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<h1 id="technical-overview"><a class="header" href="#technical-overview">Technical Overview</a></h1>
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<p>This document provides a high-level overview of the architecture, core technologies, and guiding principles for developers looking to build <strong><code>Dao Implements</code></strong>—applications and services that integrate with the Dao OS ecosystem.</p>
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<h2 id="guiding-technical-principles"><a class="header" href="#guiding-technical-principles">Guiding Technical Principles</a></h2>
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<ul>
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<li><strong>Library, not Framework</strong>: Dao OS is not a restrictive framework. The <strong><code>Meta Unit</code></strong> is a portable library that you integrate into your own application, empowering it with new capabilities without dictating its internal architecture.</li>
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<li><strong>Openness & Polyglotism</strong>: Any application, written in any language, can become an <strong><code>Avatar</code></strong> (a runtime for the <code>Meta Unit</code>). We achieve this by providing the <code>Meta Unit</code> as both a <strong>WASM</strong> library for web/scripting languages and as a <strong>native library</strong> (<code>.so</code>, <code>.dll</code>, <code>.a</code>) for system languages.</li>
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<li><strong>API-First</strong>: All interactions with the <code>Meta Unit</code> are conducted through a stable, versioned, and well-documented API.</li>
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<li><strong>Security-First</strong>: The <code>Meta Unit</code> is a secure vault. All data is end-to-end encrypted, and all interactions are governed by a strict, user-controlled permission system.</li>
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</ul>
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<h2 id="the-core-integration-how-an-app-becomes-an-avatar"><a class="header" href="#the-core-integration-how-an-app-becomes-an-avatar">The Core Integration: How an App Becomes an <code>Avatar</code></a></h2>
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<p>The journey of creating a <code>Dao Implement</code> begins by integrating the <code>Meta Unit</code> library, which instantly transforms the running application process into a sovereign <code>Avatar</code> in the user's Dao network. We provide two primary integration paths.</p>
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<h3 id="1-web-integration-path-via-daojs-sdk"><a class="header" href="#1-web-integration-path-via-daojs-sdk">1. Web Integration Path (via <code>dao.js</code> SDK)</a></h3>
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<p>This is the easiest and most accessible path for web developers.</p>
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<ul>
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<li><strong>How it works</strong>: A developer can take any new or existing web application. By including our <code>dao.js</code> SDK, their web app gains the ability to load the <code>Meta Unit</code>'s WASM binary (<code>dao.wasm</code>).</li>
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<li><strong>The Transformation</strong>: Once the user grants permission, the browser tab running the web app becomes a temporary <strong><code>Avatar</code></strong>. The web app's JavaScript can then communicate with the <code>Meta Unit</code> via the high-level API exposed by the <code>dao.js</code> bridge.</li>
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<li><strong>Best for</strong>: Building <code>Facet Implements</code> (<code>器</code>) quickly, creating data visualization dashboards, and integrating existing PWAs (Progressive Web Apps) into the Dao ecosystem.</li>
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</ul>
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<h3 id="2-native-integration-path-via-ffi"><a class="header" href="#2-native-integration-path-via-ffi">2. Native Integration Path (via FFI)</a></h3>
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<p>This path offers maximum performance and deep system integration for native applications.</p>
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<ul>
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<li><strong>How it works</strong>: A developer of a native application (written in Rust, Go, Swift, Kotlin, C++, etc.) can link against the <code>Meta Unit</code>'s native library.</li>
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<li><strong>The Transformation</strong>: The running native application process becomes a persistent <strong><code>Avatar</code></strong>. The application's code communicates with the <code>Meta Unit</code>'s services via a Foreign Function Interface (FFI) bridge.</li>
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<li><strong>Best for</strong>:
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<ul>
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<li>Creating powerful, always-on <strong><code>Core Implements</code> (<code>核</code>)</strong> on servers or NAS devices.</li>
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<li>Building high-performance, native <strong><code>Facet Implements</code> (<code>器</code>)</strong> like our ideal Flutter-based mobile clients.</li>
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<li>Adapting existing open-source native applications.</li>
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</ul>
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</li>
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</ul>
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<h2 id="key-technologies--protocols"><a class="header" href="#key-technologies--protocols">Key Technologies & Protocols</a></h2>
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<div class="table-wrapper"><table><thead><tr><th style="text-align: left">Category</th><th style="text-align: left">Technology / Protocol</th><th style="text-align: left">Purpose</th></tr></thead><tbody>
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<tr><td style="text-align: left"><strong>Core Library</strong></td><td style="text-align: left">Rust -> WASM / Native Libs</td><td style="text-align: left">To create a single, safe, and performant core logic for the <code>Meta Unit</code>.</td></tr>
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<tr><td style="text-align: left"><strong>Web Integration</strong></td><td style="text-align: left"><code>dao.js</code> SDK (JavaScript/TypeScript)</td><td style="text-align: left">The bridge for any web application to become an <code>Avatar</code>.</td></tr>
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<tr><td style="text-align: left"><strong>P2P Networking</strong></td><td style="text-align: left"><code>libp2p</code></td><td style="text-align: left">Modular peer discovery, transport, and secure channels.</td></tr>
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<tr><td style="text-align: left"><strong>Data Synchronization</strong></td><td style="text-align: left">CRDTs (Conflict-Free Replicated Data Types)</td><td style="text-align: left">Ensuring eventual consistency across Avatars.</td></tr>
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<tr><td style="text-align: left"><strong>Identity</strong></td><td style="text-align: left">DID & VC</td><td style="text-align: left">Sovereign identity and interoperable, cryptographic trust.</td></tr>
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<tr><td style="text-align: left"><strong>Data Serialization</strong></td><td style="text-align: left">Protocol Buffers (Protobuf)</td><td style="text-align: left">Efficient, language-agnostic data structures for APIs.</td></tr>
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