Contactless Card Blockchain Data Sharing

The patent segments personal data into specific data elements (e.g., age, name, address) and enables selective sharing of only the required elements. The contactless card system divides data access control into multiple layers: data element level, transaction level, and merchant level, allowing precise control over what information is exposed during data sharing operations.

The patent introduces a blockchain-based intermediary system that mediates between the user's contactless card and the merchant. The blockchain stores encrypted data elements and verification records, acting as a trusted third party that enables privacy-preserving data sharing without requiring direct exposure of sensitive information. The verification service uses cryptographic keys to verify data authenticity without exposing the actual data elements.

The patent applies local quality by enabling different levels of data exposure for different merchants and different data elements. Each data element can be independently controlled and shared only with authorized merchants for specific purposes. The system allows fine-grained control where each data element has its own access permissions, verification rules, and exposure scope, ensuring that only the minimum necessary information is revealed for each transaction.

The patent replaces traditional mechanical data sharing methods (direct database access, manual verification) with cryptographic verification mechanisms. Digital signatures and public-key cryptography enable merchants to verify data authenticity without accessing the underlying personal information. The blockchain provides immutable verification records that ensure data reliability without requiring exposure of sensitive data elements.

The patent implements preliminary action by pre-configuring data element permissions, cryptographic keys, and verification rules in the blockchain before data sharing operations occur. Data elements are pre-encrypted and stored in the blockchain with associated access control metadata. When a transaction requires data verification, the system can quickly retrieve and verify pre-prepared cryptographic proofs without performing complex real-time encryption or access control checks, significantly improving processing efficiency.

The contactless card system enables self-service data sharing where the card automatically manages cryptographic operations, data element selection, and verification processes. The card's embedded security element handles key management, digital signature generation, and encrypted data transmission without requiring user intervention for each transaction. This automation reduces processing overhead and enables rapid privacy-preserving data sharing.