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<a href="#pub-methods">Public Member Functions</a> &#124;
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<p><code>#include &lt;<a class="el" href="merkleblock_8h_source.html">merkleblock.h</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a44903b156e6c77f3ef977324b24daf1f"><td class="memTemplParams" colspan="2">template&lt;typename Stream , typename Operation &gt; </td></tr>
<tr class="memitem:a44903b156e6c77f3ef977324b24daf1f"><td class="memTemplItemLeft" align="right" valign="top">void&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#a44903b156e6c77f3ef977324b24daf1f">SerializationOp</a> (Stream &amp;s, Operation ser_action, int nType, int nVersion)</td></tr>
<tr class="separator:a44903b156e6c77f3ef977324b24daf1f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a0656767dc0d8f3d603c54e5be21d3890"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#a0656767dc0d8f3d603c54e5be21d3890">CPartialMerkleTree</a> (const std::vector&lt; <a class="el" href="classuint256.html">uint256</a> &gt; &amp;vTxid, const std::vector&lt; bool &gt; &amp;vMatch)</td></tr>
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<tr class="memitem:aad4948ace869c92614310846f9d9980d"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#aad4948ace869c92614310846f9d9980d">CPartialMerkleTree</a> ()</td></tr>
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<tr class="memitem:a28c3456d1159b33b6c2689ac88eb56ad"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classuint256.html">uint256</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#a28c3456d1159b33b6c2689ac88eb56ad">ExtractMatches</a> (std::vector&lt; <a class="el" href="classuint256.html">uint256</a> &gt; &amp;vMatch)</td></tr>
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Public Attributes</h2></td></tr>
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Protected Member Functions</h2></td></tr>
<tr class="memitem:a7dd0288d62321fb5aa2c27a3372ee8fe"><td class="memItemLeft" align="right" valign="top">unsigned int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#a7dd0288d62321fb5aa2c27a3372ee8fe">CalcTreeWidth</a> (int height)</td></tr>
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<tr class="memitem:a69e7771f95c498f6a340dcc227abcde4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classuint256.html">uint256</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#a69e7771f95c498f6a340dcc227abcde4">CalcHash</a> (int height, unsigned int pos, const std::vector&lt; <a class="el" href="classuint256.html">uint256</a> &gt; &amp;vTxid)</td></tr>
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<tr class="memitem:a62bdcaf5b5ee6c6327ef67fb027a5fef"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#a62bdcaf5b5ee6c6327ef67fb027a5fef">TraverseAndBuild</a> (int height, unsigned int pos, const std::vector&lt; <a class="el" href="classuint256.html">uint256</a> &gt; &amp;vTxid, const std::vector&lt; bool &gt; &amp;vMatch)</td></tr>
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<tr class="memitem:a3ddbe75a92d93059c30f6e60bacc7054"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classuint256.html">uint256</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#a3ddbe75a92d93059c30f6e60bacc7054">TraverseAndExtract</a> (int height, unsigned int pos, unsigned int &amp;nBitsUsed, unsigned int &amp;nHashUsed, std::vector&lt; <a class="el" href="classuint256.html">uint256</a> &gt; &amp;vMatch)</td></tr>
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Protected Attributes</h2></td></tr>
<tr class="memitem:a0d3bd530f19f2c75c140a05c6f99782a"><td class="memItemLeft" align="right" valign="top">unsigned int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#a0d3bd530f19f2c75c140a05c6f99782a">nTransactions</a></td></tr>
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<tr class="memitem:a22a522d1fb8d449f4c91b65283339e7d"><td class="memItemLeft" align="right" valign="top">std::vector&lt; bool &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#a22a522d1fb8d449f4c91b65283339e7d">vBits</a></td></tr>
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<tr class="memitem:a863cf9024be1b8fa97db08dfd6dbd687"><td class="memItemLeft" align="right" valign="top">std::vector&lt; <a class="el" href="classuint256.html">uint256</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#a863cf9024be1b8fa97db08dfd6dbd687">vHash</a></td></tr>
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<tr class="memitem:a24bb0d9d17d6001dcfbca4d550c64ba3"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCPartialMerkleTree.html#a24bb0d9d17d6001dcfbca4d550c64ba3">fBad</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Data structure that represents a partial merkle tree.</p>
<p>It represents a subset of the txid's of a known block, in a way that allows recovery of the list of txid's and the merkle root, in an authenticated way.</p>
<p>The encoding works as follows: we traverse the tree in depth-first order, storing a bit for each traversed node, signifying whether the node is the parent of at least one matched leaf txid (or a matched txid itself). In case we are at the leaf level, or this bit is 0, its merkle node hash is stored, and its children are not explorer further. Otherwise, no hash is stored, but we recurse into both (or the only) child branch. During decoding, the same depth-first traversal is performed, consuming bits and hashes as they written during encoding.</p>
