Essi Studio - Verifiable Credentials Platform

A comprehensive platform for issuing, managing, and verifying digital credentials built on open standards.

Features

Credential Management

• Visual Credential Designer - Drag-and-drop interface for designing credential cards with custom branding, images, and layouts
• Schema Management - Create and manage credential schemas with support for multiple DID methods (cheqd, did:web, did:key)
• Credential Definitions - Define credential types with OCA (Overlay Capture Architecture) branding overlays

Issuance & Verification

• OID4VCI - OpenID for Verifiable Credential Issuance support
• OID4VP - OpenID for Verifiable Presentations for credential verification
• DIDComm Connections - Peer-to-peer secure messaging and credential exchange
• mDL/mdoc Support - ISO 18013-5 mobile driver's license credentials

Additional Features

• OpenBadges 3.0 - Issue and verify OBv3 credentials (Credly-compatible)
• Workflow Engine - Configurable credential issuance workflows
• Group Messaging - Secure group communication with MLS protocol
• Digital Signing - Document signing with verifiable credentials
• Proof of Execution (POE) - Zero-knowledge proof verification

Architecture

├── frontend/          # Next.js 16 frontend application
├── backend/           # Express.js backend with Credo-ts agent
├── packages/          # Shared workflow SDK packages
│   ├── workflow-client/
│   ├── workflow-react/
│   ├── workflow-ui-core/
│   └── workflow-backend-express/
└── docker-compose.yml # Docker deployment configuration

Quick Start

Prerequisites

• Docker and Docker Compose
• Node.js 20+ (for local development)

Environment Setup

1. Copy the example environment file:

   cp .env.example .env

2. Configure required variables in .env:

   # Required
   POSTGRES_PASSWORD=your-secure-password
   JWT_SECRET=your-jwt-secret-min-32-chars
   MAIN_WALLET_KEY=your-wallet-key
   
   # Optional - for full features
   REDIS_URL=redis://localhost:6379

Running with Docker

# Start all services
docker-compose up -d

# Access the application
# Frontend: http://localhost:3000
# Backend API: http://localhost:3002

Local Development

# Install dependencies
yarn install

# Start backend
cd backend && yarn dev

# Start frontend (new terminal)
cd frontend && yarn dev

API Overview

Authentication

• POST /api/auth/register - Register new user
• POST /api/auth/login - User login

Connections

• GET /api/connections - List connections
• POST /api/connections/invitation - Create invitation
• POST /api/connections/receive-invitation - Accept invitation

Credentials

• GET /api/credentials - List credentials
• POST /api/credentials/issue - Issue credential

Schemas & Definitions

• GET /api/schemas - List schemas
• POST /api/schemas - Create schema
• GET /api/credential-definitions - List definitions
• POST /api/credential-definitions - Create definition

OID4VC

• POST /api/oid4vci/offers - Create credential offer
• POST /api/oid4vp/authorization-requests - Create verification request

OpenBadges

• POST /api/openbadges/credentials/issue - Issue badge
• POST /api/openbadges/credentials/verify - Verify badge

Credential Designer

The visual credential designer allows you to:

• Design credential card layouts with drag-and-drop
• Add text, images, and attribute placeholders
• Set background colors, gradients, and images
• Configure branding with logos and colors
• Export to OCA (Overlay Capture Architecture) format
• Generate thumbnail previews automatically

Technology Stack

• Frontend: Next.js 16, React 19, Tailwind CSS, Craft.js
• Backend: Express.js, Credo-ts (Aries Framework)
• Database: PostgreSQL with Askar wallet storage
• Cache: Redis (optional, for horizontal scaling)
• Protocols: DIDComm v2, OID4VC, OpenBadges 3.0

License

Copyright (c) 2024 Ajna Inc. All rights reserved.