giveaway/provability.html at main · 4G0R4/giveaway · GitHub

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<head>
  <title>SN Giveaway Picker</title>
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  <main class="container pt-5 mb-5">
    <a href="https://stacker.news/r/AGORA" target="_blank"><img src="sn-logo.png" width="339" height="70"></a>
    <h1 class=" pb-2 mb-4 text-dark border-dark">Giveaway Picker</h1>
    <article class="mt-5">
      <h2 class="h4 pb-2 mb-4 text-dark border-dark">Verify Provability</h2>
      <p>
        As the <code>blockhash</code> is just a number, its last 6 digits is converted to <code>decimal</code> using
        this function:</p>

      <code class="text-primary">var decimal =  parseInt(blockhash.slice(-6), 16);</code>
      <p></p>
      <p>Now we have an integer (0 to 16777215) from the <code>blockhash</code>.</p>

      <p>After dividing this <code>decimal</code> by the number of participants, we use the <i>modulo operator
          (<code>%</code>)</i>
        to get the division remainder becomes
        the <code>index_number</code>.</p>

      <p>This <code>index_number</code> is applied in the participants list, to get the position of the winner.</p>

      <code class="text-primary">
          var index_number = decimal % participants.length;</code>
      <br />
      <code class="text-primary">
          var winner = participants[index_number];
        </code>

      <p></p>

      <p>For additional winners, the past winners are removed from the list and one more digit is added from the
        blockhash. A maximum 210 was added to avoid working with big numbers.</p>

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          <p><small><a href="https://github.com/4G0R4/giveaway" target="_blank" rel="noreferrer">Source code</a><br/>
      blockchain data from <a href="https://mempool.space" target="_blank" rel="noreferrer">mempool.space</a></small></p>
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