Artophage/pow.html at master · NeonGamerBot-QK/Artophage · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Proof of Work</title>
</head>
<body>
  <h1>Solving Proof of Work...</h1>
  <script>
    async function sha256(message) {
      const encoder = new TextEncoder();
      const data = encoder.encode(message);
      const hashBuffer = await crypto.subtle.digest('SHA-256', data);
      const hashArray = Array.from(new Uint8Array(hashBuffer));
      return hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
    }

    async function solvePoW(difficulty = 1) {
      const targetPrefix = '0'.repeat(difficulty);
      const baseData = 'PoW-' + Math.random().toString(36).slice(2);
      let nonce = 0;

      while (true) {
        const data = baseData + nonce;
        const hash = await sha256(data);

        if (hash.startsWith(targetPrefix)) {
          const message = `✅ Proof of Work Solved!\n\nNonce: ${nonce}\nHash: ${hash}`;
          alert(message);
          console.log(message);
          break;
        }

        nonce++;

        // Optional: prevent UI freeze every 10k tries
        if (nonce % 10000 === 0) await new Promise(r => setTimeout(r, 0));
      }
    }

    solvePoW(4); // Difficulty = 1 (very quick)
  </script>
</body>
</html>