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<a href="index.html" class="icon icon-home"> R3 Corda
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API reference: <a href="api/kotlin/corda/index.html">Kotlin</a>/ <a href="api/javadoc/index.html">JavaDoc</a>
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<li class="toctree-l1"><a class="reference internal" href="running-a-notary.html">Running a notary service</a></li>
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<li class="toctree-l1"><a class="reference internal" href="oracles.html">Writing oracle services</a></li>
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<li class="toctree-l1"><a class="reference internal" href="tutorial-attachments.html">Using attachments</a></li>
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<li class="toctree-l1"><a class="reference internal" href="event-scheduling.html">Event scheduling</a></li>
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<li class="toctree-l1"><a class="reference internal" href="network-simulator.html">Network Simulator</a></li>
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<li class="toctree-l1"><a class="reference internal" href="merkle-trees.html">Transaction tear-offs</a></li>
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<li class="toctree-l1"><a class="reference internal" href="loadtesting.html">Load testing</a></li>
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<li class="toctree-l1"><a class="reference internal" href="setting-up-a-corda-network.html">What is a corda network?</a></li>
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<li class="toctree-l1"><a class="reference internal" href="secure-coding-guidelines.html">Secure coding guidelines</a></li>
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<li class="toctree-l1"><a class="reference internal" href="release-notes.html">Release notes</a></li>
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<li class="toctree-l1"><a class="reference internal" href="building-the-docs.html">Building the documentation</a></li>
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<li class="toctree-l1"><a class="reference internal" href="publishing-corda.html">Publishing Corda</a></li>
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<li class="toctree-l1"><a class="reference internal" href="azure-vm.html">Working with the Corda Demo on Azure Marketplace</a></li>
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<p class="caption"><span class="caption-text">Glossary</span></p>
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<div class="section" id="corda-ecosystem">
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<h1>Corda ecosystem<a class="headerlink" href="#corda-ecosystem" title="Permalink to this headline">¶</a></h1>
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<p>A Corda network consists of the following components:</p>
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<ul class="simple">
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<li>Nodes, where each node represents a JVM run-time environment hosting Corda services and executing applications (“CorDapps”).
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Nodes communicate using AMQP/1.0 over TLS.</li>
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<li>A permissioning service that automates the process of provisioning TLS certificates.</li>
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<li>A network map service that publishes information about nodes on the network.</li>
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<li>One or more pluggable notary service types (which may be distributed over multiple nodes).
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A notary guarantees uniqueness and validity of transactions.</li>
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<li>Zero or more oracle services. An oracle is a well known service that signs transactions if they state a fact and that fact is considered to be true.</li>
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<li>CorDapps which represent participant applications that execute contract code and communicate using the flow framework to achieve consensus over some business activity</li>
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<li>Standalone Corda applications that provide manageability and tooling support to a Corda network.</li>
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</ul>
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<p>These components are illustrated in the following diagram:</p>
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<img alt="_images/cordaNetwork.png" class="align-center" src="_images/cordaNetwork.png" />
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<p>Note:</p>
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<ul class="simple">
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<li>Corda infrastructure services are those which all participants depend upon, such as the network map and notaries.</li>
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<li>Corda services can be deployed by participants, third parties or a central network operator (eg. such as R3);
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this diagram is not intended to imply only a centralised model is supported</li>
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</ul>
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<p>It is important to highlight the following:</p>
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<ul class="simple">
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<li>Corda is designed for semi-private networks in which admission requires obtaining an identity signed by a root authority.</li>
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<li>Nodes are arranged in an authenticated peer to peer network. All communication is direct.</li>
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<li>Data is shared on a need-to-know basis. Nodes provide the dependency graph of a transaction they are sending to another node on demand, but there is no global broadcast of all transactions.</li>
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<li>Nodes are backed by a relational database and data placed in the ledger can be queried using SQL</li>
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<li>The network map publishes the IP addresses through which every node on the network can be reached, along with the identity certificates of those nodes and the services they provide.</li>
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<li>All communication takes the form of small multi-party sub-protocols called flows.</li>
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<li>Oracles represent gateways to proprietary (or other) business logic executors (e.g., central counterparties or valuation agents) that can be verified on-ledger by participants.</li>
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</ul>
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<div class="section" id="cordapps">
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<h2>CorDapps<a class="headerlink" href="#cordapps" title="Permalink to this headline">¶</a></h2>
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<p>Corda is a platform for the writing of “CorDapps”: applications that extend the distributed ledger with new capabilities.
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Such apps define new data types, new inter-node protocol flows and the “smart contracts” that determine allowed changes.
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The combination of state objects (data), contract code (allowable operations), transaction flows (business logic
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choreography), any necessary APIs, vault plugins, and UI components can be thought of as a shared ledger application,
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or corda distributed application (“CorDapp”). This is the core set of components a contract developer on the platform
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should expect to build.</p>
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<p>Examples of CorDapps include asset trading (see <a class="reference internal" href="running-the-demos.html#irs-demo"><span class="std std-ref">IRS demo</span></a> and <a class="reference internal" href="running-the-demos.html#trader-demo"><span class="std std-ref">Trader demo</span></a>), portfolio valuations (see <a class="reference internal" href="running-the-demos.html#simm-demo"><span class="std std-ref">SIMM and Portfolio Demo - aka the Initial Margin Agreement Demo</span></a>), trade finance,
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post-trade order matching, KYC/AML, etc.</p>
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