Notarization

Learn how Aqua Protocol enables secure document notarization and verification

Notarization

Aqua Protocol provides a foundational framework for building distributed trust networks through secure notarization and verification systems.

What is Notarization?

Notarization in Aqua Protocol refers to the process of creating an immutable, cryptographically secured record of data existence and integrity. This process ensures that:

• Data integrity is maintained through cryptographic hashing
• Timestamp verification provides proof of when data was notarized
• Immutable records are stored on the blockchain for permanent verification
• Decentralized trust eliminates reliance on centralized authorities

How Aqua Notarization Works

1. Content Hashing

The first step in notarization involves creating a cryptographic hash of the content:

import { AquaClient } from '@aqua-protocol/sdk';
import crypto from 'crypto';

const client = new AquaClient({
  apiKey: process.env.AQUA_API_KEY,
  endpoint: 'https://api.aqua-protocol.org/v3'
});

// Create content hash
const content = 'Document content to be notarized';
const contentHash = crypto.createHash('sha256')
  .update(content)
  .digest('hex');

2. Revision Creation

Create a file revision to notarize the content:

const notarization = await client.createNotarization({
  content: content,
  fileHash: contentHash,
  fileNonce: crypto.randomBytes(32).toString('hex'),
  revisionType: 'file'
});

console.log('Notarization created:', notarization.verificationHash);

3. Blockchain Witness

Add a witness revision to secure the notarization on the blockchain:

const witness = await client.addWitness({
  previousVerificationHash: notarization.verificationHash,
  witnessNetwork: 'sepolia',
  witnessSmartContractAddress: '0x45f59310ADD88E6d23ca58A0Fa7A55BEE6d2a611'
});

console.log('Witness added:', witness.transactionHash);

Notarization Types

File Notarization

Notarize files and documents for integrity verification:

• Document verification for legal and business applications
• Intellectual property protection and timestamping
• Compliance and regulatory requirements
• Audit trails for data governance

Content Notarization

Notarize specific content or data structures:

• Database records and data integrity
• Configuration files and system state
• API responses and data consistency
• Log files and audit trails

Form Notarization

Special notarization for layer 2 applications:

• Identity claims and attestations
• Access control policies
• Selective disclosure capabilities
• Privacy-preserving verification

Verification Process

Once content is notarized, it can be verified at any time:

const verification = await client.verifyNotarization({
  verificationHash: notarization.verificationHash,
  expectedContent: content
});

if (verification.isValid) {
  console.log('Notarization verified successfully');
  console.log('Timestamp:', verification.timestamp);
  console.log('Block number:', verification.blockNumber);
} else {
  console.log('Notarization verification failed');
}

Use Cases

Legal Documents

• Contract verification and authenticity
• Legal compliance and regulatory requirements
• Evidence preservation for legal proceedings
• Notary services and document certification

Business Applications

• Supply chain verification and tracking
• Financial records and audit trails
• Compliance and regulatory reporting
• Data governance and integrity

Identity Management

• Identity verification and attestation
• Credential management and verification
• Access control and authorization
• Privacy-preserving identity solutions

Best Practices

Content Preparation

• Normalize content before hashing to ensure consistency
• Include metadata such as file names and timestamps
• Use appropriate nonces for additional entropy
• Validate content before notarization

Security Considerations

• Protect private keys used for signing
• Use secure networks for witness transactions
• Regular verification of notarized content
• Backup verification hashes for recovery

Performance Optimization

• Batch operations for multiple notarizations
• Use appropriate networks based on requirements
• Monitor gas costs for witness transactions
• Implement caching for frequent verifications