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<time datetime="2019-03-19T11:46:24.000Z" itemprop="datePublished">2019-03-19</time>
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How to Upload Big Files
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<h3 id="Background"><a href="#Background" class="headerlink" title="Background"></a>Background</h3><p>Sometimes we need to upload files much bigger than 100KB.</p>
<p>In this situation, we need to chunk it up to many chunks.</p>
<p>However, due to the 25 tx limit, if we upload them one by one, it will takes a lot of time.</p>
<p>A better upload method is recommended.</p>
<h3 id="Upload-Method"><a href="#Upload-Method" class="headerlink" title="Upload Method"></a>Upload Method</h3><p>Input:</p>
<ol>
<li>private key</li>
<li>files</li>
</ol>
<p>Logic:</p>
<ol>
<li><p>acquire utxos</p>
</li>
<li><p>read files as chunks</p>
</li>
<li><p>generate chunk key by privkey.childKey(chunkâs md5)</p>
</li>
<li><p>build a master tx from utxo, the tx has</p>
<p>inputs from utxos</p>
<p>outputs for each file chunk with adequate satoshis</p>
<p>change output</p>
</li>
<li><p>build chunk tx, which has only 1 data output.</p>
</li>
<li>broadcast them all</li>
</ol>
<p>If you reach the 25 tx limits, just wait for the confirmation of master tx, then all chunk tx will be accepted.</p>
<p>BTW, you can build and broadcast master tx by moneybutton actually.<br>Then, handle the chunk txs.</p>
<h3 id="Examples"><a href="#Examples" class="headerlink" title="Examples"></a>Examples</h3><p>Master transaction example:<br> <a href="https://bchsvexplorer.com/tx/3937d759f4a31e1b5eee2e7c192f289f39199ce9b7913bee712bbc9510a511ea" target="_blank" rel="noopener">https://bchsvexplorer.com/tx/3937d759f4a31e1b5eee2e7c192f289f39199ce9b7913bee712bbc9510a511ea</a><br>chunk transaction example(1 in 1 out):<br> <a href="https://bchsvexplorer.com/tx/73192bb6bf6dec79d359e49b9b41355ad83ffec3adbbaf27b71a0ac4668d31d4" target="_blank" rel="noopener">https://bchsvexplorer.com/tx/73192bb6bf6dec79d359e49b9b41355ad83ffec3adbbaf27b71a0ac4668d31d4</a></p>
<p>Some code example:</p>
<p> <a href="https://github.com/monkeylord/MetaSite-Hammer" target="_blank" rel="noopener">https://github.com/monkeylord/MetaSite-Hammer</a></p>
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