ContentProof

ContentProof is a Next.js application for signing files with a Gmail‑verified Ed25519 signature. Users authenticate with Google, sign a file locally and receive a signature that can be verified independently of the original file.

The repository contains the web interface and serverless API routes that power the service. Additional design documents are available in the documentation directory.

Getting Started

Install dependencies and run the development server:

npm install
npm run dev

Open http://localhost:3000 in your browser to view the app.

Environment Variables

Create a .env.local file and provide the following values:

• GOOGLE_CLIENT_ID and GOOGLE_CLIENT_SECRET
• ED25519_PRIVATE_KEY and ED25519_PUBLIC_KEY
• Optional KV_REST_API_URL and KV_REST_API_TOKEN for rate limiting

Available Scripts

• npm run dev – start the development server
• npm run build – create a production build
• npm start – run the built app
• npm run lint – run ESLint

Deployment

The project is ready to deploy on Vercel. Run vercel --prod or build locally with npm run build followed by npm start.