> ## Documentation Index
> Fetch the complete documentation index at: https://aquaprotocol.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Identity Attestation

> Use Aqua Protocol for secure identity verification and credential attestation

# Identity Attestation

Aqua Protocol provides comprehensive identity attestation capabilities that enable secure, privacy-preserving verification of identities and credentials without relying on centralized authorities.

## Overview

Identity attestation with Aqua Protocol enables:

* **Decentralized identity verification** without centralized authorities
* **Privacy-preserving attestation** with selective disclosure
* **Cryptographic proof** of identity and credential authenticity
* **Cross-platform compatibility** and portability
* **Audit trails** for compliance and verification

## Use Cases

### Digital Identity

* **Government e-identity** and digital citizenship
* **Healthcare patient** identity verification
* **Financial services** KYC and compliance
* **Education** student identity and credentials

### Professional Credentials

* **Professional certifications** and licenses
* **Employment verification** and references
* **Skills assessment** and portfolios
* **Continuing education** credits and certificates

### Access Control

* **Building access** and security systems
* **Digital services** and subscription management
* **Content access** and permission management
* **API access** and rate limiting

### Compliance and Regulation

* **Regulatory compliance** and reporting
* **Audit trails** and verification
* **Data protection** and privacy compliance
* **Cross-border** identity verification

## Implementation Examples

### Basic Identity Attestation

```javascript theme={null}
import { AquaClient } from '@aqua-protocol/sdk';

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

// Create identity attestation
const createIdentityAttestation = async (identityData) => {
  const attestation = {
    subject: identityData.identityHash,
    issuer: identityData.issuer,
    claim: {
      type: 'identity_verification',
      name: identityData.name,
      email: identityData.email,
      dateOfBirth: identityData.dateOfBirth,
      nationality: identityData.nationality
    },
    timestamp: new Date().toISOString()
  };
  
  const notarization = await client.notarize({
    content: JSON.stringify(attestation),
    metadata: {
      type: 'identity_attestation',
      subject: identityData.identityHash,
      issuer: identityData.issuer
    }
  });
  
  return notarization.verificationHash;
};

// Verify identity attestation
const verifyIdentityAttestation = async (attestationHash, expectedData) => {
  const verification = await client.verify({
    verificationHash: attestationHash,
    content: JSON.stringify(expectedData)
  });
  
  return {
    isValid: verification.isValid,
    timestamp: verification.timestamp,
    blockNumber: verification.blockNumber
  };
};
```

### Educational Credential Attestation

```javascript theme={null}
// Educational credential attestation
const createEducationalAttestation = async (credentialData) => {
  const attestation = {
    subject: credentialData.identityHash,
    issuer: credentialData.institution,
    claim: {
      type: 'educational_credential',
      degree: credentialData.degree,
      field: credentialData.field,
      institution: credentialData.institution,
      graduationDate: credentialData.graduationDate,
      gpa: credentialData.gpa
    },
    timestamp: new Date().toISOString()
  };
  
  const notarization = await client.notarize({
    content: JSON.stringify(attestation),
    metadata: {
      type: 'educational_attestation',
      subject: credentialData.identityHash,
      institution: credentialData.institution,
      degree: credentialData.degree
    }
  });
  
  return notarization.verificationHash;
};

// Verify educational credential
const verifyEducationalCredential = async (attestationHash, expectedData) => {
  const verification = await client.verify({
    verificationHash: attestationHash,
    content: JSON.stringify(expectedData)
  });
  
  return {
    isValid: verification.isValid,
    degree: expectedData.degree,
    institution: expectedData.institution,
    graduationDate: expectedData.graduationDate
  };
};
```

