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<html>

  <head>
    <meta charset="UTF-8"/>
    <meta name="author" content="Trey Del Bonis"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>

    <title>Bitcoin Halving Countdown</title>
    <script src="main.js"></script>
    <link rel="stylesheet" type="text/css" href="style.css"/>
  </head>

  <body onload="init();">

    <div id="content">
      <div id="heading">
        <h1>Bitcoin Block Halving Countdown!</h1>
        <h3><span id="blocksleft">...</span> blocks left</h3>
        <h3><span id="timeleft">... remaining</span></h3>
        <h3 id="halftimectr"><span id="halftime">ETA ...</span></h3>
        <p>
          Click/tap on the rows for more statistics - <a href="#faq">FAQ</a>
        </p>
      </div>

      <div id="blocklist">
        <span id="blocklistloading">Loading blocks...</span>
      </div>

    </div>

    <hr/>

    <div id="faq">
      <h2 style="text-align: center;">Halving FAQ</h2>

      <p>
        <b>Q:</b> What's a halving?  Does that mean I'll have twice/half as many coins?
      </p>
      <p>
        <b>A:</b> No, a reward halving is when the fixed subsidy for miners gets
        cut in half.  This has happened twice before, and will happen many more
        times until all bitcoins have been mined (21 million).
      </p>

      <p>
        <b>Q:</b> Who decides when halvings happen?  Can this be stopped?
      </p>
      <p>
        <b>A:</b> Satoshi embedded the halving algorithm into the consensus protocol of
        the Bitcoin network.  It can only be changed if every user of the
        network decided to change it as part of a hard fork.  One of Bitcoin's
        core offerings is its fixed and unchangable monetary policy, so it's
        <em>exceedingly unlikely</em> that it is going to be changed.
        <br/><br/>
        The reward function (in Bitcoins) is
        <code>r(h) = 50 / (2 ** floor(h / 210000))</code>, where h is block height.
      </p>

      <p>
        <b>Q:</b> I noticed some of your measurments here are different than those on
        other countdown clocks.  Why is that?
      </p>
      <p>
        <b>A:</b> Since mining is a probabilistic process, it's impossible to predict
        when new blocks will be mined.  <em>On average</em>, new blocks are
        mined every 10 minutes, but this can vary a lot.  So it's hard to
        predict <em>exactly</em> when block number 630000 will be mined, but all
        answers will converge when the time comes.  Since everyone does the math
        slightly differently we all get slightly different answers.
      </p>
      <p>
        <b>Update:</b> I've been noticing the hashrate seems to be a lot higher
        than usual.  I wrote a modified block halving ETA algorithm that bases
        block times on the average of the recent blocks, but I won't display it
        directly as might give too misleading predictions, or my code might be
        wrong.  You can check its answer below:
        <br/>
        <button onclick="updateFancyPrediction();">Check adjusted ETA</button>
        <i><span id="fancyprediction"></span></i>
      </p>

      <p>
        <b>Q:</b> Can I use this event to make money?
      </p>
      <p>
        <b>A:</b> Probably not.  But it's been observed that crypto bull markets have
        happened in the (roughly) year after each of the previous two halvings,
        so take that how you will.
      </p>

      <p>
        <b>Q:</b> Bull markets?  Does that mean I should buy Bitcoin?
      </p>
      <p>
        <b>A:</b> That's up to you.  I'm not your financial advisor.  Don't invest what
        you can't afford to lose.
        <!-- But also, buy Bitcoin! -->
      </p>

      <p>
        <b>Q:</b> I have another question for you
      </p>
      <p>
        <b>A:</b> I can be contacted at the following addresses...
        <ul>
          <li>Matrix: @trey:foobar.style</li>
          <li>IRC on Freenode: treyzania</li>
          <li>Briar: <a href="briar://ac22od43vo66zsclxawfcd63ltweyfbfbqgk2w67vswpxshuwckr6">briar://ac22od43vo66zsclxawfcd63ltweyfbfbqgk2w67vswpxshuwckr6</a></li>
        </ul>
    </div>

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    <div id="footer">
      Made by <a href="https://tr3y.io">Trey</a> - <a href="https://code.tr3y.io/treyzania/minihalf">Source</a>
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