verifyProof

Verifies the cryptographic zero-knowledge proof embedded in the C2PA manifest. Checks the validity and integrity of the ZK proof.

Usage

import { VerifiableFile } from '@succinctlabs/react-native-zcam1';
 
const verifiable = new VerifiableFile(photoPath);
const appId = process.env.EXPO_PUBLIC_APP_ID!;
 
const isValid = verifiable.verifyProof(appId);

Parameters

appId (required)

Type: string

The app identifier used during initCapture().

iOS: TEAM_ID.BUNDLE_ID (e.g., 'NLS5R4YCGX.com.example.myapp')
Android: The app package name (e.g., 'com.example.myapp')

Returns

boolean - true if the proof is valid, false otherwise.

Throws

Throws an error if the manifest doesn't contain a succinct.proof assertion

Example

import { useState } from 'react';
import { Button, Text, View, StyleSheet } from 'react-native';
import { VerifiableFile } from '@succinctlabs/react-native-zcam1';
import { launchImageLibrary } from 'react-native-image-picker';
 
function ProofVerificationScreen() {
  const [result, setResult] = useState<string>('');
 
  const verifyProof = async () => {
    const response = await launchImageLibrary({ mediaType: 'photo' });
    const uri = response.assets?.[0]?.uri;
    
    if (!uri) return;
 
    try {
      const verifiable = new VerifiableFile(uri);
      const appId = process.env.EXPO_PUBLIC_APP_ID!;
      const isValid = verifiable.verifyProof(appId);
      
      if (isValid) {
        setResult('✓ Zero-knowledge proof verified!');
      } else {
        setResult('✗ Proof verification failed');
      }
    } catch (error: any) {
      setResult(`Error: ${error.message}`);
    }
  };
 
  return (
    <View style={styles.container}>
      <Button title="Verify Proof" onPress={verifyProof} />
      {result && <Text style={styles.result}>{result}</Text>}
    </View>
  );
}

Notes

Requires the photo to have been proven using the Prove SDK
The appId parameter must match the value used during initCapture()
Verifies the Groth16 proof using the embedded verification key hash
Public inputs include the photo hash, app ID, and Apple root certificate