ZK Email Stamp

The ZK Email Stamp verifies your Amazon and Uber activity through zero-knowledge email analysis, proving real-world purchasing and usage patterns without exposing your email content.

Quick Facts

Amazon Credentials

Uber Credentials

Requirements

• A Gmail account (Outlook support is coming soon)
• Amazon order confirmation emails and/or Uber ride confirmation emails in your Gmail inbox

Step-by-Step Verification

1. Navigate to the Passport App and connect your wallet.
2. Select the ZK Email Stamp.
3. Connect your Gmail account through the verification flow.
4. The system will analyze your emails using zero-knowledge proofs to count qualifying Amazon and Uber activity.
5. Based on your activity levels, you will receive the appropriate credentials.
6. The stamp will be added to your Passport.

Privacy and Security

• No email content is viewed or stored — The zero-knowledge analysis only counts qualifying confirmation emails without reading their content.
• Only counts are verified — The system proves you have a certain number of qualifying emails without revealing any details about your purchases or rides.
• Gmail only — Currently, only Gmail accounts are supported. Outlook support is planned for the future.

Supported Amazon Domains

The ZK Email Stamp supports order confirmation emails from 14 Amazon domains, including regional variants such as amazon.com, amazon.co.uk, amazon.de, amazon.fr, and others.

Troubleshooting

• Emails not detected — Ensure your Amazon/Uber confirmation emails are in your Gmail inbox (not deleted or archived).
• Outlook not supported — Currently only Gmail is supported. Outlook support is coming soon.
• Lower credential than expected — Only order/ride confirmation emails are counted. Other emails from Amazon or Uber (promotions, updates) do not qualify.
• Gmail authorization failed — Try clearing browser cookies or using an incognito window, then re-authorize.