### Professional Certification Attestation

```javascript theme={null}
// Professional certification attestation
const createProfessionalAttestation = async (certificationData) => {
  const attestation = {
    subject: certificationData.identityHash,
    issuer: certificationData.organization,
    claim: {
      type: 'professional_certification',
      certification: certificationData.certification,
      organization: certificationData.organization,
      issuedDate: certificationData.issuedDate,
      expiryDate: certificationData.expiryDate,
      level: certificationData.level
    },
    timestamp: new Date().toISOString()
  };
  
  const notarization = await client.notarize({
    content: JSON.stringify(attestation),
    metadata: {
      type: 'professional_attestation',
      subject: certificationData.identityHash,
      organization: certificationData.organization,
      certification: certificationData.certification
    }
  });
  
  return notarization.verificationHash;
};

// Verify professional certification
const verifyProfessionalCertification = async (attestationHash, expectedData) => {
  const verification = await client.verify({
    verificationHash: attestationHash,
    content: JSON.stringify(expectedData)
  });
  
  return {
    isValid: verification.isValid,
    certification: expectedData.certification,
    organization: expectedData.organization,
    issuedDate: expectedData.issuedDate,
    expiryDate: expectedData.expiryDate,
    isExpired: new Date() > new Date(expectedData.expiryDate)
  };
};
```

## Advanced Features

### Selective Disclosure

```javascript theme={null}
// Selective disclosure for privacy
const createSelectiveAttestation = async (attestationData) => {
  const attestation = {
    subject: attestationData.identityHash,
    issuer: attestationData.issuer,
    claim: {
      type: 'selective_attestation',
      name: attestationData.name,
      email: attestationData.email,
      dateOfBirth: attestationData.dateOfBirth,
      ssn: attestationData.ssn,
      address: attestationData.address
    },
    timestamp: new Date().toISOString()
  };
  
  const notarization = await client.notarize({
    content: JSON.stringify(attestation),
    metadata: {
      type: 'selective_attestation',
      subject: attestationData.identityHash
    },
    options: {
      hashingMethod: 'tree' // Enable selective disclosure
    }
  });
  
  return notarization.verificationHash;
};

// Verify with selective disclosure
const verifySelectiveAttestation = async (attestationHash, disclosedFields) => {
  const verification = await client.verifySelective({
    verificationHash: attestationHash,
    disclosedFields: disclosedFields,
    verifier: '0xverifier123...'
  });
  
  return verification;
};
```

### Multi-Factor Attestation

```javascript theme={null}
// Multi-factor attestation
const createMultiFactorAttestation = async (attestationData) => {
  const attestation = {
    subject: attestationData.identityHash,
    issuer: attestationData.issuer,
    claim: {
      type: 'multi_factor_attestation',
      factors: [
        {
          type: 'government_id',
          verified: true,
          method: 'document_scan'
        },
        {
          type: 'biometric',
          verified: true,
          method: 'fingerprint'
        },
        {
          type: 'phone_verification',
          verified: true,
          method: 'sms'
        }
      ]
    },
    timestamp: new Date().toISOString()
  };
  
  const notarization = await client.notarize({
    content: JSON.stringify(attestation),
    metadata: {
      type: 'multi_factor_attestation',
      subject: attestationData.identityHash,
      factors: attestationData.factors.length
    }
  });
  
  return notarization.verificationHash;
};
```

### Attestation Chains

```javascript theme={null}
// Attestation chain verification
const createAttestationChain = async (attestations) => {
  const chain = [];
  
  for (let i = 0; i < attestations.length; i++) {
    const attestation = attestations[i];
    const previousHash = i > 0 ? chain[i - 1].verificationHash : null;
    
    const notarization = await client.notarize({
      content: JSON.stringify(attestation),
      metadata: {
        type: 'attestation_chain',
        subject: attestation.subject,
        issuer: attestation.issuer,
        chainIndex: i,
        previousHash: previousHash
      }
    });
    
    chain.push({
      ...attestation,
      verificationHash: notarization.verificationHash,
      previousHash: previousHash
    });
  }
  
  return chain;
};

// Verify attestation chain
const verifyAttestationChain = async (chain) => {
  const verificationResults = [];
  
  for (let i = 0; i < chain.length; i++) {
    const attestation = chain[i];
    const verification = await client.verify({
      verificationHash: attestation.verificationHash,
      content: JSON.stringify(attestation)
    });
    
    verificationResults.push({
      index: i,
      verification,
      isValid: verification.isValid
    });
  }
  
  return verificationResults;
};
```

