact smart contracts for credential verification and audit trails
• ZK Circuits: Noir zero-knowledge circuits for privacy-preserving credential proofs
• Wallet Integration: Midnight wallet SDK for testnet deployment and transaction management

Blockchain Setup

For detailed setup instructions, see BLOCKCHAIN_SETUP.md

Quick start:

# Generate wallet
cd wallet && npm install && npm run generate

# Fund wallet (visit faucet URL)
npm run fund

# Compile ZK circuits
cd ../circuits && npm install && nargo build

# Deploy smart contract
cd ../contract && npm install && npm run deploy

Contract Address

Status: Simulation Deployed | Live Network: RPC Connection Issues

The EchoPost smart contract has been successfully deployed in simulation mode. Live network deployment to Midnight Preprod is currently blocked by RPC connectivity issues.

Simulation Deployment

• Network: Midnight Testnet (Simulation)
• Contract Address: contract_0088efb3c23c29d949f98b22229996875af2df1e
• Transaction Hash: 1a0eb8f9957dc99039044dae052860f5bc1fb192a8d4b5d83032059deb1dec27
• Deployer: midnight_test_bfd4b0a3dca91ecce64b30d55e0bd871c9407e01

Live Network Status

• Target Network: Midnight Preprod
• Wallet Address: mn_addr_preprod12w07jcw9k2k30m03t8u3gu9j2gr66r06rfx3p56ncpctrtmsr3qqhtfsjl
• RPC Endpoint: wss://rpc.preprod.midnight.network
• Status: RPC connection refused - network connectivity issue

Next Steps for Live Deployment:

1. Verify Midnight Preprod RPC endpoint availability
2. Check network connectivity and firewall settings
3. Ensure proof server is running on port 6300
4. Retry deployment once connectivity is restored

For deployment progress and wallet information, see COMPLETION_STATUS.md

Deployment

• Local development and production deployment guide: DOCKER_DEPLOYMENT.md
• One-click Railway deploy: connect your GitHub repo at railway.app and use the provided railway.json.

Architecture

• Frontend: React/Next.js with TypeScript
• Backend: Node.js/Express relay server
• Blockchain: Midnight smart contracts with ZK proofs
• Security: AES-256 credential encryption with ZK verification