// anonymous_bidding.compact
circuit AnonymousBidding {
    private field bidAmount;
    private field userSecret;
    private field auctionId;
    public field minBid;
    public field maxBid;
    constraint bidAmount >= minBid;
    constraint bidAmount <= maxBid;
    constraint hash(userSecret) == publicCommitment;
}

// midnightIntegration.ts
import { MidnightJS } from '@midnight-ntwrk/midnight-js';
import { CompactCircuit } from '@midnight-ntwrk/compact';

export class AuctionVaultZK {
  private midnightClient: MidnightJS;

  async generateBidProof(bidData: BidData): Promise<ZKProof> {
    const circuit = await CompactCircuit.load('./circuits/anonymous_bidding.compact');
    const proof = await this.midnightClient.generateProof(circuit, {
      private: {
        bidAmount: bidData.amount,
        userSecret: bidData.userSecret,
        auctionId: bidData.auctionId
      },
      public: {
        minBid: bidData.minBid,
        maxBid: bidData.maxBid
      }
    });
    return proof;
  }
}

// Real-time auction engine with privacy preservation
export class PrivateAuctionEngine {
  async submitBid(auctionId: string, encryptedBid: EncryptedBid): Promise<BidResult> {
    const isValidProof = await this.verifyBidProof(encryptedBid.proof);
    if (isValidProof) {
      await this.updateAuctionState(auctionId, {
        bidCount: this.state.bidCount + 1,
        lastBidTime: Date.now(),
        highestBidCommitment: encryptedBid.commitment
      });
    }
    return { success: isValidProof, anonymous: true };
  }
}

// Secure payment processing with zero-knowledge proofs
export class CryptographicEscrow {
  async createEscrow(auctionId: string, bidProof: ZKProof): Promise<EscrowContract> {
    const escrowContract = await this.midnightClient.deployContract({
      circuit: './circuits/escrow_payment.compact',
      initialState: {
        auctionId,
        bidderCommitment: bidProof.publicOutputs.bidderCommitment,
        sellerCommitment: await this.getSellerCommitment(auctionId)
      }
    });
    return escrowContract;
  }
}

// Core bidding system preserves complete anonymity
interface AnonymousBid {
  zkProof: ZKProof;
  bidCommitment: string;
  auctionId: string;
  // Thông tin cá nhân không bao giờ được lưu trữ hoặc truyền
}

// Users authenticate without revealing identity
const anonymousIdentity = await zkAuth.createIdentity({
  userType: 'bidder',
  credential: 'financial_capacity',
  zkProof: await generateIdentityProof(credentials)
});

// All auction communications are end-to-end encrypted
const encryptedMessage = await encrypt(message, {
  recipientPublicKey: auction.sellerPublicKey,
  senderPrivateKey: user.anonymousPrivateKey,
});

// Auction state updates through private channels
const stateUpdate = await privateChannel.update({
  auctionId,
  newBidCommitment: hash(bidAmount + nonce),
  timestamp: Date.now()
});

// Payment processing without exposing financial details
export class PrivatePayments {
  async processPayment(escrowContract: EscrowContract): Promise<PaymentResult> {
    const paymentProof = await this.generatePaymentProof({
      paymentMethod: user.encryptedPaymentMethod,
      amount: escrowContract.lockedAmount,
      zkProof: await this.provePaymentCapacity(amount)
    });
    return await escrowContract.executePayment(paymentProof);
  }
}

# Required tools
node >= 18.0.0
npm >= 8.0.0
git

# Clone the repository
git clone https://github.com/your-username/auction-vault.git
cd auction-vault
npm install
npm install @midnight-ntwrk/midnight-js @midnight-ntwrk/compact

# Midnight Network Configuration
MIDNIGHT_RPC_URL=http://localhost:1337
MIDNIGHT_PROOF_SERVER_URL=http://localhost:8080
MIDNIGHT_INDEXER_URL=http://localhost:3001
NEXT_PUBLIC_APP_URL=http://localhost:3000
NEXT_PUBLIC_ENABLE_ZK_PROOFS=true
CIRCUIT_PATH_BIDDING=./circuits/anonymous_bidding.compact
CIRCUIT_PATH_VERIFICATION=./circuits/seller_verification.compact
CIRCUIT_PATH_ESCROW=./circuits/escrow_payment.compact

mkdir -p compiled/circuits
compact compile circuits/anonymous_bidding.compact -o compiled/circuits/
compact compile circuits/seller_verification.compact -o compiled/circuits/
compact compile circuits/escrow_payment.compact -o compiled/circuits/

docker-compose up -d

npm run dev

const testBid = async () => {
  const identity = await zkAuth.createIdentity({
    userType: 'bidder',
    credential: 'financial_capacity'
  });
  const bidProof = await auctionVault.generateBidProof({
    amount: 1000,
    auctionId: 'auction_123',
    userSecret: identity.secret
  });
  const result = await auctionVault.submitBid('auction_123', {
    zkProof: bidProof,
    commitment: hash(1000 + identity.nonce)
  });
  console.log('Bid submitted anonymously:', result.success);
};

npm run build
npm run deploy