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aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><a class="breadcrumbs__item" href="/codex"><span class="lsd-typography lsd-typography--body3">Home</span></a><li class="breadcrumbs__item"><span class="lsd-typography lsd-typography--body3 breadcrumbs__link">raw</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="lsd-typography lsd-typography--body3 breadcrumbs__link" itemprop="name">CODEX-STORE</span><meta itemprop="position" content="2"></li></ul></nav><div class="theme-doc-markdown markdown"><header><h1>CODEX-STORE</h1><div class="tocMobile_imaF"><div class="tocCollapsible_ROek theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_dxRj"><div></div><span class="lsd-typography lsd-typography--body2">On this page</span><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" class="lsd-icon lsd-icon--small lsd-icon--filled"><path d="M10.5 5.66125L9.6775 4.83875L7 7.51041L4.3225 4.83874L3.5 5.66125L7 9.16125L10.5 5.66125Z" fill="black"></path></svg></button></div></div></header><ul><li>Status: raw</li><li>Category: Standards Track</li><li>Editor: Codex Team</li><li>Contributors:<ul><li>Filip Dimitrijevic &lt;<a href="mailto:filip@status.im" target="_blank" rel="noopener noreferrer">filip@status.im</a>&gt;</li></ul></li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="abstract">Abstract<a href="#abstract" class="hash-link" aria-label="Direct link to Abstract" title="Direct link to Abstract">​</a></h2><p>This specification describes the Store Module,
the core storage abstraction in <a href="https://github.com/codex-storage/nim-codex" target="_blank" rel="noopener noreferrer">Codex</a>,
providing a unified interface for storing and retrieving content-addressed blocks
and associated metadata.</p><p>The Store Module decouples storage operations from underlying datastore semantics
by introducing the <code>BlockStore</code> interface,
which standardizes methods for storing and retrieving both ephemeral
and persistent blocks across different storage backends.
The module integrates a maintenance engine responsible for cleaning up
expired ephemeral data according to configured policies.</p><p>The Store Module is built on top of the generic
<a href="https://github.com/codex-storage/nim-datastore/blob/master/datastore/datastore.nim" target="_blank" rel="noopener noreferrer">DataStore (DS) interface</a>,
which is implemented by multiple backends such as SQLite, LevelDB,
and the filesystem.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="background--rationale--motivation">Background / Rationale / Motivation<a href="#background--rationale--motivation" class="hash-link" aria-label="Direct link to Background / Rationale / Motivation" title="Direct link to Background / Rationale / Motivation">​</a></h2><p>The primary design goal is to decouple storage operations from the underlying
datastore semantics by introducing the <code>BlockStore</code> interface.
This interface standardizes methods for storing and retrieving both ephemeral
and persistent blocks,
ensuring a consistent API across different storage backends.</p><p>The DataStore provides a KV-store abstraction with <code>Get</code>, <code>Put</code>, <code>Delete</code>,
and <code>Query</code> operations, with backend-dependent guarantees.
At a minimum, row-level consistency and basic batching are expected.</p><p>The DataStore supports:</p><ul><li>Namespace mounting for isolating backend usage</li><li>Layering backends (e.g., caching in front of persistent stores)</li><li>Flexible stacking and composition of storage proxies</li></ul><p>The current implementation has several limitations:</p><ul><li>No dataset-level operations or advanced batching support</li><li>Lack of consistent locking and concurrency control,
which may lead to inconsistencies during crashes or long-running operations
on block groups (e.g., reference count updates, expiration updates)</li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="theory--semantics">Theory / Semantics<a href="#theory--semantics" class="hash-link" aria-label="Direct link to Theory / Semantics" title="Direct link to Theory / Semantics">​</a></h2><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="blockstore-interface">BlockStore Interface<a href="#blockstore-interface" class="hash-link" aria-label="Direct link to BlockStore Interface" title="Direct link to BlockStore Interface">​</a></h3><p>The <code>BlockStore</code> interface provides the following methods:</p><table><thead><tr><th>Method</th><th>Description</th><th>Input</th><th>Output</th></tr></thead><tbody><tr><td><code>getBlock(cid: Cid)</code></td><td>Retrieve block by CID</td><td>CID</td><td><code>Future[?!Block]</code></td></tr><tr><td><code>getBlock(treeCid: Cid, index: Natural)</code></td><td>Retrieve block from a Merkle tree by leaf index</td><td>Tree CID, index</td><td><code>Future[?!Block]</code></td></tr><tr><td><code>getBlock(address: BlockAddress)</code></td><td>Retrieve block via unified address</td><td>BlockAddress</td><td><code>Future[?!Block]</code></td></tr><tr><td><code>getBlockAndProof(treeCid: Cid, index: Natural)</code></td><td>Retrieve block with Merkle proof</td><td>Tree CID, index</td><td><code>Future[?!