A Privacy-Preserving Enforced Bill Collection System Using Smart Contracts

A Privacy-Preserving Enforced Bill Collection System Using Smart Contracts

Prof. Umar Mulani, Diksha Shinde, Kadam Ankita, Sameera Gaikwad, Sanket Abnave

Department of Computer Engineering,

K J College of Engineering and Management Research, Pune( India)

Abstract - The paper presents a privacy- preserving enforced bill collection system that ensures both user anonymity and accountability using smart contracts and accountable ring signatures. The system extends the existing Isshiki system, which allows users to anonymously access services, by introducing an enforcement mechanism that guarantees payment via pre-deposited funds. If a user ignores the invoice, the smart contract automatically transfers the deposit to the bill collector, ensuring fair compensation. The proposed system is designed for decentralized blockchain environments, specifically using Ethereum smart contracts to enforce payment while maintaining privacy. The solution is efficient, reducing gas costs by leveraging elliptic curve digital signatures (ECDSA).

Keywords - Privacy-preserving, smart contracts, accountable ring signatures, enforced bill collection, Ethereum, anonymity, traceability.