second commit

app.py

@@ -0,0 +1,41 @@
+import hashlib
+import os
+from flask import Flask, request, render_template, redirect
+
+app = Flask(__name__)
+
+# Global storage for the current challenge
+current_challenge = {}
+
+# Redirect root URL to get-challenge
+@app.route('/', methods=['GET'])
+def index():
+    return redirect('/get-challenge')  # Redirect to the challenge page
+
+# Generate a nonce and difficulty for the client
+@app.route('/get-challenge', methods=['GET'])
+def get_challenge():
+    global current_challenge
+    nonce = os.urandom(16).hex()  # Generate a random 16-byte nonce
+    difficulty = 4  # Set the difficulty (number of leading zeros)
+    current_challenge = {'nonce': nonce, 'difficulty': difficulty}
+    return render_template('challenge.html', nonce=nonce, difficulty=difficulty)
+
+# Verify the solution provided by the client
+@app.route('/verify', methods=['POST'])
+def verify_solution():
+    solution = request.form['solution']
+    nonce = current_challenge['nonce']
+    difficulty = current_challenge['difficulty']
+
+    # Recompute the hash with the client's solution
+    hash_result = hashlib.sha256((nonce + solution).encode()).hexdigest()
+
+    # Check if the hash has the required number of leading zeros
+    if hash_result.startswith('0' * difficulty):
+        return render_template('result.html', status="Success! Solution is correct.")
+    else:
+        return render_template('result.html', status="Failed. Incorrect solution.")
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=6969)

nohup.out

@@ -0,0 +1,11 @@
+ * Serving Flask app 'app'
+ * Debug mode: off
+WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
+ * Running on all addresses (0.0.0.0)
+ * Running on http://127.0.0.1:6969
+ * Running on http://87.120.112.23:6969
+Press CTRL+C to quit
+172.58.127.76 - - [22/Oct/2024 15:40:16] "GET / HTTP/1.1" 200 -
+172.58.127.76 - - [22/Oct/2024 15:40:16] "GET /static/main.js HTTP/1.1" 200 -
+172.58.127.76 - - [22/Oct/2024 15:40:17] "GET /favicon.ico HTTP/1.1" 404 -
+172.58.127.76 - - [22/Oct/2024 15:40:18] "GET /get-challenge HTTP/1.1" 200 -

solve.py

@@ -0,0 +1,16 @@
+import hashlib
+
+# Get user inputs for nonce and difficulty
+nonce = input("Enter the nonce: ")
+difficulty = int(input("Enter the difficulty (number of leading zeros): "))
+
+def sha256(message):
+    return hashlib.sha256(message.encode()).hexdigest()
+
+solution = 0
+while True:
+    hash_result = sha256(nonce + str(solution))
+    if hash_result.startswith('0' * difficulty):
+        print("Solution found:", solution)
+        break
+    solution += 1

static/main.js

@@ -0,0 +1,47 @@
+async function sha256(message) {
+    const msgBuffer = new TextEncoder().encode(message);
+    const hashBuffer = await crypto.subtle.digest('SHA-256', msgBuffer);
+    const hashArray = Array.from(new Uint8Array(hashBuffer));
+    const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
+    return hashHex;
+}
+
+async function startPoW() {
+    document.getElementById('status').innerText = "Starting PoW...";
+
+    // Fetch challenge from the server
+    const response = await fetch('/get-challenge');
+    const challenge = await response.json();
+    const { nonce, difficulty } = challenge;
+
+    let solution = 0;
+    let hash = '';
+
+    // Brute-force to find a solution
+    while (true) {
+        hash = await sha256(nonce + solution);
+        if (hash.startsWith('0'.repeat(difficulty))) {
+            break;
+        }
+        solution++;
+    }
+
+    document.getElementById('status').innerText = `Solution found: ${solution} (Hash: ${hash})`;
+
+    // Send the solution back to the server for verification
+    const verifyResponse = await fetch('/verify', {
+        method: 'POST',
+        headers: {
+            'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({ nonce, solution: solution.toString(), difficulty })
+    });
+
+    if (verifyResponse.status === 200) {
+        document.getElementById('status').innerText += " - Verified!";
+    } else {
+        document.getElementById('status').innerText += " - Verification failed!";
+    }
+}
+
+document.getElementById('start-pow').addEventListener('click', startPoW);

