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<h1 class="menu-title">Tesseras User Guide</h1>
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<h1 id="introduction"><a class="header" href="#introduction">Introduction</a></h1>
<p>Tesseras is a peer-to-peer network for preserving human memories across millennia. Each person creates a <strong>tessera</strong> — a self-contained time capsule of memories (photos, audio, video, text) that survives independently of any software, company, or infrastructure.</p>
<h2 id="what-is-a-tessera"><a class="header" href="#what-is-a-tessera">What is a tessera?</a></h2>
<p>The word <em>tessera</em> comes from the small tiles used to make mosaics in the ancient world. In Tesseras, each tessera is a collection of memories packaged into a format designed to be understood even thousands of years from now, without any special software.</p>
<p>A tessera contains:</p>
<ul>
<li><strong>Memories</strong> — photos (JPEG), audio recordings (WAV), video (WebM), and text (plain UTF-8)</li>
<li><strong>Metadata</strong> — when and where each memory was created, who it involves, and what it means</li>
<li><strong>Identity</strong> — cryptographic signatures proving who created it</li>
<li><strong>Decoding instructions</strong> — plain-text explanations of every format used, so future humans can read the contents</li>
</ul>
<h2 id="core-philosophy"><a class="header" href="#core-philosophy">Core philosophy</a></h2>
<ul>
<li><strong>No company dependency</strong> — your memories are yours, stored locally and replicated across a peer-to-peer network</li>
<li><strong>No format lock-in</strong> — every tessera includes instructions for decoding its contents</li>
<li><strong>Availability over secrecy</strong> — public memories are not encrypted, because long-term accessibility matters more than hiding things</li>
<li><strong>Minimal encryption</strong> — only private and sealed content is encrypted; everything else is open</li>
<li><strong>Quantum-resistant</strong> — dual signatures (Ed25519 + ML-DSA) protect integrity even against future quantum computers</li>
</ul>
<h2 id="current-status-phase-4"><a class="header" href="#current-status-phase-4">Current status: Phase 4</a></h2>
<p>Tesseras has completed through <strong>Phase 4</strong> — encryption and sealed tesseras. The project now covers local tessera management, networking, replication, a mobile app, and cryptographic privacy.</p>
<p>What’s available today:</p>
<ul>
<li>Identity generation (Ed25519 keypair with proof-of-work)</li>
<li>Tessera creation from local files</li>
<li>Content-addressed storage (BLAKE3 hashing)</li>
<li>Integrity verification and self-contained export</li>
<li>Full node daemon with QUIC transport</li>
<li>Peer discovery via Kademlia DHT</li>
<li>Tessera pointer publishing and lookup across the network</li>
<li>Reed-Solomon erasure coding with automatic fragment repair</li>
<li>Flutter mobile app with embedded Rust P2P node</li>
<li><strong>Private tesseras</strong> — encrypted content only the owner can access</li>
<li><strong>Sealed tesseras</strong> — time-locked content that opens after a specific date</li>
<li><strong>Hybrid post-quantum encryption</strong> — X25519 + ML-KEM-768 key encapsulation</li>
<li><strong>AES-256-GCM</strong> content encryption with AAD binding</li>
</ul>
<h2 id="key-concepts"><a class="header" href="#key-concepts">Key concepts</a></h2>
<div class="table-wrapper">
<table>
<thead>
<tr><th>Concept</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td><strong>Tessera</strong></td><td>A self-contained time capsule of memories</td></tr>
<tr><td><strong>Memory</strong></td><td>A single item (photo, recording, video, or text) within a tessera</td></tr>
<tr><td><strong>Content hash</strong></td><td>A BLAKE3 hash that uniquely identifies a tessera by its contents</td></tr>
<tr><td><strong>Visibility</strong></td><td>Controls who can access a tessera: public, private, sealed, or circle</td></tr>
<tr><td><strong>Sealed tessera</strong></td><td>A time capsule that can only be opened after a specific date</td></tr>
<tr><td><strong>MANIFEST</strong></td><td>A plain-text index listing every file in the tessera with its checksum</td></tr>
<tr><td><strong>Memory type</strong></td><td>Categorizes a memory: moment, reflection, daily, relation, or object</td></tr>
<tr><td><strong>Node</strong></td><td>A device running the Tesseras daemon, participating in the P2P network</td></tr>
<tr><td><strong>DHT</strong></td><td>Distributed hash table — how nodes find tessera pointers without a central server</td></tr>
<tr><td><strong>Bootstrap</strong></td><td>The process of joining the network by contacting known seed nodes</td></tr>
</tbody>
</table>
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