## Industry-Specific Implementations

### Healthcare Identity Attestation

```javascript theme={null}
// Healthcare identity attestation
class HealthcareIdentityAttestation {
  constructor(aquaClient) {
    this.client = aquaClient;
  }

  async createPatientIdentity(patientData) {
    const attestation = {
      subject: patientData.identityHash,
      issuer: patientData.healthcareProvider,
      claim: {
        type: 'patient_identity',
        patientId: patientData.patientId,
        name: patientData.name,
        dateOfBirth: patientData.dateOfBirth,
        medicalRecordNumber: patientData.medicalRecordNumber,
        insuranceNumber: patientData.insuranceNumber
      },
      timestamp: new Date().toISOString()
    };
    
    const notarization = await this.client.notarize({
      content: JSON.stringify(attestation),
      metadata: {
        type: 'patient_identity',
        subject: patientData.identityHash,
        healthcareProvider: patientData.healthcareProvider
      }
    });
    
    return notarization.verificationHash;
  }

  async createMedicalLicense(licenseData) {
    const attestation = {
      subject: licenseData.identityHash,
      issuer: licenseData.medicalBoard,
      claim: {
        type: 'medical_license',
        licenseNumber: licenseData.licenseNumber,
        specialty: licenseData.specialty,
        issuedDate: licenseData.issuedDate,
        expiryDate: licenseData.expiryDate,
        status: licenseData.status
      },
      timestamp: new Date().toISOString()
    };
    
    const notarization = await this.client.notarize({
      content: JSON.stringify(attestation),
      metadata: {
        type: 'medical_license',
        subject: licenseData.identityHash,
        medicalBoard: licenseData.medicalBoard
      }
    });
    
    return notarization.verificationHash;
  }
}
```

### Financial Services Identity Attestation

```javascript theme={null}
// Financial services identity attestation
class FinancialIdentityAttestation {
  constructor(aquaClient) {
    this.client = aquaClient;
  }

  async createKYCAttestation(kycData) {
    const attestation = {
      subject: kycData.identityHash,
      issuer: kycData.financialInstitution,
      claim: {
        type: 'kyc_verification',
        name: kycData.name,
        dateOfBirth: kycData.dateOfBirth,
        address: kycData.address,
        idType: kycData.idType,
        idNumber: kycData.idNumber,
        riskLevel: kycData.riskLevel
      },
      timestamp: new Date().toISOString()
    };
    
    const notarization = await this.client.notarize({
      content: JSON.stringify(attestation),
      metadata: {
        type: 'kyc_verification',
        subject: kycData.identityHash,
        financialInstitution: kycData.financialInstitution
      }
    });
    
    return notarization.verificationHash;
  }

  async createCreditScoreAttestation(creditData) {
    const attestation = {
      subject: creditData.identityHash,
      issuer: creditData.creditBureau,
      claim: {
        type: 'credit_score',
        score: creditData.score,
        range: creditData.range,
        factors: creditData.factors,
        reportDate: creditData.reportDate
      },
      timestamp: new Date().toISOString()
    };
    
    const notarization = await this.client.notarize({
      content: JSON.stringify(attestation),
      metadata: {
        type: 'credit_score',
        subject: creditData.identityHash,
        creditBureau: creditData.creditBureau
      }
    });
    
    return notarization.verificationHash;
  }
}
```

### Education Identity Attestation

```javascript theme={null}
// Education identity attestation
class EducationIdentityAttestation {
  constructor(aquaClient) {
    this.client = aquaClient;
  }

  async createStudentIdentity(studentData) {
    const attestation = {
      subject: studentData.identityHash,
      issuer: studentData.institution,
      claim: {
        type: 'student_identity',
        studentId: studentData.studentId,
        name: studentData.name,
        program: studentData.program,
        enrollmentDate: studentData.enrollmentDate,
        status: studentData.status
      },
      timestamp: new Date().toISOString()
    };
    
    const notarization = await this.client.notarize({
      content: JSON.stringify(attestation),
      metadata: {
        type: 'student_identity',
        subject: studentData.identityHash,
        institution: studentData.institution
      }
    });
    
    return notarization.verificationHash;
  }

  async createTranscriptAttestation(transcriptData) {
    const attestation = {
      subject: transcriptData.identityHash,
      issuer: transcriptData.institution,
      claim: {
        type: 'transcript',
        studentId: transcriptData.studentId,
        courses: transcriptData.courses,
        gpa: transcriptData.gpa,
        degree: transcriptData.degree,
        graduationDate: transcriptData.graduationDate
      },
      timestamp: new Date().toISOString()
    };
    
    const notarization = await this.client.notarize({
      content: JSON.stringify(attestation),
      metadata: {
        type: 'transcript',
        subject: transcriptData.identityHash,
        institution: transcriptData.institution
      }
    });
    
    return notarization.verificationHash;
  }
}
```

