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<div class="section" id="running-a-notary-service">
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<h1>Running a notary service<a class="headerlink" href="#running-a-notary-service" title="Permalink to this headline">¶</a></h1>
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<p>At present we have several prototype notary implementations:</p>
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<ol class="arabic simple">
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<li><code class="docutils literal"><span class="pre">SimpleNotaryService</span></code> (single node) – commits the provided transaction input states without any validation.</li>
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<li><code class="docutils literal"><span class="pre">ValidatingNotaryService</span></code> (single node) – retrieves and validates the whole transaction history
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(including the given transaction) before committing.</li>
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<li><code class="docutils literal"><span class="pre">RaftValidatingNotaryService</span></code> (distributed) – functionally equivalent to <code class="docutils literal"><span class="pre">ValidatingNotaryService</span></code>, but stores
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the committed states in a distributed collection replicated and persisted in a Raft cluster. For the consensus layer
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we are using the <a class="reference external" href="http://atomix.io/copycat/">Copycat</a> framework.</li>
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</ol>
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<p>To have a node run a notary service, you need to set appropriate configuration values before starting it
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(see <a class="reference internal" href="corda-configuration-file.html"><span class="doc">Node configuration</span></a> for reference).</p>
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<p>For <code class="docutils literal"><span class="pre">SimpleNotaryService</span></code>, simply add the following service id to the list of advertised services:</p>
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span><span class="n">extraAdvertisedServiceIds</span><span class="p">:</span> <span class="s">"net.corda.notary.simple"</span>
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</pre></div>
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<p>For <code class="docutils literal"><span class="pre">ValidatingNotaryService</span></code> it is:</p>
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span><span class="n">extraAdvertisedServiceIds</span><span class="p">:</span> <span class="s">"net.corda.notary.validating"</span>
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</pre></div>
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<p>Setting up a <code class="docutils literal"><span class="pre">RaftValidatingNotaryService</span></code> is currently slightly more involved and is not recommended for prototyping
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purposes. There is work in progress to simplify it. To see it in action, however, you can try out the <a class="reference internal" href="running-the-demos.html#notary-demo"><span class="std std-ref">Distributed Notary demo</span></a>.</p>
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