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< h1 > Running a notary service< a class = "headerlink" href = "#running-a-notary-service" title = "Permalink to this headline" > ¶< / a > < / h1 >
< p > At present we have several prototype notary implementations:< / p >
< ol class = "arabic simple" >
< li > < code class = "docutils literal" > < span class = "pre" > SimpleNotaryService< / span > < / code > (single node) – commits the provided transaction input states without any validation.< / li >
< li > < code class = "docutils literal" > < span class = "pre" > ValidatingNotaryService< / span > < / code > (single node) – retrieves and validates the whole transaction history
(including the given transaction) before committing.< / li >
< 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
the committed states in a distributed collection replicated and persisted in a Raft cluster. For the consensus layer
we are using the < a class = "reference external" href = "http://atomix.io/copycat/" > Copycat< / a > framework.< / li >
< / ol >
< p > To have a node run a notary service, you need to set appropriate configuration values before starting it
(see < a class = "reference internal" href = "corda-configuration-file.html" > < span class = "doc" > Node configuration< / span > < / a > for reference).< / p >
< 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 >
< 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 >
< / 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 >
< / pre > < / div >
< / div >
< 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 < span class = "xref std std-ref" > notary-demo< / span > .< / p >
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