(Block, CodexProof)]</code></td></tr><tr><td><code>getCid(treeCid: Cid, index: Natural)</code></td><td>Retrieve leaf CID from tree metadata</td><td>Tree CID, index</td><td><code>Future[?!Cid]</code></td></tr><tr><td><code>getCidAndProof(treeCid: Cid, index: Natural)</code></td><td>Retrieve leaf CID with inclusion proof</td><td>Tree CID, index</td><td><code>Future[?!(Cid, CodexProof)]</code></td></tr><tr><td><code>putBlock(blk: Block, ttl: Duration)</code></td><td>Store block with quota enforcement</td><td>Block, optional TTL</td><td><code>Future[?!void]</code></td></tr><tr><td><code>putCidAndProof(treeCid: Cid, index: Natural, blkCid: Cid, proof: CodexProof)</code></td><td>Store leaf metadata with ref counting</td><td>Tree CID, index, block CID, proof</td><td><code>Future[?!void]</code></td></tr><tr><td><code>hasBlock(...)</code></td><td>Check block existence (CID or tree leaf)</td><td>CID / Tree CID + index</td><td><code>Future[?!bool]</code></td></tr><tr><td><code>delBlock(...)</code></td><td>Delete block/tree leaf (with ref count checks)</td><td>CID / Tree CID + index</td><td><code>Future[?!void]</code></td></tr><tr><td><code>ensureExpiry(...)</code></td><td>Update expiry for block/tree leaf</td><td>CID / Tree CID + index, expiry timestamp</td><td><code>Future[?!void]</code></td></tr><tr><td><code>listBlocks(blockType: BlockType)</code></td><td>Iterate over stored blocks</td><td>Block type</td><td><code>Future[?!SafeAsyncIter[Cid]]</code></td></tr><tr><td><code>getBlockExpirations(maxNumber, offset)</code></td><td>Retrieve block expiry metadata</td><td>Pagination params</td><td><code>Future[?!SafeAsyncIter[BlockExpiration]]</code></td></tr><tr><td><code>blockRefCount(cid: Cid)</code></td><td>Get block reference count</td><td>CID</td><td><code>Future[?!Natural]</code></td></tr><tr><td><code>reserve(bytes: NBytes)</code></td><td>Reserve storage quota</td><td>Bytes</td><td><code>Future[?!void]</code></td></tr><tr><td><code>release(bytes: NBytes)</code></td><td>Release reserved quota</td><td>Bytes</td><td><code>Future[?!void]</code></td></tr><tr><td><code>start()</code></td><td>Initialize store</td><td>—</td><td><code>Future[void]</code></td></tr><tr><td><code>stop()</code></td><td>Gracefully shut down store</td><td>—</td><td><code>Future[void]</code></td></tr><tr><td><code>close()</code></td><td>Close underlying datastores</td><td>—</td><td><code>Future[void]</code></td></tr></tbody></table><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="store-implementations">Store Implementations<a href="#store-implementations" class="hash-link" aria-label="Direct link to Store Implementations" title="Direct link to Store Implementations">​</a></h3><p>The Store module provides three concrete implementations of the <code>BlockStore</code>
interface,
each optimized for a specific role in the Codex architecture:
RepoStore, NetworkStore, and CacheStore.</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="repostore">RepoStore<a href="#repostore" class="hash-link" aria-label="Direct link to RepoStore" title="Direct link to RepoStore">​</a></h4><p>The RepoStore is a persistent <code>BlockStore</code> implementation
that interfaces directly with low-level storage backends,
such as hard drives and databases.</p><p>It uses two distinct DataStore backends:</p><ul><li>FileSystem — for storing raw block data</li><li>LevelDB — for storing associated metadata</li></ul><p>This separation ensures optimal performance,
allowing block data operations to run efficiently
while metadata updates benefit from a fast key-value database.</p><p>Characteristics:</p><ul><li>Persistent storage via datastore backends</li><li>Quota management with precise usage tracking</li><li>TTL (time-to-live) support with automated expiration</li><li>Metadata storage for block size, reference count, and expiry</li><li>Transaction-like operations implemented through reference counting</li></ul><p>Configuration:</p><ul><li><code>quotaMaxBytes</code>: Maximum storage quota</li><li><code>blockTtl</code>: Default TTL for stored blocks</li><li><code>postFixLen</code>: CID key postfix length for sharding</li></ul><div class="language-text codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-text codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">┌─────────────────────────────────────────────────────────────┐</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ RepoStore │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">├─────────────────────────────────────────────────────────────┤</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ ┌─────────────┐ ┌──────────────────────────┐ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ repoDs │ │ metaDs │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ (Datastore) │ │ (TypedDatastore) │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ │ │ │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ Block Data: │ │ Metadata: │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ - Raw bytes │ │ - BlockMetadata │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ - CID-keyed │ │ - LeafMetadata │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ │ │ - QuotaUsage │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ │ │ - Block counts │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ └─────────────┘ └──────────────────────────┘ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">└─────────────────────────────────────────────────────────────┘</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="networkstore">NetworkStore<a href="#networkstore" class="hash-link" aria-label="Direct link to NetworkStore" title="Direct link to NetworkStore">​</a></h4><p>The NetworkStore is a composite <code>BlockStore</code> that combines local persistence