static/styles.css

@@ -0,0 +1,77 @@
+body {
+    font-family: 'Courier New', Courier, monospace;
+    background-color: #1e1e1e; /* Dark background for a circuit board feel */
+    color: #c9c9c9; /* Light text color */
+    margin: 0;
+    padding: 20px;
+}
+
+.container {
+    background: #2e2e2e; /* Darker box background */
+    border-radius: 10px;
+    padding: 20px;
+    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
+    max-width: 600px; /* Limit width for better appearance */
+    margin: auto; /* Center the container */
+}
+
+h1, h2 {
+    color: #4CAF50; /* Green text for headers */
+}
+
+h1 {
+    border-bottom: 2px solid #4CAF50; /* Underline for h1 */
+    padding-bottom: 10px;
+}
+
+h2 {
+    margin-top: 20px;
+}
+
+form {
+    margin-top: 20px;
+}
+
+input[type="text"] {
+    padding: 10px;
+    margin-top: 10px;
+    width: 100%; /* Full width for input */
+    border: 1px solid #4CAF50; /* Green border */
+    border-radius: 4px;
+    background-color: #333; /* Darker input field */
+    color: #c9c9c9; /* Light text color */
+}
+
+button {
+    padding: 10px 15px;
+    background-color: #4CAF50; /* Green button */
+    color: white;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+    transition: background-color 0.3s; /* Smooth hover transition */
+}
+
+button:hover {
+    background-color: #45a049; /* Darker green on hover */
+}
+
+a {
+    display: inline-block;
+    margin-top: 20px;
+    text-decoration: none;
+    color: #4CAF50; /* Green for links */
+}
+
+a:hover {
+    text-decoration: underline; /* Underline links on hover */
+}
+
+.code-box {
+    background-color: #2e2e2e; /* Dark background for code boxes */
+    border: 1px solid #4CAF50; /* Green border for code boxes */
+    border-radius: 5px;
+    padding: 10px;
+    overflow-x: auto; /* Allow horizontal scrolling */
+    font-family: 'Courier New', Courier, monospace; /* Monospace font for code */
+}

templates/challenge.html

@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Proof of Work Challenge</title>
+    <link rel="stylesheet" href="{{ url_for('static', filename='styles.css') }}">
+</head>
+<body>
+    <div class="container">
+        <h1>Proof of Work Challenge</h1>
+        <p><strong>Nonce:</strong> {{ nonce }}</p>
+        <p><strong>Difficulty:</strong> {{ difficulty }}</p>
+        
+        <h2>Instructions</h2>
+        <p>To solve the Proof of Work challenge, run the following Python script locally with the provided nonce:</p>
+        <div class="code-box">
+<pre>
+import hashlib
+
+nonce = "{{ nonce }}"
+difficulty = {{ difficulty }}
+
+def sha256(message):
+    return hashlib.sha256(message.encode()).hexdigest()
+
+solution = 0
+while True:
+    hash_result = sha256(nonce + str(solution))
+    if hash_result.startswith('0' * difficulty):
+        print("Solution found:", solution)
+        break
+    solution += 1
+</pre>
+        </div>
+
+        <p>Once you've found the solution, enter it below:</p>
+
+        <form action="/verify" method="post">
+            <label for="solution">Solution:</label>
+            <input type="text" id="solution" name="solution" required>
+            <button type="submit">Verify</button>
+        </form>
+    </div>
+</body>
+</html>

templates/result.html

@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Verification Result</title>
+    <link rel="stylesheet" href="{{ url_for('static', filename='styles.css') }}">
+</head>
+<body>
+    <div class="container">
+        <h1>Verification Result</h1>
+        <p>{{ status }}</p>
+
+        <a href="/get-challenge">Try Another Challenge</a>
+    </div>
+</body>
+</html>