Privacy Policy

1. Introduction

QuantumEVM Marketplace ("we," "us," or "our") operates the marketplace at https://marketplace.quantumevm.com. This Privacy Policy explains how we collect, use, and protect your information when you use our platform.

2. Information We Collect

We collect minimal information necessary to operate the marketplace:

• Wallet address — your public blockchain address, used for authentication and transaction processing.
• Profile information — username, name, bio, and location that you voluntarily provide during registration.
• Transaction data — purchase records, listing details, and review content created through marketplace activity.
• Messages — content of private conversations between buyers and sellers.
• Uploaded files — product images, profile pictures, and shipping receipts you upload.

3. How We Use Your Information

• To facilitate marketplace transactions between buyers and sellers.
• To display your public profile and product listings to other users.
• To enable private messaging between transaction participants.
• To process escrow payments through smart contracts.
• To resolve disputes and enforce our Terms of Service.
• To improve marketplace functionality and user experience.

4. Data We Do NOT Collect or Sell

• We do not sell, share, or monetize your personal data.
• We do not use tracking cookies, advertising pixels, or behavioral analytics.
• We do not share data with third-party advertising networks.
• We do not collect data beyond what is necessary for marketplace functionality.

5. Cookies and Local Storage

We use only functional cookies and local storage required for the marketplace to operate. These include theme preferences (dark/light mode) and wallet connection state. We do not use any tracking or advertising cookies.

6. Blockchain Data

Transactions processed through smart contracts are recorded on a public blockchain. This data is immutable and publicly accessible by design. We cannot modify or delete on-chain data. Your wallet address and transaction history are publicly visible on the blockchain.

7. Data Storage and Security

Off-chain data (profiles, listings, messages) is stored in a secured database with row-level security policies. All API mutations require wallet signature authentication. File uploads are validated for type and size before storage.

8. Law Enforcement

We will cooperate with law enforcement agencies when presented with valid legal process. We may disclose user information if required by law or in response to lawful requests from public authorities.

9. Data Retention

We retain your data for as long as your account is active. If you wish to have your off-chain data removed, you may contact us. On-chain data cannot be removed due to the immutable nature of blockchain technology.

10. Changes to This Policy

We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated revision date. Continued use of the marketplace constitutes acceptance of the revised policy.

11. Contact

If you have questions about this Privacy Policy, please reach out through the marketplace messaging system or contact the marketplace administrator.