dbis_core/docs/volume-vii/zk-cbdc.md

ZK-CBDC Validation Framework

Overview

Zero-Knowledge CBDC Validation ensures privacy-preserving compliance by enabling:

• Balance verification without revealing balances
• Transaction compliance without revealing transaction history
• ZK-enabled AML and sanctions screening

ZK Validation Modes

Mode 1 – ZK-Balance Proofs (zkBP)

Proves wallet has sufficient funds without revealing amount.

Service: zk-balance-proof.service.ts

API Endpoint: POST /api/v1/zk-cbdc/balance-proof

Mode 2 – ZK-Compliance Proofs (zkCP)

Ensures:

• AML rules satisfied
• Sanctions clear
• Transaction within policy limits

Service: zk-compliance-proof.service.ts

API Endpoint: POST /api/v1/zk-cbdc/compliance-proof

Mode 3 – ZK-Identity Proofs (zkIP)

Provides confirmation that:

• A wallet belongs to a verified entity
• Without disclosing identity attributes

Service: zk-identity-proof.service.ts

API Endpoint: POST /api/v1/zk-cbdc/identity-proof

Smart Contract Verification

Smart contracts validate:

if zkBP && zkCP && zkIP:
    execute_CBDC_transfer()

Service: zk-verification.service.ts

API Endpoint: POST /api/v1/zk-cbdc/verify

Database Models

• ZkProof - ZK proof records
• ZkVerification - Verification results

Integration Points

• CBDC transaction service (existing)
• GBIG identity graph (Volume V)
• AML engine (existing)

Note

ZK proof library integration required (e.g., circom, snarkjs, or similar). Current implementation uses placeholder proofs for structure.