with network-based retrieval for distributed content access.</p><p>It follows a local-first strategy —
attempting to retrieve or store blocks locally first,
and falling back to network retrieval via the Block Exchange Engine
if the block is not available locally.</p><p>Characteristics:</p><ul><li>Integrates local storage with network retrieval</li><li>Works seamlessly with the block exchange engine for peer-to-peer access</li><li>Transparent block fetching from remote sources</li><li>Local caching of blocks retrieved from the network for future access</li></ul><div class="language-text codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-text codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">┌────────────────────────────────────────────────────────────┐</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ NetworkStore │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">├────────────────────────────────────────────────────────────┤</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ ┌─────────────────┐ ┌──────────────────────┐ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ LocalStore - RS │ │ BlockExcEngine │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ • Store blocks │ │ • Request blocks │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ • Get blocks │ │ • Resolve blocks │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ └─────────────────┘ └──────────────────────┘ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ └──────────────┬───────────────┘ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ ┌─────────────┐ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │BS Interface │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ • getBlock │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ • putBlock │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ • hasBlock │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ │ • delBlock │ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">│ └─────────────┘ │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">└────────────────────────────────────────────────────────────┘</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="cachestore">CacheStore<a href="#cachestore" class="hash-link" aria-label="Direct link to CacheStore" title="Direct link to CacheStore">​</a></h4><p>The CacheStore is an in-memory <code>BlockStore</code> implementation
designed for fast access to frequently used blocks.</p><p>This store maintains two separate LRU caches:</p><ol><li>Block Cache — <code>LruCache[Cid, Block]</code><ul><li>Stores actual block data indexed by CID</li><li>Acts as the primary cache for block content</li></ul></li><li>CID/Proof Cache — <code>LruCache[(Cid, Natural), (Cid, CodexProof)]</code><ul><li>Maps <code>(treeCid, index)</code> to <code>(blockCid, proof)</code></li><li>Supports direct access to block proofs keyed by <code>treeCid</code> and index</li></ul></li></ol><p>Characteristics:</p><ul><li>O(1) access times for cached data</li><li>LRU eviction policy for memory management</li><li>Configurable maximum cache size</li><li>No persistence — cache contents are lost on restart</li><li>No TTL — blocks remain in cache until evicted</li></ul><p>Configuration:</p><ul><li><code>cacheSize</code>: Maximum total cache size (bytes)</li><li><code>chunkSize</code>: Minimum block size unit</li></ul><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="storage-layout">Storage Layout<a href="#storage-layout" class="hash-link" aria-label="Direct link to Storage Layout" title="Direct link to Storage Layout">​</a></h3><table><thead><tr><th>Key Pattern</th><th>Data Type</th><th>Description</th><th>Example</th></tr></thead><tbody><tr><td><code>repo/manifests/{XX}/{full-cid}</code></td><td>Raw bytes</td><td>Manifest block data</td><td><code>repo/manifests/Cd/bafy...Cd → [data]</code></td></tr><tr><td><code>repo/blocks/{XX}/{full-cid}</code></td><td>Raw bytes</td><td>Block data</td><td><code>repo/blocks/Ab/bafy...Ab → [data]</code></td></tr><tr><td><code>meta/ttl/{cid}</code></td><td>BlockMetadata</td><td>Expiry, size, refCount</td><td><code>meta/ttl/bafy... → {...}</code></td></tr><tr><td><code>meta/proof/{treeCid}/{index}</code></td><td>LeafMetadata</td><td>Merkle proof for leaf</td><td><code>meta/proof/bafy.../42 → {...}</code></td></tr><tr><td><code>meta/total</code></td><td>Natural</td><td>Total stored blocks</td><td><code>meta/total → 12039</code></td></tr><tr><td><code>meta/quota/used</code></td><td>NBytes</td><td>Used quota</td><td><code>meta/quota/used → 52428800</code></td></tr><tr><td><code>meta/quota/reserved</code></td><td>NBytes</td><td>Reserved quota</td><td><code>meta/quota/reserved → 104857600</code></td></tr></tbody></table><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="workflows">Workflows<a href="#workflows" class="hash-link" aria-label="Direct link to Workflows" title="Direct link to Workflows">​</a></h3><p>The following flow charts summarize how put, get, and delete operations
