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<h1 class="uk-article-title">How to Use the Atlas Network</h1>
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<span data-uk-icon="icon: pencil; ratio: 1.2"></span> Edit this page on Github</a>
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<span style="font-family:Wingdings">w</span> Sep 10, 2018
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</time>
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</div>
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<div class="article-content">
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<p class="no_toc">This section teaches you how to use the Atlas network, it contains the
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following sections:</p>
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<ul id="markdown-toc">
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<li><a href="#the-api" id="markdown-toc-the-api">The API</a></li>
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<li><a href="#looking-up-chunks" id="markdown-toc-looking-up-chunks">Looking up Chunks</a></li>
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<li><a href="#adding-a-new-chunk" id="markdown-toc-adding-a-new-chunk">Adding a New Chunk</a></li>
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<li><a href="#propagating-chunks" id="markdown-toc-propagating-chunks">Propagating Chunks</a></li>
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</ul>
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<h2 id="the-api">The API</h2>
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<p>While the Blockstack software stack expects that Atlas-hosted data is made up of
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DNS zone files, Atlas itself does not enforce this (nor does it care about the
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format of its chunks). It is designed as a general-purpose chunk store.
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Nevertheless, the ubiquitous use of Atlas to store data as DNS zone files has
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had an influence on its API design—fields and method names frequently allude
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to zone files and zone file hashes. This is intentional.</p>
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<p>The <a href="https://core.blockstack.org">public BNS API endpoint</a> does not support
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resolving Atlas chunks that do not encode Gaia routing information or subdomain
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information. To directly interact with Atlas, developers will need to install
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<a href="https://github.com/blockstack/blockstack-core">Blockstack Core</a> and use its
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Python client libraries for these examples.</p>
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<h2 id="looking-up-chunks">Looking up Chunks</h2>
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<p>All Atlas chunks are addressed by the RIPEMD160 hash of the SHA256 hash of the
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chunk data. A client can query up to 100 chunks in one RPC call.</p>
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<p>A client can look up a chunk with the <code class="highlighter-rouge">get_zonefiles()</code> method. If successful,
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the returned payload will be a <code class="highlighter-rouge">dict</code> with a <code class="highlighter-rouge">zonefiles</code> key that maps the chunk
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hashes to their respective data.</p>
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<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="o">>>></span> <span class="kn">import</span> <span class="nn">blockstack</span>
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<span class="o">>>></span> <span class="n">data</span> <span class="o">=</span> <span class="n">blockstack</span><span class="o">.</span><span class="n">lib</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">get_zonefiles</span><span class="p">(</span><span class="s">'https://node.blockstack.org:6263'</span><span class="p">,</span> <span class="p">[</span><span class="s">'1b89a685f4c4ea245ce9433d0b29166c22175ab4'</span><span class="p">])</span>
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<span class="o">>>></span> <span class="k">print</span> <span class="n">data</span><span class="p">[</span><span class="s">'zonefiles'</span><span class="p">][</span><span class="s">'1b89a685f4c4ea245ce9433d0b29166c22175ab4'</span><span class="p">]</span>
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<span class="err">$</span><span class="n">ORIGIN</span> <span class="n">duckduckgo_tor</span><span class="o">.</span><span class="nb">id</span>
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<span class="err">$</span><span class="n">TTL</span> <span class="mi">3600</span>
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<span class="n">tor</span> <span class="n">TXT</span> <span class="s">"3g2upl4pq6kufc4m.onion"</span>
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<span class="o">>>></span>
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</code></pre>
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</div>
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<p>(This particular chunk happens to be associated with the BNS name
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<code class="highlighter-rouge">duckduckgo_tor.id</code>).</p>
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<h2 id="adding-a-new-chunk">Adding a New Chunk</h2>
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<p>The only way to add a chunk to Atlas is to do so through an on-chain name in
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BNS. Adding a new chunk is a two-step process:</p>
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<ul>
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<li>The name owner announces the chunk hash as a name’s state
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via a <code class="highlighter-rouge">NAME_REGISTRATION</code>, <code class="highlighter-rouge">NAME_UPDATE</code>, <code class="highlighter-rouge">NAME_RENEWAL</code>, or <code class="highlighter-rouge">NAME_IMPORT</code> transaction.</li>
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<li>Once the transaction is confirmed and processed by BNS, the name owner
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broadcasts the matching zone file.</li>
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</ul>
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<p>Setting a name’s state to be the hash of a chunk is beyond the scope of this
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document, since it needs to be done through a BNS client.
