import { createHash } from 'node:crypto';

const API_KEY = "cp_live_YOUR_API_KEY";
const BASE_URL = "https://api.chainproof.com";

async function anchorBuffer(buffer) {
  // 1. Hash the document with SHA-256
  const hash = createHash('sha256').update(buffer).digest('hex');

  // 2. Send the hash to ChainProof
  const res = await fetch(`${BASE_URL}/api/anchor`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${API_KEY}`,
    },
    body: JSON.stringify({ hash }),
  });
  if (!res.ok) throw new Error(`Anchoring failed: ${res.status}`);
  return res.json(); // {success, txHash, anchorId}
}

// Anchor a document automatically after generation
const invoice = fs.readFileSync('./invoice_123.pdf');
anchorBuffer(invoice).then(console.log);