<p>The serialization is fixed and provides a hard guarantee about the encoded size:</p>
<p>SIZE &lt;= 10 + ceil(32.25*N)</p>
<p>Where N represents the number of leaf nodes of the partial tree. N itself is bounded by:</p>
<p>N &lt;= total_transactions N &lt;= 1 + matched_transactions*tree_height</p>
<p>The serialization format:</p><ul>
<li>uint32 total_transactions (4 bytes)</li>
<li>varint number of hashes (1-3 bytes)</li>
<li><a class="el" href="classuint256.html">uint256</a>[] hashes in depth-first order (&lt;= 32*N bytes)</li>
<li>varint number of bytes of flag bits (1-3 bytes)</li>
<li>byte[] flag bits, packed per 8 in a byte, least significant bit first (&lt;= 2*N-1 bits) The size constraints follow from this. </li>
</ul>
<p class="definition">Definition at line <a class="el" href="merkleblock_8h_source.html#l00050">50</a> of file <a class="el" href="merkleblock_8h_source.html">merkleblock.h</a>.</p>
</div><h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
<a id="a0656767dc0d8f3d603c54e5be21d3890"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a0656767dc0d8f3d603c54e5be21d3890">&#9670;&nbsp;</a></span>CPartialMerkleTree() <span class="overload">[1/2]</span></h2>
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<td class="paramtype">const std::vector&lt; <a class="el" href="classuint256.html">uint256</a> &gt; &amp;&#160;</td>
<td class="paramname"><em>vTxid</em>, </td>
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<p>Construct a partial merkle tree from a list of transaction ids, and a mask that selects a subset of them </p>
<p class="definition">Definition at line <a class="el" href="merkleblock_8cpp_source.html#l00134">134</a> of file <a class="el" href="merkleblock_8cpp_source.html">merkleblock.cpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aad4948ace869c92614310846f9d9980d">&#9670;&nbsp;</a></span>CPartialMerkleTree() <span class="overload">[2/2]</span></h2>
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<td class="memname">CPartialMerkleTree::CPartialMerkleTree </td>
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<p class="definition">Definition at line <a class="el" href="merkleblock_8cpp_source.html#l00148">148</a> of file <a class="el" href="merkleblock_8cpp_source.html">merkleblock.cpp</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
<a id="a69e7771f95c498f6a340dcc227abcde4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a69e7771f95c498f6a340dcc227abcde4">&#9670;&nbsp;</a></span>CalcHash()</h2>
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<td class="memname"><a class="el" href="classuint256.html">uint256</a> CPartialMerkleTree::CalcHash </td>
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<td class="paramtype">unsigned int&#160;</td>
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<td class="paramtype">const std::vector&lt; <a class="el" href="classuint256.html">uint256</a> &gt; &amp;&#160;</td>
<td class="paramname"><em>vTxid</em>&#160;</td>
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<p>calculate the hash of a node in the merkle tree (at leaf level: the txid's themselves) </p>
<p class="definition">Definition at line <a class="el" href="merkleblock_8cpp_source.html#l00063">63</a> of file <a class="el" href="merkleblock_8cpp_source.html">merkleblock.cpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a7dd0288d62321fb5aa2c27a3372ee8fe">&#9670;&nbsp;</a></span>CalcTreeWidth()</h2>
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<td class="memname">unsigned int CPartialMerkleTree::CalcTreeWidth </td>
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<p>helper function to efficiently calculate the number of nodes at given height in the merkle tree </p>
<p class="definition">Definition at line <a class="el" href="merkleblock_8h_source.html#l00066">66</a> of file <a class="el" href="merkleblock_8h_source.html">merkleblock.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="merkleblock_8cpp_source.html#l00134">CPartialMerkleTree()</a>, and <a class="el" href="merkleblock_8cpp_source.html#l00150">ExtractMatches()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a28c3456d1159b33b6c2689ac88eb56ad">&#9670;&nbsp;</a></span>ExtractMatches()</h2>
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<td class="memname"><a class="el" href="classuint256.html">uint256</a> CPartialMerkleTree::ExtractMatches </td>
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<p>extract the matching txid's represented by this partial merkle tree. returns the merkle root, or 0 in case of failure </p>
<p class="definition">Definition at line <a class="el" href="merkleblock_8cpp_source.html#l00150">150</a> of file <a class="el" href="merkleblock_8cpp_source.html">merkleblock.cpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a44903b156e6c77f3ef977324b24daf1f">&#9670;&nbsp;</a></span>SerializationOp()</h2>
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template&lt;typename Stream , typename Operation &gt; </div>
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<td class="memname">void CPartialMerkleTree::SerializationOp </td>
