index.js

import express from 'express';
import cors from 'cors';
import * as  snarkjs from 'snarkjs';
import fs from 'fs';

const app = express();
app.use(cors());
app.use(express.json({ limit: '10mb' }));

app.post('/verify', async (req, res) => {
  try {
    const { zkProof, publicSignals, walletPublicKey } = req.body;

    console.log("Received ZK proof for verification");
    console.log("Wallet:", walletPublicKey);

    const vKey = JSON.parse(fs.readFileSync('verification_key.json', 'utf8'));
    
    console.log("Starting verification...");
    const startTime = Date.now();
    
    const isValid = await snarkjs.groth16.verify(vKey, publicSignals, zkProof);
    
    const endTime = Date.now();
    console.log(`Verification complete in ${endTime - startTime}ms:`, isValid);

    res.json({
      valid: isValid,
      wallet: walletPublicKey,
      verificationTime: endTime - startTime,
      message: isValid ? "ZK proof verified!" : "Invalid proof"
    });

  } catch (error) {
    console.error("Verification error:", error);
    res.status(500).json({ valid: false, error: error.message });
  }
});

app.listen(7860, () => {
  console.log('ZK Verification server running on 7860');
});