interact with the shared block storage, metadata store,
and quota management systems.</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="putblock">PutBlock<a href="#putblock" class="hash-link" aria-label="Direct link to PutBlock" title="Direct link to PutBlock">​</a></h4><p>The following flow chart shows how a block is stored
with metadata and quota management:</p><div class="language-text codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-text codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">putBlock: blk, ttl</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Calculate expiry = now + ttl</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; storeBlock: blk, expiry</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Block empty?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; Yes: Return AlreadyInStore</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; No: Create metadata &amp; block keys</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Block metadata exists?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; Yes: Size matches?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ ├─&gt; Yes: Return AlreadyInStore</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ └─&gt; No: Return Error</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; No: Create new metadata</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Store block data</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Store successful?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; No: Return Error</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; Yes: Update quota usage</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Quota update OK?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; No: Rollback: Delete block → Return Error</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; Yes: Update total blocks count</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Trigger onBlockStored callback</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> └─&gt; Return Success</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="getblock">GetBlock<a href="#getblock" class="hash-link" aria-label="Direct link to GetBlock" title="Direct link to GetBlock">​</a></h4><p>The following flow chart explains how a block is retrieved by CID
or tree reference,
resolving metadata if necessary,
and returning the block or an error:</p><div class="language-text codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-text codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">getBlock: cid/address</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Input type?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; BlockAddress with leaf</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ └─&gt; getLeafMetadata: treeCid, index</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ ├─&gt; Leaf metadata found?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ │ ├─&gt; No: Return BlockNotFoundError</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ │ └─&gt; Yes: Extract block CID from metadata</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; CID: Direct CID access</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; CID empty?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; Yes: Return empty block</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; No: Create prefix key</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Query datastore: repoDs.get</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Block found?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; No: Error type?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ ├─&gt; DatastoreKeyNotFound: Return BlockNotFoundError</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ └─&gt; Other: Return Error</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; Yes: Create Block with verification</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> └─&gt; Return Block</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="delblock">DelBlock<a href="#delblock" class="hash-link" aria-label="Direct link to DelBlock" title="Direct link to DelBlock">​</a></h4><p>The following flow chart shows how a block is deleted
when it is unused or expired,
including metadata cleanup and quota/counter updates:</p><div class="language-text codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-text codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">delBlock: cid</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; delBlockInternal: cid</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; CID empty?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; Yes: Return Deleted</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; No: tryDeleteBlock: cid, now</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Metadata exists?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; No: Check if block exists in repo</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ ├─&gt; Block exists?