## Integration Patterns

### API Integration

```javascript theme={null}
// Express.js API for identity attestation
const express = require('express');
const { AquaClient } = require('@aqua-protocol/sdk');

const app = express();
const client = new AquaClient({
  apiKey: process.env.AQUA_API_KEY,
  endpoint: process.env.AQUA_ENDPOINT
});

// Create attestation endpoint
app.post('/api/attestations', async (req, res) => {
  try {
    const { subject, issuer, claim } = req.body;
    
    const attestation = {
      subject,
      issuer,
      claim,
      timestamp: new Date().toISOString()
    };
    
    const notarization = await client.notarize({
      content: JSON.stringify(attestation),
      metadata: {
        type: 'identity_attestation',
        subject: subject,
        issuer: issuer
      }
    });
    
    res.json({
      success: true,
      verificationHash: notarization.verificationHash
    });
  } catch (error) {
    res.status(500).json({
      error: error.message
    });
  }
});

// Verify attestation endpoint
app.post('/api/attestations/verify', async (req, res) => {
  try {
    const { verificationHash, expectedData } = req.body;
    
    const verification = await client.verify({
      verificationHash,
      content: JSON.stringify(expectedData)
    });
    
    res.json({
      isValid: verification.isValid,
      timestamp: verification.timestamp
    });
  } catch (error) {
    res.status(500).json({
      error: error.message
    });
  }
});
```

### Database Integration

```javascript theme={null}
// MongoDB integration for identity attestation
const mongoose = require('mongoose');
const { AquaClient } = require('@aqua-protocol/sdk');

const AttestationSchema = new mongoose.Schema({
  subject: String,
  issuer: String,
  claim: Object,
  verificationHash: String,
  createdAt: { type: Date, default: Date.now }
});

const Attestation = mongoose.model('Attestation', AttestationSchema);

class IdentityAttestationService {
  constructor(aquaClient) {
    this.client = aquaClient;
  }

  async createAttestation(attestationData) {
    const attestation = {
      subject: attestationData.subject,
      issuer: attestationData.issuer,
      claim: attestationData.claim,
      timestamp: new Date().toISOString()
    };
    
    const notarization = await this.client.notarize({
      content: JSON.stringify(attestation),
      metadata: {
        type: 'identity_attestation',
        subject: attestationData.subject,
        issuer: attestationData.issuer
      }
    });
    
    const dbAttestation = new Attestation({
      subject: attestationData.subject,
      issuer: attestationData.issuer,
      claim: attestationData.claim,
      verificationHash: notarization.verificationHash
    });
    
    await dbAttestation.save();
    return dbAttestation;
  }

  async verifyAttestation(verificationHash) {
    const attestation = await Attestation.findOne({ verificationHash });
    if (!attestation) {
      throw new Error('Attestation not found');
    }
    
    const verification = await this.client.verify({
      verificationHash: attestation.verificationHash,
      content: JSON.stringify({
        subject: attestation.subject,
        issuer: attestation.issuer,
        claim: attestation.claim
      })
    });
    
    return {
      attestation,
      verification
    };
  }
}
```

## Best Practices

### Privacy and Security

* **Implement selective disclosure** for sensitive information
* **Use encryption** for sensitive data
* **Implement access control** for attestation data
* **Regular security audits** and updates

### Performance

* **Cache verification results** for frequently accessed attestations
* **Use batch operations** for multiple attestations
* **Implement rate limiting** for API endpoints
* **Monitor performance** and optimize as needed

### Compliance

* **Maintain audit trails** for all operations
* **Implement data retention** policies
* **Ensure regulatory compliance** for your industry
* **Regular compliance reviews** and updates

### User Experience

* **Simplify attestation** creation process
* **Provide clear verification** status
* **Enable easy sharing** of attestations
* **Support multiple** verification methods


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