SilentLedger: Privacy-Preserving Auditing for Blockchains With Complete Non-Interactivity

SilentLedger is a blockchain system that protects transaction privacy while still allowing authorized auditors to identify participants and transaction amounts when needed, without requiring real-time communication between users and auditors. The system uses a renewable anonymous certificate scheme (a method for proving identity while staying anonymous) combined with encryption and digital signatures to let users create transactions independently, while auditors can recover audit data directly from the blockchain. The authors prove their system is secure and demonstrate it works efficiently in practice.