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ │ ├─&gt; Yes: Warn &amp; remove orphaned block</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ │ └─&gt; No: Return NotFound</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ │ └─&gt; Return NotFound</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; Yes: refCount = 0 OR expired?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; No: Return InUse</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; Yes: Delete block &amp; metadata → Return Deleted</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Handle result</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ├─&gt; Result type?</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; InUse: Return Error: Cannot delete dataset block</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ ├─&gt; NotFound: Return Success: Ignore</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; Deleted: Update total blocks count</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; Update quota usage</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │ └─&gt; Return Success</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> │</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> └─&gt; Return Success</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="data-models">Data Models<a href="#data-models" class="hash-link" aria-label="Direct link to Data Models" title="Direct link to Data Models">​</a></h3><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="stores">Stores<a href="#stores" class="hash-link" aria-label="Direct link to Stores" title="Direct link to Stores">​</a></h4><div class="language-nim codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-nim codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">RepoStore* = ref object of BlockStore</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> postFixLen*: int</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repoDs*: Datastore</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> metaDs*: TypedDatastore</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> clock*: Clock</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> quotaMaxBytes*: NBytes</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> quotaUsage*: QuotaUsage</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> totalBlocks*: Natural</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> blockTtl*: Duration</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> started*: bool</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">NetworkStore* = ref object of BlockStore</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> engine*: BlockExcEngine</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> localStore*: BlockStore</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">CacheStore* = ref object of BlockStore</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> currentSize*: NBytes</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> size*: NBytes</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> cache: LruCache[Cid, Block]</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> cidAndProofCache: LruCache[(Cid, Natural), (Cid, CodexProof)]</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="metadata-types">Metadata Types<a href="#metadata-types" class="hash-link" aria-label="Direct link to Metadata Types" title="Direct link to Metadata Types">​</a></h4><div class="language-nim codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-nim codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">BlockMetadata* {.serialize.} = object</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> expiry*: SecondsSince1970</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> size*: NBytes</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> refCount*: Natural</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">LeafMetadata* {.serialize.} = object</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> blkCid*: Cid</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> proof*: CodexProof</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">BlockExpiration* {.serialize.} = object</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> cid*: Cid</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> expiry*: SecondsSince1970</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">QuotaUsage* {.serialize.} = object</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> used*: NBytes</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> reserved*: NBytes</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="functional-requirements">Functional Requirements<a href="#functional-requirements" class="hash-link" aria-label="Direct link to Functional Requirements" title="Direct link to Functional Requirements">​</a></h3><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="available-today">Available Today<a href="#available-today" class="hash-link" aria-label="Direct link to Available Today" title="Direct link to Available Today">​</a></h4><ul><li><p>Atomic Block Operations</p><ul><li>Store, retrieve, and delete operations must be atomic.</li><li>Support retrieval via:<ul><li>Direct CID</li><li>Tree-based addressing (<code>treeCid + index</code>)</li><li>Unified block address</li></ul></li></ul></li><li><p>Metadata Management</p><ul><li>Store protocol-level metadata (e.g., storage proofs, quota usage).</li><li>Store block-level metadata (e.g., reference counts, total block count).