<!DOCTYPE html>
<!--
SPDX-License-Identifier: BSD-2-Clause
SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
-->
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Proof-of-work challenge</title>
<link rel="stylesheet" href="/.powxy/static/style.css" />
</head>
<body data-identifier="{{ .Identifier }}" data-difficulty="{{ .Global.NeedBits }}">
<main>
<header>
<h1>Proof-of-work challenge</h1>
</header>
<section>
<p>This site is protected by <a href="{{ .Global.SourceURL }}">Powxy</a>{{ if .Global.Version }} {{ .Global.Version }}{{ end }}.</p>
<p>You must complete this proof-of-work challenge before you can access this site.</p>
</section>
<section>
<p>Find an nonce that, when appended to the following string, results in a SHA-256 hash that begins with at least {{ .Global.NeedBits }} zero bits.</p>
<pre id="identifier">{{ .Identifier }}</pre>
</section>
<section>
<form method="POST">
<label for="nonce">Your selected nonce, base64-encoded:</label>
<input id="nonce" name="powxy" type="text" />
<input type="submit" value="Submit" />
<p>Please note that if your submission is successful, you will be given a cookie that will allow you to access this site for a period of time without having to complete the challenge again. By pressing the submit button, you agree to be given cookies for this purpose.</p>
</form>
</section>
{{- if .Message }}
<section>
<p><strong>{{ .Message }}</strong></p>
</section>
{{- end }}
<section>
<p class="somewhat-transparent" id="solver_status">JavaScript seems to be disabled. You must solve the challenge externally.</p>
</section>
<section>
<p class="somewhat-transparent"><a href="/.powxy/static/solver.c">A C implementation of the challenge solver</a> is available.</p>
</section>
</main>
<script src="/.powxy/static/main.js">
</script>
</body>
</html>