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<p class="definition">Definition at line <a class="el" href="merkleblock_8h_source.html#l00088">88</a> of file <a class="el" href="merkleblock_8h_source.html">merkleblock.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a62bdcaf5b5ee6c6327ef67fb027a5fef">&#9670;&nbsp;</a></span>TraverseAndBuild()</h2>
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<td class="memname">void CPartialMerkleTree::TraverseAndBuild </td>
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<p>recursive function that traverses tree nodes, storing the data as bits and hashes </p>
<p class="definition">Definition at line <a class="el" href="merkleblock_8cpp_source.html#l00080">80</a> of file <a class="el" href="merkleblock_8cpp_source.html">merkleblock.cpp</a>.</p>
<p class="reference">Referenced by <a class="el" href="merkleblock_8cpp_source.html#l00134">CPartialMerkleTree()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a3ddbe75a92d93059c30f6e60bacc7054">&#9670;&nbsp;</a></span>TraverseAndExtract()</h2>
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<p>recursive function that traverses tree nodes, consuming the bits and hashes produced by TraverseAndBuild. it returns the hash of the respective node. </p>
<p class="definition">Definition at line <a class="el" href="merkleblock_8cpp_source.html#l00098">98</a> of file <a class="el" href="merkleblock_8cpp_source.html">merkleblock.cpp</a>.</p>
<p class="reference">Referenced by <a class="el" href="merkleblock_8cpp_source.html#l00150">ExtractMatches()</a>.</p>
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<h2 class="groupheader">Member Data Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ae218db8103edb6672fe0d642535c7490">&#9670;&nbsp;</a></span>ADD_SERIALIZE_METHODS</h2>
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<p>serialization implementation </p>
<p class="definition">Definition at line <a class="el" href="merkleblock_8h_source.html#l00085">85</a> of file <a class="el" href="merkleblock_8h_source.html">merkleblock.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a24bb0d9d17d6001dcfbca4d550c64ba3">&#9670;&nbsp;</a></span>fBad</h2>
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<td class="memname">bool CPartialMerkleTree::fBad</td>
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<p>flag set when encountering invalid data </p>
<p class="definition">Definition at line <a class="el" href="merkleblock_8h_source.html#l00063">63</a> of file <a class="el" href="merkleblock_8h_source.html">merkleblock.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="merkleblock_8cpp_source.html#l00150">ExtractMatches()</a>, and <a class="el" href="merkleblock_8h_source.html#l00088">SerializationOp()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a0d3bd530f19f2c75c140a05c6f99782a">&#9670;&nbsp;</a></span>nTransactions</h2>
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<td class="memname">unsigned int CPartialMerkleTree::nTransactions</td>
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<p>the total number of transactions in the block </p>
<p class="definition">Definition at line <a class="el" href="merkleblock_8h_source.html#l00054">54</a> of file <a class="el" href="merkleblock_8h_source.html">merkleblock.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="merkleblock_8h_source.html#l00066">CalcTreeWidth()</a>, <a class="el" href="merkleblock_8cpp_source.html#l00150">ExtractMatches()</a>, and <a class="el" href="merkleblock_8h_source.html#l00088">SerializationOp()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a22a522d1fb8d449f4c91b65283339e7d">&#9670;&nbsp;</a></span>vBits</h2>
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<td class="memname">std::vector&lt;bool&gt; CPartialMerkleTree::vBits</td>
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<p>node-is-parent-of-matched-txid bits </p>
<p class="definition">Definition at line <a class="el" href="merkleblock_8h_source.html#l00057">57</a> of file <a class="el" href="merkleblock_8h_source.html">merkleblock.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="merkleblock_8cpp_source.html#l00134">CPartialMerkleTree()</a>, <a class="el" href="merkleblock_8cpp_source.html#l00150">ExtractMatches()</a>, and <a class="el" href="merkleblock_8h_source.html#l00088">SerializationOp()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a863cf9024be1b8fa97db08dfd6dbd687">&#9670;&nbsp;</a></span>vHash</h2>
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<td class="memname">std::vector&lt;<a class="el" href="classuint256.html">uint256</a>&gt; CPartialMerkleTree::vHash</td>
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<p>txids and internal hashes </p>
<p class="definition">Definition at line <a class="el" href="merkleblock_8h_source.html#l00060">60</a> of file <a class="el" href="merkleblock_8h_source.html">merkleblock.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="merkleblock_8cpp_source.html#l00134">CPartialMerkleTree()</a>, <a class="el" href="merkleblock_8cpp_source.html#l00150">ExtractMatches()</a>, and <a class="el" href="merkleblock_8h_source.html#l00088">SerializationOp()</a>.</p>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li>src/<a class="el" href="merkleblock_8h_source.html">merkleblock.h</a></li>
<li>src/<a class="el" href="merkleblock_8cpp_source.html">merkleblock.cpp</a></li>
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