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<div class="chapter" id="Smart-contract-interfaces">
<span id="Smart-contract-interfaces-1"></span><h2 class="chapter">1 Smart contract interfaces</h2>
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<ul class="section-toc">
<li><a href="#Smart-Contracts-in-the-CIC-Network" accesskey="1">Smart Contracts in the CIC Network</a></li>
</ul>
<div class="section" id="Smart-Contracts-in-the-CIC-Network">
<h3 class="section">1.1 Smart Contracts in the CIC Network</h3>
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<ul class="section-toc">
<li><a href="#Technology" accesskey="1">Technology</a></li>
<li><a href="#The-registry-contract" accesskey="2">The registry contract</a></li>
<li><a href="#Auxiliary-contracts" accesskey="3">Auxiliary contracts</a></li>
<li><a href="#Contract-interfaces" accesskey="4">Contract interfaces</a></li>
</ul>
<div class="subsection" id="Technology">
<h4 class="subsection">1.1.1 Technology</h4>
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<p>The long-term aim of the CIC network is to be agnostic of consensus engines. However, since we have to start <em>somewhere</em>, the current state of development only deals with Smart Contracts on the (Ethereum Virtual Machine (EVM).
</p>
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</div>
<div class="subsection" id="The-registry-contract">
<h4 class="subsection">1.1.2 The registry contract</h4>
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<p>The CICRegistry contract defines the entry-point to the entire CIC network. All other CIC network resources can be discovered through this contract.
</p>
<p>Its implementation is contained in the <samp>cic-registry</samp> repository. Details about it are documented further in that section.
</p>
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</div>
<div class="subsection" id="Auxiliary-contracts">
<h4 class="subsection">1.1.3 Auxiliary contracts</h4>
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<p>All other Smart Contracts in the network other than CICRegistry are essentially optional, and each applies <em>at least one</em> the interfaces defined in the <code>cic-contracts</code> repository.
</p>
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</div>
<div class="subsection" id="Contract-interfaces">
<h4 class="subsection">1.1.4 Contract interfaces</h4>
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<p>All contracts interfaces also implement the <strong>EIP165</strong> Standard Interface Detection.
</p>
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<ul class="section-toc">
<li><a href="#Registry" accesskey="1">Registry</a></li>
<li><a href="#Registry-Client" accesskey="2">Registry Client</a></li>
<li><a href="#Faucet" accesskey="3">Faucet</a></li>
<li><a href="#Transfer-approval" accesskey="4">Transfer approval</a></li>
<li><a href="#Declarator" accesskey="5">Declarator</a></li>
<li><a href="#Address-Index" accesskey="6">Address Index</a></li>
<li><a href="#DEX-Index" accesskey="7">DEX Index</a></li>
</ul>
<div class="subsubsection" id="Registry">
<h4 class="subsubsection">1.1.4.1 Registry</h4>
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<p>A key-value store, which resolves arbitrary 32-byte pointers to Ethereum addresses. Typically, this is used to resolve an address from a well-known identifier, either as a UTF-8 value or a 256-bit hash.
</p>
<p>It also provides numerical index access to all registered values in order of insertion.
</p>
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</div>
<div class="subsubsection" id="Registry-Client">
<h4 class="subsubsection">1.1.4.2 Registry Client</h4>
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<p>A subset of the <code>Registry</code> interface, which defines only the non-transactional methods of the contract. The <code>Registry Client</code> interface is implemented by the <code>CICRegistry</code> contract.
</p>
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</div>
<div class="subsubsection" id="Faucet">
<h4 class="subsubsection">1.1.4.3 Faucet</h4>
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<p>Enables disbursement of a set amount of tokens to a requesting address.
</p>
<p>Allows privileged accounts to adjust the amount of tokens to disburse.
</p>
<p>Can be implemented as a periodic or a one-time service per account.
</p>
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</div>
<div class="subsubsection" id="Transfer-approval">
<h4 class="subsubsection">1.1.4.4 Transfer approval</h4>
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<p>Enables a third-party approval to spend an ERC20 token allowance.
</p>
<p>This is useful in the case of a custodial key store, where a transaction has been initiated by another entity than the owner of the key.
</p>
<p>The contract allows the third-party address to either allow or reject the transfer.
</p>
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</div>
<div class="subsubsection" id="Declarator">
<h4 class="subsubsection">1.1.4.5 Declarator</h4>
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<p>Stores one or more 32-byte entries as a description of an Ethereum address, <em>signed</em> by another Ethereum address.
</p>
<p>This can be used to <em>describe</em> network resources, be it tokens, contracts or user accounts. Examples of uses are KYC documentation proofs for users, token metadata used for display, or fraud alerts.
</p>
<p>Entries are stored by the transacting address that adds address/description pairs. In other words, any address may have different &quot;opinions&quot; registered about it, depending on which signing address it is queried in the context of. This, in turn, allows the quering entity to compile its own &quot;opinion&quot; of an address by combining data from signatures it trusts.
</p>
<p>Entries typically are text strings or content hashes.
</p>
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</div>
<div class="subsubsection" id="Address-Index">
<h4 class="subsubsection">1.1.4.6 Address Index</h4>
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<p>A simple append-only list of addresses. Used to check whether an address is part of a particular group.
</p>
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</div>
<div class="subsubsection" id="DEX-Index">
<h4 class="subsubsection">1.1.4.7 DEX Index</h4>
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<p>Methods required to convert between tokens.
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