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<div class="section" id="node-administration">
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<h1>Node administration<a class="headerlink" href="#node-administration" title="Permalink to this headline">¶</a></h1>
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<p>When a node is running, it exposes an embedded web server that lets you monitor it, upload and download attachments,
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access a REST API and so on.</p>
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<div class="section" id="uploading-and-downloading-attachments">
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<h2>Uploading and downloading attachments<a class="headerlink" href="#uploading-and-downloading-attachments" title="Permalink to this headline">¶</a></h2>
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<p>Attachments are files that add context to and influence the behaviour of transactions. They are always identified by
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hash and they are public, in that they propagate through the network to wherever they are needed.</p>
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<p>All attachments are zip files. Thus to upload a file to the ledger you must first wrap it into a zip (or jar) file. Then
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you can upload it by running this command from a UNIX terminal:</p>
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<div class="highlight-shell"><div class="highlight"><pre>curl -F <span class="nv">myfile</span><span class="o">=</span>@path/to/my/file.zip http://localhost:31338/attachments/upload
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</pre></div>
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<p>The attachment will be identified by the SHA-256 hash of the contents, which you can get by doing:</p>
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<div class="highlight-shell"><div class="highlight"><pre>shasum -a <span class="m">256</span> file.zip
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</pre></div>
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</div>
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<p>on a Mac or by using <code class="docutils literal"><span class="pre">sha256sum</span></code> on Linux. Alternatively, check the node logs. There is presently no way to manage
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attachments from a GUI.</p>
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<p>An attachment may be downloaded by fetching:</p>
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<div class="highlight-shell"><div class="highlight"><pre>http://localhost:31338/attachments/DECD098666B9657314870E192CED0C3519C2C9D395507A238338F8D003929DE9
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</pre></div>
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</div>
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<p>where DECD... is of course replaced with the hash identifier of your own attachment. Because attachments are always
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containers, you can also fetch a specific file within the attachment by appending its path, like this:</p>
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<div class="highlight-shell"><div class="highlight"><pre>http://localhost:31338/attachments/DECD098666B9657314870E192CED0C3519C2C9D395507A238338F8D003929DE9/path/within/zip.txt
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</pre></div>
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