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See the relevant documentation for
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<a href="https://github.com/blockstack/blockstack.js">blockstack.js</a> and the <a href="https://github.com/blockstack/blockstack-browser">Blockstack
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Browser</a> for doing this.</p>
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<p>Once the name operation is confirmed, you can announce the data to the
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Atlas network. You can do so with the Python client as follows:</p>
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<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="o">>>></span> <span class="kn">import</span> <span class="nn">blockstack</span>
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<span class="o">>>></span> <span class="kn">import</span> <span class="nn">base64</span>
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<span class="o">>>></span> <span class="n">data</span> <span class="o">=</span> <span class="s">"..."</span> <span class="c"># this is the chunk data you will announce</span>
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<span class="o">>>></span> <span class="n">data_b64</span> <span class="o">=</span> <span class="n">base64</span><span class="o">.</span><span class="n">b64encode</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
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<span class="o">>>></span> <span class="n">result</span> <span class="o">=</span> <span class="n">blockstack</span><span class="o">.</span><span class="n">lib</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">put_zonefiles</span><span class="p">(</span><span class="s">'https://node.blockstack.org:6263'</span><span class="p">,</span> <span class="p">[</span><span class="n">data_b64</span><span class="p">])</span>
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<span class="o">>>></span> <span class="k">assert</span> <span class="n">result</span><span class="p">[</span><span class="s">'saved'</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="mi">1</span>
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<span class="o">>>></span>
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</code></pre>
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</div>
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<p>At most five chunks can be announced in one RPC call.
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Note that the data must be base64-encoded before it can be announced.</p>
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<p>When the <code class="highlighter-rouge">put_zonefiles()</code> method succeeds, it returns a <code class="highlighter-rouge">dict</code> with a list
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under the <code class="highlighter-rouge">saved</code> key. Here, <code class="highlighter-rouge">result['saved'][i]</code> will be 1 if the <code class="highlighter-rouge">i</code>th
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chunk given to <code class="highlighter-rouge">put_zonefiles()</code> was saved by the node, and 0 if not.
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The node will not save a chunk if it is too big, or if it has not yet processed
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the name operation that contained the chunk’s hash.</p>
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<p>The <code class="highlighter-rouge">put_zonefiles()</code> method is idempotent.</p>
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<h2 id="propagating-chunks">Propagating Chunks</h2>
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<p>Atlas peers will each store a copy of the chunks you announce. In the
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background, they will asynchronously announce to one another which chunks they
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have available, and replicate them to one another in a rarest-first order (much
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like how BitTorrent works). Eventually, every Atlas peer will receive the
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chunk.</p>
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<p>However, developers can accelerate this process by eagerly propagating chunks.
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To do so, they can ask an Atlas peer for its immediate neighbors in the Atlas
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peer graph, and replicate the chunk to each of them as well.</p>
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<p>For example, this code will replicate the chunk to not only
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<code class="highlighter-rouge">https://node.blockstack.org:6263</code>, but also to its immediate neighbors.</p>
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<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="o">>>></span> <span class="kn">import</span> <span class="nn">blockstack</span>
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<span class="o">>>></span> <span class="kn">import</span> <span class="nn">base64</span>
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<span class="o">>>></span> <span class="n">data</span> <span class="o">=</span> <span class="s">"..."</span> <span class="c"># this is the chunk you will replicate widely</span>
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<span class="o">>>></span> <span class="n">data_b64</span> <span class="o">=</span> <span class="n">base64</span><span class="o">.</span><span class="n">b64encode</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
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<span class="o">>>></span>
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<span class="o">>>></span> <span class="n">result</span> <span class="o">=</span> <span class="n">blockstack</span><span class="o">.</span><span class="n">lib</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">get_atlas_peers</span><span class="p">(</span><span class="s">'https://node.blockstack.org:6263'</span><span class="p">)</span>
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<span class="o">>>></span> <span class="n">neighbors</span> <span class="o">=</span> <span class="n">result</span><span class="p">[</span><span class="s">'peers'</span><span class="p">]</span>
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<span class="o">>>></span> <span class="k">print</span> <span class="s">", "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">neighbors</span><span class="p">)</span>
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<span class="mf">13.65</span><span class="o">.</span><span class="mf">207.163</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">52.225</span><span class="o">.</span><span class="mf">128.191</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="n">node</span><span class="o">.</span><span class="n">blockstack</span><span class="o">.</span><span class="n">org</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">23.102</span><span class="o">.</span><span class="mf">162.7</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">52.167</span><span class="o">.</span><span class="mf">230.235</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">23.102</span><span class="o">.</span><span class="mf">162.124</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">52.151</span><span class="o">.</span><span class="mf">59.26</span><span class="p">:</span><span class="mi">6264</span><span class="p">,</span> <span class="mf">13.92</span><span class="o">.</span><span class="mf">134.106</span><span class="p">:</span><span class="mi">6264</span>
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<span class="o">>>></span>
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<span class="o">>>></span> <span class="k">for</span> <span class="n">neighbor</span> <span class="ow">in</span> <span class="n">neighbors</span><span class="p">:</span>
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<span class="o">...</span> <span class="n">result</span> <span class="o">=</span> <span class="n">blockstack</span><span class="o">.</span><span class="n">lib</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">put_zonefiles</span><span class="p">(</span><span class="n">neighbor</span><span class="p">,</span> <span class="p">[</span><span class="n">data_b64</span><span class="p">])</span>
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<span class="o">...</span> <span class="k">assert</span> <span class="n">result</span><span class="p">[</span><span class="s">'saved'</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="mi">1</span>
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<span class="o">...</span>
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<span class="o">>>></span>
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</code></pre>
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</div>
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<p>This is not strictly necessary, but it does help accelerate chunk replication
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and makes it less likely that a chunk will get lost due to individual node
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failures.</p>
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