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<h1 id="introdução"><a class="header" href="#introdução">Introdução</a></h1>
<p>Tesseras é uma rede peer-to-peer para preservar memórias humanas através dos milênios. Cada pessoa cria uma <strong>tessera</strong> — uma cápsula do tempo autocontida de memórias (fotos, áudio, vídeo, texto) que sobrevive independentemente de qualquer software, empresa ou infraestrutura.</p>
<h2 id="o-que-é-uma-tessera"><a class="header" href="#o-que-é-uma-tessera">O que é uma tessera?</a></h2>
<p>A palavra <em>tessera</em> vem das pequenas peças usadas para fazer mosaicos no mundo antigo. No Tesseras, cada tessera é uma coleção de memórias empacotada em um formato projetado para ser compreendido mesmo daqui a milhares de anos, sem nenhum software especial.</p>
<p>Uma tessera contém:</p>
<ul>
<li><strong>Memórias</strong> — fotos (JPEG), gravações de áudio (WAV), vídeo (WebM) e texto (UTF-8 puro)</li>
<li><strong>Metadados</strong> — quando e onde cada memória foi criada, quem está envolvido e o que significa</li>
<li><strong>Identidade</strong> — assinaturas criptográficas provando quem criou</li>
<li><strong>Instruções de decodificação</strong> — explicações em texto puro de cada formato utilizado, para que humanos do futuro possam ler o conteúdo</li>
</ul>
<h2 id="filosofia-central"><a class="header" href="#filosofia-central">Filosofia central</a></h2>
<ul>
<li><strong>Sem dependência de empresas</strong> — suas memórias são suas, armazenadas localmente e replicadas em uma rede peer-to-peer</li>
<li><strong>Sem aprisionamento de formato</strong> — cada tessera inclui instruções para decodificar seu conteúdo</li>
<li><strong>Disponibilidade acima de sigilo</strong> — memórias públicas não são criptografadas, porque acessibilidade a longo prazo importa mais do que esconder coisas</li>
<li><strong>Criptografia mínima</strong> — apenas conteúdo privado e selado é criptografado; todo o resto é aberto</li>
<li><strong>Resistente a computadores quânticos</strong> — assinaturas duplas (Ed25519 + ML-DSA) protegem a integridade mesmo contra futuros computadores quânticos</li>
</ul>
<h2 id="status-atual-fase-4"><a class="header" href="#status-atual-fase-4">Status atual: Fase 4</a></h2>
<p>Tesseras completou até a <strong>Fase 4</strong> — criptografia e tesseras seladas. O projeto agora cobre gerenciamento local de tesseras, rede, replicação, app mobile e privacidade criptográfica.</p>
<p>O que está disponível hoje:</p>
<ul>
<li>Geração de identidade (par de chaves Ed25519 com prova de trabalho)</li>
<li>Criação de tesseras a partir de arquivos locais</li>
<li>Armazenamento endereçado por conteúdo (hashing BLAKE3)</li>
<li>Verificação de integridade e exportação autocontida</li>
<li>Daemon de nó completo com transporte QUIC</li>
<li>Descoberta de pares via DHT Kademlia</li>
<li>Publicação e busca de ponteiros de tesseras pela rede</li>
<li>Codificação de apagamento Reed-Solomon com reparo automático de fragmentos</li>
<li>App mobile Flutter com nó Rust P2P embarcado</li>
<li><strong>Tesseras privadas</strong> — conteúdo criptografado que apenas o dono pode acessar</li>
<li><strong>Tesseras seladas</strong> — conteúdo com bloqueio temporal que abre após uma data específica</li>
<li><strong>Criptografia híbrida pós-quântica</strong> — encapsulamento de chaves X25519 + ML-KEM-768</li>
<li><strong>AES-256-GCM</strong> para criptografia de conteúdo com vinculação AAD</li>
</ul>
<h2 id="conceitos-chave"><a class="header" href="#conceitos-chave">Conceitos-chave</a></h2>
<div class="table-wrapper">
<table>
<thead>
<tr><th>Conceito</th><th>Descrição</th></tr>
</thead>
<tbody>
<tr><td><strong>Tessera</strong></td><td>Uma cápsula do tempo autocontida de memórias</td></tr>
<tr><td><strong>Memória</strong></td><td>Um item individual (foto, gravação, vídeo ou texto) dentro de uma tessera</td></tr>
<tr><td><strong>Hash de conteúdo</strong></td><td>Um hash BLAKE3 que identifica unicamente uma tessera pelo seu conteúdo</td></tr>
<tr><td><strong>Visibilidade</strong></td><td>Controla quem pode acessar uma tessera: pública, privada, selada ou círculo</td></tr>
<tr><td><strong>Tessera selada</strong></td><td>Uma cápsula do tempo que só pode ser aberta após uma data específica</td></tr>
<tr><td><strong>MANIFEST</strong></td><td>Um índice em texto puro listando cada arquivo na tessera com seu checksum</td></tr>
<tr><td><strong>Tipo de memória</strong></td><td>Categoriza uma memória: momento, reflexão, cotidiano, relação ou objeto</td></tr>
<tr><td><strong>Nó</strong></td><td>Um dispositivo executando o daemon Tesseras, participando da rede P2P</td></tr>
<tr><td><strong>DHT</strong></td><td>Tabela hash distribuída — como os nós encontram ponteiros de tesseras sem um servidor central</td></tr>
<tr><td><strong>Bootstrap</strong></td><td>O processo de entrar na rede contactando nós semente conhecidos</td></tr>
</tbody>
</table>
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