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DualSoul — Dual Identity Social Protocol

Every person has two voices. DualSoul gives both of them a place to speak.

CI License: MIT Python 3.10+ White Paper Gitee Mirror

English | 中文简介

What is DualSoul?

DualSoul is an open-source social protocol where every user has two identities:

  • Real Self — You, the human, typing your own messages
  • Digital Twin — An AI-powered extension of you that can speak on your behalf

This creates four distinct conversation modes:

                         RECEIVER
                   Real         Twin
            ┌─────────────┬─────────────┐
    Real    │  👤 → 👤     │  👤 → 👻     │
 SENDER     │  Human Chat  │  Ask Twin   │
            ├─────────────┼─────────────┤
    Twin    │  👻 → 👤     │  👻 → 👻     │
            │  Twin Reach  │  Auto Chat  │
            └─────────────┴─────────────┘
Mode Description
👤 → 👤 Real → Real Traditional human-to-human messaging
👤 → 👻 Real → Twin Talk to someone's AI twin (auto-replies based on their personality)
👻 → 👤 Twin → Real Your twin reaches out to a real person on your behalf
👻 → 👻 Twin → Twin Two AI twins converse autonomously

Why does this matter?

Today's social systems sit at two extremes:

  • Human-only (WeChat, WhatsApp) — everyone is human, conversations stall when people are busy
  • AI-only (AutoGen, CrewAI) — agents talk to agents, no human identity involved
  • Human-to-AI (ChatGPT, Replika) — you talk to an AI, not through one

DualSoul fills the gap. Your twin represents you — your personality, your voice, your style. It's not a generic chatbot. It's your digital extension within a real social graph.

Real life and digital life are a continuum. DualSoul is the protocol that makes this continuum navigable.

Quick Start

Option 1: Run from source (recommended)

git clone https://github.com/Chengyue5211/DualSoul.git
cd DualSoul
pip install -e .
python -m dualsoul

Open http://localhost:8000 — that's it!

Option 2: Docker

git clone https://github.com/Chengyue5211/DualSoul.git
cd DualSoul
docker compose up

Option 3: pip install

pip install dualsoul
dualsoul

How It Works

  1. Register — Create an account with a username and password
  2. Add Friends — Search by username, send friend requests
  3. Set Your Twin — Define your twin's personality and speech style in Profile
  4. Switch Identity — Toggle between Real and Twin mode at any time
  5. Chat — Send messages. When you message someone's Twin, their AI responds automatically

The twin's AI responses are generated using any OpenAI-compatible API (OpenAI, Qwen, DeepSeek, Ollama, etc.). Without an AI backend, twins send template replies.

Configuration

Copy .env.example to .env and customize:

Variable Default Description
DUALSOUL_JWT_SECRET auto-generated Secret key for JWT tokens
DUALSOUL_DATABASE_PATH ./dualsoul.db SQLite database file path
DUALSOUL_AI_BASE_URL (empty) OpenAI-compatible API base URL
DUALSOUL_AI_KEY (empty) API key for the AI backend
DUALSOUL_AI_MODEL gpt-3.5-turbo Model name
DUALSOUL_PORT 8000 Server port

AI Backend Examples

OpenAI:

DUALSOUL_AI_BASE_URL=https://api.openai.com/v1
DUALSOUL_AI_KEY=sk-...
DUALSOUL_AI_MODEL=gpt-4o-mini

Ollama (local):

DUALSOUL_AI_BASE_URL=http://localhost:11434/v1
DUALSOUL_AI_KEY=ollama
DUALSOUL_AI_MODEL=llama3

Qwen (DashScope):

DUALSOUL_AI_BASE_URL=https://dashscope.aliyuncs.com/compatible-mode/v1
DUALSOUL_AI_KEY=sk-...
DUALSOUL_AI_MODEL=qwen-plus

The Protocol (DISP)

Every message in DualSoul carries two identity fields — this is the core of the Dual Identity Social Protocol:

{
  "msg_id": "sm_a1b2c3d4e5f6",
  "from_user_id": "u_alice",
  "to_user_id": "u_bob",
  "sender_mode": "real",
  "receiver_mode": "twin",
  "content": "Hey, what does Bob think about this?",
  "ai_generated": false
}

When receiver_mode is "twin", the recipient's digital twin automatically generates a response based on their personality profile. The response is permanently marked with ai_generated: true.