</li></ul></li><li><p>Multi-Datastore Support</p><ul><li>Pluggable datastore interface supporting various backends.</li><li>Typed datastore operations for metadata type safety.</li></ul></li><li><p>Lifecycle &amp; Maintenance</p><ul><li>BlockMaintainer service for removing expired data.</li><li>Configurable maintenance intervals (default: 10 min).</li><li>Batch processing (default: 1000 blocks/cycle).</li></ul></li></ul><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="future-requirements">Future Requirements<a href="#future-requirements" class="hash-link" aria-label="Direct link to Future Requirements" title="Direct link to Future Requirements">​</a></h4><ul><li><p>Transaction Rollback &amp; Error Recovery</p><ul><li>Rollback support for failed multi-step operations.</li><li>Consistent state restoration after failures.</li></ul></li><li><p>Dataset-Level Operations</p><ul><li>Handle Dataset level meta data.</li><li>Batch operations for dataset block groups.</li></ul></li><li><p>Concurrency Control</p><ul><li>Consistent locking and coordination mechanisms to prevent inconsistencies
during crashes or long-running operations.</li></ul></li><li><p>Lifecycle &amp; Maintenance</p><ul><li>Cooperative scheduling to avoid blocking.</li><li>State tracking for large datasets.</li></ul></li></ul><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="non-functional-requirements">Non-Functional Requirements<a href="#non-functional-requirements" class="hash-link" aria-label="Direct link to Non-Functional Requirements" title="Direct link to Non-Functional Requirements">​</a></h3><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="currently-implemented">Currently Implemented<a href="#currently-implemented" class="hash-link" aria-label="Direct link to Currently Implemented" title="Direct link to Currently Implemented">​</a></h4><ul><li><p>Security</p><ul><li>Verify block content integrity upon retrieval.</li><li>Enforce quotas to prevent disk exhaustion.</li><li>Safe orphaned data cleanup.</li></ul></li><li><p>Scalability</p><ul><li>Configurable storage quotas (default: 20 GiB).</li><li>Pagination for metadata queries.</li><li>Reference counting–based garbage collection.</li></ul></li><li><p>Reliability</p><ul><li>Metrics collection (<code>codex_repostore_*</code>).</li><li>Graceful shutdown with resource cleanup.</li></ul></li></ul><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="planned-enhancements">Planned Enhancements<a href="#planned-enhancements" class="hash-link" aria-label="Direct link to Planned Enhancements" title="Direct link to Planned Enhancements">​</a></h4><ul><li><p>Performance</p><ul><li>Batch metadata updates.</li><li>Efficient key lookups with configurable prefix lengths.</li><li>Support for both fast and slower storage tiers.</li><li>Streaming APIs optimized for extremely large datasets.</li></ul></li><li><p>Security</p><ul><li>Finer-grained quota enforcement across tenants/namespaces.</li></ul></li><li><p>Reliability</p><ul><li>Stronger rollback semantics for multi-node consistency.</li><li>Auto-recovery from inconsistent states.</li></ul></li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="wire-format-specification--syntax">Wire Format Specification / Syntax<a href="#wire-format-specification--syntax" class="hash-link" aria-label="Direct link to Wire Format Specification / Syntax" title="Direct link to Wire Format Specification / Syntax">​</a></h2><p>The Store Module does not define a wire format specification.
It provides an internal storage abstraction
for <a href="https://github.com/codex-storage/nim-codex" target="_blank" rel="noopener noreferrer">Codex</a>
and relies on underlying datastore implementations for serialization
and persistence.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="securityprivacy-considerations">Security/Privacy Considerations<a href="#securityprivacy-considerations" class="hash-link" aria-label="Direct link to Security/Privacy Considerations" title="Direct link to Security/Privacy Considerations">​</a></h2><ul><li><p>Block Integrity: The Store Module verifies block content integrity
upon retrieval to ensure data has not been corrupted or tampered with.</p></li><li><p>Quota Enforcement: Storage quotas are enforced
to prevent disk exhaustion attacks.
The default quota is 20 GiB, but this is configurable.</p></li><li><p>Safe Data Cleanup: The maintenance engine safely removes expired
ephemeral data and orphaned blocks without compromising data integrity.</p></li><li><p>Reference Counting: Reference counting–based garbage collection ensures
that blocks are not deleted while they are still in use by other components.</p></li></ul><p>Future security enhancements include finer-grained quota enforcement
across tenants/namespaces and stronger rollback semantics
for multi-node consistency.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="rationale">Rationale<a href="#rationale" class="hash-link" aria-label="Direct link to Rationale" title="Direct link to Rationale">​</a></h2><p>The Store Module design prioritizes:</p><ul><li><p>Decoupling: By introducing the <code>BlockStore</code> interface,
the Store Module decouples storage operations from underlying
datastore semantics,
