Privacy-Preserving “Right to Be Forgotten” in Configurable Blockchain Tokenization: A Cryptographic Audit Framework

Abstract

Blockchain tokenization ecosystems face significant challenges in complying with privacy regulations such as the General Data Protection Regulation (GDPR), particularly the “Right to Be Forgotten” mandate. The immutable nature of blockchain conflicts with the requirement for data deletion, creating a fundamental tension between technological capabilities and regulatory compliance. This paper presents a novel cryptographic audit framework for implementing GDPR-compliant data erasure in configurable tokenization systems. Our approach leverages cryptographic key destruction, zero-knowledge proofs for audit trails, and automated smart contract mechanisms to achieve practical data deletion while preserving blockchain immutability. The framework introduces a triple-layer architecture separating on-chain and off-chain references from off-chain sensitive data, enabling verifiable data erasure through cryptographic “shredding” techniques. We demonstrate the framework’s effectiveness through detailed algorithms and present a proof of concept comprehensive audit mechanism that generates cryptographic proofs of successful data deletion without revealing sensitive information. Our solution addresses critical gaps in current blockchain privacy implementations and provides a practical pathway for regulatory compliance in tokenization ecosystems.