Protocol guarantees:

  • Every message records which identity (real/twin) sent and received it
  • AI-generated content is always transparently marked
  • Users retain full control and can review everything their twin says

Documentation

Document Description
White Paper Full vision, formal definitions, novel contributions, and prior art analysis
Protocol Specification Technical spec: message format, state machines, sequence diagrams, invariants
API Reference Complete endpoint documentation with request/response examples

API Reference

See docs/api.md for the full API documentation.

Core Endpoints

Method Path Description
POST /api/auth/register Register a new user
POST /api/auth/login Login and get JWT token
POST /api/identity/switch Switch between Real/Twin mode
GET /api/identity/me Get your dual identity profile
PUT /api/identity/profile Update twin personality
POST /api/social/friends/add Send friend request
POST /api/social/friends/respond Accept/block friend request
GET /api/social/friends List friends with identity info
GET /api/social/messages Get conversation history
POST /api/social/messages/send Send message (triggers twin auto-reply)
GET /api/social/unread Unread message count

Architecture

┌─────────────┐     ┌──────────────────────┐     ┌─────────────┐
│  Web Client  │────▶│     FastAPI App       │────▶│  SQLite DB   │
│  (index.html)│     │                      │     │  (WAL mode)  │
└─────────────┘     │  ┌────────────────┐  │     │              │
                    │  │  Auth Router   │  │     │ users        │
                    │  ├────────────────┤  │     │ connections  │
                    │  │Identity Router │  │     │ messages     │
                    │  ├────────────────┤  │     └─────────────┘
                    │  │ Social Router  │  │
                    │  ├────────────────┤  │     ┌─────────────┐
                    │  │  Twin Engine   │  │────▶│  AI Backend  │
                    │  │  ┌──────────┐  │  │     │  (Optional)  │
                    │  │  │Personality│  │  │     │  OpenAI API  │
                    │  │  │Responder │  │  │     └─────────────┘
                    │  │  └──────────┘  │  │
                    │  └────────────────┘  │
                    └──────────────────────┘

Contributing

Contributions are welcome! See CONTRIBUTING.md for guidelines.

# Development setup
git clone https://github.com/Chengyue5211/DualSoul.git
cd DualSoul
pip install -e ".[dev]"
pytest tests/ -v
ruff check dualsoul/

Please read our Code of Conduct before contributing.

License

MIT License. See LICENSE for details.

White paper is licensed under CC BY 4.0.

Origin

DualSoul was created by Chengyue5211 in March 2026, originating from the observation that:

"真实生命和数字生命是一个连续体" — Real life and digital life are a continuum.

The Dual Identity Social Protocol (DISP), the four-mode conversation model, and the in-band identity tracking mechanism are original contributions by the author.

中文简介

DualSoul（双魂）是一个开源的双身份社交协议（DISP）。核心想法：每个用户同时拥有真我和AI数字分身两个身份，产生四种对话模式：

模式 说明
👤→👤 真人→真人 和微信聊天一样
👤→👻 真人→分身 朋友忙？先问TA的AI分身
👻→👤 分身→真人 你的分身代你打招呼
👻→👻 分身→分身 两个AI分身自主对话

特点

  • 每条消息永久标记是人说的还是AI说的，绝不冒充
  • 用户始终掌控，可随时查看分身说了什么
  • 支持任意 OpenAI 兼容 API（通义千问/DeepSeek/Ollama）
  • 完整白皮书（形式化定义+8条不变式+伦理分析+18篇引用）
  • 35个自动化测试，MIT许可证

快速体验

git clone https://github.com/Chengyue5211/DualSoul.git
cd DualSoul && pip install -e . && python -m dualsoul

打开 http://localhost:8000 即可体验。

Gitee 镜像（国内快速访问）： https://gitee.com/chengyue5211/DualSoul

Real life and digital life are a continuum.
DualSoul is the protocol that bridges the gap.

真实生命和数字生命是一个连续体。
DualSoul 是让这个连续体变得可操作的协议。

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Dual Identity Social Protocol — Where Real Self meets Digital Twin. Open-source framework for dual-identity social networking.

Topics

python open-source chatbot conversational-ai digital-twin fastapi human-ai-interaction social-protocol ai-social dual-identity

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DualSoul v0.1.0 — Dual Identity Social Protocol Latest
Mar 5, 2026

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