AVENAZK VERIFICATION

Zero-Knowledge Buyer Verification

Prove you're a serious buyer without revealing your financial data. First zero-knowledge verification system in European property.

How It Works

1

Commit

Hash your budget with a secret salt. SHA-256(budget + salt) = commitment. Your actual budget never leaves your device.

2

Verify

Submit your commitment to Avena. We verify the format without seeing the underlying data. You prove you can afford the property.

3

Credential

Receive a W3C Verifiable Credential. Share it with developers. They see "verified buyer" without seeing your bank account.

Generate Your Commitment

# Generate commitment locally (never send your budget)
echo -n "350000:my-secret-salt-12345" | sha256sum

# Submit commitment to Avena
curl -X POST https://avenaterminal.com/api/zk/verify \
  -H "Content-Type: application/json" \
  -d '{
    "claim_type": "affordability",
    "commitment": "YOUR_SHA256_HASH_HERE",
    "public_inputs": { "property_ref": "AP1-CB-12345" }
  }'

Credential Types

Affordability

Proves budget exceeds property price without revealing amount

Serious Buyer

Verified by platform activity: property views, alerts set, engagement

PRO Member

Active Avena PRO subscription verified via Stripe

Identity

KYC completed without revealing personal documents to seller

W3C Verifiable Credentials

Credentials follow the W3C Verifiable Credentials standard, making them interoperable with any system that supports the spec.

{
  "@context": ["https://www.w3.org/2018/credentials/v1"],
  "type": ["VerifiableCredential", "AvenaBuyerCredential"],
  "issuer": "https://avenaterminal.com",
  "credentialSubject": {
    "id": "did:avena:buyer123",
    "buyerStatus": "verified",
    "priceRange": "€200k-€400k",
    "verificationMethod": "zero-knowledge-commitment"
  }
}

Avena Terminal. First zero-knowledge buyer verification in European property.

avenaterminal.com/zk · DOI: 10.5281/zenodo.19520064