Decentralized Identity Credentials for Private CBDC Compliance
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Solution Overview
Problem
Existing CBDC systems face challenges in balancing transaction security, regulatory compliance, and user privacy, with centralized identity verification systems being vulnerable to data breaches and lacking interoperability, while traditional blockchain technologies expose sensitive transaction details publicly.
Innovation Solution
Integrate Distributed Identity (DID) and Privacy-Enhancing Technologies (PET) to enable secure, private, and compliant financial transactions on a blockchain network, using decentralized identity management, cryptographic methods, and smart contracts to verify identities and enforce compliance without exposing personal information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centralized identity verification systems are used, then regulatory compliance is improved, but user privacy deteriorates and security becomes vulnerable to data breaches
Solution Approach 1:
The patent introduces verifiable credentials as an intermediary mechanism between users and financial institutions. These credentials contain encrypted user information that can be verified by institutions without decrypting or exposing the actual user data, thus enabling compliance verification while preserving privacy. The credential structure allows selective disclosure of only necessary information for compliance checks.
Solution Approach 2:
The patent replaces centralized mechanical identity verification systems with a cryptographic-based distributed identity system. Instead of centralized databases that store user information, the system uses cryptographic proofs (verifiable credentials) that can be verified without accessing central storage, eliminating the single point of failure and reducing privacy risks associated with centralized data storage.
2Reliability
If traditional blockchain technologies are used, then transaction transparency is improved, but user privacy deteriorates due to public exposure of transaction details
Solution Approach 1:
The patent applies local quality by differentiating the visibility requirements for different types of data. Transaction metadata (addresses, timestamps) remains transparent on the blockchain for accountability, while sensitive transaction details (amounts, counterparty identities) are encrypted using verifiable credentials that are only visible to authorized parties. This creates a multi-layered transparency model where different data have different visibility characteristics.
Solution Approach 2:
The patent uses verifiable credentials as an intermediary layer between the public blockchain and transaction participants. The credentials enable participants to verify transaction authenticity without exposing sensitive details to the public or even to all network nodes, thus maintaining both transparency for accountability and privacy for sensitive information.
3Object-affected harmful factors
If decentralized identity management is implemented, then user privacy is improved, but system complexity increases due to integration requirements
Solution Approach 1:
The patent designs verifiable credentials to serve multiple functions simultaneously: they provide user authentication, enable compliance verification, facilitate transaction privacy, and maintain interoperability between different financial institutions. This multi-functionality reduces the need for separate systems and simplifies the overall architecture despite the advanced cryptographic techniques involved.
Solution Approach 2:
The patent uses standardized credential formats and protocols that can be copied and exchanged between different systems. The verifiable credential structure acts as a universal copy that can be validated by multiple financial institutions without requiring direct system integration between each institution, thus reducing integration complexity while maintaining privacy benefits.
4Reliability
If multiple financial institutions require separate identity verifications, then regulatory compliance is improved, but ease of operation deteriorates due to repeated data provision
Solution Approach 1:
The patent creates a universal verifiable credential that can be presented to multiple financial institutions simultaneously. This single credential contains all necessary identity information and compliance data, allowing users to access multiple services without repeating the identity verification process, thus improving ease of operation while maintaining compliance through the structured credential format.
Solution Approach 2:
The patent performs identity verification and compliance checks in advance during credential issuance. Once the verifiable credential is created, it contains pre-verified identity attributes and compliance information, allowing users to access services without undergoing repeated verification processes, thus improving user convenience while ensuring ongoing regulatory compliance.
Data Source
AI summary
This disclosure provides techniques to utilize decentralized identifiers (DIDs) and verifiable credentials for secure, privacy-preserving transactions. In one aspect, a method is provided that includes: receiving user information; determining a DID based on the information; providing the DID to a user device; verifying the user's identity by validating the DID and associated verifiable credentials; and performing a transaction based on the verified DID. Other aspects are provided, such as generating a public-private key pair for the user, associating the DID with the public key, and/or creating a DID document stored on a distributed ledger accessible to authorized entities. Further aspects include processing transactions through smart contracts on a blockchain network, which may involve converting central bank digital currency to fiat currency while maintaining user privacy, applying transaction limits based on verified identity attributes, and providing zero-knowledge proofs to auditors to verify compliance without accessing underlying transaction details.