Add legally-binding
notarization in 3 lines of code.

Quickstart

From zero to your first sealed document in under five minutes.

1. 1Get a publishable key

   Head to Manage Keys and create a new key (test or live). Lock it to your domains with the allowed-origins list.

2. 2Drop the SDK on your page

   htmlCopy

   <!-- NotaryChain SDK · drop anywhere on your site -->
   <script src="https://acn-oracle-live.emergent.host/api/sdk/v1/notarychain.js"></script>
   <script>
     NotaryChain.init({ publishableKey: 'pk_live_YOUR_KEY' });
   
     document.getElementById('notarize-btn').addEventListener('click', () => {
       NotaryChain.startCeremony({
         documentName: 'Power of Attorney',
         documentType: 'power_of_attorney',
         signerEmail: 'jane@example.com',
         signerName: 'Jane Doe',
         metadata: { order_id: '12345' }
       });
     });
   
     NotaryChain.on('sealed', (data) => {
       console.log('Sealed:', data.seal_hash, data.hcs_tx);
     });
   </script>
   
   <button id="notarize-btn">Notarize this document</button>

3. 3Or use it from React

   jsxCopy

   import { useEffect } from 'react';
   
   export function NotarizeButton({ document }) {
     useEffect(() => {
       if (!document.querySelector('script[data-nc-sdk]')) {
         const s = document.createElement('script');
         s.src = 'https://acn-oracle-live.emergent.host/api/sdk/v1/notarychain.js';
         s.setAttribute('data-nc-sdk', '1');
         document.head.appendChild(s);
         s.onload = () => window.NotaryChain.init({
           publishableKey: process.env.REACT_APP_NC_KEY
         });
       }
     }, []);
   
     const start = () => {
       window.NotaryChain.startCeremony({
         documentName: document.name,
         documentType: 'contract',
         signerEmail: document.signer.email,
         metadata: { doc_id: document.id }
       });
       window.NotaryChain.on('sealed', (d) => onComplete(d));
     };
   
     return <button onClick={start}>Notarize</button>;
   }

4. 4Verify completions server-side via webhooks

   javascriptCopy

   // Express.js example — verify NotaryChain webhook signature
   import crypto from 'crypto';
   
   app.post('/webhooks/notarychain', express.raw({ type: 'application/json' }), (req, res) => {
     const signature = req.headers['x-notarychain-signature'];
     const secret = process.env.NC_WEBHOOK_SECRET;
   
     const expected = 'sha256=' + crypto
       .createHmac('sha256', secret)
       .update(JSON.stringify(JSON.parse(req.body), Object.keys(JSON.parse(req.body)).sort()))
       .digest('hex');
   
     if (signature !== expected) return res.status(401).send('Invalid signature');
   
     const event = JSON.parse(req.body);
     switch (event.type) {
       case 'ceremony.sealed':
         console.log('Sealed:', event.data.seal_hash, event.data.hcs_tx);
         // Update your DB: mark document as notarized
         break;
       case 'ceremony.completed':
         console.log('Completed:', event.data.session_token);
         break;
     }
     res.json({ received: true });
   });

Why teams use the SDK