How to Use GhostReceipt

Generate zero-knowledge payment receipts in 3 simple steps.

Step 1: Enter Transaction Details

• Chain: Select Bitcoin or Ethereum
• Transaction Hash: The on-chain transaction ID you want to prove
• Claimed Amount: Minimum amount to prove (in satoshis for Bitcoin, wei for Ethereum)
• Minimum Date: Earliest date the transaction could have occurred

Step 2: Generate Proof

Click "Generate Receipt" and wait while:

1. The oracle fetches canonical transaction data from the blockchain
2. Your browser validates the data against your claim
3. A zero-knowledge proof is generated locally (no data leaves your browser)

Step 3: Share Receipt

Once generated, you can:

• Copy Link: Share a verification URL with anyone
• Download QR: Save a QR code for offline sharing
• View Receipt: See the verified proof details

What Gets Proven?

The receipt proves:

• ✓ Transaction amount ≥ claimed amount
• ✓ Transaction timestamp ≥ minimum date
• ✓ Oracle signature is valid

What Stays Private?

The receipt does NOT reveal:

• ✗ Actual transaction amount (only proves minimum)
• ✗ Exact timestamp (only proves after date)
• ✗ Sender address
• ✗ Receiver address
• ✗ Transaction hash

Verification

Anyone with the receipt link can verify the proof cryptographically without seeing sensitive details.