allowing for flexible backend implementations.</p></li><li><p>Performance: The separation of block data (filesystem) and metadata (LevelDB)
in RepoStore ensures optimal performance for both types of operations.</p></li><li><p>Flexibility: The three store implementations
(RepoStore, NetworkStore, CacheStore) provide different trade-offs
between persistence, network access, and performance,
allowing Codex to optimize for different use cases.</p></li><li><p>Scalability: Reference counting, quota management, and pagination enable
the Store Module to scale to large datasets
while preventing resource exhaustion.</p></li></ul><p>The current limitations (lack of dataset-level operations, inconsistent locking)
are acknowledged and will be addressed in future versions.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="copyright">Copyright<a href="#copyright" class="hash-link" aria-label="Direct link to Copyright" title="Direct link to Copyright">​</a></h2><p>Copyright and related rights waived via <a href="https://creativecommons.org/publicdomain/zero/1.0/" target="_blank" rel="noopener noreferrer">CC0</a>.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="references">References<a href="#references" class="hash-link" aria-label="Direct link to References" title="Direct link to References">​</a></h2><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="normative">normative<a href="#normative" class="hash-link" aria-label="Direct link to normative" title="Direct link to normative">​</a></h3><ul><li><a href="https://github.com/codex-storage/nim-codex" target="_blank" rel="noopener noreferrer">Codex</a></li><li><a href="https://github.com/codex-storage/codex-docs-obsidian/blob/main/10%20Notes/Specs/Component%20Specification%20-%20Store.md" target="_blank" rel="noopener noreferrer">Component Specification - Store</a></li></ul><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="informative">informative<a href="#informative" class="hash-link" aria-label="Direct link to informative" title="Direct link to informative">​</a></h3><ul><li><a href="https://github.com/codex-storage/nim-datastore" target="_blank" rel="noopener noreferrer">nim-datastore</a></li><li><a href="https://github.com/codex-storage/nim-datastore/blob/master/datastore/datastore.nim" target="_blank" rel="noopener noreferrer">DataStore Interface</a></li><li><a href="https://github.com/status-im/nim-chronos" target="_blank" rel="noopener noreferrer">chronos</a> - Async runtime</li><li><a href="https://github.com/status-im/nim-libp2p" target="_blank" rel="noopener noreferrer">libp2p</a> - P2P networking and CID types</li><li><a href="https://github.com/codex-storage/questionable" target="_blank" rel="noopener noreferrer">questionable</a> - Error handling</li><li><a href="https://github.com/status-im/lrucache" target="_blank" rel="noopener noreferrer">lrucache</a> - LRU cache implementation</li></ul></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/codex/raw/codex-prover"><div class="icon_S7Kx m_thRi"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M11.667 6.417h-7.1l3.261-3.261L7 2.333 2.333 7 7 11.667l.823-.823-3.255-3.26h7.099V6.417Z" fill="#fff"></path></svg></div><span class="lsd-typography lsd-typography--body2 pagination-nav__label">CODEX-PROVER</span></a><a class="pagination-nav__link pagination-nav__link--next" href="/codex/raw/community-history"><span class="lsd-typography lsd-typography--body2 pagination-nav__label">CODEX-COMMUNITY-HISTORY</span><div class="icon_S7Kx m_thRi"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="m7 2.333-.823.823 3.255 3.26H2.333v1.167h7.1l-3.256 3.261.823.823L11.667 7 7 2.333Z" fill="#fff"></path></svg></div></a></nav></div></div><div class="gap1_XuuQ"></div><div class="toc_pP_5"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#abstract" class="table-of-contents__link toc-highlight">Abstract</a></li><li><a href="#background--rationale--motivation" class="table-of-contents__link toc-highlight">Background / Rationale / Motivation</a></li><li><a href="#theory--semantics" class="table-of-contents__link toc-highlight">Theory / Semantics</a><ul><li><a href="#blockstore-interface" class="table-of-contents__link toc-highlight">BlockStore Interface</a></li><li><a href="#store-implementations" class="table-of-contents__link toc-highlight">Store Implementations</a></li><li><a href="#storage-layout" class="table-of-contents__link toc-highlight">Storage Layout</a></li><li><a href="#workflows" class="table-of-contents__link toc-highlight">Workflows</a></li><li><a href="#data-models" class="table-of-contents__link toc-highlight">Data Models</a></li><li><a href="#functional-requirements" class="table-of-contents__link toc-highlight">Functional Requirements</a></li><li><a href="#non-functional-requirements" class="table-of-contents__link toc-highlight">Non-Functional Requirements</a></li></ul></li><li><a href="#wire-format-specification--syntax" class="table-of-contents__link toc-highlight">Wire Format Specification / Syntax</a></li><li><a href="#securityprivacy-considerations" class="table-of-contents__link toc-highlight">Security/Privacy Considerations</a></li><li><a href="#rationale" class="table-of-contents__link toc-highlight">Rationale</a></li><li><a href="#copyright" 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